Converting Certificates Using OpenSSL

Below is a brief example of how to use OpenSSL on Windows to convert certificates from one format to another. I have personally found this useful for converting PFX certificates to PEM format for use on devices.

If you don’t have OpenSSL for Windows installed, head over to where you will find a link to for the installer.

Converting a PFX to PEM format example. Note you will be prompted to provide the certificate password.

openssl pkcs12 -in c:t\empcert.pfx -nodes -out c:\tempcert.pem

openssl x509 -in c:\tempcert.cer -inform DER -out c:\tempcert.pem -outform PEM

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