Quick Summary
CSS Online Viewer is a client-side CSS utility that formats stylesheets, converts px font-sizes and margins to rem units (base 16px), minifies CSS code, and extracts color palettes locally.
CSS Online Viewer & px-to-rem Converter
Format CSS code, compress production stylesheets, convert px units to rem, and extract color palettes.
Automatic px-to-rem Conversion
Convert fixed pixel dimensions into flexible rem units for responsive typography and layout grids (Alt+4).
Color Palette Extractor
Scan CSS stylesheets and extract all hex, rgb, and hsl color definitions instantly.
CSS Beautifier & Minifier
Format nested CSS rules or minify stylesheets for production deployment (Alt+1 / Alt+2).
Frequently Asked Questions
Why convert px to rem in CSS?
rem units scale proportionally based on user font preferences, improving accessibility and mobile responsiveness across devices.
What is the default base pixel size for rem calculation?
The converter uses 16px as the standard browser baseline (1rem = 16px).