GPX, KML & GeoJSON Converter

Route files come in several formats and every app wants a different one. Garmin, Strava and most GPS watches speak GPX; Google Earth and My Maps want KML or KMZ; web maps and code use GeoJSON; and a spreadsheet wants CSV. This converter reads any of them and writes any of them, keeping tracks, routes, waypoints, names, elevation and timestamps wherever the new format can hold them.

Before you download, you see what you’ve got: the route drawn from its own coordinates, start and finish marked, waypoints labelled, and the distance, climb, descent, duration and average pace worked out from the points. An elevation profile shows the hills. When a format can’t carry something — KML has no routes, GPX has no filled areas — the tool tells you in plain words rather than quietly dropping it.

Two extras make the file more useful. “Simplify the track” removes points that add nothing at the tolerance you choose, so an overloaded recording fits a device or a web map. “Reverse direction” turns a route round, mirroring the timestamps so it still runs forwards in time. Everything happens in your browser: your routes, which can show where you live, are never uploaded.

1. Tap “Choose route files” or drop GPX, KML, KMZ, GeoJSON or CSV files onto the box. “Try an example run” loads a sample.
2. Under “Convert to”, pick GPX, KML, GeoJSON or CSV. The preview and stats update straight away.
3. Optionally tick “Simplify the track” and set the tolerance in metres, or tick “Reverse direction”.
4. Read the “Good to know” notes for anything the new format can’t keep, and check the converted text.
5. Press Download (or “Download all” for several files as a ZIP), or “Copy text” to paste it somewhere.

• Reads GPX 1.0 and 1.1, KML (including Google’s gx:Track), zipped KMZ, GeoJSON and CSV with latitude and longitude columns.
• Writes GPX 1.1, KML 2.2, GeoJSON and CSV; any format to any other, several files at once.
• Keeps tracks with all their segments, routes, waypoints, names, descriptions, elevation and timestamps where the target allows.
• Says plainly what a format can’t carry, such as routes in KML or filled areas in GPX.
• Route preview drawn from the coordinates alone (no map tiles, nothing loaded from the internet), with a scale bar.
• Distance, climb, descent, height range, duration, average pace and point count, in kilometres or miles.
• Elevation profile along the distance travelled.
• Simplify (Douglas–Peucker, tolerance in metres) and reverse with mirrored timestamps.

• Simplify gently. 2–5 m keeps a walking or running track faithful; 10–20 m suits long rides and drives.
• Climb is counted only when height changes by 3 m or more, because GPS height jitters. That’s why it can be lower than an app that counts every wobble.
• For Google My Maps, convert to KML; for Strava or a Garmin device, GPX; for a web map such as Leaflet, GeoJSON.
• CSV is handy for spreadsheets. Converting a CSV back keeps lines and segments apart thanks to the line and segment columns.
• Sharing a route without revealing when you rode it? Convert to KML with “Keep times in KML” unticked: the line is kept, the times are not.