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Add Watermark to PDF

Add semi-transparent diagonal text watermarks to all or selected pages of PDF documents locally in your browser.

This tool runs in your browser.

PDF files stay in this browser and are not uploaded.

Choose a PDF to begin.

How to use

  1. 01Choose one or more PDF documents from your computer or phone.
  2. 02Enter watermark text and customize font size, opacity, and page ranges.
  3. 03Stamp watermarks onto the PDF and download the protected document instantly.

FAQ

Does adding a watermark corrupt existing text, vector shapes, or layouts?

No. The tool overlays an independent semi-transparent PDF content stream layer, leaving all original fonts, vectors, and page structures intact.

Can I stamp watermarks on specific pages only (like cover pages)?

Yes. Enter page numbers or ranges (e.g. 1-3 or 5,8) in the page field to apply the watermark exclusively to those designated pages.

Are confidential business or contract PDFs uploaded to a remote server?

No. All PDF parsing and stamping happen entirely inside your local browser memory using WebAssembly. Your files are never transmitted online.