KUON GNSS Track Converter
Convert GNSS logs and tracks to GPX / KML / GeoJSON / CSV: free, no account, in your browser.
Position-track conversion, fully in your browser: the file is processed only on this device and nothing is uploaded. The input format is auto-detected.
Convert raw logs to RINEX ・ Inspect a RINEX file ・ all tools ・ KUON MAP
What each format is for
GPX is the common exchange format for position tracks. Hiking apps, bike computers, car navigation and loggers all read and write it. If you want to keep a record, keep it as GPX.
KML is what Google Earth and Google My Maps read. It carries how a line should look, so it is the right choice when the goal is to show something on a map.
GeoJSON is the format most web maps and GIS tools accept directly. Choose it when the next step is code.
CSV is a plain table. Choose it when you want to compute distance or speed in a spreadsheet.
NMEA and .ubx are what receivers actually emit. They hold more than position, but no map will open them as they are.
Turning a GPX into a KML
Drop the file, choose KML, convert. That is the whole procedure.
One thing to know: a GPX file can hold three different things. A track is where you actually went, a route is where you plan to go, and a waypoint is a single place. When an import fails somewhere else, this distinction is usually the reason.
Why this runs in your browser
A position track shows exactly where you have been. That is not a file to hand to a stranger without thinking.
This tool never uploads. The conversion happens on your own machine, and closing the tab is enough to be rid of it.
When it does not work
Nothing comes out: the file may hold only waypoints, or the receiver may have logged without ever fixing a position. Open it in a text editor and look.
The track is broken into pieces: the receiver lost lock. That is in the data, not in the conversion.
Too many points: a one-second log over several hours runs into the limits of some apps. Thinning to one point every five seconds changes almost nothing on a map.