All tools
PDF Watermark
Stamp text or a logo across every page, with control over size, colour, angle and opacity.
Runs entirely in your browser — nothing is uploaded.
Document
Stamped in this tab — nothing is uploaded.
Drop the PDF to watermark
Placement
The watermark is drawn over the page content. Lower the opacity if it makes text hard to read — around 15–25% is usually enough to be unmistakable without getting in the way.