Category
Count PDF Pages in JavaScript: More Than Just a Number
2026-09-28 08:13:34
A single integer — the total number of pages in a PDF — sits behind a surprising number of real-world decisions: upload limits, paper estimation for printing, split operations, progress bars. Most PDF rendering libraries only draw pages and do not expose a simple count, and sending the file to a backend just to read a page count adds latency and privacy concerns.
Trim PDF Pages: Crop Margins and White Space with JavaScript
2026-09-28 08:12:39
PDFs often carry more whitespace than they need — scanned documents with thick borders, engineering drawings with generous margins, or invoices where only the center table matters. Cropping the page is the natural fix, but doing it in a browser-based workflow is not straightforward. Desktop tools break the web experience, and sending the file to a backend server raises privacy and compliance concerns.
Make Excel Data Visual with Conditional Formatting in JavaScript
2026-09-23 07:30:52
A sales table with twenty columns of numbers is accurate and unreadable. The eye cannot compare 43,210 against 38,900 across a row fast enough to find the weak quarter, and the person reading the report knows this — which is why they ask for a chart. But a chart per column means twenty charts, and now the worksheet is a gallery instead of a table.
Add Arrow Connectors in Excel in JavaScript (React)
2026-09-23 07:30:44
A line between two boxes in a flowchart says "these are related". An arrow from one to the other says "this one comes first". That distinction — direction — is what separates a connector from a decoration, and it is the one thing the basic `Lines.AddLine()` API cannot do on both ends. A process flow needs an arrow leaving each step; a cause-and-effect diagram needs arrows pointing in; a comparison sometimes needs double-headed arrows to show a bidirectional link. None of these are possible with a single `EndArrowHeadStyle`.
Insert Line Shapes in Excel in JavaScript (React)
2026-09-23 07:30:37
A worksheet is not always just a grid of numbers. Sometimes it is a canvas — a flowchart sketched between data blocks, a relationship diagram connecting teams to projects, a callout pointing from a note to the cell it annotates. In every one of these cases the missing element is a line: a straight stroke between two boxes, a curved arc around a region, an elbow connector that bends once and continues.
Clearer Excel Charts in JavaScript: Multi-Level Labels & Dual Axes
2026-09-23 07:30:28
A column chart with regions and months on the same axis has two problems, and they are not the same problem. The first is that the category labels collapse into a single row — "North", "Jan", "North", "Feb" — and the reader has to mentally re-group which month belongs to which region. The second is that when a growth-rate series is added alongside a sales series that runs into the millions, the growth rate becomes a flat line hugging the baseline, because one value axis cannot serve two magnitudes at once.
Reducing PDF File Size: Images, Fonts & Content Streams in JavaScript (React)
2026-09-18 08:16:08
A PDF is rarely just "too big". It is too big for one specific door — a mail attachment cap, an upload form, a storage quota — and whatever pushed it past that limit is usually one of three things. Compressing without knowing which one means guessing, and guessing costs either quality or another failed upload.
Reading and Extracting Excel Formulas in JavaScript (React)
2026-09-18 08:15:27
Somebody built this workbook years ago. It recalculates when the data changes, the totals move in ways nobody predicts any more, and there is no documentation — because the formulas are the documentation. Reading the numbers will not tell you how they were produced. Reading the rules will.