Watermark PDF
Stamp a text watermark across every page of a PDF — in your browser, nothing uploaded.
Report a problem
Drop a PDF to watermark
.pdf files
Add a PDF to begin. The first run loads the PDF engine once.
How to use
- Drop a PDF in, or tap the box to choose one — a preview of every page appears.
- Type your watermark text, set the opacity, size and colour, and untick any pages you want to skip.
- Press Add watermark & download to save the stamped PDF.
FAQ
Is my PDF uploaded anywhere?
No. The watermark is added entirely in your browser — the file never leaves your device, so it works offline and stays private. The PDF engine loads once on first use and is then cached.
How is the watermark placed?
A single line of text is drawn diagonally across the centre of each chosen page, at the opacity, size and colour you choose — subtle enough to read the page through it, but clearly marking the document.
Can I watermark only some pages?
Yes. After you load a PDF, a thumbnail of every page appears with a Watermark checkbox — all ticked by default. Untick any pages you want to leave clean, and only the ticked pages get stamped.
Can the watermark be removed?
It’s drawn into the page content, not stored as easily-stripped metadata. It can’t be toggled off, which is the point — though, like any visible mark, a determined editor could cover or crop it.