Minify modern CSS with Ruby. Csscompress currently uses CSSO via ExecJS.


Add this line to your application's Gemfile:

gem 'csscompress'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install csscompress


require "csscompress"
minified_css_string = Csscompress.minify("/path/to/css/file")

Rails with Sprockets / Asset Pipeline

In config/environments/production.rb and config/environments/test.rb:

config.assets.css_compressor = :csscompress


Bug reports and pull requests are welcome on GitHub at https://github.com/domchristie/csscompress. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.


The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Csscompress project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.