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CSS Custom Properties Collector - Online List All :root Vars

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CSS Custom Properties Collector

Instantly extract, list, and export all :root CSS custom properties from any stylesheet

Frequently Asked Questions

CSS Custom Properties, often called CSS variables, are entities defined by CSS authors using a -- prefix (e.g., --main-color: #333). When declared inside the :root pseudo-class, they become globally available throughout the entire stylesheet. They allow for dynamic, reusable values that can be updated in real-time via JavaScript, making them essential for modern web design, theming, and responsive layouts.
The :root pseudo-class targets the highest-level element in the DOM (the <html> element). Defining your custom properties there ensures maximum inheritance scope — every descendant element can access them. This is the standard convention for design tokens, theme colors, font stacks, and spacing scales. It also keeps your variable definitions centralized and easy to maintain.
Yes! This tool parses CSS and extracts all custom properties defined within :root blocks. You can either paste raw CSS directly into the text area or fetch CSS from a publicly accessible URL. Note that for URL fetching, CORS (Cross-Origin Resource Sharing) policies may block some requests. If that happens, simply copy the CSS source manually and paste it into the tool.
Unlike preprocessor variables (SCSS $var or LESS @var), CSS custom properties are live in the browser. They can be accessed and modified at runtime using JavaScript (element.style.setProperty()), respond to media queries, and cascade through the DOM. Preprocessor variables are compiled away and become static values. CSS variables bring dynamic capability directly into the browser's rendering engine.
When multiple :root blocks define the same variable (e.g., in different @media queries or theme variants like :root[data-theme="dark"]), CSS cascade rules apply — the last declaration wins. This tool collects all unique variable names and displays the final resolved value from the last parsed :root block. If you need to analyze all theme variants, consider parsing each block separately.
Once extracted, you can copy all variables as clean CSS (ready to paste into your :root block), download them as a .css file, or export them as JSON for programmatic use. The JSON format is especially useful for design system tooling, documentation generators, or integrating with JavaScript frameworks that consume design tokens.
The tool automatically detects and previews colors in hex (#fff, #1a2b3c), RGB/RGBA, HSL/HSLA, HWB, LAB, LCH, OKLAB, OKLCH, and color-mix() formats. It also recognizes over 140 named CSS colors (like tomato, teal, gold). A small color swatch appears next to each detected color value, giving you instant visual feedback.
Absolutely! This CSS Custom Properties Collector is completely free for personal and commercial use. No registration, no ads, no data collection. Your CSS never leaves your browser — all parsing is done client-side. Use it to audit third-party stylesheets, reverse-engineer design systems, or simply organize your own CSS variable collections.
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