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by twbs

twbs /bootstrap

The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first project...

142.5K Stars 69.4K Forks Last release: 2 months ago (v4.5.0) MIT License 19.9K Commits 59 Releases

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

Report bug · Request feature · Themes · Blog

Bootstrap 4

Our default branch is for development of our upcoming Bootstrap 5 release. Head to the [


branch]( to view the readme, documentation, and source code for Bootstrap 4.

Table of contents

Quick start

Several quick start options are available:

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


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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. You'll see something like this:

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

We provide compiled CSS and JS (


), as well as compiled and minified CSS and JS (


). source maps (


) are available for use with certain browsers' developer tools. Bundled JS files (


and minified


) 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.


Bootstrap's documentation, included in this repo in the root directory, is built with Hugo and publicly hosted on GitHub Pages at The docs may also be run locally.

Documentation search is powered by Algolia's DocSearch. Working on our search? Be sure to set

debug: true




Running documentation locally

  1. Run
    npm install
    to install the Node.js dependencies, including Hugo (the site builder).
  2. Run
    npm run test
    (or a specific npm script) to rebuild distributed CSS and JavaScript files, as well as our docs assets.
  3. From the root
    directory, run
    npm run docs-serve
    in the command line.
  4. Open
    in your browser, and voilà.

Learn more about using Hugo by reading its documentation.

Documentation for previous releases

You can find all our previous releases docs on

Previous releases and their documentation are also available for download.


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


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


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.


Mark Otto

Jacob Thornton


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


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

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


Copyright and license

Code and documentation copyright 2011–2020 the Bootstrap Authors and Twitter, Inc. Code released under the MIT License. Docs released under Creative Commons.

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