FreePDF Tools
Free PDF Watermark Tool Online
Add a text watermark across every page of a PDF
Features
- Custom watermark text, color, opacity, and size
- Applied diagonally across every page
- Works on multi-page PDFs
- Runs entirely in your browser
Frequently Asked Questions
No — the watermark is added entirely in your browser using pdf-lib; your file never leaves your device.
How to Use PDF Watermark
Using PDF Watermark is simple and free. No sign-up required.
- Upload your PDF.
- Enter watermark text and adjust color/opacity/size.
- Click Add Watermark and download.
About PDF Watermark
PDF Watermark adds a customizable text watermark diagonally across every page of a PDF, entirely in your browser.
All iLoveToolZone tools work directly in your browser — no software installation or account required.