Watermark PDF is a 100% free, browser-based utility that enables you to add a text watermark like confidential to a pdf. Unlike traditional cloud converters, all processing executes locally on your device with zero server uploads, delivering immediate results and ironclad data privacy.
About the Watermark PDF
A watermark marks a document as a draft, confidential or a copy, and discourages unauthorised sharing. Watermark PDF stamps your text onto every page with full control over size, colour, transparency and angle.
Place one watermark in the centre, run it diagonally across the page, or tile it in a repeating pattern that is hard to crop out. Your PDF is processed locally and never uploaded.
How to use the Watermark PDF
- Drop a PDF file into the box.
- Type your watermark text and set size, colour, opacity and layout.
- Click "Add watermark" and download the watermarked PDF.
Features
- Centre, diagonal or tiled
- Custom colour & opacity
- Adjustable rotation
- Applied to all pages
Why Choose In-Browser Watermark PDF vs Cloud Converters?
| Feature | Toolora (In-Browser) | Traditional Cloud Tools |
|---|---|---|
| Data Privacy | 100% Private (Files stay on device) | Uploaded to remote servers |
| File Size Limits | Unlimited (Limited only by your RAM) | Restricted (e.g. 10MB–50MB caps) |
| Processing Speed | Instant (Zero upload/download delay) | Slow upload & queue waiting |
| Ads & Popups | Clean, distraction-free | Heavy banner & interstitial ads |
Frequently asked questions
Can the watermark be removed?
The watermark is drawn into the page content. Determined users with PDF editing software may still be able to remove it, so tiled watermarks offer the strongest deterrent.
Will the watermark hide my text?
Use a low opacity such as 20–30% so the content underneath stays readable.
Which characters can I use?
Standard Latin letters, numbers and common punctuation are supported. Unsupported characters are replaced with a question mark.