KML vs GPX: Which Format Should You Use?
Detailed comparison of KML vs GPX file formats. Learn the differences, when to use each for Google Earth and GPS devices, and how to convert between them.
Which is better, KML or GPX? Use KML for visualizing routes on Google Earth/Maps with custom styling. Use GPX for navigation on GPS devices and sharing data between fitness platforms. GPX is the universal standard for GPS data exchange.
If you have the wrong format, you can easily convert them:
- Convert KML to GPX (for GPS devices)
- Convert GPX to KML (for Google Earth)
Format Overview
| Feature | KML (Keyhole Markup Language) | GPX (GPS Exchange Format) |
|---|---|---|
| Primary Goal | Visualization & Styling | Data Exchange & Compatibility |
| Developer | Google (now OGC Standard) | Topografix |
| Best For | Google Earth, Google Maps | Garmin, Wahoo, Strava, Komoot |
| Data Focus | Appearance (Colors, Icons) | Sensor Data (Time, Elevation) |
| File Size | Can be large (verbose) | Typically compact |
Detailed Comparison
1. Compatibility
GPX is the winner for compatibility. Virtually every GPS device, fitness app, and mapping tool supports GPX import/export.
KML is supported primarily by Google products (Earth, Maps) and professional GIS software (ArcGIS, QGIS). Most handheld GPS units cannot read KML files directly.
2. Visualization
KML is the winner for visuals. It supports:
- Custom line colors and widths
- 3D polygons and extruded shapes
- Custom icons for placemarks
- Camera angles (tilt/heading)
- Ground overlays
GPX styling is extremely limited—usually just a simple line on a map.
3. Sensor Data
GPX is the winner for data. The GPX format has standard extensions for:
- Heart Rate
- Cadence
- Power (Watts)
- Temperature
KML can store this data in ExtendedData blocks, but very few applications know how to read it.
When to Use Which?
Use KML When:
- You want to view a route in Google Earth
- You need to style the map (colors, polygons)
- You are creating a presentation or map overlay
- You want to share a location with someone using Google Maps
Use GPX When:
- You are uploading a route to a Garmin/Wahoo device
- You are sharing an activity on Strava/Komoot
- You want to backup your fitness data
- You need to transfer data between different apps
Converting Between Formats
Since both formats are XML-based, converting between them is accurate and reliable.
KML to GPX
Essential if you've planned a route in Google Earth and want to ride/hike it. Tool: KML to GPX Converter
GPX to KML
Great for visualizing your recorded activities in 3D. Tool: GPX to KML Converter
Summary Table
| Scenario | Recommended Format |
|---|---|
| Hiking with handheld GPS | GPX |
| Virtual flyover of route | KML |
| Sharing ride on Strava | GPX |
| Creating custom Google Map | KML |
| Archiving fitness data | GPX (or FIT) |