Universal Config Converter
Convert between .properties, JSON, and YAML formats instantly. 100% client-side.
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Your files never leave your computer — processed in-browser with WebAssembly.
No queues, no uploads — results in milliseconds, even on mobile.
Clean interface, dark mode, and no popups — built to beat legacy tools.
What you get
- Convert between JSON, YAML, and Properties
- Real-time syntax validation
- Export and copy with one click
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Frequently asked questions
The Universal Config Converter currently supports conversion between Java .properties files, JSON, and YAML formats.
Yes, absolutely. The conversion happens entirely on the client-side (in your browser). We do not send, store, or log any of your configuration data.
When converting nested JSON/YAML to .properties, the tool flattens the structure. However, our current simple parser focuses on direct key-value mappings. Complex nested arrays might lose context in .properties format.
Our parser treats .properties as a flat map. It will generate a flat JSON object where the keys exactly match the .properties keys (e.g., `"database.host": "localhost"`).
The tool validates your input in real-time. If the JSON or YAML is malformed, you will see an error message in the output panel indicating an 'Invalid Syntax'.
Yes! Once the conversion is successful, you can click the 'Download' button to save the output as a `.json`, `.yml`, or `.properties` file directly to your device.
No, standard JSON does not support comments, and our parser strips out `#` or `!` comments from .properties and YAML files during the conversion process.
The converter automatically detects numbers and unquoted 'true'/'false' strings in .properties and converts them into native Number and Boolean types in JSON/YAML.
The Swap button allows you to instantly reverse the conversion direction. It sets your Target format as the new Source, and your Output text as the new Input.
Since everything runs in the browser, the limit depends on your device's memory. Generally, files up to a few megabytes will convert instantly without issues.