ANALYZER

Run analyzer

Drop in a .fit or .gpx and it tries to pick out your reps and your fastest splits. Runs in the browser, nothing gets uploaded.

Drop a .fit or .gpx hereOR CLICK TO CHOOSE

OR TRY IT ON A REAL FILE

These are my own workouts with the GPS, the elevation, the real dates and the watch's serial number stripped out of them, so what is left is the power, the heart rate and the cadence, which is the part any of these tools reads anyway.

Where do I get one of these?

FROM STRAVA

Open the activity on strava.com - this only exists on the website, the phone app will not do it.
Hit the three dots at the top right of the activity, then Export Original.
Export Original is usually a .fit. Export GPX also works here and keeps heart rate and cadence.
If you would rather skip the clicking, strava.com/activities/<id>/export_original downloads it directly.

OR SKIP STRAVA ENTIRELY

Garmin Connect has the same thing under the gear icon on an activity, called Export Original. Plugging the watch in and pulling the file off it directly works as well, though I tend not to bother.

Whatever you upload stays in this tab. There is no server here to send it to.