Last updated November 19, 2013. Created by corey.aufang on October 9, 2012.
Edited by Noe_. Log in to edit this page.

Documentation for the LESS CSS Preprocessor module.

Built using the lessphp library by Leaf Corcoran.

This module will automatically process any LESS files that are added using drupal_add_css or added through your module/theme's .info file.

Add your files just like any other .css file, just with .less as the extension, and they will be automatically processed.


  • Libraries API.
  • lessphp library unpacked so that '' is located at 'sites/all/libraries/lessphp/'.

LESS Development:


File placement

If your source file was "sites/all/modules/test/test.css.less"
Then your compiled file will be "sites/[yoursite_or_default]/files/less/[random.string]/sites/all/modules/test/test.css"


The following two examples provide equivalent functionality.


= drupal_get_path('module', 'less_demo');
drupal_add_css($module_path . '/styles/less_demo.css.less');

.info file:

stylesheets[all][] = styles/less_demo.css.less


Should work with most themes and caching mechanisms.

CSS Aggregation

Fully compatible with "Optimize CSS files" setting on "Admin->Site configuration->Performance" (admin/settings/performance).

RTL Support

RTL support will work as long as your file names end with ".css.less".

Assuming your file is named "somename.css.less", Drupal automatically looks for a file name "somename-rtl.css.less"

Contributed Modules

Confirmed to work with:

Looking for support? Visit the forums, or join #drupal-support in IRC.