How to Merge Multiple GPX or FIT Files Into One

GPS devices and apps sometimes split a single activity across multiple files — a dropped connection, a device restart, a lunch stop where you paused recording. Other times you have separate stages of a multi-day route you want to stitch together. Either way, you end up with multiple files that logically belong as one.

Stamptivity's Merge tool combines any number of GPX or FIT files into a single unified GPX track — ordered by timestamp, no gaps.

When to Merge Activity Files

• Your GPS device paused or restarted mid-ride, creating two files
• You exported separate morning and afternoon sessions of a long day
• You're combining individual stages of a multi-day bikepacking route
• A group exported the same route from different devices and you want a single reference track
• You have overlapping segments and want a clean merged line

What the Merge Tool Does

• Accepts any mix of .gpx and .fit files
• Sorts all points across all files by timestamp
• Writes a single .gpx output with one continuous track
• Reports total distance and point count after merging

Step-by-Step

1. Get Your Files

Export the individual files from wherever your activities are stored:

• Strava — open each activity, click ⋯ → Export GPX
• Garmin Connect — open activity, gear icon (⚙) → Export to GPX
• Wahoo — connect ELEMNT via USB, copy files from the activities folder
• Komoot — open tour → Download GPX

2. Open the Merge Tool

Go to Stamptivity Merge and drop all your files at once onto the upload zone — or click to add them one by one.

The list shows each file's name and type. You can remove individual files before merging.

3. Merge

Click Merge and the tool combines all the tracks, sorted by timestamp.

You'll see a summary: total point count and approximate distance. Check these match your expectations before downloading.

4. Download or Upload to Strava

Click Download GPX to save the merged file.

If you want to log the merged activity on Strava, you can upload directly from the Merge tool without leaving the page — connect your Strava account once, and the upload goes straight to your Strava profile.

Tips

• Order doesn't matter — files are sorted by GPS timestamp, not the order you added them. Drop them all at once.
• If two files have overlapping time ranges, the merger keeps all points ordered chronologically — you may see a brief doubling of the track on a map, but the data is intact.
• After merging, drop the resulting GPX into Stamptivity Stamp to create a stats overlay image of the combined route.
• The merged GPX preserves heart rate, cadence, elevation, and speed data from the source files where available.

What If My Files Are FIT, Not GPX?

No conversion needed — the Merge tool accepts .fit files directly alongside .gpx files in the same batch. The output is always GPX, which is the most universally compatible format.