Validate PDF Digital Signatures Free
Verify digital signatures in PDF: check certificate validity, signer info, and document integrity. Batch validation - free, private.
Upload Signed PDF
About This Tool
Validate Signature verifies the digital signatures in a PDF - checking certificate chains, signer details, and whether the document was modified after signing. Batch validate multiple files for audits.
Before relying on a signed document, confirm the signature is genuine and the content is untampered.
Validation runs locally in your browser, keeping the signed files private and the tool free.
How to Use
Upload the signed PDF
Drag and drop a PDF containing digital signatures.
View the results
See each signature's validity status and signer details.
Check the details
Review certificate info and signing time.
Export the report
Download a JSON report of the validation results.
Use Cases
Document Verification
Confirm signed documents are authentic and unchanged.
Compliance Audit
Batch validate signatures for audit and compliance.
Certificate Review
Inspect certificate details and expiration dates.
Frequently Asked Questions
What makes a signature valid?
The document is unmodified since signing and the certificate chain is intact and trusted.
Can I validate several files at once?
Yes - batch validation supports up to 10 PDFs.
Why might a signature be invalid?
If the document changed, the certificate expired, or the signer certificate is not trusted.