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LESS to CSS Compiler

Paste Less code and get plain CSS, compiled by the official Less.js engine in your browser — handy for maintaining Bootstrap 3 themes and older projects.

Actualizado el

Tus datos nunca salen de tu ordenador. Todo se procesa localmente en tu navegador.

Cómo usar: LESS to CSS Compiler

  1. Paste your Less code.
  2. The CSS compiles as you type; errors show the line and an explanation.
  3. Tick “Minify” for production and copy or download the CSS.

What the compiler handles

This is Less.js, the official Less compiler, running in your browser: @variables, nesting with &, mixins (with arguments and guards), operations like @base * 2, color functions such as darken() and fade(), @media bubbling, escaping and e().

Less vs Sass

Both add variables, nesting and mixins to CSS. Less is written in JavaScript and was used by Bootstrap 3 and many admin themes; Sass (SCSS) is now more common for new projects. Native CSS covers part of the gap today with custom properties and nesting, which modern browsers support.

Imports

Your own @import "variables.less" files can’t be read by the browser, so paste their content above the code that uses them.

Private by design

Compilation runs entirely in your browser — your code is never uploaded, so it’s safe for proprietary projects.

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Herramientas que combinan con: LESS to CSS Compiler

  • SCSS to CSS Compiler — Paste SCSS or indented Sass and get plain CSS, compiled by the official Dart Sass engine in your browser — with clear error messages pointing to the exact line.
  • CSS Formatter — Turn a minified stylesheet into readable CSS with one property per line and properly nested @media blocks.
  • CSS Minifier — Paste a stylesheet to shrink it instantly.
  • CSS to Tailwind Converter — Paste CSS rules or declarations and get the equivalent Tailwind utility classes for each selector — including hover: states and arbitrary values like p-[13px].

Preguntas frecuentes

Does it support Bootstrap 3 Less files?
Yes, the Less features Bootstrap uses compile here. Paste the variables and mixins your file imports above it, since other files can’t be loaded.
How do I minify the CSS?
Tick “Minify output”. Less removes whitespace and comments for the smallest CSS.
Is my code uploaded?
No. Less.js runs in your browser, so nothing leaves your device.
¿Puedo instalar LESS to CSS Compiler como aplicación web y utilizarla sin conexión?
Sí. LESS to CSS Compiler es una aplicación web instalable (PWA): se instala desde el navegador, no se descarga desde una tienda de aplicaciones. Haz clic en «Instalar aplicación» en la parte superior de esta página en Chrome o Edge (Windows, macOS, Linux, ChromeOS) o, en Android, utiliza «Compartir» → «Añadir a la pantalla de inicio» en iPhone y iPad, o «Archivo» → «Añadir al Dock» en Safari 17+ en un Mac. A continuación, se abrirá en su propia ventana con su propio icono y, como se ejecuta íntegramente en tu navegador, seguirá funcionando sin conexión. Firefox en el ordenador de sobremesa no permite instalar aplicaciones web. Cómo funciona la instalación.

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