What can I use trimming for?

Removing a warm-up before the real effort, idle time at a stop light, or a stretch you forgot to stop recording at the end of an activity.

Are distances and laps recalculated?

Yes. After trimming, the distance is rebased to zero at the new start and lap totals are recomputed from the kept points.

Are my files uploaded to a server?

No. Trimming happens entirely in your browser. Your file never leaves your device.

Trim an activity file

Crop the start and end of a GPX, FIT or TCX activity — drag the sliders to keep only the part you want, then export. Useful for removing a warm-up, a forgotten stop or idle time. Everything stays in your browser.

Drop a file or click to browseGPX, FIT or TCX — processed in your browser, never uploaded

How to trim an activity

1
Select your file
Drop your .gpx, .fit or .tcx file onto the tool, or click to browse your device.
2
Drag the start and end sliders
Move the two sliders to keep only the portion you want. The map and stats update live.
3
Download the trimmed file
Pick an output format and download the cropped activity. Distances and laps are recomputed for you.

Frequently asked questions

What can I use trimming for?: Removing a warm-up before the real effort, idle time at a stop light, or a stretch you forgot to stop recording at the end of an activity.
Are distances and laps recalculated?: Yes. After trimming, the distance is rebased to zero at the new start and lap totals are recomputed from the kept points.
Are my files uploaded to a server?: No. Trimming happens entirely in your browser. Your file never leaves your device.