This page was sparked in a booth at a busy restaurant. A table next to me was venting about “getting GPX from a watch into a clean map and spreadsheet”, fighting with KML exports, and reformatting CSV columns by hand. I went home and built the tool I wished they had: load, map, analyze splits, and export — all privately in your browser, with no uploads or tracking.
Bring your own GPX/TCX/KML/CSV/XLSX — the map preview, stats, and exports happen locally on your device.
| Format | Best for | Pros | Watch outs |
|---|---|---|---|
| GPX | Universal tracks | Simple XML; widely supported | Large files for dense tracks |
| KML | Google Earth | Styled lines & placemarks | Heavier XML; style varies by app |
| TCX | Fitness workouts | Laps, HR, cadence support | Support varies vs GPX |
| CSV/XLSX | Analysis | Pivot/filter in spreadsheets | Needs correct field mapping |
Total distance, duration, average pace/speed, elevation change. Units toggle between km/mi.
Per-km/mi time with cumulative distance. Use it to spot surges, slowdowns, or hills.
My CSV won’t map. Ensure columns are mapped (lat/lon). Check decimals and no stray headers.
Times look wrong. Set the correct time format (ISO/Excel/Unix). Confirm timezone if comparing devices.
Big files feel slow. Close heavy tabs; consider splitting routes or downsampling points.
Do my files upload? No — everything runs locally in your browser.