FIT File Editor
Make conservative edits to a FIT activity without uploading it. V3 currently supports sport-type changes and automatically rebuilds affected checksums.
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 |
|---|
Why the editor is intentionally conservative
FIT files are structured binary records. Arbitrary changes to timestamps, distances or definitions can make a file internally inconsistent. ActivityDoctor exposes edits only when it can locate and rewrite the underlying FIT field deterministically.
Need to repair bad samples?
Use Smart Repair on the Diagnosis tab for conservative timestamp, GPS, heart-rate, cadence, power and elevation anomaly handling.