Certificate Decoder

Decode SSL/TLS certificates to view their details in a human-readable format.

Enter a certificate and click 'Decode' to view details

About Certificate Decoder

This tool allows you to decode and inspect SSL/TLS certificates in PEM format. It displays certificate details such as issuer, subject, validity period, extensions, and fingerprints in a human-readable format.

How to use:

  1. Paste your certificate text in the input field (must be in PEM format)
  2. Alternatively, upload a certificate file (.pem, .crt, .cer)
  3. Click "Decode" to view the certificate details

Certificate Formats:

This tool works with certificates in PEM format (Base64 encoded, with BEGIN/END CERTIFICATE markers). If you have a certificate in a different format (like DER or PKCS#7), you may need to convert it first.