Merge FIT Files
Combine multiple FIT files into a single activity. Perfect for split recordings, multi-sport events, or sessions where your device stopped mid-activity.
Drag & drop your FIT files here
or click to browse — max 50 MB
FAQ
How do I combine two FIT files into one activity?
Upload your FIT files in the order you want them merged. The tool will detect timestamps and combine the data streams. If there are overlapping timestamps, you can choose to auto-trim the overlap.
Can I merge FIT files from different devices?
Yes. You can merge files from different devices, for example combining heart rate data from a chest strap with GPS data from a watch. The tool handles different data channels and sampling rates.
Why would I need to merge FIT files?
Common reasons include: your device stopped and restarted during an activity creating two files, you used multiple devices during a session, or you want to combine a multi-sport event into one file for Strava or Garmin Connect.