LESS to CSS Compiler — Compile LESS Online

Compile LESS stylesheets to plain CSS instantly. Handles variables, mixins, operations, and nested rules. Outputs clean, production-ready CSS without requiring a local compiler.

Key Features

Compiles LESS syntax including @variables, mixins, and nested rules
Supports arithmetic operations and built-in LESS color functions
Generates clean, cross-browser compliant CSS output
Immediate visual reporting for syntax errors and undefined variables

How to Use

Enter or paste your LESS code into the source editor.
Select whether you want readable expanded CSS or minified CSS.
Click "Compile LESS" to process the stylesheet.
Check the compiled CSS output in the results panel.
Copy the CSS to your clipboard or download it.

Example

Sample input

@gap: 12px;
.row {
  display: flex;
  gap: @gap;
  .cell { flex: 1; }
}

Sample output

.row {
  display: flex;
  gap: 12px;
}
.row .cell {
  flex: 1;
}

Edge Cases

Less functions like lighten()
Namespaced mixins
Inline JavaScript (deprecated)

Frequently Asked Questions

How does LESS syntax differ from SCSS?

LESS declares variables using the @ symbol (@color: #fff), whereas SCSS uses the dollar sign ($color: #fff). Both share similar nesting models.

Can I use parametric mixins with default arguments?

Yes. LESS parametric mixins with default and variable arguments compile accurately into standard CSS rules.

Is my LESS code sent to a server?

Yes. Compilation runs on our server over HTTPS. Your input is processed in memory and is not stored or logged.

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Privacy notice: when you run this tool, your input is sent over HTTPS to our server, processed in memory and returned. It is not stored or logged. Avoid pasting live secrets such as private keys or passwords.