bootstrap

What is bootstrap?

Bootstrap is a powerful front-end framework for faster and easier web development. It includes HTML, CSS, and JavaScript components for building responsive and mobile-first websites.

What are bootstrap's main functionalities?

Responsive Grid System

Bootstrap's grid system allows you to create responsive layouts that adapt to the screen size of devices.

<div class='container'>
  <div class='row'>
    <div class='col-md-4'>.col-md-4</div>
    <div class='col-md-4'>.col-md-4</div>
    <div class='col-md-4'>.col-md-4</div>
  </div>
</div>

Pre-styled Components

Bootstrap provides a wide range of pre-styled components such as buttons, forms, modals, etc., that can be easily customized and used in web projects.

<button type='button' class='btn btn-primary'>Primary Button</button>

JavaScript Plugins

Bootstrap comes with several jQuery plugins that add interactive features such as modals, dropdowns, and carousels.

<script>
  $(document).ready(function(){
    $('#myModal').modal('toggle');
  });
</script>

Utility Classes

Bootstrap includes utility classes for spacing, text alignment, display properties, and more, which help in fine-tuning the layout and design.

<div class='text-center mt-3 mb-4'>Centered text with margin top and bottom</div>

Other packages similar to bootstrap

foundation-sites

Foundation is a responsive front-end framework similar to Bootstrap but with a more semantic approach to the grid system and components.

bulma

Bulma is a modern CSS framework based on Flexbox. It is lightweight compared to Bootstrap as it doesn't include JavaScript components.

tailwindcss

Tailwind CSS is a utility-first CSS framework that provides low-level utility classes to build custom designs without writing CSS from scratch. It differs from Bootstrap's component-based approach.

semantic-ui

Semantic UI is a development framework that helps create beautiful, responsive layouts using human-friendly HTML. It offers a different philosophy with a focus on semantics and readability.

uikit

UIkit is a lightweight and modular front-end framework for developing fast and powerful web interfaces. It offers a comprehensive collection of HTML, CSS, and JS components which are simple to use, easy to customize, and extendable.

README

Bootstrap

Sleek, intuitive, and powerful front-end framework for faster and easier web development.
Explore Bootstrap docs »

Report bug · Request feature · Themes · Blog

Bootstrap 5

Our default branch is for development of our Bootstrap 5 release. Head to the v4-dev branch to view the readme, documentation, and source code for Bootstrap 4.

Table of contents

• Quick start
• Status
• What’s included
• Bugs and feature requests
• Documentation
• Contributing
• Community
• Versioning
• Creators
• Thanks
• Copyright and license

Quick start

Several quick start options are available:

• Download the latest release
• Clone the repo: git clone https://github.com/twbs/bootstrap.git
• Install with npm: npm install bootstrap@v5.3.6
• Install with yarn: yarn add bootstrap@v5.3.6
• Install with Bun: bun add bootstrap@v5.3.6
• Install with Composer: composer require twbs/bootstrap:5.3.6
• Install with NuGet: CSS: Install-Package bootstrap Sass: Install-Package bootstrap.sass

Read the Getting started page for information on the framework contents, templates, examples, and more.

Status

What’s included

Within the download you’ll find the following directories and files, logically grouping common assets and providing both compiled and minified variations.

Download contents

bootstrap/
├── css/
│   ├── bootstrap-grid.css
│   ├── bootstrap-grid.css.map
│   ├── bootstrap-grid.min.css
│   ├── bootstrap-grid.min.css.map
│   ├── bootstrap-grid.rtl.css
│   ├── bootstrap-grid.rtl.css.map
│   ├── bootstrap-grid.rtl.min.css
│   ├── bootstrap-grid.rtl.min.css.map
│   ├── bootstrap-reboot.css
│   ├── bootstrap-reboot.css.map
│   ├── bootstrap-reboot.min.css
│   ├── bootstrap-reboot.min.css.map
│   ├── bootstrap-reboot.rtl.css
│   ├── bootstrap-reboot.rtl.css.map
│   ├── bootstrap-reboot.rtl.min.css
│   ├── bootstrap-reboot.rtl.min.css.map
│   ├── bootstrap-utilities.css
│   ├── bootstrap-utilities.css.map
│   ├── bootstrap-utilities.min.css
│   ├── bootstrap-utilities.min.css.map
│   ├── bootstrap-utilities.rtl.css
│   ├── bootstrap-utilities.rtl.css.map
│   ├── bootstrap-utilities.rtl.min.css
│   ├── bootstrap-utilities.rtl.min.css.map
│   ├── bootstrap.css
│   ├── bootstrap.css.map
│   ├── bootstrap.min.css
│   ├── bootstrap.min.css.map
│   ├── bootstrap.rtl.css
│   ├── bootstrap.rtl.css.map
│   ├── bootstrap.rtl.min.css
│   └── bootstrap.rtl.min.css.map
└── js/
    ├── bootstrap.bundle.js
    ├── bootstrap.bundle.js.map
    ├── bootstrap.bundle.min.js
    ├── bootstrap.bundle.min.js.map
    ├── bootstrap.esm.js
    ├── bootstrap.esm.js.map
    ├── bootstrap.esm.min.js
    ├── bootstrap.esm.min.js.map
    ├── bootstrap.js
    ├── bootstrap.js.map
    ├── bootstrap.min.js
    └── bootstrap.min.js.map

We provide compiled CSS and JS (bootstrap.*), as well as compiled and minified CSS and JS (bootstrap.min.*). Source maps (bootstrap.*.map) are available for use with certain browsers’ developer tools. Bundled JS files (bootstrap.bundle.js and minified bootstrap.bundle.min.js) include Popper.

Bugs and feature requests

Have a bug or a feature request? Please first read the issue guidelines and search for existing and closed issues. If your problem or idea is not addressed yet, please open a new issue.

Documentation

Bootstrap’s documentation, included in this repo in the root directory, is built with Astro and publicly hosted on GitHub Pages at https://getbootstrap.com/. The docs may also be run locally.

Documentation search is powered by Algolia's DocSearch.

Running documentation locally

• Run npm install to install the Node.js dependencies, including Astro (the site builder).
• Run npm run test (or a specific npm script) to rebuild distributed CSS and JavaScript files, as well as our docs assets.
• From the root /bootstrap directory, run npm run docs-serve in the command line.
• Open http://localhost:9001/ in your browser, and voilà.

Learn more about using Astro by reading its documentation.

Documentation for previous releases

You can find all our previous releases docs on https://getbootstrap.com/docs/versions/.

Previous releases and their documentation are also available for download.

Contributing

Please read through our contributing guidelines. Included are directions for opening issues, coding standards, and notes on development.

Moreover, if your pull request contains JavaScript patches or features, you must include relevant unit tests. All HTML and CSS should conform to the Code Guide, maintained by Mark Otto.

Editor preferences are available in the editor config for easy use in common text editors. Read more and download plugins at https://editorconfig.org/.

Community

Get updates on Bootstrap’s development and chat with the project maintainers and community members.

• Follow @getbootstrap on X.
• Read and subscribe to The Official Bootstrap Blog.
• Ask questions and explore our GitHub Discussions.
• Discuss, ask questions, and more on the community Discord or Bootstrap subreddit.
• Chat with fellow Bootstrappers in IRC. On the irc.libera.chat server, in the #bootstrap channel.
• Implementation help may be found at Stack Overflow (tagged bootstrap-5).
• Developers should use the keyword bootstrap on packages which modify or add to the functionality of Bootstrap when distributing through npm or similar delivery mechanisms for maximum discoverability.

Versioning

For transparency into our release cycle and in striving to maintain backward compatibility, Bootstrap is maintained under the Semantic Versioning guidelines. Sometimes we screw up, but we adhere to those rules whenever possible.

See the Releases section of our GitHub project for changelogs for each release version of Bootstrap. Release announcement posts on the official Bootstrap blog contain summaries of the most noteworthy changes made in each release.

Creators

Mark Otto

• https://x.com/mdo
• https://github.com/mdo

Jacob Thornton

• https://x.com/fat
• https://github.com/fat

Thanks

Thanks to BrowserStack for providing the infrastructure that allows us to test in real browsers!

Thanks to Netlify for providing us with Deploy Previews!

Sponsors

Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [Become a sponsor]

Backers

Thank you to all our backers! 🙏 [Become a backer]

Copyright and license

Code and documentation copyright 2011-2025 the Bootstrap Authors. Code released under the MIT License. Docs released under Creative Commons.