Short Tip: Convert PEM files to CRT/DER

Within the Linux eco system certificates are often exchanged in PEM format. However, when you have to deal with other, most often proprietary eco systems you must be able to export the certificates in other file formats. For example, if you have certificates stored as PEM files and need to export them in DER format which often ends in .crt, .cer or .der you can use openssl to rewrite them:

$ openssl x509 -outform der -in MyCertificate.pem -out MyCertificate.crt