Authenticate Any Signature.

Upload a photo, compare to verified references, and get an AI-powered authenticity verdict in seconds. SignAuth AI helps collectors, dealers, and curious minds detect forged signatures and verify autographs.

Analyze a Signature

How it works

  1. Upload a Photo — snap or upload a clear shot of the signature.
  2. AI Comparison — our model compares key stroke traits against verified references.
  3. Get a Verdict — receive a confidence score and detailed trait breakdown.

Trusted by collectors

SignAuth AI compares submissions against more than 100 verified famous signatures, including presidents, athletes, musicians, actors, and historical figures. Available on the web and as an iOS app.