Watermark PDF
Stamp text onto every page of a PDF, right in your browser.
About this tool
Stamps a diagonal text watermark (like "CONFIDENTIAL" or "DRAFT") across every page of a PDF. Everything runs locally in your browser using the open-source pdf-lib library; your file is never uploaded anywhere.
Frequently asked questions
- Can I use a logo image instead of text?
- Not in this version — only a text watermark is supported. For an image watermark, use the Image Watermark tool on a screenshot or exported page instead.
- Can this watermark be removed?
- It's drawn as real page content, the same as any other text on the page — a determined person with PDF editing software could remove it, similar to how most simple text watermarks work. It's meant as a visible deterrent and labeling tool, not tamper-proof protection.
- Are my files uploaded anywhere?
- No — watermarking happens entirely on your device. Nothing is sent to any server.