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Add Watermark to PDF — Text Stamp & Overlay

Watermark PDFs with 5 text presets (DRAFT, CONFIDENTIAL, SAMPLE, COPY, VOID) or custom — font 12-160pt, opacity 5-100%, rotation -90° to +90°. Up to 5000 pages, no upload.

  • Add text watermarks with custom font, size, color, opacity
  • Rotate and position anywhere on the page
  • Preview before applying — watermark renders via pdf-lib locally

Watermarks signal intent visually — DRAFT, CONFIDENTIAL, SAMPLE — so a review copy is not mistaken for a final deliverable. OpenPDF ships 5 built-in presets (DRAFT / CONFIDENTIAL / SAMPLE / COPY / VOID) plus custom text, with font size 12-160pt, opacity 5-100%, rotation -90° to +90° and adjustable RGB color. Renders locally with pdf-lib across up to 5000 pages per document, auto-shrinking any text that overflows the page width — the watermarked PDF never leaves your browser.

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.

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