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Add Watermark to PDF — Text Stamp & Overlay

Add text watermarks and stamps to your PDF pages for free in your browser. Customize font size, opacity, rotation, and color. No upload —

Watermarks communicate intent visually — DRAFT, CONFIDENTIAL, branded by X — so recipients do not confuse a review copy with a final deliverable. OpenPDF stamps text or image watermarks with adjustable font, size, colour, rotation and opacity, and lets you preview the composition before exporting. Everything renders locally with pdf-lib so the watermarked PDF never touches a server.

How it works

  1. Upload the PDF. Drop the PDF you want to watermark onto OpenPDF.
  2. Enter the watermark text. Type the text or choose an image. Adjust font, size, color, rotation, and opacity.
  3. Pick a position. Place the watermark in the center, corners, or tile it across every page.
  4. Export the PDF. OpenPDF stamps the watermark onto every page in your browser and hands you the watermarked PDF.

Common use cases

  • Stamping "DRAFT" across every page of a proposal before internal review.
  • Adding a "CONFIDENTIAL" mark to PDFs shared under NDA.
  • Branding client deliverables with a semi-transparent company logo on each page.
  • Marking exported samples with a visible source URL before sharing publicly.

Frequently asked questions

Can watermarks be removed by a determined user?

A flattened watermark is baked into the pixels of the page and is hard to remove cleanly, but modern PDF tools can sometimes undo a text overlay. For strong protection, combine with a large opacity and place over the main content.

Can I use an image watermark?

Yes, in addition to text. Upload a logo PNG (ideally with a transparent background) and position it with the same controls as text watermarks.

Can I watermark only specific pages?

Yes. Choose a page range — all pages, a custom range, or specific individual pages.

Is the watermark uploaded?

No. Watermark rendering happens on your PDF locally in the browser.

Why OpenPDF

OpenPDF is an independent project built around one principle: the PDFs you edit should never leave your device. Every tool — merge, split, sign, organize, annotate, compress, watermark, add page numbers — runs entirely in your browser using WebAssembly and modern JavaScript APIs. There is no upload step, no account, no email harvesting, and no premium tier gating the useful features. The codebase and the third-party scripts loaded for analytics and advertising are visible in the page source — Google AdSense and Google Analytics 4 load only after you accept cookies in the consent banner — so anyone can audit what is running before trusting the tool with sensitive contracts, scanned IDs, or financial documents.