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Bootstrap is the most popular HTML, CSS, and JS framework in the world for building responsive, mobile-first projects on the web.

Download Bootstrap

Currently v4.0.0-alpha.5

Easy to get started.

Quickly include Bootstrap's CSS and JS into any project. Use your favorite package manager, download the source, or use the Bootstrap CDN.

Managed dependencies

Include Bootstrap's source Sass and JavaScript files via Bower, Composer, Meteor, or npm. Package managed installs don't include documentation, but do include our Gruntfile and readme.

View install methods

Bootstrap CDN

When you just need to include Bootstrap's compiled CSS and JS, use the Bootstrap CDN, free from the Max CDN folks.

<link rel="stylesheet" href="" integrity="sha384-AysaV+vQoT3kOAXZkl02PThvDr8HYKPZhNT5h/CXfBThSRXQ6jW5DO2ekP5ViFdi" crossorigin="anonymous">
<script src="" integrity="sha384-BLiI7JTZm+JWlgKa0M0kGRpJbF2J8q+qreVrKBC47e3K6BW78kGLrCkeRX6I9RoK" crossorigin="anonymous"></script>

Looking for something else? Compiled builds of Bootstrap's CSS and JS are also available.

More download options

Designed for everyone, everywhere.

Bootstrap makes front-end web development faster and easier. It's made for folks of all skill levels, devices of all shapes, and projects of all sizes.

Sass support


Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices

One framework, every device.

Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.


Full of features

With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.

Bootstrap is open source! It's hosted, developed, and maintained on GitHub by folks like you.

View the GitHub project

Official Bootstrap Themes.

Take Bootstrap to the next level with official premium themes. Each theme is its own toolkit featuring all of Bootstrap, brand new components and plugins, full docs, build tools, and more.

Browse themes

Bootstrap Themes

Built with Bootstrap.

Millions of amazing sites across the web are being built with Bootstrap. Get started on your own with our growing collection of examples or by exploring some of our favorites.

We showcase dozens of inspiring projects built with Bootstrap on the Bootstrap Expo.

Explore the Expo