import com.spire.xls.*;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;

public class Test {
    public static void main(String[] args)throws IOException {
        //Load the sample Excel file
        Workbook workbook = new Workbook();
        workbook.loadFromFile("Sample.xlsx");
        //Get the first worksheet
        Worksheet sheet = workbook.getWorksheets().get(0);

        //set the font
        ExcelFont font = workbook.createFont();
        font.setFontName("Arial");
        font.setSize(11);
        font.setKnownColor(ExcelColors.Orange);

        CellRange range = sheet.getCellRange("D1");
        //Add the commet
        ExcelComment comment = range.addComment();
        //Load the image
        BufferedImage bufferedImage = ImageIO.read(new File("Logo.jpg"));
        //Use the image to fill the comment
        comment.getFill().customPicture(bufferedImage, "Logo.jpg");

        //Set the height and width for the comment
        comment.setHeight(bufferedImage.getHeight());
        comment.setWidth(bufferedImage.getWidth());
        //Show the comment
        comment.setVisible(true);

        //Save the document to file
        workbook.saveToFile("output/setimageComment.xlsx", ExcelVersion.Version2013);

    }
}

using System.IO;
using System.Net;
using Spire.Pdf;

namespace DownloadPdfFromUrl
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a PdfDocument object
            PdfDocument doc = new PdfDocument();

            //Create a WebClient object
            WebClient webClient = new WebClient();

            //Download data from URL and save as memory stream
            using (MemoryStream ms = new MemoryStream(webClient.DownloadData("https://www.e-iceblue.com/article/toDownload.pdf")))
            {
                //Load the stream
                doc.LoadFromStream(ms);
            }

            //Save to PDF file
            doc.SaveToFile("result.pdf", FileFormat.PDF);
        }
    }
}

Imports System.IO
Imports System.Net
Imports Spire.Pdf

Namespace DownloadPdfFromUrl
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Create a PdfDocument object
            Dim doc As PdfDocument = New PdfDocument()

            'Create a WebClient object
            Dim webClient As WebClient = New WebClient()

           'Download data from URL and save as memory stream
           Dim pdfData As Byte() = webClient.DownloadData(""https://www.e-iceblue.com/article/toDownload.pdf"")
           Using ms As New MemoryStream(pdfData)
           'Load the stream
           doc.LoadFromStream(ms)
 End Using

 'Save to PDF file
 doc.SaveToFile(""result.pdf"", FileFormat.PDF)
        End Sub
    End Class
End Namespace

import com.spire.xls.*;
import java.io.IOException;

public class replaceTextwithImage {
    public static void main(String[] args) throws IOException {

        //Load the sample Excel document
        Workbook workbook = new Workbook();
        workbook.loadFromFile("Sample.xlsx");
        //Get the first worksheet
        Worksheet worksheet = workbook.getWorksheets().get(0);

        //Find the text string {{Image}}
        CellRange[] ranges = worksheet.findAllString("{{Image}}", false, false);
        for (CellRange range : ranges) {
            //set the text as null
            range.setText("");

            //get the row and column of the searched range
            int row = range.getRow();
            int column = range.getColumn();
            //Add the image to the searched range
            worksheet.getPictures().add(row, column, "logo.jpg", ImageFormatType.Jpeg);

            //Save the document to file
            workbook.saveToFile("replaceTextwithImage.xlsx", ExcelVersion.Version2013);
            }
        }
    }