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CSS to Stylus Converter

Paste CSS and generate clean Stylus with indentation-based rules, optional nesting, optional variables, and a downloadable .styl file.

FreeNo SignupBrowser BasedCopy Stylus

Last updated: May 20, 2026

CSS to Stylus conversion runs locally in your browser. Your pasted CSS and generated Stylus are not uploaded.

Client-Side Processing
Input Data Stays on Device
Instant Local Execution
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Runs in your browserIndent-based outputNo upload required

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What is CSS to Stylus Converter?

A CSS to Stylus Converter turns standard CSS into Stylus source code. Stylus is a CSS preprocessor that supports concise indentation-based syntax, optional colons, variables, nesting, and other conveniences. Plain CSS can often be rewritten into Stylus by removing braces and semicolons, applying consistent indentation, and converting repeated values into variables where appropriate.

This tool keeps the conversion conservative. It parses CSS rules and at-rules, formats them as readable Stylus, optionally nests selectors with a clear shared parent, and can convert :root custom properties such as --brand-color into Stylus variables such as brand-color = #2563eb. The result is intended as a practical migration starter for existing CSS files, component styles, and examples copied from prototypes or browser developer tools.

How to Use CSS to Stylus Converter

1

Paste CSS into the input editor.

2

Keep "Nest matching selectors" enabled when you want rules like .card h2 and .card:hover grouped under .card.

3

Keep "Convert :root variables" enabled to turn CSS custom properties into Stylus variables.

4

Toggle "Keep property colons" if your project prefers color: #111827 over the shorter color #111827 form.

5

Choose the indentation style used by your codebase.

6

Review warnings, then copy the Stylus output or download it as a .styl file.

Common Use Cases

  • Migrating a legacy CSS file into a Stylus-based frontend project
  • Converting component CSS into indentation-based Stylus for cleaner source files
  • Turning :root custom properties into Stylus variables for build-time styles
  • Cleaning CSS copied from a browser inspector before moving it into a .styl file
  • Preparing Stylus examples for documentation, templates, or internal UI kits
  • Grouping hover, focus, and child selectors under a shared parent selector
  • Comparing CSS, LESS, SCSS, and Stylus versions during a stylesheet migration
  • Generating a quick .styl file without installing a local converter

Example Input and Output

Converting a card component from CSS into nested Stylus with variables:

CSS input
:root {
  --brand-color: #2563eb;
}

.card {
  color: #0f172a;
}

.card h2 {
  color: var(--brand-color);
}

.card:hover {
  border-color: var(--brand-color);
}
Stylus output
brand-color = #2563eb

.card
  color #0f172a

  h2
    color brand-color

  &:hover
    border-color brand-color

How This Tool Works

The converter strips comments, parses CSS rule blocks and at-rules, tracks declarations, and renders Stylus with indentation instead of braces. When enabled, it extracts custom properties from :root into Stylus variable assignments, rewrites known var() references, and groups selectors that share a class or ID base into nested Stylus blocks.

Technical Stack

CSS rule parsingStylus indentation syntaxStylus variable assignmentCSS custom property conversionClient-side TypeScriptBrowser Blob download

Indentation Matters

Stylus uses indentation to define nesting. Keep a consistent indent size and review generated nesting before committing the converted file.

Runtime CSS Variables

Stylus variables are resolved during preprocessing. Do not convert CSS custom properties that your app changes at runtime for theming or user settings.

Conservative Nesting

The converter only nests single selectors with a clear class or ID prefix. Comma-separated selector lists remain flat to avoid changing cascade behavior.

Frequently Asked Questions

What does this CSS to Stylus converter change?

It removes CSS braces and semicolons, formats declarations as indentation-based Stylus, optionally removes property colons, optionally nests matching selectors, and can convert :root CSS custom properties into Stylus variables.

Can Stylus use normal CSS syntax?

Stylus is flexible and can accept syntax closer to CSS, but many projects prefer the concise indentation-based form. This tool defaults to shorter Stylus output and includes an option to keep property colons when desired.

How are CSS variables converted?

When variable conversion is enabled, declarations in :root such as --brand-color: #2563eb become brand-color = #2563eb. Known var(--brand-color) references are rewritten to brand-color.

What happens to var() fallbacks?

Stylus variables do not support CSS var() fallback syntax. If a known CSS variable includes a fallback, the converter rewrites the main variable reference and shows a warning that the fallback was removed.

Will this compile Stylus back to CSS?

No. This tool converts CSS source into Stylus source. Use a Stylus compiler when you need browser-ready CSS output from a .styl file.

Is my CSS uploaded?

No. Parsing, conversion, copy, and download actions run in your browser. Your CSS and generated Stylus are not sent to a server.

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