Common questions about WPS Validate Signature usually involve signature status, post-signing document changes, and signer identity checks; this FAQ includes 3 common questions and a glossary.
FAQ
How to validate digital signature in PDF when the result shows "Unknown"?
- Click the signature area first and review the certificate information.
- Check whether the current device trusts the related certificate.
- Run Validate Signature again and review the result in the bottom status bar.
- If the status still shows unknown, contact the signature provider to confirm whether the certificate is complete and valid.
What happens if the document is changed after signing?
- Open the document and run Validate Signature.
- Review the validity status in the validation result.
- If the document was changed after signing, the signature may appear invalid or the result may indicate an integrity issue.
- It is recommended to request the original signed file again.
How do I confirm the signer identity?
- Click the signature area in the document.
- Review the signer information in the signature details panel.
- Check the certificate information and signing time at the same time.
- Use the validation result to decide whether the signer identity information is trustworthy.
Glossary
| Term | Definition |
|---|---|
| Digital signature | An electronic signing method used to confirm signer identity and protect document integrity. |
| Certificate information | The digital certificate details attached to a signature, used to review signer identity and trust status. |
| Validity | Whether the signature is judged to be valid under the current verification conditions. |
| Document integrity | Whether the document has remained unchanged after signing. |