Validate PDF Signature — Verify Digital Signature Online Free
Check whether a PDF's digital signature is valid and whether the document has been modified since signing.
How to validate a PDF signature
- 1Upload your signed PDF file
- 2Click 'Validate'
- 3View the validation result
- 4Confirm document authenticity and integrity
Features
- Detects all digital signatures in the document
- Displays signer name, reason, and signing date
- Checks document integrity (modified after signing or not)
- Browser-based — file is not uploaded to a server
Use cases
- Verify a signed contract or agreement before proceeding
- Confirm a PDF has not been changed after signing
- Retrieve signer information for documentation
FAQ
What does a valid signature mean?
It means the document has not been modified since it was signed and the certificate is trusted.
What if the signature is invalid?
The document may have been altered after signing or the certificate may not be trusted.
Can I validate multiple signatures in one PDF?
Yes. If the document contains multiple signatures, the tool will display the status of each one.