KML to GeoJSON - Convert Google Earth Data

Convert KML files from Google Earth to GeoJSON for web mapping. Extract points, lines, and polygons. In-browser processing, your eyes only.

Input KML

Drop KML file here or click to browse

Or paste KML content

Output GeoJSON

About KML to GeoJSON Conversion

KML (Keyhole Markup Language) is the native format for Google Earth, widely used for storing geographic annotations, routes, and boundaries. GeoJSON is the modern standard for web mapping, offering simpler syntax and native JavaScript support.

This converter extracts all geographic features from your KML file and transforms them into a GeoJSON FeatureCollection. Use it to migrate Google Earth data to web mapping platforms like Leaflet, Mapbox, or OpenLayers.

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Frequently Asked Questions

KML (Keyhole Markup Language) is an XML-based format used by Google Earth and Google Maps to display geographic data. It stores locations, routes, boundaries, and 3D models with styling information. Originally developed by Keyhole Inc., it became a standard format for sharing geographic data across different mapping applications.

GeoJSON is the standard format for modern web mapping libraries like Leaflet, Mapbox GL JS, and OpenLayers. It's simpler, more compact, and natively supported by JavaScript. Converting KML to GeoJSON allows you to use Google Earth data in web applications without complex parsing libraries or server-side processing.

This converter supports Points (markers), LineStrings (paths and routes), Polygons (areas and boundaries), MultiGeometry collections, and coordinate arrays. It extracts latitude, longitude, and optional altitude values from KML elements and converts them to proper GeoJSON coordinate format.

KML styling (colors, icons, line widths, transparency) is not directly preserved in GeoJSON conversion because GeoJSON focuses on geometry and properties, not presentation. However, style identifiers and descriptions are retained as properties, allowing you to reapply styling in your web mapping library using the preserved metadata.

KMZ files are compressed KML archives (ZIP format) that may contain images and other resources. This browser-based tool works with uncompressed KML files only. To convert KMZ, first extract the .kml file from the archive using any ZIP utility, then use this converter on the extracted KML file.

KML uses longitude, latitude, altitude order (lng,lat,alt), which matches GeoJSON's coordinate order. The converter preserves this ordering and properly handles coordinate strings, trimming whitespace and parsing elevation data when present. Three-dimensional coordinates are maintained in the output GeoJSON.

Yes, the converter processes files entirely in your browser using efficient DOM parsing and JSON serialization. Files with thousands of placemarks can be handled, though very large files (10MB+) may take a few seconds to process. There's no server upload limit since everything runs locally.

Absolutely. All conversion happens in your browser using JavaScript. No data is uploaded to any server. Your KML files, coordinates, and generated GeoJSON never leave your device. You can even use this tool offline after the page loads initially.

The converter extracts placemark names, descriptions, coordinate data, and geometry types. These become GeoJSON properties and geometries. Folder structures are flattened, but names and descriptions from nested elements are preserved, allowing you to maintain essential metadata for each feature.

Yes, the generated GeoJSON works directly with all major web mapping libraries. For Leaflet, use L.geoJSON(data). For Mapbox GL JS, add it as a GeoJSON source. The standard format ensures compatibility without additional processing or conversion steps.

Input KML

Output GeoJSON

About KML to GeoJSON Conversion

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