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Add a Watermark to a PDF

Place a text watermark — like “DRAFT” or “CONFIDENTIAL” — across every page, with a live preview of size, opacity and angle.

Add a PDF to watermark

or drag and drop a file here

Accepts a single PDF. Text watermarks only (up to 60 characters); image watermarks are not supported yet.

How to watermark a PDF

  1. Add your PDF.
  2. Type the watermark text and adjust opacity, size and the diagonal option — the preview updates live.
  3. Click Add watermark.
  4. Download the watermarked PDF.

Supported files and limitations

  • The watermark is drawn on top of page content on every page, centered.
  • It becomes part of the page, but it is not tamper-proof — someone with a PDF editor can remove it. Treat it as a label, not protection.
  • Password-protected PDFs must be decrypted first.

Common problems

  • The watermark hides important content — lower the opacity (30% works for most documents) or reduce the size.
  • Non-Latin characters fail — the built-in Helvetica font covers Latin scripts; Cyrillic, CJK and Arabic text are not supported yet.

What happens to your files?

This tool runs entirely in your browser. Your file is opened in your device's memory, processed there, and the result is saved back to your device. The document is never uploaded to a server. You can confirm this yourself: open your browser's developer tools, switch to the Network tab, and process a file — no request contains your document. Closing the tab discards everything. See how local processing works.

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