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Convert KMZ to TopoJSON

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

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Upload your KMZ file and get TopoJSON output in seconds.

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About KMZ

KMZ is a compressed (zipped) version of KML files. It packages the KML document along with any referenced images, icons, or overlays into a single archive.

Extensions: .kmz

Software: Google Earth, Google Maps, QGIS, ArcGIS

Limitations: Same as KML (WGS 84 only). Requires extraction to edit the underlying KML.

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.

How to Convert KMZ to TopoJSON

Upload your KMZ file (.kmz)
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

How do I convert KMZ to TopoJSON?

Upload your KMZ 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.

Is the KMZ to TopoJSON 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 TopoJSON files?

TopoJSON files can be opened with D3.js, Mapbox, QGIS, GDAL/OGR and more.