Stamp custom text watermarks and dynamic page numbers onto PDFs.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Upload your PDF file into the local watermarking workspace.
Set watermark text, opacity, angle, font size, and dynamic page numbering position.
Click Stamp & Download PDF to generate and download your stamped document.
No, pdf-lib overlays vector text directly onto existing pages without rasterizing or degrading quality.
Yes, all pages in your document are stamped simultaneously in sub-second runtime.
Zero-egress companion tools in the PDF Utilities suite
Convert PNG, JPEG, and WebP images to multi-page PDF documents.
Render and extract PDF document pages into high-resolution PNG/JPEG images.
Rearrange PDF page sequences (e.g. 3, 1, 2, 5, 4) in-browser with zero upload.
