Repair a GPX file online

How it works

1. Open your file. Drop a GPX (or FIT, TCX, KML, KMZ) into the viewer — it's read in your browser, never uploaded.
2. Read the health check. A health score and a plain-English list of any problems appears automatically, each with the evidence.
3. Apply a fix. Each issue has a one-click fix: remove GPS jumps, make timestamps increase, smooth a noisy elevation profile, simplify an oversized file, or redact the start and end.
4. Undo anything. Every fix is reversible with full undo and redo.
5. Download the repaired file. Export a clean GPX 1.1 — your track structure, waypoints and Garmin extensions are preserved.

What the health check finds

• GPS jumps — points that imply impossible speeds, which wreck distance and max-speed.
• Timestamp problems — times that go backwards, repeat, or sit before 1990 (a device-clock error), and long recording gaps.
• Elevation issues — abrupt barometric spikes, or an all-zero profile from a lossy import.
• Stationary clouds — a run of points where the recording sat still (a stop, or drift while parked).
• Sensor spikes — implausible heart-rate, cadence, power or temperature readings.
• Size & shape — files too large for some devices, or too sparse to be accurate.
• Privacy — a track that begins and ends in the same place (often home), which you can redact before sharing.

Honest limits

This is a diagnosis-and-cleanup workshop, not a magic wand. It never invents data: it won't fabricate a missing heart-rate stream or guess an elevation it doesn't have. Where a problem can't be repaired safely it is flagged, not silently changed. And it isn't a route planner — for drawing or rerouting, use a planning tool, then bring the result back here to check and tidy.

Frequently asked questions

Is the GPX repair tool free and private?

Yes. It's free with no account, and the analysis and repairs run entirely in your browser — your file is never uploaded. The health check even runs in a background worker so large files stay responsive.

What problems can it find and fix?

GPS jumps (impossible speeds), timestamps that go backwards or repeat, impossible dates, elevation spikes, all-zero elevation, stationary point clouds, recording gaps, sensor spikes, oversized/sparse files, and a track that starts and ends at the same place (often home). Most have a one-click fix.

What can't it do?

It never invents data. It won't fabricate missing sensor streams, and it flags — rather than silently guesses — problems it can't safely repair. It's a diagnosis-and-cleanup workshop, not a route planner.