Are my KMZ 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 KMZ to TCX 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 KMZ to TCX lose quality?

KMZ and TCX 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 TCX files?

No installation is needed for the conversion itself — it runs in the browser you already have. Opening the TCX afterwards needs whatever software normally handles Training Center XML on your device.

KMZtoTCX

Convert KMZ to TCX

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

You can convert KMZ to TCX free and without an account: drop the file above and the TCX 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 KMZ and TCX are for

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

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

How to convert KMZ to TCX

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

KMZ vs TCX: what changes

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

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.

KMZ to TCX: common questions

Are my KMZ 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 KMZ to TCX 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 KMZ to TCX lose quality?: KMZ and TCX 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 TCX files?: No installation is needed for the conversion itself — it runs in the browser you already have. Opening the TCX afterwards needs whatever software normally handles Training Center XML on your device.