You can use CloudLinux Selector to enable GD extension in PHP via Plesk.

 

1. Log in to your Plesk account.

2. In the right-hand sidebar, click on PHP Selector.

 

3. Click on the Extensions menu.

Note: If the Extensions page shows an error related to the native PHP version, change it to a non-native version first.

 

4. Tick mark the GD Once enabled, it will display a success message.

The message will read that the module GD is saved.