YML to JSON Converter

Convert YML files to JSON free in your browser — no signup, no install, and the file is never uploaded to a server. JSON opens almost anywhere, so the result works where YML did not.

Completely free Files are never uploaded No signup required
Drop files or click to select
YML → JSON

What changes in this conversion

  • JSON opens almost everywhere, so the converted file will work on devices and programs that refused the original YML.
  • The data structure (objects, arrays, values) is preserved exactly — only the notation changes. Comments in the original file are not carried over.

How to use

  1. Add your YML file

    Drag the YML file onto the drop area above, or click it to pick a file from your device. You can add several files at once.

  2. Confirm JSON as the output

    JSON is already selected as the output format on this page. This format converts straight through with no extra settings.

  3. Run the conversion

    Press the convert button. Processing happens on your own device, so the time depends on your computer rather than a server queue.

  4. Download the JSON file

    When it finishes, download the JSON file. Converting multiple files gives you the option to download them together as a ZIP.

About these formats

YML YAML Data

Identical to YAML, written with a shortened three-letter extension. GitHub Actions and similar tools use this spelling.

Commonly used for GitHub Actions, Docker Compose

YML File format reference

JSON JSON Data

The de facto standard for exchanging data through web APIs. It is human-readable while remaining easy for programs to parse.

Commonly used for API responses, configuration files, data storage

JSON File format reference

Frequently asked questions

Is converting YML to JSON really free?

Yes. YML to JSON conversion is completely free with no signup, no watermark, and no daily limit on the free plan for ordinary use.

Are my YML files uploaded to a server?

No. The conversion runs entirely inside your browser using WebAssembly, so the YML file never leaves your device. That is also why it works without an internet connection once the page has loaded.

Does the JSON file get bigger than the YML?

It can go either way. Both formats are lossless, so nothing is thrown away — the size difference comes from how each one packs the same data.

Is there a file size limit for YML to JSON conversion?

The free plan handles files up to 200MB. Because processing happens on your own device, very large files depend on your computer's memory rather than a server quota.

Convert YML files to other formats

YML XML

Convert other formats to JSON

XML JSON YAML JSON

Data converter

What each file format is, what it is used for, and which formats it can be converted to.

Open converter Browse the full format reference