CSS Variable Generator

Generate CSS custom property declarations for your design system. Add, edit, and copy variables instantly. Free, private, and runs locally in your browser.

; const copy = () => { navigator.clipboard.writeText(cssBlock).then(() => toast.success("CSS copied")); }; return ( CSS Variable Generator

Build your CSS custom properties (variables) and copy the generated :root block.

{vars.map((v, i) => ( updateVar(i, "name", e.target.value)} className="mb-1" /> updateVar(i, "value", e.target.value)} /> removeVar(i)} className="text-red-500">Remove ))} Add Variable Generated CSS Copy CSS

Who Is This For?

  • Developers setting up design tokens
  • Design systems architects
  • Teams standardising CSS variables

Common Uses

  • Create theme colour palettes
  • Define spacing and radius scales
  • Share design tokens with developers

Frequently Asked Questions

What are CSS custom properties?

Variables declared with --name that can be reused throughout a stylesheet and changed dynamically.

Is this processed locally?

Yes. The CSS is generated entirely in your browser.

Can I use this for dark mode?

Yes — define a :root for light mode and a [data-theme="dark"] block with the same variable names.

About CSS Variable Generator

CSS custom properties (a.k.a. CSS variables) are now supported in every browser and have replaced Sass variables for most use cases. This generator builds a starter

block with semantically named tokens for colors, spacing, radii, and typography so you can stop hand-typing hex codes.

Why CSS Variables Beat Sass Variables

Naming Tokens Well

semantic names (

. Fallbacks are great during development but should not be your production safety net — if a token is missing, the design system is broken and the fallback hides the bug." }} />

More Frequently Asked Questions

Do CSS variables work in IE11?

No — IE11 lacks support. If you still need IE11, fall back to Sass variables or use a PostCSS plugin to inline values.

Can I update variables with JavaScript?

Yes —

updates the entire app instantly.

Are CSS variables slower than Sass?

Negligibly. Modern browsers cache resolved values; the difference is unmeasurable in real apps.

Can I use them in media queries?

Inside the declaration, yes. As media query thresholds (e.g.

), not yet.

Should I use --kebab-case?

Yes — that is the convention and matches the CSS property syntax.