Watermark PDF
Stamp a text watermark across every page of a PDF — in your browser, nothing uploaded.
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.
- Type your watermark text and set the opacity, size and colour.
- 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 every page, at the opacity, size and colour you choose — subtle enough to read the page through it, but clearly marking the document.
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.