Bootstrap 4

Build responsive, mobile-first projects on the web with the world's most popular front-end component library. Bootstrap is an open source toolkit for developing with HTML, CSS, and JS. Quickly prototype your ideas or build your entire app with our Sass variables and mixins, responsive grid system, extensive prebuilt components, and powerful plugins built on jQuery.

Version Year
Ver 1 2011
Ver 2 2012
Ver 3 2013
Ver 4 2015
Version Year
Ver 1 2011
Ver 2 2012
Ver 3 2013
Ver 4 2015

Download Bootstrap 4

Compiled CSS and JS

Download ready-to-use compiled code for Bootstrap v4.1.3 to easily drop into your project, which includes:

  • Compiled and minified CSS bundles (see CSS files comparison)
  • Compiled and minified JavaScript plugins

This doesn’t include documentation, source files, or any optional JavaScript dependencies (jQuery and Popper.js).

Source files

Compile Bootstrap with your own asset pipeline by downloading our source Sass, JavaScript, and documentation files. This option requires some additional tooling:

  • Sass compiler (Libsass or Ruby Sass is supported) for compiling your CSS.
  • Autoprefixer for CSS vendor prefixing

Should you require build tools, they are included for developing Bootstrap and its docs, but they’re likely unsuitable for your own purposes.

Package managers

Pull in Bootstrap’s source files into nearly any project with some of the most popular package managers. No matter the package manager, Bootstrap will require a Sass compiler and Autoprefixer for a setup that matches our official compiled versions.

  • npm install bootstrap
  • Install-Package bootstrap

If you develop in .NET, you can also install and manage Bootstrap’s CSS or Sass and JavaScript using NuGet:

BootstrapCDN

Skip the download with BootstrapCDN to deliver cached version of Bootstrap’s compiled CSS and JS to your project.

CSS JS

Bootstrap image