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UTFGrid is a specification for rasterized interaction data. As of version 1.2, it was removed from incubation in the MBTiles Specification and split into its own repository.

See for per-version changes.


The Visible Map demo is an example of client-side interaction using UTFGrid encoded features.

Glower shows how to do feature highlighting.

Mapnik's grid_renderer is an example of code that can encode spatial features into UTFGrid.


This specification is licensed under a Creative Commons Attribution 3.0 United States License.

Applications which make use of the specification are not subject to any restrictions.


  • Tom MacWright (tmcw)
  • Will White (willwhite)
  • Konstantin Kaefer (kkaefer)
  • Justin Miller (incanus)
  • Dane Springmeyer (springmeyer)
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