Convert GeoJSON to KML Online — Free GIS Converter

GeoJSON powers modern web maps, but when you need to share geographic data with Google Earth, embed a map in Google My Maps, or hand off features to a client who works primarily in the Google ecosystem, KML is the format of choice — convert your .geojson file to .kml instantly with geodata.plus.

Why convert GeoJSON to KML?

KML is the native format for Google Earth and Google My Maps, making it the right choice when your audience uses those tools to visualize geographic data. While GeoJSON is ideal for programmatic consumption and web map libraries, KML supports embedded styling — colors, icons, line weights, and pop-up balloons — that makes features visually meaningful when opened directly in Google Earth without any additional configuration. If you are preparing a presentation, a field survey handoff, or a public-facing map story, KML's built-in symbology support makes the output immediately usable.

KML is also the standard interchange format for many mobile GPS apps and aviation charting tools, so this conversion is often the last step before distributing data to non-GIS users who just need to open a file and see something meaningful.

Why use geodata.plus

• Free tier — convert up to 3 files per month at no cost, no credit card required
• Automatic CRS detection — GeoJSON is always WGS 84; geodata.plus confirms this and sets KML coordinates correctly
• Optional reprojection — reproject to any EPSG code if your source data deviates from the RFC 7946 standard
• Browser-based — no QGIS, GDAL, or Google Earth Pro install needed; works on any modern browser
• Encrypted transfer — all uploads use TLS; files are stored temporarily in Cloudflare R2 and automatically deleted on schedule
• Auto-deleted output — output files are automatically deleted after 2 days (free tier) and 7 days (Pro); no manual cleanup needed

How it works

1. Upload your GeoJSON file (.geojson or .json) using the widget above
2. geodata.plus detects the format and confirms the coordinate reference system (WGS 84 / EPSG:4326)
3. Select KML as the output format
4. Download your .kml file, ready to open in Google Earth or import into Google My Maps

GeoJSON format

GeoJSON is an open standard (RFC 7946) for encoding geographic data structures using JSON. Every GeoJSON file uses WGS 84 (EPSG:4326) as its coordinate reference system — this is mandated by the specification, not just a convention. Features carry arbitrary key-value properties alongside their geometry, making GeoJSON well-suited for API responses and web map data layers.

| Property | Value | |---|---| | Extension | .geojson, .json | | Type | Vector, single file | | Coordinate system | Always WGS 84 (EPSG:4326) | | Geometry types | Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon | | Common software | Leaflet, Mapbox, OpenLayers, QGIS, ArcGIS, GitHub |

KML format

KML (Keyhole Markup Language) is an XML-based format originally developed by Keyhole Inc. and later acquired by Google, which donated it to the OGC as an open standard. KML files describe geographic features using XML tags and can include style definitions, camera viewpoints, network links to remote data, and screen overlays — features that make it much richer than a plain geometry exchange format. KML always uses WGS 84 coordinates (longitude, latitude, optional altitude).

| Property | Value | |---|---| | Extension | .kml | | Type | Vector, single file XML | | Coordinate system | Always WGS 84 (EPSG:4326) | | Geometry types | Point, LineString, Polygon, MultiGeometry | | Common software | Google Earth, Google Maps, ArcGIS, QGIS, many GPS/mobile apps |

Frequently asked questions

Will my GeoJSON properties appear as pop-up information in Google Earth?

Yes. geodata.plus maps GeoJSON feature properties to KML <ExtendedData> elements, which Google Earth displays in a balloon pop-up when you click a feature. All key-value pairs from your GeoJSON properties object are preserved as named data fields.

Does the KML output include any styling from my GeoJSON?

GeoJSON does not have a native styling specification, so source files typically contain no style information. The output KML will use Google Earth's default styles. If you need custom colors or icons, you can open the KML in Google Earth and apply styles manually, or use a tool like QGIS to assign symbology before export.

Can KML represent MultiPolygon or MultiLineString geometries from GeoJSON?

Yes. KML's <MultiGeometry> element wraps multiple geometry parts, so GeoJSON MultiPolygon, MultiLineString, and MultiPoint features are converted to <MultiGeometry> Placemarks. The geometry is preserved accurately; only the element name differs between the two formats.