Free online GEOJSON to KML converter

GeoJSON is a widely used JSON-based geospatial format for storing geographic features, their geometry, and properties. KML (Keyhole Markup Language) is an XML-based format used for displaying geographic data in tools such as Google Earth and many mapping applications. Converting GeoJSON to KML lets you move spatial data from web and GIS workflows into a format that is easier to visualize in Earth viewers and some desktop GIS tools.

Why convert GeoJSON to KML

GeoJSON is excellent for web mapping, APIs, and lightweight spatial data exchange. KML is better suited for map visualization, placemarks, paths, polygons, and sharing with Google Earth users. If you need to present geographic features with labels, styles, and folders in a familiar Earth-view format, KML is often the better target.

How the formats differ

GeoJSON stores features as JSON objects with geometry types such as Point, LineString, Polygon, and MultiPolygon. It is easy to read and integrate with JavaScript and GIS libraries. KML uses XML structure with elements like Placemark, LineString, Polygon, and Folder. KML also supports styling and hierarchical organization, which can be useful for map presentation.

Best software for conversion

The best all-around converter for GeoJSON to KML is GDAL/OGR, especially the ogr2ogr utility. It is reliable, free, and supports many spatial formats. For desktop users, QGIS is also an excellent choice because it can open GeoJSON and export to KML through a simple interface.

Recommended options:

• GDAL/ogr2ogr — best for batch conversion and automation
• QGIS — best for manual conversion and checking geometry
• MyGeodata Converter — convenient online option for quick conversions

How to convert with GDAL

Using GDAL, the conversion can be done from the command line with:

ogr2ogr -f KML output.kml input.geojson

This command reads the GeoJSON file and writes a KML file. If your data contains multiple layers or complex attributes, GDAL usually handles them well, though some properties may be simplified because KML has different field and styling capabilities.

How to convert with QGIS

In QGIS, open the GeoJSON file, then export it to KML using the layer export tools. A typical path is:

Layer → Export → Save Features As

Choose KML as the format, set the output filename, and confirm the coordinate reference system if needed. This method is useful when you want to inspect the data before exporting.

Important conversion notes

• Coordinate reference system matters: KML commonly uses WGS 84 geographic coordinates.
• Styling may change: GeoJSON styles are not directly preserved in the same way as KML styles.
• Attribute fields may be limited: some properties may not map perfectly between formats.
• Geometry support differs: most common geometry types convert well, but complex cases may need review.

When to use an online converter

An online converter is useful for small files and quick one-time tasks. However, for sensitive data, large datasets, or repeated workflows, GDAL or QGIS is safer and more dependable.

Summary

GeoJSON to KML conversion is straightforward when you use the right tool. For the best balance of accuracy, speed, and flexibility, GDAL/ogr2ogr is the top choice. If you prefer a visual workflow, QGIS is the best desktop alternative. After conversion, always verify the coordinate system, geometry, and styling in your KML viewer.