> A modular minifier, built on top of the [PostCSS] ecosystem. [][ci] [](https://ci.appveyor.com/project/ben-eb/cssnano/branch/master) [](https://coveralls.io/github/ben-eb/cssnano?branch=master) [][npm] [][deps] [](https://gitter.im/ben-eb/cssnano?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) cssnano is a modular minifier that aims to utilise small modules from the PostCSS ecosystem, rather than being an all-encompassing module that may be difficult to contribute to. Because it is written on top of PostCSS, it is able to do more than simple whitespace transforms - including advanced optimisations such as custom identifier reduction, `z-index` rebasing, and adjacent selector merging. Note that cssnano enables aggressive optimisations by default, which might not always be what you want. Set `options.safe` to `true` if you want to disable this. In future versions, only safe options will be enabled by default, starting from [version 4][v4]. For further details check out the [website](http://cssnano.co/): * [Installation guide for your build process](http://cssnano.co/usage/). * [Full list of optimisations](http://cssnano.co/optimisations/). * [Customise the output (options documentation)](http://cssnano.co/options/). You can now [try cssnano online](https://runkit.com/npm/cssnano) via Runkit! ## Contributing See [CONTRIBUTING.md](CONTRIBUTING.md). ## Links Please help to support this project by [purchasing a cssnano sticker][sticker]. [sticker]: https://www.stickermule.com/uk/marketplace/11086-cssnano ## License MIT © [Ben Briggs](http://beneb.info) [PostCSS]: https://github.com/postcss/postcss [ci]: https://travis-ci.org/ben-eb/cssnano [deps]: https://gemnasium.com/ben-eb/cssnano [npm]: http://badge.fury.io/js/cssnano [v4]: https://github.com/ben-eb/cssnano/issues/88