Add a visible PDF watermark locally.

Enter up to 60 characters, choose the opacity, and mark every page without sending the document to a server.

Local file tool

Watermark PDF

No server upload

Add text to every page · Processed on your device

The watermark is embedded into a separate PDF on your device. Every page is preserved and the generated document is validated before download.

A visible watermark can communicate status or ownership, but it is not encryption and does not prevent copying or editing.

Good to know: A visible watermark is not encryption, access control, or proof of ownership.

Is watermarking processed locally?

Yes. The PDF remains in this browser while the watermark is added.

Can I change opacity?

Yes. Choose from 5% to 50% opacity.

Does watermarking secure a PDF?

No. It adds a visible mark but does not encrypt the document.