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 components, and powerful JavaScript plugins.
Currently v4.6.0
Install Bootstrap’s source Sass and JavaScript files via npm, Composer, 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 docsnpm install bootstrapgem install bootstrap -v 4.6.0When you only need to include Bootstrap’s compiled CSS or JS, you can use jsDelivr.
See it in action with our simple starter template, or browse the examples to jumpstart your next project. You can also choose to include Popper and our JS separately.
Explore the docs<!-- CSS -->
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For the first time ever, Bootstrap has its own open source SVG icon library, designed to work best with our components and documentation.
Bootstrap Icons are designed to work best with Bootstrap components, 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 components and plugins, documentation, and powerful build tools.
Browse themes