Convert GEOJSON files to TOPOJSON online for free. High-quality conversion with no registration required.
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.geojson,.GEOJSON (max 100MB)
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GeoJSON is the standard web-friendly format for geographic features, but it stores every polygon boundary independently, which can result in duplicated coordinates where polygons share borders. This redundancy increases file size significantly for dense datasets like census tracts or zip codes.
TopoJSON is an extension of GeoJSON that encodes topology explicitly, merging shared borders into single arcs and eliminating duplicate coordinates. This can reduce file sizes by 80% or more, making it ideal for large choropleth maps and D3.js visualizations.
Yes, GoConvertFile offers free conversion of GEOJSON to TOPOJSON for files up to 100MB. No registration required.
Most GEOJSON to TOPOJSON conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.
TOPOJSON is ideal for web choropleth maps, data visualization, boundary simplification. TopoJSON - efficient topology-based JSON format for geographic boundaries
Yes, converting GEOJSON to TOPOJSON uses lossy compression, which reduces file size by discarding some visual data. Set quality to 85-95% for a good balance of quality and file size.
TOPOJSON files are typically 50-80% smaller than GEOJSON files because TOPOJSON uses efficient lossy compression. The exact reduction depends on quality settings.
GeoJSON is the standard format for web-based geographic data, encoding points, lines, polygons, and feature collections in JavaScript Object Notation.
TopoJSON is an extension of GeoJSON that encodes topology, sharing boundary arcs between adjacent features to dramatically reduce file size for map data.
Reach for GEOJSON when your priority is web mapping, geospatial apis, data interchange — its uncompromising quality ensures every detail is preserved.
Reach for TOPOJSON when your priority is web choropleth maps, data visualization, boundary simplification — its efficient compression makes sharing fast and storage minimal.