LESS to CSS Compiler
Paste LESS code and compile to standard CSS — supports variables, nesting, mixins, and operations
Paste your LESS code on the left, hit Compile, and get clean CSS on the right. Variables, nesting, mixins, math operations, color functions — it handles all of it in one click. And everything runs in your browser. Nothing gets uploaded.
How to Use
Paste your LESS code into the input panel on the left. You can use variables, nesting, the & parent selector, basic math, and color functions.
Choose output style — Expanded produces readable CSS with indentation, Compressed removes all whitespace for production.
Click Compile (or press Ctrl+Enter) to transform your LESS into standard CSS.
Copy or Download the compiled CSS as a .css file.
Frequently Asked Questions
What LESS features does this compiler support?
This compiler supports the most commonly used LESS features: variables (@variable), nested rules, the & parent selector, single-line and block comments, basic arithmetic operations (addition, subtraction, multiplication, division with units), and color functions (darken and lighten). It compiles everything client-side in your browser with no server required.
What is the difference between expanded and compressed output?
Expanded output formats the CSS with proper indentation, line breaks, and spacing for readability — ideal during development. Compressed output strips all unnecessary whitespace, newlines, and comments to produce the smallest possible file size, which is what you want for production deployment.
How does LESS nesting work?
LESS nesting lets you write selectors inside other selectors to mirror your HTML structure. For example, writing .nav { .item { color: red; } } compiles to .nav .item { color: red; }. The & operator references the parent selector, so .btn { &:hover { ... } } becomes .btn:hover { ... }, and .btn { &-primary { ... } } becomes .btn-primary { ... }.
Can I use LESS variables with math operations?
Yes. You can define variables like @size: 16px; and then use them in expressions like width: (@size * 2); which compiles to width: 32px;. The compiler handles addition, subtraction, multiplication, and division with px, em, rem, and % units, as well as unitless numbers.
Is my code secure?
Yes, 100%. All compilation happens entirely in your browser using JavaScript. Your LESS code is never uploaded to any server, never stored, and never leaves your device. You can verify this by disconnecting from the internet — the tool works fully offline.