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Certificate Decoder

Decode X.509 PEM certificate details.

FAQ

What details can I decode? Subject, issuer, validity window, serial number, fingerprints, and SAN entries.

Can I decode self-signed certificates? Yes, any valid PEM X.509 certificate can be parsed by this tool.

What tool should I use with this decoder? Use SSL Checker for live endpoint checks and Certificate Key Matcher to confirm key pairing.