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This article is considered "so old it's no longer relevant". Please see VRChat's Official Avatar Guidelines until this article is updated. Aim for "medium" or better rank.

In general there are no limits to how you design your Avatar besides that it can not be NSFW, racist or be of a political or cultural figure. However there are some unspoken guidelines that people in VRChat appreciate when followed.

1. Try to keep Avatars below 10,000 polygons. Use a low poly model, with the high poly version baked as a normal map to maintain the high quality on a low poly model.

2. For music/sounds...

 A) Turn off play on wake. 
 B) Lower the volume, often 0.1 is a good balance. 
 C) Set the spatial to 3D so any sounds originate from your avatar instead of server wide. 
 D) Don't spam it, or pick annoying sounds.

3. While it is sometimes fun to have an excessively scaled avatar that is 40 feet tall, try to recognize when it is appropriate to use it, and when others may find it annoying. For example it wouldn't be right to use one during Gunters Universe.

4. Try to keep avatars PG-13 (Publicly wearing NSFW avatars is a punishable offense, as stated on one of the official loading panels. Abide by the rules and only wear NSFW avatars in private worlds.)