Prevent unauthorized use of your work. Our Add Watermark tool lets you add text or image watermarks to your PDFs — with customizable opacity, position, and size.
or click to browse. Processing happens 100% in your browser.
🔒 Your file stays on your device. We never see it.
Select your PDF.
Configure your watermark.
Get your protected PDF.
Add custom text.
Upload your logo.
Opacity, size, position.
Local processing.
Unmarked draft • Risk of misuse • No branding
Clear watermark • Protected • Branded
| Types | Text or image (PNG/JPG) |
|---|---|
| Opacity | 10-100% adjustable |
| Method | WebAssembly overlay |
| Processing Method | WebAssembly (WASM) |
| Browser Memory | < 512MB allocated |
| Supported PDF Versions | 1.4 through 2.0 |
| Output Quality | Lossless / 300 DPI |
| Feature | PDFDocStudio | Cloud Competitors |
|---|---|---|
| File Uploads | ❌ Never | ✅ Required |
| Account Needed | ❌ No | ✅ Often |
| HIPAA Friendly | ✅ Yes | ⚠️ BAA Required |
| Max File Size | 50MB | Varies |
| Price | Free | Freemium |
Never. Free outputs are identical to paid outputs. No watermarks, no ads injected into PDFs, no quality reduction.
Since processing is local, a crash only affects the current session. Your original file remains untouched on your hard drive. Simply reopen the tool and re-upload.
100% free. 100% private. 100% in your browser.
Add a Watermark Now