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.
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CSS Variables Converter
Quick Examples
Click an example to load it into the converter
Examples of Real-World Usage
6 real-world examples
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.
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.
How to Use
Simple 5-step process
Step 1
Upload a CSS file or paste your CSS code into the input area. The tool accepts standard CSS files (.css extension).
Step 2
Click 'Extract Variables' to automatically detect and extract all design tokens including colors, spacing, typography, shadows, and borders.
Step 3
Configure settings like variable prefix, naming convention, grouping options, dark mode generation, and output formatting preferences.
Step 4
Review and edit extracted variables in the Variables tab. Rename, modify values, or remove unwanted tokens to customize your theme.
Step 5
Copy or download the generated CSS variables. The output includes organized :root variables with optional dark mode variants and replaced CSS.
Frequently Asked Questions
Everything you need to know about our process, pricing, and technical capabilities.
See Full FAQCSS 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
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
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.
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.
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.
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.
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.
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.
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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