Pick a climb, a sprint, a descent — and read elevation gain, pace, gradient and speed for that segment alone. Elsewhere you get the average of your whole outing. Here, you read the part that matters.
I wanted my numbers for one specific portion of my run — the climb of the last two kilometres, not the average of my three-hour outing.
No online analyser lets you isolate an arbitrary portion of a GPX track. They all show the total, or offer Strava segments already drawn by other runners — never my portion, the one that mattered on my outing.
I ended up coding the reader I was looking for. Here it is — open to all, no account, no upload.
Same GPX file, read differently.
Same measures as GPXchunk — but aggregated over the four-hour outing. The climb drowns in the flat return leg, the sprint in the warmup. No way to isolate the portion you care about.
Same measures — but recomputed for the segment you pick. Drag two handles on the profile or type the kilometre bounds: the thirteen numbers redraw instantly for that segment alone.
Thirteen measures drawn point by point from your GPX file — synchronised between map, elevation profile and selected segment.
Drag two handles on the profile — or click two points on the map — or type the kilometre bounds. The thirteen measures recompute live for the isolated segment. This is the feature no other online GPX reader offers.
Segment analysisThe terrain of the route, plotted from the altitude of each point. Click anywhere on the curve — the matching marker lights up instantly on the map.
Computed with a ±1 m GPS noise threshold. No more inflated values from altimeter micro-oscillations. This is the D+ shown by serious sports software — and it's what feeds km-effort, distance and climb fused into a single difficulty index.
On the selected segment: pace in min/mi, speed in mph, climbing speed in ft/h, average and max heart rate in bpm — from timestamped data. Haversine distance, not linear approximation.
Rolling 50 m average to absorb altitude noise. The gradient you feel, not the one you hallucinate.
Free tiles, overlaid track, two movable markers pinning the segment ends. Zoom, pan, popup — nothing superfluous.
A .gpx file exported from Garmin, Strava, Komoot, Suunto, Coros, Wahoo, Apple Watch, Polar… It stays in your browser, nothing is uploaded.
Drag the two profile handles, or click on the map, or type the kilometre bounds: the selection syncs across all three views.
Measures update live for the segment alone: distance, time, D+, D−, speed, pace, max altitude, min altitude, net gradient, V.A.M., average HR, max HR and km-effort.
Any discipline that leaves a GPS track. The readings adapt: a trail runner isolates a climb; a roadie, a final sprint; a hiker, a col crossing.
Your GPX file is never sent to a server. XML parsing, haversine distance, filtered elevation gain, Leaflet rendering: it all runs in your browser tab through the FileReader API. Your track never leaves your device — by architecture, not by promise.
The project is free and funded by Google AdSense slots. AdSense sets its own advertising cookies, framed by a consent banner.
You close the tab: your GPX file goes with it — because it never left your browser. Segments you analyse locally.
<trkpt>, <ele> and <time> tags are extracted for the track; <wpt> (named waypoints) appear as icons on the map with their name and description. Exports from Garmin Connect, Strava, Komoot, Suunto App, Coros, Wahoo SYSTM and Apple Workout work natively.Drop a GPX file, isolate the portion you care about. No sign-up required.
Open the analyser →