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CSS Variables Generator

Create CSS custom properties (variables) with a visual editor. Generate :root blocks with color pickers and presets.

1 variables

About this tool

CSS custom properties, or CSS variables, are reusable values that you can define once and use throughout your stylesheets. Instead of hardcoding colors, sizes, or other values directly into your CSS, you can store them as variables in a :root block and reference them with var(--name) syntax. This makes it easy to maintain consistent design tokens across your entire project and simplifies global theme changes—just update the variable value and the change applies everywhere it's used.

Using this CSS Variables Generator, you can visually create and organize your custom properties without writing code manually. Add variables one at a time, choose from preset theme templates for dark mode, light mode, or brand colors, then specify each variable's name, type (color, size, number, or string), and value. The tool automatically formats the output as a valid :root CSS block with inline comments showing how to use each variable in your styles. Once generated, copy the CSS directly to your clipboard or download it as a file.

This tool is especially useful for design system creation, maintaining multi-brand themes, or managing consistent spacing and typography scales. Whether you're building a small website or a large component library, having a centralized set of CSS variables reduces code duplication and makes design updates faster and more reliable.

Frequently Asked Questions

Code Implementation

# Generate CSS :root block from a dictionary of variables
def generate_css_variables(variables: dict) -> str:
    lines = [":root {"]
    for name, value in variables.items():
        var_name = name if name.startswith("--") else f"--{name}"
        lines.append(f"  {var_name}: {value};")
    lines.append("}")
    return "\n".join(lines)

# Example: dark mode theme
dark_theme = {
    "--bg-primary": "#0f0f0f",
    "--bg-secondary": "#1a1a1a",
    "--text-primary": "#ffffff",
    "--text-secondary": "#a0a0a0",
    "--accent": "#6366f1",
    "--border-radius": "8px",
    "--font-size-base": "16px",
}

print(generate_css_variables(dark_theme))

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