Validate Signature
Verify the authenticity and integrity of signed PDFs. Check X.509 certificate status and tampering alerts. 100% private verification.
Upload Signed PDF
About This Tool
Received a "signed" PDF and want to know if it's legitimate? The Validate Signature tool performs a deep forensic audit of the document's internal metadata. It checks the Cryptographic Hash to ensure the file hasn't been altered since the signature was applied.
The validator extracts the Signer’s Identity, the Signing Time (via embedded timestamps), and the Certificate Authority (CA) details. If the document was modified or the certificate has expired, our tool will provide a detailed warning, protecting you from potential document fraud.
Audit-Level Privacy: Verification happens entirely on your machine. We don't see the contracts you are validating, ensuring your business intelligence remains your own.
How to Use
Upload Signed PDF
Select the file you wish to audit.
Automated Audit
Our tool scans for digital signatures and verifies the cryptographic hashes.
Review Report
Check the "Green" or "Red" status. View details on who signed it and when.
Export Results
Download a JSON report of the signature status for your audit records.
Use Cases
Contract Audit
Confirm that a client has returned a correctly signed and untampered contract.
Inbound Verification
Check the digital seal on received invoices or government documents.
Identity Proof
Extract the full certificate chain of a signer to verify their credentials.
Frequently Asked Questions
What does "Document Modified" mean?
This is a red flag. It means someone changed the text or pages of the PDF after it was digitally signed, which technically voids the signature.
Does it check for CRL/OCSP?
The tool checks the basic certificate validity. For advanced real-time revocation (CRL) checks, some browser security limitations may apply.
Can it detect fake signatures?
Yes. If a signature is just a picture of a pen stroke without underlying cryptographic data, this tool will report that no digital signature was found.