The World's Most Popular CSS Framework
Bootstrap is the most popular HTML, CSS, and JavaScript framework for developing responsive, mobile-first websites. Originally created by Twitter developers Mark Otto and Jacob Thornton, Bootstrap has evolved into the world's most popular front-end toolkit, used by millions of developers worldwide. Bootstrap provides a comprehensive collection of pre-styled components, a powerful grid system, and extensive JavaScript plugins that enable developers to quickly build professional-looking websites without starting from scratch. With Bootstrap 5, the framework is faster, lighter, and more modern than ever.
Bootstrap is an open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components. Originally called "Twitter Blueprint," it was developed by Mark Otto and Jacob Thornton at Twitter as a framework to encourage consistency across internal tools.
Released as an open-source project in 2011, Bootstrap quickly became one of the most starred projects on GitHub and remains the most popular CSS framework today. Bootstrap 5, the latest major version, dropped jQuery as a dependency, embraced CSS custom properties, and introduced new components and utilities while maintaining the ease of use and flexibility that made Bootstrap popular.
Powerful 12-column responsive grid layout system with flexbox support for creating flexible layouts. Built with mobile-first approach for all screen sizes.
Extensive library of 40+ components including buttons, forms, cards, modals, navbars, alerts, badges, progress bars, and more ready to use.
Interactive components like carousels, tooltips, popovers, collapse, dropdowns, modals, and scrollspy without jQuery dependency in Bootstrap 5.
Show/hide elements based on screen size with display utilities and responsive breakpoints (xs, sm, md, lg, xl, xxl).
Modify variables and components via Sass for brand-specific designs, color schemes, and custom builds with only the components you need.
Works consistently across all modern browsers including Chrome, Firefox, Safari, Edge with extensive testing and polyfills.
Official icon library with 1,800+ free, high-quality SVG icons designed specifically for Bootstrap but usable in any project.
Right-to-left language support built-in for Arabic, Hebrew, and other RTL languages with automatic text direction.
Get professional-looking sites up quickly without designing components from scratch. Start building in minutes with CDN or npm.
Consistent appearance across different browsers with extensive testing and browser support. No more compatibility headaches.
Designed for mobile devices from the ground up with responsive breakpoints and touch-friendly components built in.
Extensive community support with millions of developers, Stack Overflow answers, tutorials, themes, and templates available.
Comprehensive documentation with live examples, code snippets, usage guidelines, and accessibility best practices.
Thousands of free and premium themes available from Bootstrap marketplaces, designers, and community members.
Used by millions of websites worldwide, proven reliability and stability in production environments for over 10 years.
Built with accessibility in mind, following WCAG guidelines for inclusive web experiences with proper ARIA attributes.
Grid, Container, Rows, Columns, Breakpoints
Typography, Images, Tables, Figures, Code
Input, Select, Checkbox, Radio, Validation
Buttons, Cards, Alerts, Badges, Modals, Navbar
Colors, Display, Flex, Spacing, Text, Position
Carousel, Collapse, Dropdown, Modal, Tooltip
Build professional business websites with contact forms, service pages, portfolios, team sections, and client testimonials.
Create backend management interfaces with tables, forms, charts, data visualization, and responsive layouts for data management.
Develop online store layouts with product grids, shopping carts, checkout pages, product details, and payment forms.
Create conversion-optimized landing pages with hero sections, features, pricing tables, testimonials, and call-to-action buttons.
Build personal or company portfolios showcasing work, projects, case studies, skills, and achievements with image galleries.
Design blog layouts with sidebar, cards, pagination, responsive typography support, comments, and category filtering.
Build data visualization and monitoring dashboards with progress bars, charts, stats cards, and real-time data displays.
Rapidly prototype web application interfaces for user testing, stakeholder presentations, and proof of concepts quickly.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Bootstrap Example</title>
<!-- Bootstrap CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<!-- Navbar -->
<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
<div class="container">
<a class="navbar-brand" href="#">MyBrand</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav">
<span class="navbar-toggler-icon"></span>
</button>
</div>
</nav>
<!-- Main Content -->
<div class="container my-5">
<div class="row">
<div class="col-md-6">
<div class="card shadow-sm">
<img src="image.jpg" class="card-img-top" alt="...">
<div class="card-body">
<h5 class="card-title">Card Title</h5>
<p class="card-text">Some quick example text.</p>
<a href="#" class="btn btn-primary">Learn More</a>
</div>
</div>
</div>
</div>
</div>
<!-- Bootstrap JS Bundle -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
</body>
</html>Bootstrap has been used by millions of websites and applications worldwide. While many sites have moved to custom solutions, Bootstrap remains the foundation for countless projects and continues to be the go-to choice for rapid development.
GitHub Stars: 168,000+ stars, one of the most popular projects
Downloads: Over 5 million npm downloads per week
Websites: Used by millions of websites worldwide
Fastest way to get started - just add the CSS and JS links to your HTML.
<link href="bootstrap.min.css">For projects with build tools, install Bootstrap via npm package manager.
npm install bootstrapUse Bootstrap classes in your HTML and customize with Sass if needed.
<div class="container">Leverage the 12-column grid for responsive layouts
Modify Bootstrap variables for brand-specific designs
Design for mobile first, then add desktop styles
Leverage spacing, display, and text utilities
Extend Bootstrap rather than modifying core files
Test on multiple devices and breakpoints
Choose appropriate components for your use case
Only include the components you actually use