Repair a broken activity file

Garmin Connect is fussier than most platforms about how a TCX or GPX file is put together. Garmin's own TCX schema expects XML elements in a specific order, and Garmin Connect's importer isn't always forgiving when that order is off — which happens more often than you'd expect with a file that's been hand-edited, exported by a third-party tool, or reassembled from another format. The result is a silent rejection, an error with no useful detail, or an import that technically succeeds but is missing laps or a chunk of the route. It's a frustrating problem because the file often looks completely normal if you open it in a text editor. FitFileHub's repair tool checks the things that actually cause this: a corrupted or malformed header (common after a file has been through another converter, and something Garmin Connect will refuse outright), out-of-order or missing timestamps, and duplicate points — all of which can distort the structure Garmin Connect expects to parse cleanly. It shows you exactly what it found before changing anything, so you're not guessing which part of the file was the problem. If you need the output specifically as TCX, FitFileHub's writer follows Garmin's expected element ordering, which sidesteps the structural mismatch that trips up hand-rolled or loosely-generated TCX files in the first place. Everything happens locally in your browser — the file with your GPS route never gets uploaded to fix it, which matters if you're already wary of bouncing a file between random online converters just to get it into Garmin Connect. Free for files up to 25 MB, three at a time.