Are my TCX files uploaded anywhere?

No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and watch that nothing is sent while the file converts.

Is converting TCX to KMZ free?

Yes, without a limit on how many files you convert and with no watermark on the result. Files up to 100 MB are covered by the free plan.

Does converting TCX to KMZ lose quality?

TCX and KMZ describe content in fundamentally different ways, so the conversion is a reconstruction rather than a copy. The result is faithful, but not byte-for-byte equivalent. Positions, elevation and timestamps are carried across. Sensor streams, styling and embedded imagery are not.

Do I need to install anything to open KMZ files?

No installation is needed for the conversion itself — it runs in the browser you already have. Opening the KMZ afterwards needs whatever software normally handles Zipped KML on your device.

TCXtoKMZ

Convert TCX to KMZ

Up to 3 files at once, 100 with Pro. Mixed formats are fine.

You can convert TCX to KMZ free and without an account: drop the file above and the KMZ is ready to download in a second or two. The conversion happens inside your own browser, so the file is never uploaded — it works on Windows, Mac, Linux, iPhone and Android, and keeps working with the network switched off.

What TCX and KMZ are for

Garmin training data — heart rate, laps and cadence alongside the track.

A KML file plus its images and icons, zipped into one file.

How to convert TCX to KMZ

Drop your TCX file onto this page, or click to pick one.
Choose KMZ as the target. The conversion runs inside your browser — the file is never uploaded.
Download the finished KMZ file.

TCX vs KMZ: what changes

TCX compared with KMZ
	TCX	KMZ
Full name	Training Center XML	Zipped KML
File extension	.tcx	.kmz
Media type	application/vnd.garmin.tcx+xml	application/vnd.google-earth.kmz

Quality: The result is a close reconstruction rather than an exact copy. Check it before relying on it.
Where it runs: This conversion runs inside your browser. Your file is never uploaded, and it works with the network disconnected.
What can be lost: Positions, elevation and timestamps are carried across. Sensor streams, styling and embedded imagery are not.

TCX to KMZ: common questions

Are my TCX files uploaded anywhere?: No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and watch that nothing is sent while the file converts.
Is converting TCX to KMZ free?: Yes, without a limit on how many files you convert and with no watermark on the result. Files up to 100 MB are covered by the free plan.
Does converting TCX to KMZ lose quality?: TCX and KMZ describe content in fundamentally different ways, so the conversion is a reconstruction rather than a copy. The result is faithful, but not byte-for-byte equivalent. Positions, elevation and timestamps are carried across. Sensor streams, styling and embedded imagery are not.
Do I need to install anything to open KMZ files?: No installation is needed for the conversion itself — it runs in the browser you already have. Opening the KMZ afterwards needs whatever software normally handles Zipped KML on your device.