New tool: cut a section out of the start, end, or middle of a GPX or FIT file.

Trim is the 9th tool in Stamptivity — for when your recording has a warmup, a stop at a red light, or a chunk at the end you don't want carried into an overlay, comparison, or analysis.

Drop in a GPX or FIT file, drag the trim handles over the map and elevation preview to mark the range you want to keep (or cut), and export the result. Like every other Stamptivity tool, it runs entirely in your browser — no upload, no account.