The tool uses the native OpenSSL library, enabling certificate decoding from PEM, DER, raw Base64, and automatic input format detection.

Yes – certificates in DER format are automatically identified and converted to the correct PEM format before they are decoded.

The SSL Decoder displays the key type (RSA, ECC, DSA), key length in bits, and the signature algorithm associated with the certificate.

No – the tool supports certificates with and without SAN. If the SAN field is missing, an appropriate notification will be displayed.

No – the tool focuses solely on the technical structure of the certificate and does not validate CA policies, OIDs, or trust levels.

Yes – any X.509 certificate, regardless of its position in the chain, is supported.

Yes – if the user pastes a certificate chain, the tool will decode the first certificate in the sequence.

No – all operations are carried out locally, and certificates are neither transferred nor stored.

The SSL Decoder does not perform real-time validation but presents exact validity dates, allowing manual verification. For this purpose, we recommend our SSL Monitor tool.

No – the current version focuses on key parameters. Support for full extensions may be added in a future release.