Add a Watermark to a PDF

Watermark PDF — how it works

Stamp text (e.g. CONFIDENTIAL or your name) diagonally across every page of a PDF, in your browser. Private and free.

Why FileZap is different

• Truly private. Unlike most online tools that upload your files to a server, FileZap processes everything inside your browser. Your files never leave your device.
• Instant. No upload/download round-trip and no processing queue — results appear the moment you drop a file.
• No catch. No sign-up, no email, no watermark, no daily limit.

FAQ

What can the watermark say?

Any text you type — e.g. CONFIDENTIAL, DRAFT, or your name — is stamped diagonally across every page.

Can the watermark be removed by others?

It is drawn into the page content, so it is not a simple layer to toggle off — good for basic protection.

Is my PDF uploaded?

No, the watermark is applied in your browser only.