Paste your desktop-first CSS and get clean, optimized mobile-first output instantly. No signup. No config. Just works.
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.container {
width: 1200px;
padding: 40px;
}
@media (max-width: 768px) {
.container {
width: 100%;
padding: 16px;
}
}
.container {
width: 100%;
padding: 16px;
}
@media (min-width: 769px) {
.container {
width: 1200px;
padding: 40px;
}
}
Features
Everything you need to modernize your CSS. Nothing you don't.
Paste your CSS and get mobile-first output in milliseconds. Zero latency, client-side processing.
Converts max-width queries to min-width. Your CSS follows modern responsive best practices.
Output is properly formatted with consistent indentation. Ready to copy-paste into production.
Everything runs in your browser. Your code never leaves your machine. Zero tracking.
Multiple breakpoints, and edge cases — all handled correctly.
No signup, no paywall, no limits. Use it as much as you want, whenever you want.