FIT file guides

The problems that bring most people here, each with the fix. Every guide ends in the editor, which is free and keeps your file on your computer.

• How to Delete Part of a Strava Activity (Including the Middle)
  Strava only trims the start and end of an activity. Here is how to cut a section from the middle of a ride or run, keep the rest, and re-upload it cleanly.
• Garmin Died Mid-Ride or Mid-Run? How to Merge the Two Files Into One Activity
  Your watch or bike computer died partway and you started a second recording. Here is how to combine both FIT files into one continuous activity for Strava or Garmin Connect.
• FIT File Won't Upload to Strava or Garmin Connect: How to Fix It
  A FIT file that is rejected on upload is usually truncated, corrupt, or not an activity at all. Here is how to tell which, and how to repair it in your browser.
• Garmin Connect Says Duplicate Activity After Editing a FIT File: How to Fix It
  Edited a FIT file and Garmin Connect or Strava rejected the upload as a duplicate? Here is why it happens and the order of steps that gets the edited file accepted.
• How to Fix a Heart Rate Spike in a Garmin or Wahoo FIT File
  A heart rate of 220 for the first ten minutes is a dry strap, not your heart. Here is how to cap or smooth the spike in the file so your averages and training load are right.
• FIT vs GPX vs TCX: Which Activity File Format to Use
  The three formats every watch, bike computer, and training platform speak, what each one actually holds, and which one to export or upload for a given job.
• How to Edit a FIT File on a Mac (No Software to Install)
  Most FIT editing tools are Windows-only. Here is how to crop, fix, merge, and repair a FIT file on macOS in Safari or Chrome, with nothing to install and nothing uploaded.
• Forgot to Stop Your Garmin? How to Remove the Drive Home From an Activity
  Your watch or bike computer kept recording in the car, on the train, or at the café. Here is how to cut that part out of the FIT file so the distance, speed, and averages are right again.
• How to Edit a Wahoo ELEMNT FIT File: Export, Fix, and Re-Upload
  Get the original .fit file out of the Wahoo app or off an ELEMNT, BOLT, ROAM, or ACE, crop it, cut a section, merge or fix the data, and upload the clean version to Strava, Garmin Connect, or TrainingPeaks.
• How to Export and Edit a COROS FIT File
  Export the .fit file from the COROS app or Training Hub, cut any section, merge a split run, fix heart rate spikes, and re-upload to Strava, COROS, Garmin Connect, or TrainingPeaks.
• How to Download and Edit a Zwift FIT File
  Download the .fit file for a Zwift ride or run, fix power spikes, merge a ride split by a crash, combine it with your watch's heart rate, and upload the result to Strava, Garmin Connect, or TrainingPeaks.
• How to Get a FIT File From an Apple Watch Workout (and Edit It)
  The Apple Watch doesn't save workouts as .fit files. Here is how to get one through a third-party app or Strava, crop it, fix heart rate, combine it with a bike computer, and upload it anywhere.
• How to Fix GPS Drift or a Jumpy Track in a FIT File
  A track that zigzags through buildings, cuts across a park, or jumps a block sideways can be fixed in the file. Here is how to smooth the bad stretch, drag a stray point back onto the road, or delete it.
• How to Add Heart Rate From Your Watch to a Bike Computer Ride
  Your bike computer recorded the ride and power, but the heart rate is on your watch. Here is how to combine the two FIT files into one activity with both, and upload it in place of the two copies.
• How to Change the Date or Time of a Strava Activity
  Strava can't edit the date or start time of a recorded activity. Here is how to shift the time in the original file and upload it again, for a watch with the wrong clock, an indoor workout in the wrong time zone, or a ride filed under the wrong year.

Looking for a specific job? Crop a FIT file, Merge FIT files, Combine two devices, Fix FIT file data, Repair a FIT file, Change the device, Adjust the time, Change the sport, browse the guides, or read the FIT format reference.