Fingerprint PDF Track Document Recipients

Embed an invisible fingerprint to identify which recipient leaked a confidential document. Free, no upload.

// Fingerprint Settings

Recipient identifierThis ID is embedded invisibly. If the document leaks, trace it back to this recipient.

Fingerprint mode

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Drop your PDF here

or click to browse — up to 200 MB

0 / 1 filesMax 200MB per file

Frequently Asked Questions

A unique string combining your recipient ID and timestamp is embedded in the PDF's Keywords metadata field and as invisible white text on each page.

Open the PDF in a reader, go to File → Properties → Description (or Custom). Look for the Keywords field — it will contain the DOCLAIR-FP tag with the recipient ID and timestamp.

Someone who knows to look for it in the metadata can clear it. However, the invisible text on pages is harder to detect and remove without knowing it exists.

No. Everything runs in your browser using @cantoo/pdf-lib. Your file never leaves your device.