SSH: Convert SSH Keys to PPK Format
In this article, we will show you how to convert a private key generated on a Linux/Mac (using the ssh-keygen command) to a ppk file that many Windows applications use (e.g. PuTTY).
1) Download (if you do not already have it) the PuTTY Key Generator (PuTTYgen) application by going here.
2) Open PuTTYgen
3) Click Conversions, then click import key
4) Locate your key file, then click open.
You can now save your key as a PPK file by clicking the Save private key button.
You can also save a public version of your key by clicking the Save public key button.