How to Use OpenSSL to Convert Certificates or Keys Between PEM and DER

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Here are the commands:

To convert a certificate from PEM to DER:

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# openssl x509 -in input.crt -inform PEM –out output.crt -outform DER

To convert a certificate from DER to PEM:

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# openssl  x509 -in input.crt -inform DER -out output.crt -outform PEM

To convert a key from PEM to DER:

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# openssl  rsa -in input.key -inform PEM -out output.key -outform DER

To convert a key from DER to PEM:

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# openssl rsa -in input.key -inform DER -out output.key -outform PEM