Validate Signature
Verify digital signatures in PDF documents. Check certificate validity, signer information, and document integrity.
Upload Signed PDF
About This Tool
Validate Signature allows you to verify digital signatures in PDF documents. Check if signatures are valid, view certificate information, and confirm document integrity.
Upload a signed PDF to see all signatures, their validity status, signer information, and whether the document has been modified after signing.
All validation happens locally in your browser. Your documents are never uploaded to any server.
How to Use
Upload Signed PDF
Upload a PDF document that contains digital signatures.
View Results
See all signatures found in the document with their validity status.
Check Details
View certificate information, signer details, and signing timestamp.
Export Report
Optionally download a JSON report of the validation results.
Use Cases
Document Verification
Verify that signed documents are authentic and have not been tampered with.
Compliance Audit
Check signature validity for compliance and audit purposes.
Certificate Review
View certificate details and expiration dates for signed documents.
Frequently Asked Questions
What does "valid" mean?
A valid signature means the document has not been modified since signing and the certificate chain is intact.
Can I validate multiple PDFs?
Yes, you can upload multiple PDFs and validate all signatures in batch.
Why might a signature be invalid?
Signatures may be invalid if the document was modified, the certificate expired, or the certificate is not trusted.