Watermark PDF Files Online

Stamp a custom diagonal text watermark across every page of your PDF.

Select a PDF file

or drop your PDF here

Watermark settings

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Applying watermark…

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Watermark Applied!

Every page of your PDF has been stamped.

How to Add a Custom Watermark to a PDF

  1. Upload your PDF file to the watermarking tool.
  2. Type your custom text, choose the font, opacity, and positioning.
  3. Click Add Watermark to stamp it across all pages permanently.
  4. Download your securely branded and protected PDF document.

100% Client-side

Watermarking is powered by pdf-lib and runs entirely in your browser. Your file never leaves your device — no uploads, complete privacy.