CSS to TailwindCSS Converter

The CSS to TailwindCSS Converter is a professional style migration tool that automatically converts traditional CSS code to Tailwind CSS utility classes, supporting nested syntax, media queries, pseudo-classes, and other complex scenarios. Suitable for frontend developers performing project migrations, learning Tailwind CSS syntax, or quickly refactoring style code.

Key Features

Smart Syntax Conversion

Automatically maps standard CSS properties to corresponding Tailwind CSS utility classes. The converter recognizes common CSS properties like padding, margin, color, font-size, etc., and generates Tailwind class names like p-4, ml-4, text-blue-500, text-sm, etc.

Nested Syntax Support

Supports SCSS/Sass-style nested syntax. Can handle:

• Nested selectors (&:hover, &.active)
• Nested media queries (@media)
• @supports feature queries
• Pseudo-elements and pseudo-classes

This enables accurate conversion of complex modern CSS code.

Tailwind Configuration Integration

Supports custom Tailwind configuration files; conversion references:

• Custom colors: Extended colors configuration recognized and used for conversion
• Custom breakpoints: Screens configuration used for media query conversion
• Custom spacing: Spacing configuration used for padding, margin, etc.
• @supports features: Supports configuration used for feature queries

This ensures conversion results align with project Tailwind configuration.

rem/px Unit Conversion

Provides rem to px conversion option (default 1rem = 16px), adjustable base value based on project needs. For projects using rem units, the converter automatically calculates to closest Tailwind spacing unit.

Real-Time Preview

Left editor inputs CSS code, right side displays converted Tailwind class names in real-time. Editor supports syntax highlighting and code formatting, convenient for comparison and verification of conversion effects.

Application Scenarios

Project Migration

When migrating existing projects from traditional CSS or Bootstrap to Tailwind CSS, use the tool to batch convert style code, significantly reducing manual rewriting workload. Suitable for medium to large-scale project style refactoring.

Learning Tailwind CSS

Beginners input familiar CSS code and observe conversion results to learn Tailwind CSS class name rules and naming conventions. This is an intuitive and efficient learning method that quickly establishes correspondence between CSS properties and Tailwind classes.

Rapid Prototype Development

Quickly convert CSS styles extracted from design files to Tailwind class names, accelerating prototype development process. Especially suitable for collaboration scenarios where designers provide CSS code.

Style Optimization

Convert redundant CSS code to streamlined Tailwind classes, leveraging TailwindCSS atomicity to reduce style duplication and optimize final bundle size.

Conversion Examples

Basic Styles

Input CSS:

.button {
  padding: 0.875rem 1rem;
  margin-left: 16px;
  text-align: center;
  font-size: 12px;
  color: #3b82f6;
}

Conversion result:

<div class="py-3.5 px-4 ml-4 text-center text-xs text-blue-500">

Responsive Design

Input CSS:

.container {
  width: 100%;

  @media (min-width: 768px) {
    width: 750px;
  }

  @media (min-width: 1024px) {
    width: 970px;
  }
}

Conversion result:

<div class="w-full md:w-[750px] lg:w-[970px]">

Pseudo-Class States

Input CSS:

.link {
  color: #3b82f6;

  &:hover {
    color: #1d4ed8;
    text-decoration: underline;
  }
}

Conversion result:

<a class="text-blue-500 hover:text-blue-700 hover:underline">

Configuration Instructions

Tailwind Config Example

The tool provides default example configuration, modifiable based on actual project needs:

{
  "content": [],
  "theme": {
    "extend": {
      "colors": {
        "custom-color": {
          "100": "#123456",
          "gold": "hsl(41, 28.3%, 79.8%)"
        }
      },
      "screens": {
        "custom-screen": { "min": "768px", "max": "1024px" }
      }
    },
    "supports": {
      "grid": "display: grid",
      "flex": "display: flex"
    }
  }
}

After configuration, the tool recognizes custom colors custom-color-100, custom-color-gold and custom breakpoint custom-screen:.

remInPx Option

Controls rem unit conversion baseline. Set to null to preserve rem units without conversion, set to number (e.g., 16) to convert rem to corresponding px value then map to Tailwind classes.

Important Notes

Conversion Limitations

Some complex CSS features may not perfectly convert to Tailwind classes:

• Complex CSS functions (like calc(), var()) may generate arbitrary value syntax [value]
• Keyframe animations (@keyframes) require manual configuration in Tailwind theme
• Browser-specific prefixes (-webkit-, -moz-) may require additional plugins

In these cases, combine with manual adjustments.

Class Name Redundancy

Conversion may produce multiple class name combinations; in actual use consider extracting as @apply directive or components to avoid overly lengthy HTML.

Semantic Loss

CSS class names typically have semantics (like .button-primary); after Tailwind conversion only style classes remain. Recommend preserving meaningful component class names as containers.

Production Optimization

Conversion results are best used during development; in production, configure your build to remove unused utility classes to keep bundles small.