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Add Watermark to PDF

Stamp custom text across every page. Add a text watermark to PDF files with full control of text, size, opacity, angle, color and position.

Your file never leaves your device — everything is processed locally in your browser.

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How to use Add Watermark to PDF

  1. Drop your file into the upload box above (or click to browse).
  2. Adjust the options to your liking.
  3. Click the process button — everything runs instantly in your browser.
  4. Download your result. Your file was never uploaded anywhere.

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Part of 23 PDF Tools on fltools — all free, all on-device.