This tool inspects whether a PDF contains recognizable digital signatures and displays signature status, signature metadata, and certificate chain details with local browser-side processing.
Key Features
- Detect digital signatures in PDF files
- Show verified, authenticity, integrity, and expired certificate states
- Extract signing reason, location, contact info, and signer name
- Display certificate validity, issuer, subject, and PEM text
Steps
- Choose a PDF file or drag it into the upload area.
- Wait for the local parser to finish the signature inspection.
- Review each signature badge set and certificate chain block.
- Copy PEM certificate text when you need deeper external certificate analysis.
Use Cases
- Contract and e-signature validation
- Audit checks and archive review
- Bid document and outbound file inspection
- PDF signature troubleshooting and chain confirmation
Field Guide
- Verified / Overall valid: the signature passes integrity, authenticity, and certificate validity checks together.
- Authenticity: shows whether the embedded certificate chain can be validated correctly.
- Integrity: shows whether the signed PDF digest still matches the recorded signature data.
- Certificate expired: shows that at least one certificate is outside its validity period and needs review with signing time.
- Validity period: helps compare certificate active dates with the expected signing timeline.
- Issuer: shows the authority or parent subject that issued the certificate.
- Subject: shows the certificate owner or signing identity.
- PEM certificate text: useful for copying into other certificate analysis tools or audit records.
Notes
- No detected signature may also mean the file uses an unsupported signing format.
- Expired certificates should be reviewed together with signing time and timestamp policy.
- This tool is designed for quick inspection and does not replace official CA or legal evidence workflows.