Add Watermark to PDF
Stamp your PDF documents with custom text securely.
Upload PDF
Drag and drop your document here to add a text watermark.
Add Watermark to PDF Free
Stamp documents online securely
100% Client-Side Privacy
All processing runs directly in your local browser memory via WebAssembly and JavaScript. Your files are never uploaded to any remote server or third-party cloud.
Zero Latency & Lightning Fast
Eliminate upload and download wait times. Files are processed instantly using your device's native CPU & GPU acceleration.
No Limits, No Watermarks, 100% Free
Enjoy unlimited batch operations, maximum resolution outputs, and zero watermarks without ever needing to register or pay.
How to use this tool in 3 simple steps
Upload or drag and drop your file into the secure workspace.
Adjust your preferred settings or let our automated presets optimize the output.
Click convert/process and download your finished file instantly to your device.
Protect your intellectual property by adding custom text watermarks to your PDF documents. Whether it's drafting a "CONFIDENTIAL" stamp, writing "DRAFT", or applying your brand name, our free online PDF watermarker lets you adjust transparency, rotation, and font size. Everything is processed instantly, guaranteeing absolute privacy for sensitive contracts or reports.
Why FastPebble Beats Traditional Cloud Converters
Compare local in-browser processing vs conventional cloud platforms like iLovePDF, Smallpdf & CloudConvert.
| Feature | FastPebble Tools | Traditional Cloud Websites |
|---|---|---|
| Data Privacy & Security | 100% Private (No server uploads) | Uploaded to remote 3rd-party servers |
| Processing Speed | Instant (0ms network latency) | Slow (Upload + Queue + Download wait) |
| File Size Limits | Virtually unlimited (Uses device RAM) | Strict limits (Paywalls for 10MB+) |
| Cost & Watermarks | 100% Free Forever, No Watermarks | Subscription paywalls & daily limits |