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Minify CSS

grunt-contrib-cssmin v1.0.1

Minify CSS

If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:

npm install grunt-contrib-cssmin --save-dev

Once the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:


Issues with the output should be reported on the clean-css issue tracker.

Run this task with the grunt cssmin command.

Options are passed to clean-css. In addition this task defines some extra options:

Type: string
Choices: 'min', 'gzip'
Default: 'min'

Report minification result or both minification and gzip results. This is useful to see exactly how well clean-css is performing but using 'gzip' will make the task take 5-10x longer to complete. Example output.

Type: boolean
Choices: true, false
Default: false

Enable Source Maps.

cssmin: {
  options: {
    shorthandCompacting: false,
    roundingPrecision: -1
  target: {
    files: {
      'output.css': ['foo.css', 'bar.css']
cssmin: {
  target: {
    files: [{
      expand: true,
      cwd: 'release/css',
      src: ['*.css', '!*.min.css'],
      dest: 'release/css',
      ext: '.min.css'
  • 2016-03-16 v1.0.1 downgrade maxmin to support node 0.10
  • 2016-03-04 v1.0.0 Updated docs. Point main to task and removed peerDeps. Update clean-css to v3.4.1.
  • 2015-09-15 v0.14.0 bump to cssmin ~3.4.0 minor test fixes
  • 2015-07-27 v0.13.0 bump to cssmin ~3.3.0
  • 2015-05-09 v0.12.3 Improve reporting of errors and warnings. Log out written files and the saved size. Fix absolute paths.
  • 2015-02-20 v0.12.2 Set the rebase option to false by default.
  • 2015-02-09 v0.12.0 Add sourceMap option.
  • 2014-12-24 v0.11.0 Bump clean-css to 3.0.1. Remove banner option.
  • 2014-06-11 v0.10.0 update clean-css v2.2.0
  • 2014-02-01 v0.9.0 refactor. remove grunt-lib-contrib dependency. backwards-compatibly remove false choice from report.
  • 2014-02-14 v0.8.0 update clean-css v2.1.0
  • 2013-11-23 v0.7.0 update clean-css v2.0.0
  • 2013-09-14 v0.6.2 Support relative URLs via clean-css ~1.1.1.
  • 2013-05-25 v0.6.1 Support import in-lining vis clean-css ~1.0.4.
  • 2013-04-05 v0.6.0 Update clean-css dependency to ~1.0.0
  • 2013-03-14 v0.5.0 Support for 'report' option (false by default)
  • 2013-03-10 v0.4.2 Add banner option Support clean-css keepSpecialComments
  • 2013-02-17 v0.4.1 Update clean-css dependency to ~0.10.0
  • 2013-02-15 v0.4.0 First official release for Grunt 0.4.0.
  • 2013-01-23 v0.4.0rc7 Updating grunt/gruntplugin dependencies to rc7. Changing in-development grunt/gruntplugin dependency versions from tilde version ranges to specific versions.
  • 2013-01-09 v0.4.0rc5 Updating to work with grunt v0.4.0rc5. Switching to this.files api.
  • 2012-11-01 v0.3.2 Update clean-css dep.
  • 2012-10-12 v0.3.1 Rename grunt-contrib-lib dep to grunt-lib-contrib.
  • 2012-09-23 v0.3.0 Options no longer accepted from global config key.
  • 2012-09-10 v0.2.0 Refactored from grunt-contrib into individual repo.

Task submitted by Tim Branyen

This file was generated on Wed Mar 16 2016 10:47:01.