GeoJSON to TopoJSON Converter

Convert GeoJSON format to TopoJSON format. TopoJSON uses topology encoding to reduce file sizes significantly while maintaining all geographic information. Supports conversion in both directions.

Map Preview

Enter GeoJSON to see the map preview

How to use:

  1. Paste your GeoJSON data into the input area
  2. Click 'Convert to TopoJSON' to transform your data
  3. View the converted TopoJSON output and size reduction statistics
  4. Use 'Convert Back to GeoJSON' to verify the conversion

About TopoJSON

TopoJSON is an extension of GeoJSON that encodes topology. Instead of representing geometries discretely, TopoJSON encodes shared boundaries between adjacent geometries (arcs), which dramatically reduces file sizes. This makes TopoJSON ideal for web applications where bandwidth matters. TopoJSON files are typically 80% smaller than equivalent GeoJSON files.