Quickly design and customize responsive mobile-first sites with Bootstrap, the world’s most popular front-end open source toolkit, featuring Sass variables and mixins, responsive grid system, extensive prebuilt ponents, and powerful JavaScript plugins.
Currently v4.5.0
Install Bootstrap’s source Sass and JavaScript files via npm, poser, or Meteor.
Package managed installs don’t include documentation or our full build scripts. You can also use our npm template repo to quickly generate a Bootstrap project via npm.
Read installation docs# Via npm
npm install bootstrap
# Via gem
gem install bootstrap -v 4.5.0When you only need to include Bootstrap’s piled CSS or JS, you can use BootstrapCDN.
See it in action with our simple starter template, or browse the examples to jumpstart your next project.
Explore the docs<!-- CSS only -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">
<!-- JS, Popper.js, and jQuery -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>For the first time ever, Bootstrap has its own open source SVG icon library, designed to work best with our ponents and documentation.
Bootstrap Icons are designed to work best with Bootstrap ponents, but they’ll work in any project. They’re SVGs, so they scale quickly and easily, can be implemented in several ways, and can be styled with CSS.
Get Bootstrap Icons
Take Bootstrap to the next level with premium themes from the official Bootstrap Themes marketplace.
Themes are built on Bootstrap as their own extended frameworks, rich with new ponents and plugins, documentation, and powerful build tools.
Browse themes