A watermark is one of the fastest ways to signal that a document is a draft, confidential, or not for distribution — and it shouldn't require design software to add one. This tool stamps your text directly onto every page using pdf-lib, with full control over color, size, opacity, and rotation angle, plus an option to tile it repeatedly across the page for extra visibility. As with every tool here, your PDF is processed locally in a web worker and never leaves your browser.
How to use the watermark pdf tool
- 1
Upload your PDF
Drop in the file you want to watermark.
- 2
Set your text and style
Type the watermark text and adjust its color, size, opacity, and angle.
- 3
Apply and download
Click Add watermark & download — every page gets stamped in one pass.
Common use cases
Mark a document as a draft
Stamp "DRAFT" diagonally across every page before sharing for review.
Protect confidential material
Add a "CONFIDENTIAL" watermark before distributing internal documents.
Brand a document
Repeat a company name or reference number lightly across every page.
Frequently asked questions
Yes — the opacity slider lets you go from a very subtle tint to a bold, solid stamp.