Free PDF Watermark Tool — Add Confidential Watermarks Online

Add custom dynamic text watermarks (Confidential, Recipient Email, Date) to your PDF files free online. 100% private browser-side processing.

Frequently Asked Questions

Does this watermark tool upload my PDF to a server?

No. The watermarking algorithm runs entirely inside your browser using client-side JavaScript (pdf-lib). Your document content stays 100% private.

Why should I watermark sensitive documents?

Watermarking prevents unauthorized screenshot sharing and identifies leaks by linking shared copies to specific recipient names or timestamps.

Get Started with DocTransfer

DocTransfer provides legally-binding e-signatures, client-side zero-knowledge encrypted vaults, dynamic watermarking, and real-time page-by-page viewing tracking. Start free today — no credit card required.

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