证书签名

It works with standard X.509 digital certificates in .pfx and .p12 formats. You can also add details like the reason for signing and your location, which get embedded alongside the cryptographic signature in the document.

A visual signature just shows a graphic, while a certificate provides cryptographic proof of identity and document integrity. It creates a tamper-evident seal that reveals if the file was altered after signing, making it legally binding in many jurisdictions.

Yes. The certificate signature embeds a tamper-evident seal into the PDF. If the document is changed after signing, the signature becomes invalid, alerting recipients that the file's integrity was compromised after you signed it.

Yes. All signing happens locally in your browser, so your certificate and private keys never leave your device or get uploaded to any server. This keeps your sensitive credentials protected while you apply a verified signature.

It suits anyone needing verified, legally robust signatures, such as legal professionals signing contracts, government workers handling official documents, or businesses approving forms where cryptographic proof of identity and document integrity is required.