SSL Decoder

Security OpenSSL Commands CSR Generator

This site checks the SSL/TLS configuration of a server. In shows you the full certificate chain, including all kinds of information about every certificate, as well as connection information like ciphersuites and protocol support.

Fill in either host + port or paste a CSR/Certficiate. Port defaults to 443.

Host

Port

Fast check (no connection details, no TLSA check, no certificate transparency submission)

CSR / Certificate

If you want to check CSRs on your own computer, run this OpenSSL command:

openssl req -in mycsr.csr -noout -text

If you want to decode certificates on your own computer, run this OpenSSL command:

openssl x509 -in certificate.crt -text -noout

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