Add a watermark to a PDF
Stamp text across every page — DRAFT, CONFIDENTIAL, a name — at the angle and weight you set.
Runs in your browser. Nothing is uploaded.
The text is drawn into the document rather than composited over a picture of it, which matters more than it sounds: the pages underneath stay text, so a watermarked contract is still searchable, still selectable and still the same file size. A tool that flattens each page to an image gets you a watermark and loses everything else.
It goes on centred and diagonal by default, because a watermark in a corner is a watermark that can be cropped off. The angle runs from flat to steep, and the opacity is the setting that actually matters — dark enough to be unmistakable, light enough that the page underneath is still readable, which is usually somewhere around a quarter.
The size is a fraction of the page rather than a point size, so the same setting reads the same on A4, on Letter and on a landscape slide. Every page of every file dropped in gets the same stamp; there is no per-page exception, because a document with one unstamped page is a document that has not been stamped.
Step by step
- 1Drop in the PDF.
- 2Type the text, then set its size, how dark it is, and the angle.
- 3Press Download PDF.
Questions
Can the watermark be removed afterwards?
It is drawn into the page content, so it cannot be toggled off — but it is not security. Anyone determined can edit it out with a full PDF editor. Treat it as a label, not a lock.
Can I use an image as a watermark?
Not yet — text only. A logo watermark is a separate job and is not built here.
Does the file get bigger?
Barely. A line of text per page and one embedded font is a few kilobytes across the whole document.