How to Fingerprint PDFs
1. Open the **Fingerprint PDF** tool.
2. Enter recipient identifiers and generate custom watermarked copies.
August 17, 2025Updated 2026-10-014 min read
PDF Fingerprinting Free — Track Document Leaks
Add invisible, unique fingerprints to PDFs before sharing free — identify which recipient leaked a copy. No visible mark, no upload, in-browser.
Frequently asked questions
Is the fingerprint visible to readers?
No, markers are embedded at sub-pixel font spacing levels without altering visual layout.