How to use the Roblox Username Checker
- Type one or more names (3–20 characters, letters, numbers, max one underscore).
- Click Check availability: each name shows as available, taken or not allowed.
- Use an available name at sign-up or in Settings → Account Info.
Frequently asked questions
How does this Roblox checker work?
It uses Roblox’s own username validation, the same check the sign-up form runs, so it also catches names Roblox doesn’t allow.
What does “Not allowed” mean?
Roblox rejected the name, for example because it breaks the rules or contains blocked words.
Does it cost Robux to change my username?
Yes, Roblox charges Robux for username changes.