A SteamID is a unique string of 17 numbers attached to your profile permanently. It can be in the forms steamID64, steamID3, and steamID Hex. SteamID64 is a unique string of 17 digits. SteamID3 is ...

This is one of the easiest ways to search for Steam users by ID. Launch Steam app and click on the Community tab on the top of the app. You will then see FIND PEOPLE with a search box under it. Search ...