Instagram username rules
Instagram usernames are 1 to 30 characters long. Letters, numbers, full stops and underscores.
- Cannot start or end with a full stop.
- No two full stops in a row.
Source: Instagram 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.