TikTok username rules
TikTok usernames are 2 to 24 characters long. Letters, numbers, underscores and full stops.
- Cannot end with a full stop.
- You can change it once every 30 days.
Source: TikTok help. Checked October 2026. Platforms change their rules; their help page is the final word.
A format check only. It does not say whether the name is free, and it is not legal clearance.