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What is the format of account names?

The information I have a use for is:

  • what characters are permitted or prohibited?
  • what is the maximum length?
  • are they always treated as case-insensitive?

However, a complete, exact definition of the allowed format would be appreciated.

share|improve this question
possible duplicate of Minimum Length for Minecraft usernames? – Studoku Aug 11 '14 at 18:23
@Studoku Hm? This is an older, broader question. I just edited it a bit to expand its scope. – Kevin Reid Aug 11 '14 at 18:53
I will admit that that close vote was partly to prove a point and mostly to troll. – Studoku Aug 11 '14 at 18:56
up vote 25 down vote accepted

The username must be between 3 and 16 characters (inclusive).

The characters permitted are :


Usernames are case-sensitive in games (above your head), but when logging in using the username, whether is it in caps or not, will still work.

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Additional info: Logging in with a different username case does not change how you appear in-game. – Kevin Reid May 8 '11 at 20:02
The way Minecraft treats usernames is called case-preserving (though that term is usually only used when discussing filesystems). – Ben Blank May 8 '11 at 23:08
Are spaces allowed? – spudwaffle Jan 2 '13 at 17:29
@spudwaffle No. – SevenSidedDie May 7 '13 at 14:42
Can the name start with a number? – José Roberto Araújo Júnior Dec 7 '13 at 3:18

Trying to register with an illegal character gives an error and mentions the following as allowed:


And the longest username I could register was 'thisisalongusern'

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+1 for longest possible Name. – Joe the Person Oct 15 '11 at 20:36

protected by fredley Oct 31 '13 at 10:25

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