Convert GeoJSON to TopoJSON
Convert GeoJSON (.geojson, .json) to TopoJSON (.topojson, .json) online for free. Fast, accurate geospatial format conversion with CRS reprojection.
About GeoJSON
GeoJSON is an open standard format for encoding geographic data structures using JSON. It supports points, lines, polygons, and multi-part geometries along with feature properties.
About TopoJSON
TopoJSON is an extension of GeoJSON that encodes topology, eliminating redundancy and reducing file size. Shared boundaries between features are stored only once.
How to Convert GeoJSON to TopoJSON
- Upload your GeoJSON file (.geojson, .json)
- Review detected layers, features, and coordinate system
- Select TopoJSON as your output format
- Choose a target coordinate reference system (optional)
- Click Convert and download your TopoJSON file
Frequently Asked Questions
Upload your GeoJSON file to ConvertGeoData, review the detected data, select TopoJSON as the output format, and click Convert. Your converted file will be ready to download in seconds.
Yes! ConvertGeoData offers free conversions for all users. No account required for basic conversions. Sign up for a Pro or Business plan for higher limits.
Yes. ConvertGeoData automatically detects your source CRS and lets you reproject to any EPSG coordinate reference system during conversion.
TopoJSON files can be opened with D3.js, Mapbox, QGIS, GDAL/OGR and more.
Convert GeoJSON to TopoJSON Now
No installation required. Works in your browser.