verify any authii signature

Verify a document, any time.

Sealed Authii documents prove who signed, and when, all on their own. Drop the PDF below and we'll validate every signature against the live Authii CA chain — no account, no Authii backend needed for the cryptographic checks.

Drop a sealed PDF here

or click to browse

Or look up by hash.

Paste an Authii document hash to look up its public verification record.

how authii signatures work
  1. 01Each signer touches their fingerprint sensor. Their device signs the document with a key that never leaves their hardware.
  2. 02Authii records each signature against the document, witnessed by a trusted timestamp authority.
  3. 03When everyone has signed, Authii bakes the signatures, certificates and timestamps directly into the PDF.
  4. 04The result is a self-contained, sealed document. Open it in any PDF reader, today or in 2050, and the signatures still verify.