Watermark PDF
Stamp text or a logo on PDF pages: position, tiling, rotation and opacity
Drop a PDF to add a watermark
Ctrl+V to paste from clipboard
PDF
Your files never leave your browser
Frequently Asked Questions
Related Tools
Runs on your device, not our servers
This page uses browser APIs (Canvas, WebAssembly, workers, etc.) so your files stay on your machine.
- Processing happens in this tab — close the tab and the session ends.
- No ZapFile account is required and we do not store your uploads (there are none).
- Download only what you choose; nothing is sent to us for “cloud processing.”
- Verify it yourself: DevTools → Network while using a tool — you should not see your file bytes uploaded to ZapFile.
- Add ZapFile to your home screen for a faster app shell and offline access to cached pages (tools still need a capable browser).