Steam username checker for custom profile URLs
On Steam, the part of your identity that has to be unique is your custom profile URL: steamcommunity.com/id/yourname. This Steam username checker tells you whether that URL is already taken, so you can set it before someone else does.
Custom URLs can be 3 to 32 characters using letters, numbers, hyphens and underscores. Your profile name, the one friends see in chat, doesn't have to be unique, and your login account name is private, so the custom URL is the name worth securing.
Gamers usually want one name across Steam, Twitch, YouTube, Roblox and Minecraft. Every search here shows all of them together, plus whether the matching domain is free for a stream or clan site.