Convert TopoJSON to KML

Convert TopoJSON (.topojson, .json) to KML (.kml) online for free. Fast, accurate geospatial format conversion with CRS reprojection.

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Upload your TopoJSON file and get KML output in seconds.

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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.

Extensions: .topojson, .json

Software: D3.js, Mapbox, QGIS, GDAL/OGR, Leaflet

Limitations: Read-only in most GIS software. Requires conversion for editing. Less widely supported than GeoJSON.

About KML

Keyhole Markup Language (KML) is an XML-based format for displaying geographic data in Earth browsers like Google Earth. It supports styling, icons, and 3D features.

Extensions: .kml

Software: Google Earth, Google Maps, QGIS, ArcGIS, Cesium

Limitations: Requires WGS 84 (EPSG:4326). Can become very large for complex datasets. Limited attribute handling.

How to Convert TopoJSON to KML

Upload your TopoJSON file (.topojson, .json)
Review detected layers, features, and coordinate system
Select KML as your output format
Choose a target coordinate reference system (optional)
Click Convert and download your KML file

Frequently Asked Questions

How do I convert TopoJSON to KML?

Upload your TopoJSON file to ConvertGeoData, review the detected data, select KML as the output format, and click Convert. Your converted file will be ready to download in seconds.

Is the TopoJSON to KML conversion free?

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.

Can I change the coordinate system during conversion?

Yes. ConvertGeoData automatically detects your source CRS and lets you reproject to any EPSG coordinate reference system during conversion.

What software can open KML files?

KML files can be opened with Google Earth, Google Maps, QGIS, ArcGIS and more.

Does KML support different coordinate systems?

KML requires EPSG:4326. ConvertGeoData automatically reprojects your data to the correct CRS.