Convert KML to GeoJSON
One feature per placemark, ExtendedData as properties.
Nothing is uploaded
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About this tool
One feature per placemark, ExtendedData as properties. Free, and the file never leaves your browser.
How the conversion works
- Choose a .kml file exported from Google Earth, Google My Maps or a GPS app, drop it here, or paste the KML text.
- Every Placemark becomes a Feature. Point, LineString and Polygon map one to one; a MultiGeometry of one kind becomes MultiPolygon or MultiLineString, a mixed one a GeometryCollection. Name, description, folder path, timestamp and every ExtendedData field go into properties.
- Download the .geojson. It drops straight into geojson.io, Leaflet, Mapbox GL, QGIS or a PostGIS import.
What the GeoJSON contains
A FeatureCollection as RFC 7946 defines it: WGS 84, longitude first, no crs member, coordinates rounded to 8 decimals.
| In the file | Where it comes from |
|---|---|
| geometry | The Placemark geometry with longitude, latitude and, when the KML has one, altitude as the third coordinate. |
| properties.name | The Placemark name. |
| properties.description | The Placemark description, HTML included, as one string. |
| properties.folder | The Folder names above the Placemark, joined with a slash, so the Google Earth tree survives the conversion. |
| properties.timestamp | TimeStamp, or the start of a TimeSpan. |
| properties.<field> | One property per ExtendedData field, Data and SchemaData spellings alike, as strings. |
What it does not do
- KMZ is a zip. Unzip it first and drop the doc.kml inside.
- Styles, icons and colours are not carried over. GeoJSON has no standard place for them; simplestyle properties are a convention this page does not invent.
- NetworkLink elements are not followed.
- ExtendedData values stay strings. A field holding 12 becomes "12", because KML does not say it is a number.
Frequently asked questions
Short answers to what people ask most.
Does my KML get uploaded?
No. The conversion runs in your browser tab. Open the network panel while you convert: no request carries the file.
Will the result load in Leaflet or Mapbox?
Yes. The output is a FeatureCollection with WGS 84 coordinates in longitude, latitude order, which is what L.geoJSON and a Mapbox GL geojson source expect.
Why does my polygon show as MultiPolygon?
Because the KML had a MultiGeometry with several Polygons inside. GeoJSON has an exact type for that. A MultiGeometry mixing points and lines becomes a GeometryCollection.
Are the altitudes kept?
Yes. A KML coordinate with a third value comes out as a three-element position. GeoJSON allows it; most web maps ignore it.
What about a Google My Maps export?
Google My Maps exports KMZ or KML. Choose KML, or unzip the KMZ. Each layer of the map is a Folder, so the layer name is in the folder property.