NOPPAW

Watermark PDF

Watermark PDF stamps your text — DRAFT, CONFIDENTIAL, a company name, a reviewer's mark — across every page of a document, diagonally by default, the way watermarked documents have looked for decades. You control the words, the size, how faint or bold it is, the angle and the color. The watermark is drawn onto a copy of the file, so the original remains clean.

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Accepted: PDF · Max 50 MB per file · Processed locally in your browser

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How to use Watermark PDF

  1. Choose or drop the PDF.
  2. Type the watermark text, for example DRAFT or CONFIDENTIAL.
  3. Adjust size, opacity, rotation and color to taste.
  4. Click Add watermark and download the stamped copy.

Supported behavior

  • Opacity from a barely-there 5% to a solid 100%, so the same tool marks review drafts and bold sample copies.
  • Rotation defaults to the classic −45° diagonal; set 0° for a horizontal stamp.
  • The text is centered on every page, whatever its size, and drawn above the content.

Best for

  • Marking draft reports and proposals during review.
  • Labelling confidential or internal documents.
  • Stamping ownership or 'sample' on preview copies.

Limits

  • The watermark is baked into the copy's page content — it is not a separate layer a reader can toggle off, which is the point, but keep the original if you need a clean version.
  • One text for all pages; per-page different text is not supported.
  • Very long watermark text at large sizes can overflow small pages — shorten the text or reduce the size.

Privacy notes

  • Everything runs on your device: the document you open never leaves your browser.
  • Stamping happens locally in your browser, so an unreleased draft marked CONFIDENTIAL never leaves your device.

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Watermark PDF FAQ

Can the watermark be removed from the output file?

It is drawn into each page's content of the copy, so it cannot be switched off like a layer. Anyone determined enough could edit a PDF, which is true of every watermark — keep and share the original only when a clean copy is intended.

Why is the default angle −45 degrees?

The rising diagonal is the long-standing convention for document watermarks: visible across the whole page without hiding any single line of text for long.

How faint should a draft watermark be?

Around 20–35% opacity in gray is readable without fighting the text. For 'do not distribute' sample copies, 60%+ in a color makes the message unmissable.

Can I watermark with a logo image instead?

Not in this tool — it stamps text. Text stays crisp at any size and cannot be separated from the page as an image file.