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twbs/bootstrap

Popular front-end framework of HTML, CSS and Sass/JavaScript components for building responsive, mobile-first websites.

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What is it?

Bootstrap is a front-end framework for building responsive, mobile-first web pages. It ships a grid system, a set of reusable UI components such as navbars, modals, forms and cards, and utility classes for spacing, colour and layout, all written in CSS with optional JavaScript behaviour.

The distribution includes compiled and minified CSS and JS files, along with a Sass source tree for customising the framework through variables. Bundled JS builds include Floating UI and Vanilla Calendar Pro. CSS files support both left-to-right and right-to-left layouts through logical properties, so switching a page to RTL only requires setting dir="rtl".

This repository is the development branch for Bootstrap 6, currently at alpha. Bootstrap 5 source and docs live on the v5-dev branch. The framework can be installed via npm, Yarn, Bun, Composer, NuGet or downloaded directly.

Key features

  • 01Responsive grid system and mobile-first breakpoints.
  • 02Prebuilt components including navbars, modals, forms and cards.
  • 03Utility classes for spacing, colour, and layout.
  • 04Sass source for customising theme variables.
  • 05CSS supports LTR and RTL layouts via logical properties.

Use cases

  • Building responsive marketing sites or landing pages quickly.
  • Creating admin dashboards and internal tools with standard UI components.
  • Adding a consistent design system to server-rendered or static HTML projects.

Quick start

  1. 1

    Install with npm

    npm install bootstrap@6.0.0-alpha.1
  2. 2

    Or install with yarn

    yarn add bootstrap@6.0.0-alpha.1
  3. 3

    Or clone the repository

    git clone https://github.com/twbs/bootstrap.git

Things to know

  • The default branch is Bootstrap 6, which is currently an alpha pre-release.
  • Bootstrap 5 documentation and source are on a separate v5-dev branch.

Topics

#css#front-end#html#javascript#sass#responsive-design#css-framework#bootstrap#scss

FAQ

What is bootstrap?
Popular front-end framework of HTML, CSS and Sass/JavaScript components for building responsive, mobile-first websites. Bootstrap is a front-end framework for building responsive, mobile-first web pages. It ships a grid system, a set of reusable UI components such as navbars, modals, forms and cards, and utility classes for spacing, colour and layout, all written in CSS with optional JavaScript behaviour.
Is bootstrap free to use? What license does it have?
bootstrap is open source under the MIT license. Check the license terms before using it in commercial products.
Is bootstrap still maintained?
Actively maintained. The last commit to bootstrap was on Oct 20, 2026.
What can I use bootstrap for?
Building responsive marketing sites or landing pages quickly. Creating admin dashboards and internal tools with standard UI components. Adding a consistent design system to server-rendered or static HTML projects.
How do I install bootstrap?
Install with npm: npm install bootstrap@6.0.0-alpha.1 Or install with yarn: yarn add bootstrap@6.0.0-alpha.1 Or clone the repository: git clone https://github.com/twbs/bootstrap.git
Where can I get bootstrap?
The source code and installation instructions are on GitHub: https://github.com/twbs/bootstrap

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