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@csstools

CSS Tools

We help you write your best CSS

Hey there 👋!

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We're building CSS Tools to enable you to use the newest features of CSS without having to worry about the browsers you're supporting.

We're doing that with PostCSS which allows us to create plugins that you can use to transform your CSS code so it's compatible with all browsers ✨.

We've created PostCSS Preset Env which packs all of these plugins together and lets you just configure and forget.

You can find the CSS features on cssdb.org which we keep up to date with the state they're, the support they have and some examples and links to get you used to that feature 🤓.

We're available through these channels:

And if you're curious to know what we're working on or how could you contribute, the projects are always a good first stop!

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  1. postcss-plugins postcss-plugins Public

    PostCSS Tools and Plugins

    CSS 1k 83

  2. cssdb cssdb Public

    A database of staged CSS features

    JavaScript 541 29

Repositories

Showing 10 of 119 repositories
  • postcss-sass Public

    Use Sass as a PostCSS plugin

    csstools/postcss-sass’s past year of commit activity
    JavaScript 147 CC0-1.0 31 1 0 Updated Dec 6, 2025
  • stylelint-value-no-unknown-custom-properties Public

    A stylelint rule to catch usage of unknown custom properties

    csstools/stylelint-value-no-unknown-custom-properties’s past year of commit activity
    JavaScript 73 CC0-1.0 32 4 1 Updated Dec 6, 2025
  • stylelint-media-use-custom-media Public

    Enforce usage of custom media queries in CSS

    csstools/stylelint-media-use-custom-media’s past year of commit activity
    JavaScript 15 CC0-1.0 4 0 1 Updated Dec 6, 2025
  • stylelint-use-nesting Public

    Enforce nesting when it is possible in CSS

    csstools/stylelint-use-nesting’s past year of commit activity
    JavaScript 47 CC0-1.0 10 4 0 Updated Dec 6, 2025
  • csstools/postcss-plugins-directory’s past year of commit activity
    JavaScript 5 MIT 0 0 0 Updated Dec 6, 2025
  • postcss-plugins Public

    PostCSS Tools and Plugins

    csstools/postcss-plugins’s past year of commit activity
    CSS 1,017 MIT-0 83 9 (1 issue needs help) 0 Updated Dec 4, 2025
  • cssdb Public

    A database of staged CSS features

    csstools/cssdb’s past year of commit activity
    JavaScript 541 MIT-0 29 0 0 Updated Dec 4, 2025
  • tokenizer Public

    Tokenize CSS according to the CSS Syntax

    csstools/tokenizer’s past year of commit activity
    TypeScript 72 CC0-1.0 6 0 1 Updated Aug 6, 2025
  • .github Public
    csstools/.github’s past year of commit activity
    2 1 0 0 Updated Mar 13, 2025
  • postcss-resolve-nested-selector Public

    Resolve a nested selector in a PostCSS AST

    csstools/postcss-resolve-nested-selector’s past year of commit activity
    JavaScript 12 MIT 5 0 0 Updated Dec 28, 2024