PostCSS

PostCSS is a tool for transforming styles with JS plugins. These plugins can lint your CSS, support variables and mixins, transpile future CSS syntax, inline images, and more.

PostCSS is used by industry leaders including Wikipedia, Twitter, Alibaba, and JetBrains. The [Autoprefixer] and [Stylelint] PostCSS plugins are some of the most popular CSS tools.

PostCSS is built by Evil Martians, an American design and engineering consultancy for developer tools, AI, and cybersecurity startups.

[Abstract Syntax Tree]: https://en.wikipedia.org/wiki/Abstract_syntax_tree [Evil Martians]: https://evilmartians.com/?utm_source=postcss [Autoprefixer]: https://github.com/postcss/autoprefixer [Stylelint]: https://stylelint.io/ [plugins]: https://github.com/postcss/postcss#plugins

Sponsorship

PostCSS needs your support. We are accepting donations at Open Collective and GitHub Sponsors.

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Plugins

PostCSS takes a CSS file and provides an API to analyze and modify its rules (by transforming them into an [Abstract Syntax Tree]). This API can then be used by [plugins] to do a lot of useful things, e.g., to find errors automatically, or to insert vendor prefixes.

Currently, PostCSS has more than 200 plugins. You can find all of the plugins in the [plugins list]. Below is a list of our favorite plugins — the best demonstrations of what can be built on top of PostCSS.

If you have any new ideas, [PostCSS plugin development] is really easy.

[plugins list]: https://github.com/postcss/postcss/blob/main/docs/plugins.md

Solve Global CSS Problem

[postcss-use] allows you to explicitly set PostCSS plugins within CSS

and execute them only for the current file.

[postcss-modules] and [react-css-modules] automatically isolate

selectors within components.

[postcss-autoreset] is an alternative to using a global reset

that is better for isolatable components.

[postcss-initial] adds all: initial support, which resets

all inherited styles.

[cq-prolyfill] adds container query support, allowing styles that respond

to the width of the parent.

Use Future CSS, Today

[autoprefixer] adds vendor prefixes, using data from Can I Use.
[postcss-preset-env] allows you to use future CSS features today.

Better CSS Readability

[postcss-nested] unwraps nested rules the way Sass does.
[postcss-sorting] sorts the content of rules and at-rules.
[postcss-utilities] includes the most commonly used shortcuts and helpers.
[short] adds and extends numerous shorthand properties.

Images and Fonts

[postcss-url] postcss plugin to rebase url(), inline or copy asset.
[postcss-sprites] generates image sprites.
[font-magician] generates all the @font-face rules needed in CSS.
[postcss-inline-svg] allows you to inline SVG and customize its styles.
[postcss-write-svg] allows you to write simple SVG directly in your CSS.
[webp-in-css] to use WebP image format in CSS background.
[avif-in-css] to use AVIF image format in CSS background.

Linters

[stylelint] is a modular stylesheet linter.
[stylefmt] is a tool that automatically formats CSS

according stylelint rules.

[doiuse] lints CSS for browser support, using data from Can I Use.
[colorguard] helps you maintain a consistent color palette.

Other

[cssnano] is a modular CSS minifier.
[lost] is a feature-rich calc() grid system.
[rtlcss] mirrors styles for right-to-left locales.

[PostCSS plugin development]: https://github.com/postcss/postcss/blob/main/docs/writing-a-plugin.md [postcss-inline-svg]: https://github.com/TrySound/postcss-inline-svg [postcss-preset-env]: https://github.com/csstools/postcss-plugins/tree/main/plugin-packs/postcss-preset-env [react-css-modules]: https://github.com/gajus/react-css-modules [postcss-autoreset]: https://github.com/maximkoretskiy/postcss-autoreset [postcss-write-svg]: https://github.com/csstools/postcss-write-svg [postcss-utilities]: https://github.com/ismamz/postcss-utilities [postcss-initial]: https://github.com/maximkoretskiy/postcss-initial [postcss-sprites]: https://github.com/2createStudio/postcss-sprites [postcss-modules]: https://github.com/outpunk/postcss-modules [postcss-sorting]: https://github.com/hudochenkov/postcss-sorting [font-magician]: https://github.com/csstools/postcss-font-magician [autoprefixer]: https://github.com/postcss/autoprefixer [cq-prolyfill]: https://github.com/ausi/cq-prolyfill [postcss-url]: https://github.com/postcss/postcss-url [postcss-use]: https://github.com/postcss/postcss-use [css-modules]: https://github.com/css-modules/css-modules [webp-in-css]: https://github.com/ai/webp-in-css [avif-in-css]: https://github.com/nucliweb/avif-in-css [colorguard]: https://github.com/SlexAxton/css-colorguard [stylelint]: https://github.com/stylelint/stylelint [stylefmt]: https://github.com/morishitter/stylefmt [cssnano]: https://cssnano.github.io/cssnano/ [postcss-nested]: https://github.com/postcss/postcss-nested [doiuse]: https://github.com/anandthakker/doiuse [rtlcss]: https://github.com/MohammadYounes/rtlcss [short]: https://github.com/csstools/postcss-short [lost]: https://github.com/peterramsing/lost

Syntaxes

PostCSS can transform styles in any syntax, not just CSS. If there is not yet support for your favorite syntax, you can write a parser and/or stringifier to extend PostCSS.

[sugarss] is a indent-based syntax like Sass or Stylus.
[postcss-syntax] switch syntax automatically by file extensions.
[postcss-html] parsing styles in

postcss/postcss: Transforming styles with JS plugins