Question: how to convert pem file to ppk?
Answer: Step 1 – Open PuTTYgen software and click on load button.
Step 2 – Now select . pem file from your system. ... 
Step 3 – Now you will see a successful import message.
Step 4 – Your public key will appear on PuTTYgen screen and you can save . ppk files by using Save private key button on the screen to save private key files.