How to convert an SSL certificate in linux

Question

Is there a way how to convert certificates between cer/pem/crt/der/pfx/p12 in Linux? I have an SSL certificate in a .cer file and I need it to be .pem in order to use it.

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Answer 1

Convert .crt to .p12

openssl pkcs12 -export -out server.p12 -inkey server.key -in server.crt

Where server.key , is the server key . server.crt is cert file from CA or self sigh