Category: PDF tools
Add Watermark to PDF
Stamp every page of a PDF with local watermark text
Choose a PDF, enter watermark text, adjust size and opacity, and download a stamped copy. The file is never uploaded.
No file selected.
Your PDF and watermark text are processed in this browser tab only.
Everything on this page is processed in your browser. Nothing is uploaded.
What this tool does
This tool opens your PDF in the browser, draws the same diagonal text watermark onto every page, and saves a new copy. It is useful for drafts, confidential files, review copies and internal documents that need a visible label before sharing.
How to use it
- Choose a PDF file from your device.
- Enter the watermark text and adjust size or opacity.
- Add the watermark and download the new PDF.
Privacy
This tool runs entirely in your browser. Your input is never uploaded, stored or shared — closing the tab removes it.
Frequently asked questions
- Is my PDF uploaded?
- No. The file is read and rewritten in your browser tab with pdf-lib.
- Does it change the original file?
- No. The original file is only read; the watermarked version is downloaded as a separate PDF.
- Can I remove the watermark later?
- This tool writes visible text onto each page. Keep the original file if you may need an unmarked copy.