Code Quality Rank: L5
Monthly Downloads: 0
Programming language: TypeScript
License: MIT License
Tags: Parsing     Css     Source Map     Parser     Transform     Transpiler     Manipulation     Preprocessor     Rework     Postcss    
Latest version: v8.4.19

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PostCSS Gitter

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 PostCSS plugin is one of the most popular CSS processors.

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.

Support / Discussion: Gitter Twitter account: @postcss VK.com page: postcss šł≠śĖáÁŅĽŤĮĎ: [docs/README-cn.md](./docs/README-cn.md)

For PostCSS commercial support (consulting, improving the front-end culture of your company, PostCSS plugins), contact¬†Evil¬†Martians at [email protected].


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



Currently, PostCSS has more than 200 plugins. You¬†can find all of the plugins in the plugins list or in the searchable catalog. Below is a list of our favorite plugins ‚ÄĒ the best demonstrations of what can be built on top of PostCSS.

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

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

Better CSS Readability

Images and Fonts


  • 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.


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


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 <style> tags of HTML-like files.
  • postcss-markdown parsing styles in code blocks of Markdown files.
  • postcss-jsx parsing CSS in template / object literals of source files.
  • postcss-styled parsing CSS in template literals of source files.
  • postcss-scss allows you to work with SCSS (but does not compile SCSS to CSS).
  • postcss-sass allows you to work with Sass (but does not compile Sass to CSS).
  • postcss-less allows you to work with Less (but does not compile LESS to CSS).
  • postcss-less-engine allows you to work with Less (and DOES compile LESS to CSS using true Less.js evaluation).
  • postcss-js allows you to write styles in JS or transform React Inline Styles, Radium or JSS.
  • postcss-safe-parser finds and fixes CSS syntax errors.
  • midas converts a CSS string to highlighted HTML.


More articles and videos you can find on awesome-postcss list.



You can start using PostCSS in just two steps:

  1. Find and add PostCSS extensions for your build tool.
  2. Select plugins and add them to your PostCSS process.


The best way to use PostCSS with CSS-in-JS is astroturf. Add its loader to your webpack.config.js:

module.exports = {
  module: {
    rules: [
        test: /\.css$/,
        use: ['style-loader', 'postcss-loader'],
        test: /\.jsx?$/,
        use: ['babel-loader', 'astroturf/loader'],

Then create postcss.config.js:

module.exports = {
  plugins: [


Parcel has built-in PostCSS support. It already uses Autoprefixer and cssnano. If you want to change plugins, create postcss.config.js in project’s root:

module.exports = {
  plugins: [

Parcel will even automatically install these plugins for you.

Please, be aware of the several issues in Version 1. Notice, Version 2 may resolve the issues via issue #2157.


Use postcss-loader in webpack.config.js:

module.exports = {
  module: {
    rules: [
        test: /\.css$/,
        exclude: /node_modules/,
        use: [
            loader: 'style-loader',
            loader: 'css-loader',
            options: {
              importLoaders: 1,
            loader: 'postcss-loader'

Then create postcss.config.js:

module.exports = {
  plugins: [


Use gulp-postcss and gulp-sourcemaps.

gulp.task('css', () => {
  const postcss    = require('gulp-postcss')
  const sourcemaps = require('gulp-sourcemaps')

  return gulp.src('src/**/*.css')
    .pipe( sourcemaps.init() )
    .pipe( postcss([ require('autoprefixer'), require('postcss-nested') ]) )
    .pipe( sourcemaps.write('.') )
    .pipe( gulp.dest('build/') )

npm Scripts

To use PostCSS from your command-line interface or with npm scripts there is postcss-cli.

postcss --use autoprefixer -o main.css css/*.css


If you want to compile CSS string in browser (for instance, in live edit tools like CodePen), just use Browserify or webpack. They will pack PostCSS and plugins files into a single file.

To apply PostCSS plugins to React Inline Styles, JSS, Radium and other CSS-in-JS, you can use postcss-js and transforms style objects.

const postcss  = require('postcss-js')
const prefixer = postcss.sync([ require('autoprefixer') ])

prefixer({ display: 'flex' }) //=> { display: ['-webkit-box', '-webkit-flex', '-ms-flexbox', 'flex'] }



For other environments, you can use the JS API:

const autoprefixer = require('autoprefixer')
const postcss = require('postcss')
const postcssNested = require('postcss-nested')
const fs = require('fs')

fs.readFile('src/app.css', (err, css) => {
  postcss([autoprefixer, postcssNested])
    .process(css, { from: 'src/app.css', to: 'dest/app.css' })
    .then(result => {
      fs.writeFile('dest/app.css', result.css, () => true)
      if ( result.map ) {
        fs.writeFile('dest/app.css.map', result.map.toString(), () => true)

Read the PostCSS API documentation for more details about the JS API.

All PostCSS runners should pass PostCSS Runner Guidelines.


Most PostCSS runners accept two parameters:

  • An array of plugins.
  • An object of options.

Common options:

  • syntax: an object providing a syntax parser and a stringifier.
  • parser: a special syntax parser (for example, SCSS).
  • stringifier: a special syntax output generator (for example, Midas).
  • map: source map options.
  • from: the input file name (most runners set it automatically).
  • to: the output file name (most runners set it automatically).

Treat Warnings as Errors

In some situations it might be helpful to fail the build on any warning from PostCSS or one of its plugins. This guarantees that no warnings go unnoticed, and helps to avoid bugs. While there is no option to enable treating warnings as errors, it can easily be done by adding postcss-fail-on-warn plugin in the end of PostCSS plugins:

module.exports = {
  plugins: [

Editors & IDE Integration

VS Code


Sublime Text



To get support for PostCSS in WebStorm and other JetBrains IDEs you need to install this plugin.

Security Contact

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.

For Enterprise

Available as part of the Tidelift Subscription.

The maintainers of postcss and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. Learn more.