PDF mit Wasserzeichen — Kostenloses Online-Werkzeug

A PDF watermark tool stamps custom text diagonally across every page of a document, at an adjustable size and transparency, without permanently altering the underlying content beneath it. The result is a document that visibly carries a label — "DRAFT," "CONFIDENTIAL," a company name — on every single page, in a way that is difficult to simply crop or edit out.

Watermarking exists to communicate something about a document's status or ownership at a glance, to anyone who opens it. A reviewer looking at a draft contract should immediately understand it is not the final version. A sample report shared with a prospective client should make clear it is a preview, not a purchased deliverable. A confidential internal document should visibly announce that status on every page, not just on a cover sheet that might get separated from the rest.

The diagonal placement and adjustable opacity matter for two reasons: a watermark placed across the middle of the page, at an angle, is harder to remove or crop out than one confined to a corner or margin, and a semi-transparent watermark stays legible without obscuring the actual content underneath it. Choosing a lower opacity keeps the underlying text or image fully readable; a higher opacity or larger font size makes the watermark itself more prominent when that is the goal.

Freelancers and photographers commonly watermark proofs and sample work before sharing it publicly, so it can be viewed and evaluated without being usable as a final, unwatermarked product. Legal and financial teams watermark drafts with "DRAFT" or "NOT FOR DISTRIBUTION" to prevent an in-progress version from being mistaken for something final. Businesses watermark internal reports with "CONFIDENTIAL" before wider internal circulation. Students and educators occasionally watermark shared course material to indicate it should not be redistributed.

It's worth noting what a watermark is not: it is not encryption, and it does not restrict who can open or copy the file — for that, use Protect PDF. A watermark is a visible label, not an access control; the two are often used together, watermarking a document for context and then protecting it with a password for access control.

Learn more about the file format itself on Wikipedia's PDF entry.