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Stamp DRAFT or CONFIDENTIAL across a PDF locally, right in the browser.

PDF/A is a stricter, self-contained PDF built to last decades. Here's how it differs from a regular PDF and when you actually need it.

Six concrete reasons a PDF refuses to shrink, how to diagnose yours, and when smaller just isn't possible.

What actually makes a PDF big, which compression knobs matter, and how to shrink it while keeping text and images sharp.

Upload vs in-browser processing, and why it matters for sensitive documents.

A technical walkthrough of how browsers can parse, modify, and rewrite PDFs locally with pdf-lib, pdfjs-dist, jszip, and Web Workers — and why the architecture itself is the privacy guarantee.

Split one PDF into smaller files locally, right in the browser.

Browser-based merge is fast, private, and good enough for most daily work. Here is how it works and where the limits are.

Get an oversized PDF under the 25 MB email limit without uploading it anywhere.

Modern browsers can compress PDFs without sending anything to a server. Here is what changed, how it works, and where it is still imperfect.