Verify a signed document

Choose a PDF that was signed through Squire. We'll tell you whether it's byte-for-byte the document we sealed, and whether the signing record behind it is intact.

Your document never leaves your browser — it's fingerprinted on your own device and only the fingerprint is sent. We never receive the file.

Why does Adobe show a warning?

Squire seals every completed document cryptographically, so any change invalidates it. Our seal certificate isn't (yet) on Adobe's trust list, so Acrobat says "signature validity is unknown" — it's telling you it doesn't recognise the issuer, not that the document was altered. An altered document produces a much louder, explicit warning that the file has changed since signing.

You can silence it permanently by adding our seal certificate to Acrobat's trusted identities, or just use this page.

Download our seal certificate