This article will show you how to generate a .pem file from an existing .ppk key.

1. Install putty on your mac

Done easily with homebrew.

$ brew install putty

2. Generate the keyWe will use puttygen to generate the key.

$ puttygen key.ppk -O private-openssh -o key.pem

• key.ppk: the original file name/path.
• -O private-openssh: the output type. private-openssh is used to save an SSH-2 private key in OpenSSH’s format.
• -o key.pem: the output file name/path.

3. Install the key

Installing the key is equivalent to copying it in your ~/.ssh directory.