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How to Convert KML to GEOJSON
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When Do You Need to Convert KML to GEOJSON?
GeoJSON is the format web maps and modern GIS tooling expect, and KML is what comes out of Google Earth. Converting KML to GeoJSON is the step before using that data in a web map, a script or an analysis workflow.
What Happens When You Convert KML to GEOJSON
GDAL reads the KML and writes GeoJSON. Points, lines and polygons convert directly, and coordinates stay in WGS84 longitude and latitude, which both formats use. KML's presentation features do not carry across, because GeoJSON is purely a data format with no styling: icons, colours, line widths, balloon templates and any embedded imagery are dropped. Extended data attributes become GeoJSON properties, and the name and description fields become ordinary properties too.
Worth knowing before you convert
Ground overlays, image tiles and 3D models embedded in a KML have no GeoJSON equivalent and are lost entirely.
About KML and GEOJSON
application/vnd.google-earth.kml+xml
KML is a markup language used to represent geographic data for visualization in tools like Google Earth. It supports placemarks, paths, polygons, and overlays, enabling rich geospatial presentations.
application/geo+json
Geographic data structure.
Conversion Notes
GIS format conversion preserves geometry and attribute data, but coordinate reference systems may differ between KML and GEOJSON. Our converter re-projects coordinates where needed. Complex curved geometries may be approximated as straight-line segments in formats that don't natively support them. Attribute field names may be truncated in legacy formats with character limits.
Frequently Asked Questions
No. GeoJSON stores geometry and attributes only, so icons, colours and balloon styling are dropped. Styling is applied by whatever renders the map.