PostCSS

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PostCSS is a tool for transforming CSS with JavaScript. It can be used to develop a template language such as Sass and LESS. The PostCSS core consists of:

CSS parser that generates an abstract syntax tree

Set of classes that comprises the tree

CSS generator that generates a CSS line for the object tree

Code map generator for the CSS changes made#

There are official tools making it possible to use PostCSS with build systems such as Webpack, Gulp, and Grunt. There is also a console interface available. Browserify or Webpack can be used to open PostCSS in a browser.

The complete plugin list can be found on postcss.parts, with some examples listed below.

Autoprefixer to add and clear browser prefixes.

CSS Modules to get CSS selectors isolated and code organized. It is supplied as part of Webpack.

stylelint to analyze CSS code for mistakes and check style consistency.

stylefmt fixes the CSS code according to the stylelint settings.

PreCSS to perform some Sass/Less preprocessing functions.

postcss-preset-env to emulate features from unfinished CSS specification drafts.

cssnano to make CSS smaller in size by getting rid of the spaces and rewriting the code.

RTLCSS to change CSS code so that the design should be suitable for right-to-left writing (such is applied in Arabic and Hebrew).

postcss-assets, postcss-inline-svg and postcss-sprites to work with graphics.

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tailwindcss

tailwindlabs / tailwindcss

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A utility-first CSS framework for rapid UI development.

css postcss responsive css-framework functional-css utility-classes tailwindcss

Updated Oct 24, 2025
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🌼 🌼 🌼 🌼 🌼 The most popular, free and open-source Tailwind CSS component library

css components ui-design design-systems front-end component postcss css-framework svelte ui-kit component-library css-components ui-pattern design-system ui-library ui-framework tailwind tailwindcss tailwind-css daisyui

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Transforming styles with JS plugins

css parser framework postcss ast

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😎 Awesome things related to Tailwind CSS

css awesome postcss apps resources websites awesome-list tailwind tailwindcss

Updated May 30, 2025

stylelint

stylelint / stylelint

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Star 11.4k

A mighty CSS linter that helps you avoid errors and enforce conventions.

css lint postcss linter enforce-conventions

Updated Oct 20, 2025
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uncss / uncss

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Remove unused styles from CSS

javascript css stylesheets postcss build-tool cleanup uncss unusedcss

Updated Jun 18, 2024
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FullHuman / purgecss

Star 8k

Remove unused CSS

css postcss webpack-plugin rollup-plugin postcss-plugin optimization-tools purgecss

Updated Oct 7, 2025
TypeScript

fkling / astexplorer

Star 6.5k

A web tool to explore the ASTs generated by various parsers.

javascript parser babel postcss ast jscodeshift ast-explorer

Updated Apr 26, 2024
JavaScript

panda

chakra-ui / panda

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Star 5.8k

🐼 Universal, Type-Safe, CSS-in-JS Framework for Design Systems ⚡️

css typescript postcss compiler engine css-in-js atomic-css utility-classes theming framework-agnostic jit-compiler design-tokens design-system styled-system

Updated Oct 25, 2025
TypeScript

MoOx / postcss-cssnext

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Star 5.3k

`postcss-cssnext` has been deprecated in favor of `postcss-preset-env`.

javascript css postcss cssnext postcss-plugins

Updated Jul 2, 2024
JavaScript

egoist / poi

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Star 5.2k

⚡A zero-config bundler for JavaScript applications.

react babel vuejs typescript webpack vue preact postcss bundle svelte build-tool

Updated Dec 6, 2021
JavaScript

cssnano / cssnano

Star 4.9k

A modular minifier, built on top of the PostCSS ecosystem.

css postcss minification cssnano optimisation

Updated Oct 23, 2025
CSS

lost

peterramsing / lost

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Star 4.5k

LostGrid is a powerful grid system built in PostCSS that works with any preprocessor and even vanilla CSS.

javascript css grid postcss

Updated Mar 3, 2024
JavaScript

suitcss / suit

Star 3.8k

Style tools for UI components

css postcss preprocessor suit-css css-packages

Updated May 29, 2022
HTML

rfs

twbs / rfs

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Star 3.4k

✩ Automates responsive resizing ✩

css sass postcss frontend responsive stylus scss font-size rfs

Updated Oct 1, 2025
CSS

evrone / postcss-px-to-viewport

Star 3.2k

A plugin for PostCSS that generates viewport units (vw, vh, vmin, vmax) from pixel units. The best choice to create a scalable interface on different displays by one design size.

postcss media-queries rem-units pixel-units vw vh taro css-scale mobile-design viewport-units