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MapKmlTools

KML to GeoJSON Format Converter

Convert KML data to lightweight GeoJSON format. Free browser-based GIS converter with no upload required for data privacy.

Frequently Asked Questions

Is KML to GeoJSON free to use?

Yes, the conversion process is fully free.

Does KML to GeoJSON upload my files to a server?

No, the geometry transformation is local with no upload required.

What file formats does KML to GeoJSON support?

Supports KML/KMZ and converts them to standard GeoJSON.

Does it preserve ExtendedData?

Yes, all KML attributes are mapped to the properties field in GeoJSON.

Why convert KML to GeoJSON?

GeoJSON is the standard format for web mapping. Libraries like Leaflet, Mapbox GL JS, OpenLayers, and frameworks like React Map GL all use GeoJSON natively. KML is primarily for Google Earth. Converting to GeoJSON lets you use your map data on any web platform.

Is styling preserved in GeoJSON?

Basic styles (stroke color, fill color, line width) are preserved as properties in the GeoJSON output. Most web map renderers allow you to apply styles from these properties using expressions.

Is my data uploaded to your servers?

No. The conversion runs entirely in your browser using JavaScript. Your KML file never leaves your device.

What geometry types are supported?

All standard KML geometry types are supported: Points, LineStrings, Polygons, MultiGeometry, and nested folders. The output is a standard GeoJSON FeatureCollection.

What file size limits apply?

KML files up to 50MB are supported for conversion. The resulting GeoJSON is typically similar in size to the original KML since both are text formats.

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What is KML to GeoJSON?

GeoJSON is the standard format for web-based mapping. While Google Earth uses KML, libraries like Leaflet, Mapbox GL JS, and OpenLayers permit GeoJSON.

This tool parses your KML structure and converts it into a flat, usable GeoJSON FeatureCollection.

When Should You Use This Tool?

  • •You are building a web map and need data from Google Earth.
  • •You are importing data into QGIS or ArcGIS Online.
  • •You need to process map data in Python or JavaScript.

How to Use KML to GeoJSON

  1. Upload your KML/KMZ file.
  2. The map preview shows the data.
  3. Click 'Convert' to generate JSON.
  4. Copy the code or download the .geojson file.