FIT File Viewer
Open a Garmin-compatible FIT activity directly in your browser. Inspect route, activity statistics and sensor charts without sending the workout file to a server.
Drop your .FIT file here
Analysis runs locally in a Web Worker. Your workout file is not uploaded.
FIT health report
Activity stats
Average heart rate —
Max heart rate —
Average cadence —
Average power —
Private route map
Vector-only track visualization. No map tiles or GPS coordinates are requested from a third-party map service.
Recovery estimate
Repair & recovery options
Detected anomalies
Activity record sample
The interface downsamples very large activities for display. Repair logic works from the complete local file.
| # | Time | HR | km/h | Altitude | Cadence | Power |
|---|
What the FIT viewer shows
ActivityDoctor decodes common Activity messages and presents GPS, timestamps, heart rate, speed, elevation, cadence and power when those streams exist in the source file. Large files are downsampled only for visual display; the original stays unchanged.
Does this upload my route?
No. The FIT parser runs locally, and the route is rendered as a private vector track rather than fetching third-party map tiles.