twineconvert
Free · in-browser · no upload

Apple Health to JSON
Converter

Drop your Apple Health Export file. We'll convert it to JSON right here in your browser, your file never leaves your device.

Local

Drop your file here

or click to pick from your device

.zip / .xml
Nothing uploaded No file size cap Open source

How it works

Three steps. No upload, no signup.

  1. 1

    Drop your file

    Click the dropzone above or drag a Apple Health Export from your desktop. Files of any size, there's no upload, so there's no upload limit.

  2. 2

    Convert in your browser

    The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.

  3. 3

    Download

    Get your JSON the moment the conversion finishes. Convert another, or close the tab.

Files stay on your device

Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.

No file size limit

Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.

Free, no signup, no ads on conversions

No account required. No watermark on the output. No queue. Open source, every line of conversion code is public.

Formats involved

About Apple Health Export and JSON

Apple Health Export, Apple Health export.zip

Apple Health on iOS lets users export their entire health/fitness history as export.zip, heart rate samples, step counts, sleep stages, workouts, blood pressure, every recorded metric. Inside the zip is one big export.xml file (often hundreds of megabytes for multi-year users) listing every Record element. Quantified-self enthusiasts, researchers, and healthcare providers all want this data in CSV/JSON for analysis.

How to open

iOS Health app (where it originated). For analysis: convert export.xml to CSV/JSON and load into any spreadsheet/notebook (Excel, Pandas, R).

Full Apple Health Export format guide →
JSON, JavaScript Object Notation

JSON is a lightweight text format for structured data, nested objects, arrays, strings, numbers, booleans. It's the lingua franca of web APIs, configuration files, and data interchange between programs. Human-readable when formatted, machine-parseable in every programming language, and roughly half the size of equivalent XML.

How to open

Any text editor reads JSON. Browsers display .json files in a formatted tree view. VS Code and similar editors highlight syntax.

Full JSON format guide →

Related tools

Convert other files to JSON

Convert your Apple Health Export to other formats

How we compare

Apple Health → JSON vs the alternatives

FeatureUstwineconvertCloudConvertiLovePDFFreeConvertSmallpdf
Files uploaded to a server
Free file size limitNo limit1 GB200 MB1 GB5 GB
Free conversions per dayUnlimited10/dayLimitedLimited2/day
Signup required
Watermark on output
Open source
Works offline (after first load)

Last verified May 2026 from each competitor's pricing and FAQ pages. Limits and pricing change frequently.

FAQ

Common questions

Is this Apple Health → JSON converter really free?

Yes. No signup, no watermark, no daily file count limit. The entire engine is open source, you can read the conversion code on GitHub.

Where does my file go when I convert it?

Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.

What's the maximum file size?

Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.

Why convert Apple Health Export to JSON?

Health data export for analysis, backup, or healthcare provider sharing. API responses, configuration files, structured data interchange. The most common reason to convert is compatibility, JSON works in places where Apple Health Export doesn't, or vice versa.

How do I open a Apple Health Export file in the first place?

iOS Health app (where it originated). For analysis: convert export.xml to CSV/JSON and load into any spreadsheet/notebook (Excel, Pandas, R).

Does this work offline?

Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.

Can I convert multiple files at once?

Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.