Add a Watermark to a PDF
Stamp a diagonal text watermark such as CONFIDENTIAL or DRAFT across every page of a PDF. Pick the text, opacity, font size, color, and angle, then download the marked file. Everything runs in your browser with pdf-lib, so the PDF never leaves your device.
How to watermark a PDF
- Drop a PDF in, or click to browse.
- Type the watermark text and adjust opacity, size, color, and angle.
- Click add watermark and download the marked PDF.
Examples
Mark a contract as confidential
A 12-page contract, text CONFIDENTIAL at 30% opacity, 45 degrees
The same PDF with a translucent diagonal stamp on every page
Frequently asked questions
Is my PDF uploaded anywhere?
No. The watermark is drawn entirely in your browser with pdf-lib. The PDF never leaves your device, so confidential documents stay private.
What text and styling can I use?
Type any single line of text, then set its opacity, font size, color, and angle. A diagonal 45 degree stamp is the classic look, but you can also lay it flat at 0 degrees.
Does the watermark go on every page?
Yes. The same text is stamped, centered, on every page of the document in one pass. There is no per-page configuration.
Can the watermark be removed later?
It is drawn into the page content, not stored as a separate layer, so it is not a one-click removal. It is meant to mark a document, not to encrypt or lock it.
What if my PDF is password protected?
If a PDF opens without a password in your viewer, it will watermark here. Documents that require a password to open are not supported.
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