Validate and check
Roblox Username Checker
Enter a Roblox username to check local formatting rules first, then run a server-side availability check.
This tool is not affiliated with Roblox.
Need name ideas first?
Generate style-based Roblox username ideas, copy the best ones, and come back here to check availability.
Open username generatorFrequently Asked Questions
What makes a Roblox username valid?+
A valid Roblox username is 3 to 20 characters long and uses only letters, numbers, and underscores. This checker validates the format before making a live availability request.
Can Roblox usernames have underscores?+
Yes. Roblox usernames can include up to one underscore, but the underscore cannot be the first or last character.
Why is my Roblox username not available?+
A username may already be taken, blocked by Roblox moderation, reserved, or temporarily unavailable through Roblox's validation system.
Is this tool official Roblox?+
No. This tool is not affiliated with Roblox. Always verify important username choices directly on Roblox.