Is the KML to GeoJSON converter free to use?

Yes, the tool is completely free with no signup required, no usage limits, and no hidden costs. You can convert as many KML, KMZ, and GeoJSON files as you need. The tool works offline once the page is loaded, and there are no advertisements or interruptions.

Does it store my data?

No. This tool runs entirely in your browser. All KML parsing, GeoJSON parsing, KMZ decompression, and format conversion happens client-side. Your geographic data, coordinates, and placemark information never leave your device and are never sent to any server. This makes it safe to use with sensitive or proprietary datasets.

What formats are supported?

The tool supports three formats: KML (Keyhole Markup Language, an XML-based geographic format used by Google Earth), GeoJSON (a JSON-based geographic format used by web mapping libraries), and KMZ (a zipped KML file that may contain embedded images and other resources). You can convert between KML and GeoJSON bidirectionally, and extract GeoJSON from KMZ files.

Can I upload KMZ files?

Yes. Click the "Upload KML/KMZ" button and select a .kmz file. The tool uses JSZip to decompress the KMZ archive entirely in your browser, extracts the KML document inside (typically doc.kml), and converts it to GeoJSON. No server-side processing is involved.

Does it preserve all KML features?

The converter supports the most common KML geometry types: Points, LineStrings, Polygons, and MultiGeometry. Placemark names and descriptions are preserved as feature properties. KML-specific styling (icons, colors, line widths) is not transferred to GeoJSON, as GeoJSON does not have a native styling system — styling is typically handled by the mapping library that renders the GeoJSON.

Can I use the output with Google Earth?

Yes. When you convert GeoJSON to KML, the output is a valid KML document that can be opened directly in Google Earth, Google My Maps, or any other application that supports KML files. Simply download the .kml file and open it in Google Earth.

Can I use the output with Leaflet or Mapbox?

Yes. When you convert KML or KMZ to GeoJSON, the output is a standard GeoJSON FeatureCollection that works with all major web mapping libraries, including Leaflet, Mapbox, OpenLayers, D3.js, Turf.js, and Google Maps. GeoJSON is the native format for these libraries, so no additional processing is needed.

Does it work on mobile?

Yes. The tool is fully responsive and works on mobile phones, tablets, and desktop computers. The code editors adapt to smaller screens, and all conversion and file processing happens in the browser, so there are no server round-trips that could slow things down on mobile networks.

🛠️DevToolsHub

KML to GeoJSON Converter

Convert KML, KMZ to GeoJSON and GeoJSON to KML. 100% client-side, no uploads.

What are KML and GeoJSON?

KML (Keyhole Markup Language) is an XML-based format developed by Keyhole Inc. (later acquired by Google) for expressing geographic annotation and visualization. KML is the native format for Google Earth and is widely used for displaying geographic data in applications like Google Maps, Google Earth, and other GIS software. KML files can contain points, lines, polygons, 3D models, images, and styling information. KMZ is simply a zipped KML file (often with embedded images), which reduces file size and bundles resources together.

GeoJSON is an open standard format for encoding geographic data structures using JSON. It is the de facto standard for web mapping and is supported by every major mapping library, including Leaflet, Mapbox, D3.js, OpenLayers, Turf.js, and many others. GeoJSON supports points, lines, polygons, multi-part geometries, and collections of features, each with associated properties. Its JSON foundation makes it trivially easy to parse in any programming language and ideal for use in web APIs and JavaScript applications.

Converting between KML and GeoJSON bridges the gap between the Google Earth ecosystem (which uses KML) and the web mapping ecosystem (which uses GeoJSON). Whether you’re importing Google Earth data into a Leaflet map, exporting spatial data from a GIS pipeline into a web application, or migrating geographic annotations between systems, this converter handles the transformation accurately and instantly — all within your browser.

How to Use the KML ↔ GeoJSON Converter

KML to GeoJSON

Select KML → GeoJSON mode using the toggle at the top.
Paste your KML content into the input editor on the left, or click “Upload KML/KMZ” to load a .kml file directly from your device.
Click “Convert” to transform the KML into GeoJSON. The result appears in the output editor on the right.
Review the feature count and file size in the stats bar. Copy the output to your clipboard or download it as a .geojson file.

GeoJSON to KML

Select GeoJSON → KML mode using the toggle at the top.
Paste your GeoJSON content into the input editor, or upload a .geojson or .json file using the “Upload KML/KMZ” button (it accepts GeoJSON files too).
Click “Convert” to transform the GeoJSON into KML. The output is a valid KML document ready for Google Earth.
Download the result as a .kml file and open it in Google Earth or any KML-compatible application.

KMZ Files

Click “Upload KML/KMZ” and select a .kmz file.
The tool automatically unzips the KMZ in your browser (using JSZip), extracts the KML document inside, and converts it to GeoJSON.
The GeoJSON output appears in the output editor. Copy or download as needed.

Features

Bidirectional conversion— Convert KML to GeoJSON and GeoJSON to KML with a single toggle switch. The tool automatically detects geometry types (Point, LineString, Polygon, MultiGeometry) and handles them correctly.
KMZ support— Upload .kmz files and the tool will unzip them in your browser using JSZip, extract the KML document, and convert it to GeoJSON. No server processing required.
File upload— Load .kml, .kmz, .geojson, or .json files directly from your device. The tool auto-detects the format from the file extension and processes it accordingly.
Feature counting— The stats bar shows the number of features in the output, along with input and output file sizes, so you can verify the conversion at a glance.
Copy and download— Copy the output to your clipboard or download it as a file with the appropriate extension (.geojson or .kml) and MIME type.
Validation with helpful errors— Invalid KML or GeoJSON produces a clear error message explaining what went wrong, so you can fix the input without guessing.
100% client-side (privacy-first)— All parsing, conversion, and unzipping happens in your browser. Your geographic data never touches a server, making it safe for sensitive or proprietary datasets.
Dark mode support— Fully supports light and dark themes, automatically following your system preference.

KML vs GeoJSON: When to Use Each

Aspect	KML	GeoJSON
Format	XML-based	JSON-based
Primary use	Google Earth, GIS desktop apps	Web maps, APIs, JavaScript apps
File size	Larger (XML verbosity)	Smaller (JSON is compact)
Parsing	XML parser required	Native JSON.parse()
Styling	Built-in (icons, colors, labels)	External (handled by mapping library)
3D support	Yes (altitude, extrude, models)	Limited (coordinates can have Z)
Compressed form	KMZ (zipped KML + resources)	Not standard (can be gzipped)

Use Cases

Google Earth to web map: Export placemarks from Google Earth as KML, convert to GeoJSON, and load them into a Leaflet or Mapbox map on your website.
GIS data migration: Move geographic data between desktop GIS tools (which often export KML) and web-based mapping applications (which typically consume GeoJSON).
Web mapping with Leaflet/Mapbox: These libraries natively understand GeoJSON. Convert your KML data to GeoJSON to display it on web maps without any server-side processing.
Data analysis in JavaScript: GeoJSON is easy to parse and manipulate in JavaScript. Convert KML data to GeoJSON for use with Turf.js for spatial analysis, or with D3.js for data visualization.
API integration: Many REST APIs accept or return GeoJSON. Convert KML data to GeoJSON before sending it to an API, or convert GeoJSON responses to KML for Google Earth visualization.
KMZ extraction:Unzip KMZ files and extract the geographic data inside without needing desktop GIS software — all in your browser.

Privacy & Security

This tool processes everything entirely in your browser. KML parsing uses the browser’s built-in DOMParser API. GeoJSON parsing uses native JSON.parse(). KMZ decompression uses JSZip, which runs entirely in the browser. Your geographic data, coordinates, and placemark information never leave your device and are never transmitted to any server. This makes it safe to use with sensitive or proprietary geographic datasets.

Frequently Asked Questions