TileMill is no longer in active development. To learn more about our newer mapping tools see Mapbox Studio.
TileMill was a desktop application for designing maps. TileMill has been deprecated.
TileMill is no longer available to download, but you can install it from source using the instructions in its GitHub repository. Note that the Mapbox support team is not able to troubleshoot issues with TileMill.
Creating a new map? Mapbox Studio is the modern alternative to TileMill.