Deployment

How to Convert PEM to PPK for PuTTY and Windows SSH

A practical guide to converting a PEM private key into a PPK file for PuTTY using PuTTYgen, plus common mistakes and CLI alternatives.

April 24, 2026•ShortIQ Editorial Team

What PEM and PPK Files Are

A PEM file is a common private key format used in Linux and many cloud environments such as AWS, DigitalOcean, and generic SSH server setups. A PPK file is PuTTY’s private key format, which is often needed on Windows when you connect to a server with PuTTY instead of the native OpenSSH client.

So when someone says they need to convert PEM to PPK, what they usually mean is this: they already have a server key in PEM format, but PuTTY expects the key in PPK format before it can use it.

The Easiest Method: Use PuTTYgen

The simplest and most reliable way to convert PEM to PPK is with PuTTYgen. This is the official utility from the PuTTY toolset and it is designed specifically for importing other private key formats and saving them as PPK.

If you are on Windows and already using PuTTY, this is almost always the right method.

Open PuTTYgen
Click Load
Switch the file filter to show all files if your PEM is not visible
Select your .pem file
After the key loads, click Save private key
Save the file as .ppk

Step-by-Step PEM to PPK Conversion in PuTTYgen

Below is the practical flow most Windows users follow. The important part is that you are loading the PEM private key first and then re-saving it in PuTTY’s format.

If PuTTYgen asks whether you want to save the key without a passphrase, that is up to your security preference. For personal testing or internal server access some users leave it empty, but for stronger protection you should set a passphrase.

txt

1. Open PuTTYgen
2. Click "Load"
3. Change file type from "PuTTY Private Key Files (*.ppk)" to "All Files (*.*)"
4. Select your .pem file
5. Click "Open"
6. Review the imported key
7. Click "Save private key"
8. Save the file as something like server-key.ppk

How to Use the New PPK File in PuTTY

After conversion, you still need to tell PuTTY where the PPK file is. In the PuTTY connection window, go to Connection, then SSH, then Auth, and browse for the PPK file under the private key field.

Once that is set, go back to the Session screen, enter your host or IP address, and connect as usual.

txt

PuTTY -> Connection -> SSH -> Auth -> Credentials

Private key file for authentication:
Select your .ppk file here

Command-Line Alternative

If you are not using the PuTTY GUI directly, you may still prefer PuTTYgen from the command line. This can be useful for automation or for users who already have the PuTTY tools installed and want a faster repeatable conversion path.

The exact options can vary by platform and version, but the idea is the same: import the PEM key and export a PPK file.

bash

puttygen server-key.pem -o server-key.ppk

Common Problems When Converting PEM to PPK

The most common issue is simply not seeing the PEM file in PuTTYgen because the default file filter only shows PPK files. Change the file selector to All Files and the PEM file should appear.

Another common problem is using the wrong file entirely. Make sure you are loading the private key file, not a public key, certificate, or random text file. If the key is damaged, truncated, or copied incorrectly, PuTTYgen may fail to load it.

PEM file not visible because of file filter
Wrong file type selected
Private key content damaged or incomplete
Using a public key instead of the private key

Do You Always Need to Convert PEM to PPK?

No. If you are using modern Windows OpenSSH from PowerShell or Windows Terminal, you may be able to use the PEM file directly with ssh and avoid PuTTY entirely. The conversion is mainly needed when your SSH workflow depends on PuTTY.

So the real decision is not just PEM versus PPK. It is also whether you are committed to the PuTTY toolchain or willing to use the native SSH tools available on your system.

bash

ssh -i server-key.pem ubuntu@your-server-ip

Best Practice After Conversion

Once the PPK file is created, keep both files secure. Do not share them casually by email or chat, and do not commit private keys into Git repositories. If you set a passphrase on the PPK, store it somewhere safe and manageable.

It is also a good idea to rename the PPK clearly so you know which server or environment it belongs to. That reduces confusion later when you manage multiple SSH keys.

Store private keys securely
Never commit private keys to source control
Use clear filenames for each server or environment
Prefer passphrases for stronger protection

FAQ

What is the easiest way to convert PEM to PPK?

The easiest method is to use PuTTYgen, load the PEM file, and then save it as a PPK file.

Why do I need a PPK file?

You usually need a PPK file when you connect to a server with PuTTY, because PuTTY uses PPK as its private key format.

Can I use a PEM file directly in Windows?

Yes, if you are using OpenSSH in PowerShell or Windows Terminal. The conversion is mainly needed for PuTTY-based workflows.

Why is my PEM file not showing in PuTTYgen?

PuTTYgen often defaults to showing only PPK files. Change the file filter to All Files and then select the PEM file.

Is converting PEM to PPK secure?

Yes, if you handle the files carefully. The main risk is poor storage or sharing of the private key after conversion, not the conversion step itself.

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