CSS Variables Converter.

Modernize Your Stylesheets. Automatically extract design tokens from CSS and convert them to CSS custom properties. Generate organized variables for colors, spacing, typography, shadows, and more with intelligent naming and dark mode support.

CSS Variables Converter

Quick Examples

Click an example to load it into the converter

Use cases

Real-world uses.

Legacy CSS Modernization
Convert old CSS files with hardcoded values into modern CSS variables for better maintainability and theming capabilities.
Design System Creation
Extract design tokens from existing stylesheets to build a centralized design system with CSS custom properties.
Theme Development
Generate CSS variables from your styles to enable easy theme switching, dark mode, and multi-brand support.
Framework Migration
Convert framework-specific CSS (Bootstrap, Tailwind, etc.) to standard CSS variables for framework-agnostic theming.
Code Consistency
Identify and consolidate duplicate values across your CSS by converting them to reusable CSS variables.
Rapid Prototyping
Quickly extract tokens from design mockups or existing components to create a variable-based theme system.

How it works

Five steps.

  1. 01

    Upload a CSS file or paste your CSS code into the input area. The tool accepts standard CSS files (.css extension).

  2. 02

    Click 'Extract Variables' to automatically detect and extract all design tokens including colors, spacing, typography, shadows, and borders.

  3. 03

    Configure settings like variable prefix, naming convention, grouping options, dark mode generation, and output formatting preferences.

  4. 04

    Review and edit extracted variables in the Variables tab. Rename, modify values, or remove unwanted tokens to customize your theme.

  5. 05

    Copy or download the generated CSS variables. The output includes organized :root variables with optional dark mode variants and replaced CSS.

Features

Advanced CSS Variables Conversion Features.

Our CSS Variables Converter provides comprehensive tools to extract and convert CSS values into modern CSS custom properties.

  • Automatic CSS Extraction

    Upload or paste existing CSS files and automatically extract colors, spacing, typography, shadows, and other design tokens.

  • Intelligent Token Detection

    Smart extraction that detects patterns, groups similar values, and suggests semantic variable names automatically.

  • Smart Color Detection

    Supports hex, rgb, rgba, hsl, hsla, and named colors with automatic categorization and intelligent naming suggestions.

  • Typography Extraction

    Extract typography tokens including font sizes, weights, line heights, and font families with intelligent scale detection.

  • Spacing Scale Detection

    Automatic spacing extraction from margins, padding, gaps, and dimensions with smart scale grouping (xs, sm, md, lg, xl).

  • Flexible Configuration

    Customize variable prefixes, naming conventions (kebab-case, camelCase, snake_case), and output formatting options.

  • Organized Output

    Generate organized CSS variables grouped by category with optional dark mode variants and automatic value replacement.

  • Multiple Export Formats

    Export to CSS, SCSS, JSON, and TypeScript definitions for seamless integration with your development workflow.

  • Interactive Editor

    Rename, merge, remove, or modify extracted tokens before generating the final output. Add custom variables manually.

FAQ

Questions.

Can't find an answer? Send us your question.

What is CSS Variables Converter and why should I use it?

CSS Variables Converter automatically extracts design tokens from your existing CSS and converts them into CSS custom properties (variables). It's useful because: Modernizes legacy CSS by converting hardcoded values to reusable variables Creates a maintainable design system with centralized token management Enables easy theme switching and dark mode implementation Improves consistency across your stylesheet Saves time by automating the conversion process

What types of values can be extracted?

The tool automatically extracts: Colors: Hex, RGB, RGBA, HSL, HSLA, and named colors Spacing: Margins, padding, gaps, and dimension values Typography: Font sizes, weights, line heights, and font families Shadows: Box shadows and text shadows Borders: Border radius values

How does the automatic naming work?

The tool uses intelligent naming suggestions based on: Color values (e.g., #3b82f6 → primary, #64748b → secondary) Spacing scale detection (0.5rem → sm, 1rem → md, 2rem → lg) Typography scale patterns (0.875rem → sm, 1rem → base, 1.5rem → 2xl) Common design system conventions You can customize all variable names before generating the output.

Can I customize the variable naming convention?

Yes! The tool supports three naming conventions: kebab-case: --color-primary (default, most common) camelCase: --colorPrimary snake_case: --color_primary You can also set a custom prefix (default is "--") and manually edit any variable name.

Does it support dark mode generation?

Yes! When enabled, the tool generates a dark mode variant using @media (prefers-color-scheme: dark) . Color values are automatically adjusted for dark mode, though you can manually fine-tune them in the variables editor.

Can I replace values in my original CSS with variables?

Yes! Enable "Replace in Original CSS" to automatically replace all hardcoded values with their corresponding CSS variable references. This creates a fully variable-based stylesheet that's easier to maintain and theme.

What export formats are supported?

Currently, the tool exports as CSS with CSS custom properties. The output can be: Copied to clipboard for immediate use Downloaded as a .css file Exported as JSON for design tokens (via Copy JSON button) Future versions will support SCSS, LESS, and TypeScript definition exports.

Will this break my existing CSS?

No! The tool only extracts values and generates CSS variables. Your original CSS remains unchanged unless you enable "Replace in Original CSS". Even then, the replacement creates equivalent CSS using variables, so functionality is preserved. Always test the output in a development environment before deploying.

How accurate is the extraction?

The extraction is highly accurate for standard CSS syntax. It correctly identifies: All color formats (hex, rgb, rgba, hsl, hsla, named colors) Spacing values in various units (px, rem, em, %, vh, vw, etc.) Typography values from font-size, font-weight, and line-height properties Shadow values from box-shadow and text-shadow Complex values or non-standard syntax may require manual review and editing.

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