PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Security;
    
    namespace EncryptPDF
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument pdf = new PdfDocument();
    
                //Load a sample PDF file
                pdf.LoadFromFile(@"E:\Files\sample.pdf");
    
                //Encrypt the PDF file with password
                pdf.Security.Encrypt("open", "permission", PdfPermissionsFlags.Print | PdfPermissionsFlags.CopyContent, PdfEncryptionKeySize.Key128Bit);
    
                //Save the result file
                pdf.SaveToFile("Encrypt.pdf", FileFormat.PDF);
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    
    Namespace EncryptPDF
        Class Program
            Private Shared Sub Main(ByVal args As String())
    
                'Create a PdfDocument object
                Dim pdf As PdfDocument = New PdfDocument()
    
                'Load a sample PDF file
                pdf.LoadFromFile("E:\Files\sample.pdf")
    
                'Encrypt the PDF file with password
                pdf.Security.Encrypt("open", "permission", PdfPermissionsFlags.Print Or PdfPermissionsFlags.CopyContent, PdfEncryptionKeySize.Key128Bit)
    
                'Save the result file
                pdf.SaveToFile("Encrypt.pdf", FileFormat.PDF)
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Security;
    
    namespace DecryptPDF
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument pdf = new PdfDocument();
    
                //Load the encrypted PDF file with password
                pdf.LoadFromFile("Encrypt.pdf", "open");
    
                //Set the password as empty to decrypt PDF
                pdf.Security.Encrypt(string.Empty, string.Empty, PdfPermissionsFlags.Default, PdfEncryptionKeySize.Key128Bit, "permission");
    
                //Save the result file
                pdf.SaveToFile("Decrypt.pdf", FileFormat.PDF);
            }
        }
    } 

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    
    Namespace DecryptPDF
        Class Program
            Private Shared Sub Main(ByVal args As String())
    
                'Create a PdfDocument object
                Dim pdf As PdfDocument = New PdfDocument()
    
                'Load the encrypted PDF file with password
                pdf.LoadFromFile("Encrypt.pdf", "open")
    
                'Set the password as empty to decrypt PDF
                pdf.Security.Encrypt(String.Empty, String.Empty, PdfPermissionsFlags.[Default], PdfEncryptionKeySize.Key128Bit, "permission")
    
                'Save the result file
                pdf.SaveToFile("Decrypt.pdf", FileFormat.PDF)
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Security;
    
    namespace EncryptPDF
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument pdf = new PdfDocument();
    
                //Load a sample PDF file
                pdf.LoadFromFile(@"E:\Files\sample.pdf");
    
                //Encrypt the PDF file with password
                pdf.Security.Encrypt("open", "permission", PdfPermissionsFlags.Print | PdfPermissionsFlags.CopyContent, PdfEncryptionKeySize.Key128Bit);
    
                //Save the result file
                pdf.SaveToFile("Encrypt.pdf", FileFormat.PDF);
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    
    Namespace EncryptPDF
        Class Program
            Private Shared Sub Main(ByVal args As String())
    
                'Create a PdfDocument object
                Dim pdf As PdfDocument = New PdfDocument()
    
                'Load a sample PDF file
                pdf.LoadFromFile("E:\Files\sample.pdf")
    
                'Encrypt the PDF file with password
                pdf.Security.Encrypt("open", "permission", PdfPermissionsFlags.Print Or PdfPermissionsFlags.CopyContent, PdfEncryptionKeySize.Key128Bit)
    
                'Save the result file
                pdf.SaveToFile("Encrypt.pdf", FileFormat.PDF)
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Security;
    
    namespace DecryptPDF
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument pdf = new PdfDocument();
    
                //Load the encrypted PDF file with password
                pdf.LoadFromFile("Encrypt.pdf", "open");
    
                //Set the password as empty to decrypt PDF
                pdf.Security.Encrypt(string.Empty, string.Empty, PdfPermissionsFlags.Default, PdfEncryptionKeySize.Key128Bit, "permission");
    
                //Save the result file
                pdf.SaveToFile("Decrypt.pdf", FileFormat.PDF);
            }
        }
    } 

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    
    Namespace DecryptPDF
        Class Program
            Private Shared Sub Main(ByVal args As String())
    
                'Create a PdfDocument object
                Dim pdf As PdfDocument = New PdfDocument()
    
                'Load the encrypted PDF file with password
                pdf.LoadFromFile("Encrypt.pdf", "open")
    
                'Set the password as empty to decrypt PDF
                pdf.Security.Encrypt(String.Empty, String.Empty, PdfPermissionsFlags.[Default], PdfEncryptionKeySize.Key128Bit, "permission")
    
                'Save the result file
                pdf.SaveToFile("Decrypt.pdf", FileFormat.PDF)
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Security;
    
    namespace EncryptPDF
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument pdf = new PdfDocument();
    
                //Load a sample PDF file
                pdf.LoadFromFile(@"E:\Files\sample.pdf");
    
                //Encrypt the PDF file with password
                pdf.Security.Encrypt("open", "permission", PdfPermissionsFlags.Print | PdfPermissionsFlags.CopyContent, PdfEncryptionKeySize.Key128Bit);
    
                //Save the result file
                pdf.SaveToFile("Encrypt.pdf", FileFormat.PDF);
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    
    Namespace EncryptPDF
        Class Program
            Private Shared Sub Main(ByVal args As String())
    
                'Create a PdfDocument object
                Dim pdf As PdfDocument = New PdfDocument()
    
                'Load a sample PDF file
                pdf.LoadFromFile("E:\Files\sample.pdf")
    
                'Encrypt the PDF file with password
                pdf.Security.Encrypt("open", "permission", PdfPermissionsFlags.Print Or PdfPermissionsFlags.CopyContent, PdfEncryptionKeySize.Key128Bit)
    
                'Save the result file
                pdf.SaveToFile("Encrypt.pdf", FileFormat.PDF)
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Security;
    
    namespace DecryptPDF
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument pdf = new PdfDocument();
    
                //Load the encrypted PDF file with password
                pdf.LoadFromFile("Encrypt.pdf", "open");
    
                //Set the password as empty to decrypt PDF
                pdf.Security.Encrypt(string.Empty, string.Empty, PdfPermissionsFlags.Default, PdfEncryptionKeySize.Key128Bit, "permission");
    
                //Save the result file
                pdf.SaveToFile("Decrypt.pdf", FileFormat.PDF);
            }
        }
    } 

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    
    Namespace DecryptPDF
        Class Program
            Private Shared Sub Main(ByVal args As String())
    
                'Create a PdfDocument object
                Dim pdf As PdfDocument = New PdfDocument()
    
                'Load the encrypted PDF file with password
                pdf.LoadFromFile("Encrypt.pdf", "open")
    
                'Set the password as empty to decrypt PDF
                pdf.Security.Encrypt(String.Empty, String.Empty, PdfPermissionsFlags.[Default], PdfEncryptionKeySize.Key128Bit, "permission")
    
                'Save the result file
                pdf.SaveToFile("Decrypt.pdf", FileFormat.PDF)
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count-1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 340, 150, 290, 100);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS",12f,FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count-1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 340,150,290,100)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS",12f,FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Graphics;
    using Spire.Pdf.Security;
    using System.Drawing;
    
    namespace AddImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 200, 150, 130, 130);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly;
    
                //Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("ImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Graphics
    Imports Spire.Pdf.Security
    Imports System.Drawing
    
    Namespace AddImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 200,150,130,130)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly
    
                'Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("ImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextAndImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 320, 150, 260, 110);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextAndImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextAndImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 320,150,260,110)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextAndImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count-1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 340, 150, 290, 100);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS",12f,FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count-1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 340,150,290,100)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS",12f,FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Graphics;
    using Spire.Pdf.Security;
    using System.Drawing;
    
    namespace AddImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 200, 150, 130, 130);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly;
    
                //Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("ImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Graphics
    Imports Spire.Pdf.Security
    Imports System.Drawing
    
    Namespace AddImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 200,150,130,130)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly
    
                'Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("ImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextAndImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 320, 150, 260, 110);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextAndImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextAndImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 320,150,260,110)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextAndImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count-1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 340, 150, 290, 100);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS",12f,FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count-1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 340,150,290,100)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS",12f,FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Graphics;
    using Spire.Pdf.Security;
    using System.Drawing;
    
    namespace AddImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 200, 150, 130, 130);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly;
    
                //Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("ImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Graphics
    Imports Spire.Pdf.Security
    Imports System.Drawing
    
    Namespace AddImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 200,150,130,130)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly
    
                'Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("ImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextAndImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 320, 150, 260, 110);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextAndImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextAndImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 320,150,260,110)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextAndImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count-1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 340, 150, 290, 100);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS",12f,FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count-1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 340,150,290,100)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS",12f,FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Graphics;
    using Spire.Pdf.Security;
    using System.Drawing;
    
    namespace AddImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 200, 150, 130, 130);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly;
    
                //Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("ImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Graphics
    Imports Spire.Pdf.Security
    Imports System.Drawing
    
    Namespace AddImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 200,150,130,130)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly
    
                'Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("ImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextAndImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 320, 150, 260, 110);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextAndImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextAndImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 320,150,260,110)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextAndImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count-1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 340, 150, 290, 100);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS",12f,FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count-1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 340,150,290,100)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS",12f,FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Graphics;
    using Spire.Pdf.Security;
    using System.Drawing;
    
    namespace AddImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 200, 150, 130, 130);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly;
    
                //Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("ImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Graphics
    Imports Spire.Pdf.Security
    Imports System.Drawing
    
    Namespace AddImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 200,150,130,130)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly
    
                'Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("ImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextAndImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 320, 150, 260, 110);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextAndImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextAndImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 320,150,260,110)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextAndImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count-1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 340, 150, 290, 100);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS",12f,FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count-1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 340,150,290,100)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS",12f,FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Graphics;
    using Spire.Pdf.Security;
    using System.Drawing;
    
    namespace AddImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 200, 150, 130, 130);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly;
    
                //Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("ImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Graphics
    Imports Spire.Pdf.Security
    Imports System.Drawing
    
    Namespace AddImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 200,150,130,130)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly
    
                'Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("ImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextAndImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 320, 150, 260, 110);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextAndImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextAndImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 320,150,260,110)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextAndImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count-1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 340, 150, 290, 100);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS",12f,FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count-1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 340,150,290,100)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to sign detail
                signature.GraphicsMode = GraphicMode.SignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS",12f,FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Graphics;
    using Spire.Pdf.Security;
    using System.Drawing;
    
    namespace AddImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 200, 150, 130, 130);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly;
    
                //Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("ImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Graphics
    Imports Spire.Pdf.Security
    Imports System.Drawing
    
    Namespace AddImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 200,150,130,130)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image only
                signature.GraphicsMode = GraphicMode.SignImageOnly
    
                'Set the sign image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\verified.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("ImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Security;
    using System;
    using System.Drawing;
    using Spire.Pdf.Graphics;
    
    namespace AddTextAndImageSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 320, 150, 260, 110);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("TextAndImageSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports System
    Imports System.Drawing
    Imports Spire.Pdf.Graphics
    
    Namespace AddTextAndImageSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 320,150,260,110)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to image and sign detail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handSignature.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("TextAndImageSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace