UNVEILPAGE SIGN

Check a signed document

Drop a PDF signed with UnveilPage Sign to see its certificate of completion, and whether the file is exactly the one that was sealed. The file stays on your computer: your browser works out its fingerprint (SHA-256) and only that is looked up.

Drop the signed PDF here or click to choose it

What this checks

The file is unchanged: its fingerprint matches the signed copy UnveilPage sealed. Any edit, even one character, changes the fingerprint.
The certificate is genuine: UnveilPage signed it with its key (ECDSA P-256). The public key is published so anyone can check it.
Only signed copies: unsigned originals aren’t looked up, since they may have been shared before signing.