Converting AWS .PEM keys to .PPK for use in Putty
Here are the commands you will need to convert the AWS key so it can be used with Putty. You’ll need to have Puttygen installed. This is part of the default Putty install so shouldn’t be a problem if you have installed Putty under Windows or Linux.
To convert the private key:
puttygen keyfile.pem -O private -o keyfile.ppk
To display the public key:
puttygen keyfile.pem -L