Build the web you want
The web framework for content-driven websites
Astro powers the world’s fastest marketing sites, blogs, e-commerce websites, and more.
Used by the largest companies around the world:
What is Astro?
Astro is a JavaScript web framework optimized for building fast, content-driven websites.
Server-First
Astro improves website performance by rendering components on the server, sending lightweight HTML to the browser with zero unnecessary JavaScript overhead.
Content-Driven
Astro was designed to work with your content, no matter where it lives. Load data from your file system, external API, or your favorite CMS.
Customizable
Extend Astro with your favorite tools. Bring your own JavaScript UI components, CSS libraries, themes, integrations, and more.
Best-In-Class Performance
Astro Islands
Islands optimize your website like no other web framework can. Leverage Astro’s unique page load performance to improve conversion rates, Core Web Vitals, and SEO.
% of real-world sites with good Core Web Vitals
View the full dataset · Based on real-world performance data from HTTP Archive and the Chrome UX Report.
Maximum Flexibility
Zero Lock-in
Astro supports every major UI framework. Bring your existing components and take advantage of Astro’s optimized client build performance.
Everything you need
Fully Featured
Astro comes with everything you need to build a modern website. Need more? Extend Astro with integrations.
Content Collections
Organize your Markdown and MDX with built-in TypeScript type-safety and frontmatter validation.
0
Zero JavaScript, By Default
Astro only ships the JavaScript you need and automatically strips away the rest for a faster website.
View Transitions
Seamlessly morph, fade, and swipe across pages with built-in, browser-native View Transition APIs.
800px · WEBP
3600px · PNG
Optimized Images
Eliminate layout shift and serve optimized, modern image formats with Astro’s built-in components and utilities.
UI Integrations
Bring your favorite UI frameworks and component libraries with Astro’s flexible island architecture.
File-Based Routing
Astro’s flexible routing system lets you understand your site’s structure at a glance.
Middleware
Wrap incoming requests with custom logic like authentication, logging, or data fetching.
Actions
Write type-safe backend functions that you can call directly from your frontend JavaScript client code.
Deployment Adapters
One-line configuration for Netlify, Vercel, AWS, or your favorite hosting platform.
Simple Templating
If you know HTML, you already know enough to write your first Astro component. Build powerful server components everyone on your team understands.
Instant Page Loads
Optimize page loading with intelligent automatic prefetching. Pick from the built-in presets or tailor a strategy perfect for your site.
AI-Ready
Integrate Astro’s official MCP server and context files with your favorite AI tools for a best-in-class development experience.
Environment Variables
Avoid common configuration mistakes with a built-in API to manage your environment variables.
Dev Toolbar
Extend your development environment with apps and integrations for the built-in development toolbar.
Ecosystem
Themes
Get started faster with a pre-built website theme for Astro. Customize it to make it your own.
Astro Partner Agencies
Get professional Astro support
Find the right team for your project with an Astro Partner Agency. From landing pages to e-commerce, get the expert assistance you need.
Start building with Astro today
Astro is free, open-source software made possible by these wonderful sponsors
Netlify
Webflow
Cloudflare
Mux
ImageKit
CloudCannon
Mintlify
ArcJet
Datadog
Databento
Fortuna
BairesDev
N-iX