SSL Converter – How to convert your SSL certificate to different formats using OpenSSL

If you have your certificate file in a format that your server doesn’t accept, you’ll need to convert the certificate file’s format.
You can easily do this on your own system by running a few OpenSSL commands.
Down below, you can find the OpenSSL commands that you’ll need based on your certificate format and server type.

OpenSSL commands to convert PEM file

Convert PEM to DER

openssl x509 -outform der -in certificate.pem -out certificate.der

Convert PEM to P7B

openssl crl2pkcs7 -nocrl -certfile certificate.cer -out certificate.p7b -certfile CACert.cer

Convert PEM to PFX

openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile CACert.crt

OpenSSL commands to convert DER file

Convert DER to PEM

openssl x509 -inform der -in certificate.cer -out certificate.pem

OpenSSL commands to convert P7B file

Convert P7B to PEM

openssl pkcs7 -print_certs -in certificate.p7b -out certificate.cer

Convert P7B to PFX

openssl pkcs7 -print_certs -in certificate.p7b -out certificate.cer

openssl pkcs12 -export -in certificate.cer -inkey privateKey.key -out certificate.pfx -certfile CACert.cer

OpenSSL commands to convert PFX file

Convert PFX to PEM

openssl pkcs12 -in certificate.pfx -out certificate.cer -nodes