Can I change opacity?

Yes. Set opacity between about 0.05 and 1.

Does it watermark every page?

Yes. The text is applied to all pages.

No. Watermarking stays in your browser.

Add a text watermark to every PDF page online. Free, private watermark tool that runs in your browser.

PDF

Runs entirely in your browser — files stay on your device.

Overlay text on every page

Drop a PDF

or click to browse

Shown diagonally across each page

Text

Opacity (0.05–1)

Stamp CONFIDENTIAL, DRAFT, or your brand across every page before sharing.

Opacity and diagonal placement keep the mark visible without blocking content.