electronic brain surgery since 2001


Random Monster MonsterID is a method to generate a unique monster image based upon a certain identifier (IP address, email address, whatever). It can be used to automatically provide personal avatar images in blog comments or other community services.

The download contains a PHP file which will generate a random monster by default. When given a seed request parameter the monster will be based on this parameter and will always be the same for the same parameter. A second optional parameter named size can be given to get a resized image.

The script and the body part images are licensed under the MIT license.

Some more info on how it all started is available at MonsterID as Gravatar Fallback.



  • 2018-04-03 – relicensed under MIT, moved to github
  • 2007-01-21 – added some more body and eye parts, select random body color
  • 2007-01-20 – initial release

Notable Implementations

MonsterID and variants are used at quite a few other places already. Here is a list of related sites that might be interesting to you: