Can I cut out the middle, not just the start and end?

Yes. Drag across any section and cut it. Strava only trims the ends, which is why people use a separate tool for the middle.

Will Strava and Garmin Connect take the edited file?

Yes. You get a valid .fit file with the totals recalculated. Delete the original upload first so the activity doesn't show up twice.

Does the file get uploaded anywhere?

No. The edit happens in your browser, so the file stays on your computer.

Crop a FIT file

Open a .fit file, drag across the part you want to remove, and cut it. You can take off the start, the end, or a section from the middle. The totals are recalculated, so you get a clean file to upload again.

Open the editor Free, and nothing leaves your browser.

The FIT File Editor with a section of the ride selected on the timeline, ready to cut — Drag across a section on the timeline and cut it. The map and totals update with the edit.

What you can take out

A few minutes of standing around at the start or the end.
The drive home you forgot to stop recording.
A section from the middle, like a long stop or a wrong turn.
A stretch where the GPS jumped and added distance you didn't ride.

How it works

Open your file, or drag it onto the page.
Drag across the part you want to remove on the timeline.
Press Cut. The laps and totals update around the gap.
Export the file and upload it again.

Questions

Can I cut out the middle, not just the start and end?: Yes. Drag across any section and cut it. Strava only trims the ends, which is why people use a separate tool for the middle.
Will Strava and Garmin Connect take the edited file?: Yes. You get a valid .fit file with the totals recalculated. Delete the original upload first so the activity doesn't show up twice.
Does the file get uploaded anywhere?: No. The edit happens in your browser, so the file stays on your computer.
Is it free?: Yes, and there's no account.