Validate Signature
Verify digital signatures in PDF documents. Check certificate validity, signer information, and document integrity.
What this tool is best for
Verify digital signatures in PDF documents. Check certificate validity, signer information, and document integrity.
Why people use it
- Focused workflow for Validate Signature without requiring users to piece the job together across multiple tools.
- Fits access control, privacy, and document security tasks where users want a direct outcome instead of a general editor.
- Connects naturally with Digital Signature when the document workflow needs a clear next step.
What to watch for
- Best when the task is specifically validate signature; if the job changes, Digital Signature may be the better route.
- Results still depend on source-file quality, browser resources, and how complex the document structure is.
Supported inputs
PDF files, up to 10 input files, validate signature source documents
Common outputs
JSON output, validate signature result ready for download, share-ready final file
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.
You May Also Like
Add X.509 digital signatures to PDF documents. Sign PDFs with PFX, P12, or PEM certificates for legal validity.
View PDF document properties. See author, title, dates, and other metadata.
Unlock PDF files online by removing a known password. Create a password-free copy for easier editing, sharing, printing, or long-term archiving.