your key file (mysite.com.key) will be privkey.pem your cert file (mysite.com.crt) will be cert.pem your ca file ( AlphaSSL.crt in your example) will be chain.pem or fullchain.pem ( depending exactly what you need ) -- https://community.letsencrypt.org/t/how-to-get-crt-and-key-files-from-i-just-have-pem-files/7348/2