Type your text and set the opacity; it's drawn diagonally across each page.
How to add a watermark to a PDF
- Add your PDF to the panel.
- Type your watermark text, such as DRAFT or CONFIDENTIAL.
- Set the opacity, then click the button and download the stamped PDF.
When to watermark a PDF
A diagonal watermark is the standard way to mark a document's status: DRAFT before final review, CONFIDENTIAL for internal distribution, or your name and email on shared files to discourage misuse.
The watermark is stamped diagonally across every page at the opacity you choose, so content stays readable while the status is obvious.
Why watermark PDFs in your browser
Stamping runs locally, so the document never reaches a server. That matters when the watermark itself reveals that the file is confidential.
Free with no sign-up, on any browser. The PDF Shrink iPhone app offers the same local tools offline.
FAQ
Can I change how strong the watermark looks?
Yes. The opacity slider controls how faint or bold the watermark appears.
Where is the watermark placed?
Diagonally across every page, centered on the document.
Is the original file changed?
No. The watermark is drawn onto each page of a new copy.
Can I remove the watermark later?
Watermarks are drawn into the page itself, so they cannot be removed afterward. Test with a copy first.