Try Deep-Check for free

Is your signed contract valid?

Upload a signed PDF and we tell you whether the signature is intact, whether anyone changed it afterwards, whether the certificate is on the official EU trusted list, whether it is revoked and whether it carries a timestamp.

📄

Drop a signed PDF here

or click to choose it · 4 MB max

🔒 The PDF is sent to our server in the EU, analysed in memory and deleted. We keep neither the document nor the result.

What we check
  • That the signature is intact and what it covers
  • Whether the document changed after signing
  • Who issued the certificate and whether they are on the official EU list
  • Whether the certificate is revoked
  • The level: qualified or advanced signature or seal
  • The timestamp
What we do not check
  • That the content of the document is true
  • Scanned handwritten signatures: they are an image, not an electronic signature
  • Who the signer is beyond what their certificate says

Want this check in your company or via API? Write to us