Free online FIT to KMZ converter
Convert GPS activity FIT files into Google Earth-compatible KMZ route archives.
Convert FIT to KMZ online - free
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How it works
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Upload your .fit file
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Perform .fit to .kmz conversion
After successful file upload, click to convert when you are ready.
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How to convert fit to kmz file
- GPS navigation, maps, GIS
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What the FIT format is
FIT (Flexible and Interoperable Data Transfer) is a compact binary format used for fitness, cycling, running, and GPS activity records. Garmin devices and software create it most commonly, while devices and services from Wahoo, Bryton, Suunto, and other manufacturers may also export FIT files. A FIT file can contain track points, timestamps, elevation, speed, heart rate, cadence, power, laps, and device metadata.
FIT is optimized for recording and exchanging structured sensor data, not for direct display in mapping applications. Google Earth does not normally open FIT files as map overlays, so the route must be converted to KML or KMZ.
What the KMZ format is
KMZ is a ZIP archive containing a KML map file, normally named doc.kml. KML stores geographic features such as points, paths, placemarks, descriptions, styles, and image references. Google Earth and several GIS and mapping programs can open KMZ directly.
KMZ is useful for sharing a route as one file because it is smaller than uncompressed KML and can include related icons or images. For a FIT activity, the KMZ usually contains a line representing the recorded GPS track; sensor fields such as heart rate and power are not generally preserved as native KMZ data.
How to actually convert FIT to KMZ
Using GPSBabel on a computer
GPSBabel is a suitable desktop converter for reading FIT activity files and exporting KML. Install a current version, then run:
gpsbabel -i garmin_fit -f activity.fit -o kml -F doc.kml
zip route.kmz doc.kmlReplace activity.fit with the source filename. The first command creates KML; the second places doc.kml inside a KMZ archive. Open route.kmz in Google Earth to verify the track.
On Windows PowerShell, create the archive with:
Compress-Archive -Path doc.kml -DestinationPath route.zip
Rename-Item route.zip route.kmzIf GPSBabel reports an unknown input format, update it to a current release and confirm that the file is a standard activity FIT file rather than a proprietary export or a damaged download. GPSBabel installations may use a slightly different FIT format identifier; check the installed format list with:
gpsbabel -^3For a no-installation option, upload the FIT file to the free converter on 101convert.com, select KMZ as the output format, and download the generated file.
Quality and compatibility limitations
The resulting route can only be as accurate as the GPS positions stored in the FIT file. GPSBabel may omit unsupported FIT records, including detailed sensor measurements, training intervals, manufacturer-specific fields, and some lap information. A KMZ is primarily a geographic visualization, not a complete replacement for the original activity record.
Keep the original FIT file for future editing or analysis. If the route appears incomplete, inspect the FIT file in a fitness application first; pauses, indoor sections, missing GPS fixes, or a device that recorded only sensor data cannot be restored by conversion. When creating the archive manually, keep the main KML file at the archive root and name it doc.kml for the broadest Google Earth compatibility.
Note: This fit to kmz conversion record is incomplete, must be verified, and may contain inaccuracies. Please vote below whether you found this information helpful or not.
FIT vs KMZ: format comparison
How the FIT and KMZ formats compare on the properties that matter most for this conversion.
| Property | .FIT Flexible and Interoperable Data Transfer file | .KMZ Keyhole Markup Zip |
|---|---|---|
| Open standard | Partly open | Partly open |
| Compression | — | Lossless |
| Typical file size | Very small | Small |
| Opens in a web browser | No | No |
| Further editing | Not directly editable | Limited |
| Metadata support | Extensive | Extensive |
| Plain-text readable | No | No |
| Best used for | Data exchange | Data exchange |
| Introduced | 2008 | 2004 |
| Developer | Garmin Ltd. | Keyhole, Inc. / Google |
| MIME type | application/vnd.ant.fit | application/vnd.google-earth.kmz |
Frequently asked questions
Is the FIT to KMZ converter free?
Yes, converting FIT to KMZ on 101convert.com is completely free. No registration, email address or installation is required. If you need a higher file size limit or want to convert more files at once, see our plans.
How large can my FIT file be?
You can upload FIT files up to 50 MB and convert up to 20 files at once in a single batch.
What happens to my uploaded files?
Files are processed automatically and deleted from our servers within a few minutes after conversion. We never view or share your files.
Do I need to install any software to convert FIT to KMZ?
No. The FIT to KMZ conversion runs entirely online in your browser and works on Windows, Mac, Linux, Android and iPhone.
Did the conversion fail?
In most cases, the cause is an incorrect file format. Please upload a valid FIT file for this FIT to KMZ conversion. Occasionally, the issue may be on our side. We analyze recurring conversion failures and disable or fix the converter if we detect a defect.