TopoJSON converter, in your browser.
Convert TopoJSON files to GeoJSON, KML, GPX and CSV and more, or turn other files into TopoJSON. Everything on this page is converted in your browser, so your files never leave your device.
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About TopoJSON
TopoJSON is an extension of GeoJSON that encodes shared borders once, as arcs, instead of repeating them in every neighbouring shape. Maps of countries or counties come out far smaller. Libraries such as D3 read it, and many general GIS tools need it converted first.
TopoJSON needs a library to unpack it, and not every GIS tool reads it. TopoJSON is much smaller than GeoJSON for adjacent regions.
- Stands for
- TopoJSON
- Type
- Geographic data
- Compression
- None (JSON text, topology-encoded)
- Introduced
- 2012, by Mike Bostock
- Opens in
- D3, Mapshaper, QGIS and web mapping libraries
- Best for
- Compact boundary maps for the web
- File extension
- .topojson
- MIME type
- application/topo+json
Questions
How do I open a TopoJSON file?
TopoJSON opens in: D3, Mapshaper, QGIS and web mapping libraries. If your device or app cannot open it, convert it to GeoJSON or KML above.
What can I convert TopoJSON to?
ToAny converts TopoJSON to GeoJSON, KML, GPX, CSV, WKT and KMZ.
What can I convert to TopoJSON?
ToAny creates TopoJSON files from GeoJSON, KML, KMZ, GPX, WKT and SHP.
Are my files uploaded?
No. Every TopoJSON conversion listed here runs inside your browser. The files stay on your device.
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