Are all FIT messages supported?

The main record, lap, session, and activity messages are supported. Vendor messages and developer fields are warned about and dropped.

How are FIT units converted?

FIT scale and offset are applied: elevation is meters, speed is meters per second, and distance is meters.

Header and data CRCs are checked. A mismatch never produces a partial result.

Choose a direction
Choose the direction between FIT and GeoJSON or CSV/TSV.
Enter input
Load FIT from a file. Paste or choose a file for GeoJSON and CSV/TSV.
Use the result
Review warnings, then copy text or download FIT.

FIT covers file_id, activity, session, lap, and record messages. Developer fields, vendor messages, M coordinates, and non-WGS84 CRS are unsupported.

Are all FIT messages supported?: The main record, lap, session, and activity messages are supported. Vendor messages and developer fields are warned about and dropped.
How are FIT units converted?: FIT scale and offset are applied: elevation is meters, speed is meters per second, and distance is meters.
Can a damaged FIT file be repaired?: Header and data CRCs are checked. A mismatch never produces a partial result.