Verify a document

The independent portal for checking a Let's Seal document is authentic and unaltered. Free and public — you can even confirm it offline, with stock tools.

Drop a PDF here, or click to upload

The file is hashed and checked — it never leaves your control beyond the check.

How verification works

Cryptographic seal

A PAdES signature that chains to the Let's Seal certificate authority — proving the document is byte-for-byte what was sealed, and who sealed it.

Independent timestamp

A decentralised OpenTimestamps anchor on the blockchain. Free, permanent proof of when it existed, on a public ledger no one controls.

Check it yourself

Download the .ots proof and run ots verify yourself. The proof carries everything a verifier needs — the portal is a convenience, and the proof is the source of truth.

Don't just trust the badge — verify the file. A copied seal on a fake document has no valid signature and fails here. Learn more