Convert GPX to FIT course.

Field notes

Why does my device want FIT?

Most Garmin devices only navigate FIT course files — a plain GPX track won’t show up. This tool writes a proper course: records with position, elevation, timing and cumulative distance, which is what the device’s climb and ETA screens are computed from.

How do I get it onto the device?

Either import the FIT into Garmin Connect (Training → Courses) and sync, or plug the device in over USB and drop the file straight into the Garmin/NewFiles folder — it appears under Courses on next boot. Wahoo: import via the ELEMNT app or drop into the routes folder.

My GPX has no timestamps — is that okay?

Yes, routes usually don’t. Timing is synthesized at a steady pace so the course is valid; navigation doesn’t use it for anything you’ll notice.

Is my data private?

Your file is never written to disk. It is parsed in memory, converted, sent back, and garbage-collected. No accounts, no tracking pixels, no “files are deleted after 24 hours” fine print — there is nothing to delete.