How do I decode an SSL certificate?

Paste your PEM encoded certificate into our decoder tool and click 'Decode Certificate' to see all information including issuer, subject, and expiration date.

What is an X.509 certificate?

X.509 is a standard format for public key certificates, used in many network protocols including TLS/SSL.

🔓 Certificate Decoder

Certificate Decoder — Free SSL Certificate Decoder

Decode X.509 SSL certificates to view issuer, validity period, subject alternative names, and all certificate details.

📖 Learn more: How to read an SSL certificate (X.509 fields explained)

Decode Certificate

🔒 Your certificate is decoded in memory only and is never logged or stored on our servers. Privacy Policy

Paste your certificate below (including BEGIN and END lines):

What is Certificate Decoding?

Certificate decoding allows you to view all the information contained in an SSL/TLS certificate, including the issuer, validity dates, subject details, and extensions.

Certificate Decoder — Free SSL Certificate Decoder

Decode Certificate

What is Certificate Decoding?

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