Free Tool
Free SSL Certificate Decoder
Decode PEM, CRT, or CER certificates instantly. View all certificate details including SANs, key usage, and fingerprints.
100% client-side - your certificate never leaves your browser
What You Can Decode
Certificate Details
Subject, issuer, validity dates, serial number, and signature algorithm
SANs & Extensions
Subject Alternative Names, key usage, extended key usage, and basic constraints
Chain Support
Decode entire certificate chains and identify root, intermediate, and end-entity certs
Fingerprints
SHA-256 and SHA-1 fingerprints for certificate verification
Why Decode SSL Certificates?
Decoding SSL certificates is essential for security professionals, developers, and system administrators. Common use cases include:
- Verification – Confirm certificate details before installation
- Debugging – Troubleshoot SSL/TLS connection issues
- Chain Validation – Verify certificate chain completeness
- Compliance – Check certificates meet security requirements
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