Watermark PDF
Stamp text across every page — great for drafts, confidential files and branding.
Drag & drop your PDF here
or
.pdf · Up to 50 MB · Processed in your browser
0%
Stamping pages…
Watermark added!
Done.
Something went wrong
Please try a different file.
About Watermark PDF
Watermark PDF stamps your chosen text diagonally across every page using pdf-lib, entirely in your browser. Mark a document as "DRAFT" or "CONFIDENTIAL", add a company name for informal branding, or label a file so its origin is obvious wherever it ends up.
You control the text, and the watermark is rendered semi-transparent so it doesn't obscure the page content underneath.
What a watermark is actually good for
A visible watermark isn't real security — it's a signal. Stamping "DRAFT" across a document under review prevents it from being mistaken for a final version; stamping "CONFIDENTIAL" or a company name across a file reminds whoever it's forwarded to that it isn't meant for wide circulation. That's exactly the job this tool does: a clear, diagonal, semi-transparent label applied consistently across every page.
How the stamping works
pdf-lib draws your chosen text as a new layer directly on top of each existing page — rotated diagonally and rendered at partial opacity so the original content underneath stays fully legible. Because it's added as real page content rather than a browser overlay, it survives printing, re-saving, and being opened in any standard PDF viewer, all without a single byte of your file leaving your device. The diagonal placement and opacity level were chosen specifically so the watermark reads clearly at a glance without competing with the text or images it sits on top of, whether the page is portrait, landscape, dense with paragraphs, or mostly a single image.
Watermark PDF: this tool vs. the alternatives
| Method | Cost | Privacy | Speed | Custom text |
|---|---|---|---|---|
| QuickPDFHubPro (this tool) | Free | Runs in-browser, no upload | Seconds | Any text you type |
| Adobe Acrobat (desktop/online) | Subscription required | Uploads to Adobe's servers (online version) | Seconds | Text and image watermarks |
| Manual per-page stamping (image editor) | Free / varies | Local, but slow | Minutes per page | Fully custom, very manual |
| Other online converters | Often free, some paywalled | Varies — check if files are uploaded | Depends on server load | Varies |
Tips for the best results
- Keep watermark text short — long phrases can wrap awkwardly at the diagonal angle on narrower pages.
- Pair with Protect PDF if you need actual access control, not just a visible label.
- Watermark before you merge multiple drafts together so the label carries through consistently.
- For a final, approved version, remember to re-run this tool with different text (e.g. "FINAL") or skip it entirely.
Key features
Custom text
Type any watermark text you like.
100% private
Runs client-side — no upload required.
Every page stamped
Applied consistently across the whole document.
Step-by-step guide
- 1
Drag your PDF into the box above, or click Choose PDF.
- 2
Type the watermark text you want stamped on every page.
- 3
Click Add Watermark and download the result.
Benefits
No file uploads — watermarking happens on-device
Diagonal, semi-transparent placement keeps content legible
Works on any page size or orientation
No watermark on the watermark tool itself — no branding forced on you