Add Watermark to PDF Free — Stamp Text Privately
Stamp text like CONFIDENTIAL, DRAFT, or your own message across every PDF page. Free PDF watermark tool — no upload, no signup.
Watermark PDF
Drop a PDF file or click to select
All processing happens in your browser. No files are uploaded to any server. How to verify
Before sharing a sensitive document, it's common to stamp it with a watermark — CONFIDENTIAL, DRAFT, INTERNAL USE ONLY, NOT FOR DISTRIBUTION. But uploading that same sensitive document to an online watermarking tool defeats the entire purpose.
Pulsyr's watermark tool applies a text stamp to every page of your PDF entirely in your browser using pdf-lib. Your document stays on your device while you add the "don't share this" label to it.
Why this is actually private
- ✓The watermark is drawn onto each page locally via pdf-lib.
- ✓No server processing — the watermarked PDF is generated in your browser's memory.
- ✓Works offline after the page loads.
- ✓Verifiable: open DevTools → Network → add a watermark → zero requests.
Cmd+Option+I on Mac, F12 on Windows), go to the Network tab, then use the tool above. You'll see zero network requests during the conversion. Most online tools can't make this claim because they upload your file to do the work.How to use
- 1Drop your PDF into the upload area.
- 2Type the watermark text (e.g. CONFIDENTIAL, DRAFT, or a custom message).
- 3Adjust the opacity slider.
- 4Click Apply watermark. A watermarked PDF is generated locally.
- 5Download the watermarked file.
Who this is for
Mark confidential documents
Stamp CONFIDENTIAL on sensitive reports, legal briefs, or financial statements before sharing.
Label drafts
Add DRAFT watermark to unfinished documents to prevent confusion with final versions.
Protect proposals and quotes
Add NOT FOR DISTRIBUTION or your company name so shared documents can't be mistaken for final agreements.
Copyright notices
Add copyright or ownership markings to your documents before distributing.
Frequently asked questions
Can I use my own watermark image instead of text?▼
The current tool supports text watermarks. Image watermarks (like a logo stamp) are planned for a future version.
How visible is the watermark?▼
You control the opacity from 10% (very faint) to 80% (very visible). Default is 30% — readable but not intrusive.
Does the watermark appear on every page?▼
Yes. The watermark is applied uniformly across all pages of the PDF.
Is the watermark removable?▼
No. The watermark is drawn directly onto each page as part of the PDF's visual content. It can't be removed without re-scanning or OCR reconstruction.
Is my PDF uploaded during watermarking?▼
No. Everything happens in your browser via pdf-lib. Your document is never sent to any server.
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