SSL certificate format conversion

crt format to pem

openssl x509 -in www.x.com.crt -out www.x.com.pem
openssl x509 -in mycert.crt -out mycert.pem -outform PEM
openssl x509 -inform DER -in yourdownloaded.crt -out outcert.pem -text
openssl x509 -in mycert.crt -out mycert.pem -outform PE

Renaming
we can directly fullchain.pem rename "fullchain.crt
the privkey.pem rename privkey.key