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FactLock it.
You get proof of that exact file, at the time of the public transaction that recorded it.
FactLockFile · For Mac
What if the file everyone trusts isn't the original?
Be able to prove later whether a file has changed.Be able to prove later whether a file has changed.FactLock it.
Proof of the exact file you FactLocked on your Mac, at the time of the public transaction that recorded it. Anyone you share it with can check that proof free at https://factlockcam.com/open/. For larger files, use the Free Mac Proof Utility.
Saving or sending a file is not proof that a later copy still matches. FactLock it, and you have proof you can check.
FactLockFile Desktop gives a file on your Mac a SHA-256 fingerprint and a signed record. Later, check it in seconds and see whether even one byte is different. It accepts any file type. Video files can be up to 2 GB, audio files up to 1 GB, and all other files (images, PDFs, documents, and any other type) up to 2 GB. Files only, not folders.
Try FactLockFile free on your Mac.
Sign in and get 5 FactLocks at no cost for FactLockFile (5 in total, shown as “seals” in the app), separate from the allowance in the phone app. Paid desktop plans are not available yet.
FactLockFile for Mac 0.1.4 (Apple Silicon), signed & notarized: create FactLocks on Mac. This is not the Viewer.
Illustrative scene FactLock record MATCH
Fingerprint · SHA-2569f2c 81ab … 0d7e 41c3
File type · sizeimage/jpeg · 2.4 MB
Capture time · device-reported2026-11-02 09:14 UTC
SignatureValid
File checkMatches its record
Illustrative readout · not a customer record
The world has spent decades protecting files from being stolen. Now we need to protect our ability to prove what those files originally contained. FactLockIt — Preserve. Protect. Prove.
A match means the checked file still matches its FactLock record. It does not tell you whether a claim or photo is true.
How it works
How it works
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Share the file and its proof.
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Check the proof free online at https://factlockcam.com/open/.
For larger files, use the Free Mac Proof Utility. A free Windows utility for larger files is not available yet.
It checks the exact file and signed record, not what the file shows.
The Free Mac Proof Utility is the Free FactLockFile Viewer for Mac.
Not on a Mac? Get FactLockCam for iPhone or Android.
Protect what matters. Prove what hasn't changed.
Download for MacFactLockFile for Mac 0.1.4 (Apple Silicon), signed & notarized: create FactLocks on Mac. This is not the Viewer.