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What is the format of Minecraft.net account names? Specifically, what characters are permitted or prohibited, what is the maximum length, and are they always treated as case-insensitive?

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2 Answers 2

up vote 17 down vote accepted

The username must be 16 characters or less.

The characters permitted are :

abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_

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

abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_

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
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protected by fredley Oct 31 '13 at 10:25

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