How It Works
The converter parses your CSS, identifies media query patterns, inverts breakpoints, and outputs clean mobile-first code.
Drop your desktop-first CSS into the input panel. Works with any valid CSS that uses max-width media queries.
Supports multiple media queries, nested rules, complex selectors, and any CSS property.
Our parser identifies all max-width media queries, extracts breakpoints, and maps the CSS rule hierarchy.
The parser handles edge cases like multiple queries at the same breakpoint, mixed units (px, em, rem), and combined media conditions.
max-width breakpoints are converted to min-width equivalents. Mobile styles become the base, desktop styles get wrapped in queries.
max-width: 768px becomes min-width: 769px. Base rules swap positions with media query content to follow the mobile-first pattern.
The converted CSS is properly formatted and ready to use. Copy it, download it, or paste it directly into your project.
Output preserves your comments, maintains clean indentation, and orders media queries from smallest to largest breakpoint.
See the transformation in action
.card {
padding: 32px;
font-size: 18px;
}
@media (max-width: 768px) {
.card {
padding: 16px;
font-size: 14px;
}
}
.card {
padding: 16px;
font-size: 14px;
}
@media (min-width: 769px) {
.card {
padding: 32px;
font-size: 18px;
}
}
Mobile-first CSS means writing your base styles for mobile devices, then using min-width media queries to add styles for larger screens. This approach is recommended by CSS best practices and frameworks like Tailwind CSS.
Mobile-first CSS is more performant on mobile devices (which load only base styles), produces smaller payloads, and aligns with how modern frameworks expect you to write responsive code.
No. Everything runs 100% client-side in your browser using JavaScript. Your code never leaves your machine. There are no API calls, no tracking, and no data collection.
Currently, the converter works with plain CSS. Preprocessor syntax like SCSS nesting or LESS variables are not supported. Compile your SCSS/LESS to CSS first, then convert.
Yes. The tool is free for any use — personal, commercial, open source. No attribution required.