PRIVATE · RUNS IN YOUR BROWSER

Drop a GPX file.
See every metric.

View tracks from runs, rides, hikes, or drives — speed heat-zones, elevation profiles, an interactive speed chart, and animated replay. Your file is read in your browser and never uploaded.

Drop your .gpx, .fit, .tcx, .kml or .kmz file here

or click to browse

Try a sample: All 13 samples →

What GPX Viewer does

GPX Viewer is a free tool for opening, visualising and analysing GPS track files in your web browser. There is no account to create, no usage limit and no file-size paywall. Your file is read directly on your device with the W3C File API and parsed locally — it is never uploaded to a server. There is nothing to install, and it runs in both desktop and mobile browsers.

It opens GPX 1.0 and GPX 1.1 files — track points (trkpt) are used when present, and files with only route points (rtept) or waypoints (wpt) render too. It also reads FIT and TCX (the formats Garmin, Wahoo and COROS devices record), and KML and KMZ (the format Google Earth and Google My Maps use). Any loaded track can be exported back out as GPX, KML or KMZ, turned into a one-page PDF route report, or saved as PNG images. Tracks are drawn on Apple Maps through MapKit JS and coloured with speed heat-zones, so faster and slower sections stand out at a glance.

Below the map you get an elevation profile and an interactive speed chart, plus an animated replay that plays your track back from 0.5× to 50× speed with optional auto-rotate and auto-center camera modes. Distances, speeds and elevations can be shown in metric, imperial or nautical units, so the same track suits runners, cyclists, drivers and sailors alike. GPX Viewer detects the activity automatically — driving, cycling, running or hiking — and adapts its metrics and speed colours to match. It ships with matching dark and light themes.

GPX Viewer is made by bithaus.tech, the maker of speedometer.app, a GPS speedometer for iPhone.

How the metrics are computed

Distance

Distance is the cumulative sum of the great-circle (haversine) distance between each pair of consecutive track points, computed on a spherical Earth of radius 6,371 km.

Elevation gain and loss

Gain and loss are summed with a 2-metre hysteresis filter: a climb or descent only counts once the elevation has moved at least 2 m away from the last counted level. This suppresses the metre-to-metre GPS and barometric noise that would otherwise inflate the totals over a long track.

Duration

Duration is the elapsed time from the first timestamp to the last, pauses included. A track without timestamps shows no duration or speed — there is nothing to derive them from.

Average and maximum speed

Each point's speed is its distance from the previous point divided by the time between them. Average speed is the mean of those per-point speeds while moving — samples at rest are excluded, so it reflects moving speed rather than distance ÷ total time. Maximum speed is the highest single point-to-point value, so it is sensitive to GPS jitter — one stray fix can spike it.

Common questions

Is GPX Viewer free?

Yes. It is free with no account, no usage limits and no file-size paywall. It is made by bithaus.tech, the company behind speedometer.app.

Is my GPX file uploaded anywhere?

No. The file is read directly in your browser with the W3C File API and parsed locally. It never reaches our servers. Only anonymised usage analytics (page views, feature clicks) are collected — see the privacy policy.

Which files can I open?

GPX 1.0 and 1.1, FIT and TCX (the formats Garmin, Wahoo and COROS devices record), plus KML and KMZ (Google Earth / Google My Maps). Track points are preferred; files with only route points or waypoints also render. Once a track is loaded you can export it back out as GPX, KML or KMZ — so this also works as a FIT-to-GPX or TCX-to-GPX converter.

Why won't my file open?

Three common causes: the file isn't valid XML (open it in a text editor — a GPX starts with a <gpx> tag and a KML with a <kml> tag); the extension is wrong (rename .gpx.txt or .xml to .gpx); or it contains no location points at all.

How do I get a GPX file from Strava, Garmin or Apple Watch?

Strava: open the activity page → ⋯ → "Export GPX". Garmin Connect: open the activity → gear icon → "Export to GPX". Apple Watch: workout apps such as WorkOutDoors export GPX directly; Apple's own Fitness app needs a third-party exporter (for example a "Workouts to GPX" app).

Can I replay my track?

Yes — press play to watch an animated replay at 0.5× to 50× speed with live speed and elevation readouts and auto-rotate and auto-center camera modes.

Does it work in knots for sailing?

Yes. Switch units to nautical (kn) — useful for boat, sailing and kitesurf tracks.

Can I export a PDF report or images?

Yes. Use the Download menu to generate a one-page PDF route report — map with speed heat-zones, key stats, elevation and speed profiles, and per-split times, all in your chosen units — or save the map and charts as PNG images. Everything is generated in your browser; nothing is uploaded.

Can I edit a track?

Yes. Once a file is loaded, click Edit to trim, reverse, merge, split, smooth elevation, or rename the track. For a GPX file, click Points to change an individual track point's latitude or longitude, insert or delete points, and add or delete waypoints. Changes support undo and redo. Choose Edit points on map in the Points panel to drag a point, tap between points to insert, or delete a point, with a preview before applying. To draw a new route, choose Plan a route from scratch: tap the map to add anchors, drag them to move, delete anchors, close a loop, or retrace an out-and-back. Download the result as a GPX track or route. This planner connects anchors with straight lines, not roads or trails. Planning and export run in your browser and work offline once loaded; new background map tiles need a connection.

Can I share a track with a link?

Yes. Press Share and a link is copied to your clipboard. The track is encoded inside the link's #fragment, which browsers never send to a server — so the link contains the track itself and we never receive it. Very large tracks are simplified for the link (a downloaded GPX keeps the original).