PDF Watermarker & Page Numberer
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. No data is ever transmitted across the network.
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.
How to Use PDF Watermarker & Page Numberer
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.
Frequently Asked Questions
Does watermarking modify original vector text quality?
No, pdf-lib overlays vector text directly onto existing pages without rasterizing or degrading quality.
Can I watermark multi-page documents?
Yes, all pages in your document are stamped simultaneously in sub-second runtime.
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