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Certificates - Conversions - Convert .pem to .pkcs12

To convert a PEM certificate file and a private key to PKCS#12 (.pfx .p12):

openssl pkcs12 -export -out cert..pkcs12 -inkey privateKey.key -in cert.crt -certfile CACert.crt

With an intermediate certificate

You need to concatenate all the PEM files into one, then convert it to PKCS#12:

cat certificate.crt intermediate.crt > bundle.crt
openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in bundle.crt