The most popular HTML, CSS, and JS framework in the world for building responsive, mobile-first projects on the web.
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.
Bootstrap ships with vanilla CSS, but its source code utilizes the two most popular CSS preprocessors, Less and Sass. Quickly get started with precompiled CSS.
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.
Fork the project on GitHub
Bootstrap is open source! It’s hosted, developed, and maintained on GitHub by folks like you.
View github project
Over a dozen reusable components built to provide iconography, dropdowns, input groups, navigation, alerts, and much more.
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.