Enrich your maps with hover tooltips and clickable pop ups. Reveal details in your data by embedding numbers, graphs, and images into your map. TileMill leverages UTF-8 grid technology allowing you to leverage interactivity for hundreds of thousands of data points while maintaining high performance.

UTF-8 grid technology

TileMill implements the UTF-8 grid specification – a standard for describing interactive data alongside tile images. UTF-8 grid is fast, flexible, and scalable making it perfect for mapping whole countries down to to individual city blocks.

Learn more about UTF-8 grids →

Embed graphs & images

Leverage custom interaction formatters and templates to insert graphs, images, links, and other content into your maps. Interactive content can cover the full spectrum of HTML and CSS.