Garmin's own Apple Health link only carries across about two weeks, then syncs forward. Your years of history stay stranded on the iPhone. Wearable Converter moves your full Apple Health daily history into Garmin Connect: steps, distance, calories, floors, exercise minutes, weight and body fat. It runs in your browser, and it removes the Watch plus iPhone double counting that wrecks naive conversions.
Apple Health logs the same metric from every device you own. Your Watch records your steps. Your iPhone records the same steps. The Health app quietly hides the overlap on screen, but the raw export contains every copy.
Add every record in a real 10-month export and you get 1.98 million steps. The scripts and generic converters floating around do exactly this.
The true figure was 62% lower. Import the naive number and your Garmin history is permanently wrong, every day inflated, every record suspect.
Wearable Converter totals each device separately per day, keeps the highest single source, and never adds two devices together. Third-party apps writing into HealthKit are handled the same way.
The native connection carries across roughly the last two weeks, then syncs new days forward. Everything older stays on the iPhone. Garmin Connect's importer accepts historical wellness data in exactly one format, and Apple's export.xml is not it. Wearable Converter reads your export, removes the device overlap, and writes precisely the files Garmin's importer accepts, split by year.
No cables, no companion apps, no uploads. If you can find the Health app, you can do this.
Open the Health app, tap your profile picture in the top right, scroll down and tap Export All Health Data, then confirm. Preparing can take a few minutes on big libraries. Save the resulting export.zip to Files, or AirDrop it to your computer.
Drop export.zip into Wearable Converter. It streams the file in your browser, so even multi-hundred-megabyte exports work, and nothing is uploaded anywhere. Watch and iPhone overlap is merged automatically. Exports over 200 MB convert best on a desktop browser.
Get Garmin-ready CSV files split by year: daily activity files plus a body composition file with weight, derived BMI, and body fat where your export contains it.
On a desktop browser, open connect.garmin.com, choose Import Data, and upload each file, oldest year first. Pick the same units and date format you chose in the converter when Garmin asks. Your history appears in Health Stats within about an hour.
Garmin Connect has hard limits on what historical data it accepts, from any platform. We convert everything it allows and we are upfront about the rest.
The same $9 licence covers Fitbit, Google Health, and Apple Health. Already bought Wearable Converter? Apple Health support is included with your existing key, at no extra cost.