How to Use the Signature Checker
Validate digital signatures in PDF, P7S, ZIP, and XML files directly in your browser.
Steps
- Drag and drop your digitally signed file into the upload box.
- Wait while the tool analyzes the cryptographic signatures.
- View the validation status, signer details, and certificate validity instantly.
About This Tool
This tool performs client-side cryptographic checks on PAdES, CAdES, ASiC, and XAdES signatures. It supports on-demand OCSP revocation checking to ensure the certificate wasn't revoked before signing.
FAQs
1. Are my signed documents uploaded anywhere?
No. The cryptographic validation happens locally. Only standard certificate revocation checks (OCSP) might ping external servers, but your document remains on your device.
2. What formats are supported?
It supports PAdES (PDF), CAdES (P7S), ASiC (ZIP containers), and XAdES (XML).
3. What does "revoked" mean?
If a certificate is revoked, it means the issuing authority canceled it before it expired, often due to a security compromise. Signatures made with revoked certificates are invalid.