Playground

Pick a source or config preset, then format. The Share button stores the current source and config in the URL.

Formatted Output

What you can do here

The playground runs the same Rust formatter as the CLI, compiled to WebAssembly and executed entirely in your browser. Nothing is sent to a server.

Source presets — pick a starter snippet from the dropdown to explore common formatter scenarios (long argument lists, comment reflow, custom keyword groupings, etc.).
Config presets — switch between the default config, a cmake-format-style preset, a wide-line preset, and a custom-command preset to see how each knob shapes the output.
Shareable URLs — the URL updates as you edit, so you can link to a specific source/config state in bug reports or discussions.
Auto-refresh — output recomputes as you type; no manual “Format” click needed.

For documentation on what each option does, see the Config Reference and the Formatting Cookbook.

Docs track main. For historical docs, check out a release tag in the repository and build docs/ locally.