SMARTFIT BY TOOLMITRAA

FIT File Tools for Repairing, Combining and Editing Activity Files

SmartFIT brings common FIT-file utilities into one non-destructive workspace. Open FIT, GPX or TCX activities, apply focused repairs or transformations, inspect the result and export a new file while keeping the original untouched.

Open SmartFIT Tool

Quick FIT repair tools

  • Time Adjuster and exact start-time setter
  • Corrupt Time Fixer for duplicate, backward or impossible timestamps
  • Break Remover for long recording gaps
  • Peak Remover for isolated HR, power, cadence, speed or elevation spikes
  • Section Remover with safe distance continuity rebuilding

Data and metadata tools

  • Field Merger for heart rate, power, cadence, GPS, speed, elevation and temperature
  • Field Stripper for removing selected standard streams
  • Power / sensor adjuster
  • Elevation Setter
  • Sport Changer
  • Device Changer using SmartFIT recorder presets

Combine, inspect and convert

  • Chronological File Combiner for split recordings
  • FIT Inspector for CRC, message counts and profile information
  • Start Extender using a detailed GPX segment
  • FIT export plus GPX, TCX, CSV and JSON conversion

Non-destructive by design

SmartFIT works on an in-memory copy and exports a new file. Structural tools use a clean FIT rebuild. Preserve Original mode remains available in the full editor for compatible edits where retaining unknown and developer-field bytes is possible.

Frequently asked questions

Does SmartFIT modify my original FIT file?

No. Tools operate on a copy in the browser and export a new file.

Can I merge heart rate or power from a second device?

Yes. Field Merger aligns source and target samples by timestamp within a configurable tolerance and can copy HR, power, cadence, GPS, speed, elevation or temperature.

Can SmartFIT remove long breaks or bad timestamp jumps?

Yes. Break Remover can compress long recording gaps, while Corrupt Time Fixer can repair duplicate/backward timestamps and optionally very large forward jumps.

Will every tool preserve proprietary FIT messages?

No. Structural changes require a clean rebuild. SmartFIT only claims byte preservation when Preserve Original reports a compatible edit in the full editor.

More SmartFIT tools

FIT Tools Suite · FIT File Editor · FIT File Repair · Smart FIT Generator · Cycling Activity Generator · Running Activity Generator · Cycling Route Builder · GPX to FIT · FIT Converter · Activity Analyzer · Activity Library · Athlete Twin · Personal Heatmap