Add a Watermark to PDF
Stamp text across every page.
Drop a PDF here
Add a diagonal text watermark to every page
Choose fileAbout Watermark PDF
Add a text watermark to a PDF online for free. Overlay words like DRAFT or CONFIDENTIAL diagonally across every page — processed privately in your browser.
Because everything runs on your own device, PDFini works offline once loaded, keeps your documents private, and never adds watermarks. Bookmark it for next time.
How to watermark pdf
- 1Drop a PDF into the box above or click to select it.
- 2Type your watermark text, such as DRAFT or CONFIDENTIAL.
- 3Click “Add watermark & download” to stamp every page diagonally.
Frequently asked questions
Where does the watermark appear?+
The text is placed diagonally across the centre of every page at a light opacity, so it's visible without hiding your content.
Can I remove it later?+
The watermark is baked into the new PDF. Keep your original file if you'll need a clean copy later.
Are my files uploaded to a server?+
No. Every PDFini tool runs entirely in your browser using JavaScript. Your files are read and processed on your own device and are never uploaded, stored or seen by us.