Download Bootstrap – Most Popular Responsive CSS Framework for Web Development

Bootstrap is the world’s most popular open-source CSS framework for building responsive, mobile-first websites and web applications. Originally created by Twitter engineers, Bootstrap provides a comprehensive collection of pre-built UI components, a powerful grid system, and utility classes that let developers build professional-looking websites in a fraction of the time it would take from scratch.

With Bootstrap, you get ready-to-use components including navigation bars, buttons, forms, modals, carousels, cards, tooltips, and dozens more — all styled consistently and designed to work across every modern browser and screen size. The 12-column responsive grid system automatically adapts layouts to mobile, tablet, and desktop viewports with minimal custom CSS required.

Bootstrap 5 is the latest major version, which dropped the jQuery dependency in favor of vanilla JavaScript, added new utility classes, improved the grid system, and introduced RTL (right-to-left) language support. It is the go-to starting point for web developers worldwide.

Key Features

• Responsive 12-column grid system that adapts to mobile, tablet, and desktop screen sizes
• Dozens of pre-built UI components: navbars, buttons, cards, modals, forms, alerts, and more
• Extensive utility classes for spacing, typography, colors, flexbox, and display control
• JavaScript plugins for interactive components (dropdowns, modals, tooltips, carousels)
• Sass variables and mixins for easy customization of colors, fonts, and component styles
• Bootstrap 5 is jQuery-free — built on modern vanilla JavaScript
• RTL support and accessible components following WAI-ARIA standards

How to Install

1. Click the download button below to get the Bootstrap CSS and JS files as a compiled package.
2. Include the Bootstrap CSS in your HTML head: <link rel="stylesheet" href="bootstrap.min.css">
3. Add the Bootstrap JS bundle at the end of your body tag: <script src="bootstrap.bundle.min.js"></script>
4. Alternatively, install via npm: npm install bootstrap and import into your project.
5. Use Bootstrap classes in your HTML markup to apply the grid, components, and utilities instantly.