Stylus to CSS Converter — Free Online Tool
Convert Stylus preprocessor code to standard CSS instantly, free, browser-only.
Input Stylus
Converted CSS
Stylus to CSS Examples
Stylus variables and nesting compile to plain CSS. Example:
Variables and nested selectors
Input Stylus:
Compiled CSS:
Use Sample above to load more example data.
What Is Stylus to CSS?
You've got a .styl file with variables, nested selectors, and that clean minimal syntax — but the browser only speaks plain CSS. That's the gap this tool closes. Stylus is a CSS preprocessor known for its flexible syntax: you can omit braces, semicolons, and colons entirely. Like Sass/SCSS and Less, it needs to be compiled before browsers can use it. In a full project you'd use the official Stylus npm package or a bundler plugin — but for quick checks, sharing snippets, or exploring what Stylus produces, that's overkill. This tool runs the conversion entirely in your browser using JavaScript — no server, no install. The output follows the W3C CSS specification, and you can validate it against MDN's CSS reference. For comparison, Vite and Webpack both support Stylus via plugins when you're ready for a full build pipeline.
Paste Stylus or upload a .styl file. The tool handles variables, nesting, and the & parent selector. It runs entirely in your browser. For SCSS or Less, use SCSS to CSS or Less to CSS. For formatting the output, use CSS Formatter.
How to Use This Tool
Paste or Upload Stylus
Paste your Stylus code into the left editor or click Upload to load a .styl file. Use Sample to load example Stylus with variables and nesting.
Review the CSS Output
The right panel shows the compiled CSS. For complex Stylus (mixins, functions, imports), the official Stylus compiler may be needed. For validation, use CSS Validator.
Copy or Download
Use Copy or Download to save the CSS. For minifying, use CSS Minifier. For converting CSS to SCSS or Less, use CSS to SCSS or CSS to Less.
Where Stylus Conversion Helps
Stylus is used in projects built with Vite, Webpack, or Gulp. When you need to compile a snippet without a full build, or inspect what Stylus produces, this tool helps. Build pipelines typically use the official Stylus package.
For other preprocessors, use SCSS to CSS or Less to CSS. For combining CSS files, use CSS Combiner. For extracting CSS from HTML, use CSS Extractor.
Frequently Asked Questions
How do I convert Stylus to CSS without installing anything?
Just paste your Stylus code into this tool and the CSS appears instantly. Everything runs in your browser using JavaScript — no npm, no Node.js, no build step. Your code never leaves your device.
Does this tool support Stylus variables and nesting?
Yes. Variables (e.g. $primary = #007bff), nested selectors, and the & parent selector are all supported. For advanced features like mixins, functions, and @import, use the official Stylus compiler.
What is the difference between Stylus, SCSS, and Less?
All three are CSS preprocessors that compile to plain CSS. Stylus has the most flexible syntax — braces, semicolons, and colons are all optional. SCSS is CSS-superset syntax. Less is JavaScript-powered and similar to SCSS in syntax.
Why don't built-in functions like darken() work?
Built-in Stylus functions like darken() and lighten() require the full Stylus runtime to evaluate. This browser tool handles static conversion only. For full function support, install Stylus via npm and compile locally.
Is my Stylus code sent to a server?
No. All conversion runs entirely in your browser using JavaScript. Your Stylus code never leaves your device — there's no backend, no logging, no storage.