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 color PDF pages to monochrome grayscale to reduce printer ink and file size.
Split PDF pages into separate Odd (1, 3, 5) and Even (2, 4, 6) documents for manual duplex printing.
Inspect embedded image resolutions, color spaces, and compression formats inside PDF files.
Verify whether a PDF document is optimized for Fast Web View page-by-page streaming.
