Retrom uses metadata providers to download metadata for your games. Currently, the only supported provider is IGDB. Support for more providers is planned.

IGDB

To use the IGDB metadata provider, you will need to create an account on the IGDB website and create a new application to get your client ID and secret. You can do this by following the instructions here.

Once you have credentials, add them to your configuration via the File > Configuration menu item: