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Foundry✦pdf

PDF tool · in your browser

Watermark a PDF online for free

Add a clear diagonal text stamp to every page without creating an account or sending the document to a server. Type the wording once, process the file in your browser, and download the marked copy.

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Drag & drop PDF file here

or click to choose a file

PDF · processed in your browser, never uploaded

How it works

  1. 1Select your PDF.
  2. 2Type the watermark text, e.g. CONFIDENTIAL.
  3. 3Click Watermark — the stamped PDF downloads instantly.

When this helps

  • Mark an unfinished proposal or manuscript as DRAFT before review.
  • Label internal documents CONFIDENTIAL before controlled sharing.
  • Add a recipient or project name to discourage accidental redistribution.

Tips for a clean result

  • Keep the text short so it remains readable across both portrait and landscape pages.
  • The watermark is added to the PDF content; keep the original if you may need an unmarked copy later.

Frequently asked questions

Where does the watermark appear?+

Diagonally and centered on every page, semi-transparent so the content stays readable.

Are my files uploaded?+

No. The watermark is applied in your browser; nothing is uploaded.

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