====== Certificates - Conversions - Convert .cer to .pem ======

A **.cer** file is just a **.der** file (.crt .cer .der).

<code bash>
openssl x509 -inform der -in cert.cer -out cert.pem
</code>

<WRAP info>
**NOTE:**  If the .cer file starts with **-----BEGIN CERTIFICATE**, then it is already in **.pem** format.

Just rename it to using a **.pem** extension.
</WRAP>