Some of the fastest sites on the web don't run a single line of server-side code when a visitor loads a page. Every response is a pre-built file [served straight from a CDN](https://vercel.com/i/what-is-a-cdn), with nothing to compute and nothing to query. A static site generator (SSG) makes this possible by compiling content and templates into finished HTML, CSS, and JavaScript files at build time, so pages are ready before anyone arrives. This guide covers what static site generators are, how the build process works, and how the leading tools compare across speed, rendering flexibility, and community support. ## [Copy link to heading](#what-is-a-static-site-generator-\(ssg\))What is a static site generator (SSG)? A static site generator (SSG) takes content (Markdown files, data from APIs, or entries from a [headless CMS](https://vercel.com/i/headless-cms)) and merges it with templates to produce a complete set of HTML files before deployment. The output is a directory of finished pages that can be served from any CDN or static hosting provider with no server-side logic running at request time. ### [Copy link to heading](#static-sites-vs.-dynamic-sites)Static sites vs. dynamic sites The difference between static and dynamic sites comes down to when HTML gets generated. A static site produces all its pages during a build step, while a dynamic site generates HTML on the server for each request by querying databases and running application logic. Dynamic sites can serve personalized, real-time content, but that capability comes with maintaining application servers, databases, and caching layers that all add operational overhead. Static sites trade real-time freshness for simplicity. There's no database and no server-side code running when a visitor loads a page, which means fewer moving parts between a request and a response. ### [Copy link to heading](#ssg,-ssr,-and-isr-compared)SSG, SSR, and ISR compared Static site generation (SSG) prerenders pages at build time, producing HTML files cached and served from CDN nodes closest to visitors. [Server-side rendering](https://developer.mozilla.org/en-US/docs/Glossary/SSR) (SSR) generates HTML on every request, pulling in live data at the cost of more server-side work per page load. [Incremental static regeneration](https://vercel.com/docs/incremental-static-regeneration) (ISR) prerenders pages at build time like SSG, but regenerates individual ones in the background after deployment on a stale-while-revalidate pattern. ISR regenerates only the pages that need updating, on a configurable interval or through on-demand API calls. [Next.js](https://vercel.com/docs/frameworks/full-stack/nextjs) and other ISR-capable frameworks let teams adopt this per route, keeping pure static generation where content rarely changes. ## [Copy link to heading](#how-a-static-site-generator-works)How a static site generator works While each generator has its own tooling and configuration, the build process follows a consistent pattern across all of them: - **Content authoring:** Writers create pages in Markdown, MDX, or pull content from a headless CMS or API. Content stays separate from the presentation layer, so writers and developers can work independently. - **Template processing:** The generator merges content with layout templates, components, and partials to produce complete HTML pages. Each generator uses its own templating system, from Go templates in Hugo to JSX in Next.js. - **Build compilation:** A single build command processes every page and outputs a directory of static HTML, CSS, and JavaScript files. Images, fonts, and other assets are optimized during this step as well. - **CDN deployment:** The build output deploys to a CDN, where files are cached at edge locations around the world and served directly to visitors with no server-side processing per request. The end result is a site where the heaviest work happens once at build time rather than on every page load. ## [Copy link to heading](#benefits-of-using-a-static-site-generator)Benefits of using a static site generator ### [Copy link to heading](#faster-performance-and-page-speed)Faster performance and page speed Pre-built HTML files can be served directly from a CDN without reaching an application server, which cuts the work between a visitor's request and the response. The rendered HTML also contains resource references up front, so the browser's preload scanner discovers images and fonts before any JavaScript runs. That benefits Largest Contentful Paint (LCP), because the browser can start rendering immediately instead of waiting for scripts to tell it what to load. ### [Copy link to heading](#reduced-attack-surface)Reduced attack surface A static site served from a CDN exposes no database, no admin interface, and no server-side application logic at request time. On a dynamic CMS stack, each of those components is a separate vector that needs patching and monitoring. Static architectures don't eliminate the need for security practices, but they remove whole categories of vulnerabilities by design rather than configuration. ### [Copy link to heading](#simpler-scalability-and-hosting)Simpler scalability and hosting Dynamic sites scale by adding application servers, load balancers, and database connection pools, and each of those layers adds operational complexity. Static sites scale through CDN cache replication with no session state to synchronize and minimal work at the origin. A site that handles a hundred visitors a day and one that handles a hundred thousand can run on the same infrastructure, because CDNs are built to distribute cached files at volume without any extra provisioning. ### [Copy link to heading](#stronger-seo-and-core-web-vitals)Stronger SEO and Core Web Vitals [Google Search Central](https://developers.google.com/search/docs/appearance/core-web-vitals) includes Core Web Vitals in its page experience signals for Search, and static sites tend to perform well across all three metrics: - **Largest Contentful Paint (LCP):** Pre-rendered HTML reduces request-time work, so the browser starts rendering content faster than it would with a server-assembled page. - **Interaction to Next Paint (INP):** Static pages that don't require hydration avoid the client-side JavaScript overhead that hydration introduces, so interactions feel more responsive. - **Cumulative Layout Shift (CLS):** The initial HTML payload establishes content positions up front rather than shifting them with late-loading scripts. That gives visitors a more stable layout from the first render. [On pages where the LCP element was an image, 35% of those images](https://web.dev/articles/top-cwv) had source URLs that weren't discoverable in the initial HTML. Static generation fixes this by including those references from the first byte. ## [Copy link to heading](#when-to-use-a-static-site-generator-\(and-when-not-to\))When to use a static site generator (and when not to) Static site generators work well when content changes on a scale of hours or days rather than seconds, all URLs are predictable at build time, and every visitor sees the same page. The types of projects that fit this model include: - **Documentation sites:** Technical docs change infrequently and benefit from fast, globally cached delivery. - **Marketing pages:** Landing pages update on a campaign cycle, making build-time generation a good match. - **Blogs and publications:** Content published on an editorial cadence works cleanly with the build-deploy cycle. - **Developer portfolios:** Personal sites rarely change and have no dynamic data requirements. Static generation isn't the right fit when an application needs per-user personalization, real-time data, or content that changes faster than a build pipeline can keep up with. Modern frameworks don't force a binary choice, though. ISR handles periodic updates, and hybrid rendering lets teams use SSG for stable content while rendering dynamic sections per request. ## [Copy link to heading](#6-static-site-generators-compared)6 static site generators compared These six generators represent the range of options available today, from pure static tools to hybrid frameworks that can grow with a project. The right choice depends on your team's language background, content volume, and whether you'll need rendering capabilities beyond static output. ### [Copy link to heading](#next.js)Next.js Next.js is a React-based framework that supports SSG, SSR, ISR, and Cache Components (which build on the [Partial Prerendering model](https://nextjs.org/docs/app/glossary#partial-prerendering-ppr) to serve a static shell instantly while streaming dynamic content in the same response). That breadth makes it one of the few generators where teams can start with static pages and add dynamic rendering per route as needs change. **Key features:** - Per-route rendering mode selection (static, server-rendered, ISR, or Cache Components) - App Router with React Server Components and nested layouts - Built-in image optimization, font loading, and script management **Pros:** - Grows from a fully static site to a dynamic application without migrating to a different framework - Integrates deeply with Vercel for optimized builds, preview deployments, and ISR - Has the largest developer community in this comparison, with the most tutorials, templates, and third-party packages **Cons:** - Build configuration needs more attention at scale than static-only tools - The range of rendering options adds a learning curve if you only need static generation **Best for:** Projects that need hybrid rendering across routes, or that are likely to grow beyond static over time. ### [Copy link to heading](#astro)Astro [Astro](https://vercel.com/i/what-is-astro) ships zero JavaScript to the browser by default and uses an island architecture that hydrates only the interactive components you opt into. If your frontend team works with React, Vue, and Svelte, Astro lets you use all three in the same project without committing to one. **Key features:** - Zero client-side JavaScript by default, with opt-in hydration per component - Multi-framework component support, including React, Vue, Svelte, Preact, Solid, Lit, and Alpine.js in one project - Content Layer API for type-safe Markdown and MDX with Zod schema validation **Pros:** - Produces the smallest client-side bundles among full-featured SSGs because JavaScript only ships when explicitly requested - Lets teams bring existing component libraries from any supported framework without rewriting them - Catches content errors at build time through the Content Layer rather than surfacing them in production **Cons:** - SSR support is newer and less battle-tested than Next.js or SvelteKit - The plugin and integration ecosystem is still growing **Best for:** Content-heavy sites where teams want component flexibility with minimal client-side overhead. ### [Copy link to heading](#hugo)Hugo Hugo is a single Go binary that handles RSS, sitemaps, image processing, taxonomies, and multilingual content without any plugins or package managers. Build speed is its defining trait, and it renders large sites in seconds in most configurations. **Key features:** - Single binary installation with no npm, Node.js, or external dependency chain - Fast build times, often sub-second for smaller or simpler sites - Built-in RSS, sitemaps, image processing, taxonomies, and multilingual support **Pros:** - Fastest build times of any generator in this comparison by a wide margin - No dependency management overhead, which simplifies [CI/CD pipelines](https://vercel.com/i/ci-cd-pipeline) - The built-in feature set covers most content site needs without third-party plugins **Cons:** - Pure static output only, with no SSR or ISR capability - Go template syntax has a learning curve for developers coming from JavaScript-based tooling **Best for:** Documentation and high-volume content sites where fast builds and minimal tooling overhead are priorities. ### [Copy link to heading](#eleventy)Eleventy Eleventy supports multiple template languages (including Nunjucks, Liquid, Handlebars, JavaScript, WebC, and Markdown) and keeps a small install footprint for a Node.js-based SSG. It stays close to the metal, giving teams direct control over output without layering on framework abstractions. **Key features:** - Multiple template language support with no client-side framework requirement - Full npm access for pulling in plugins, data sources, and build tools - Minimal abstraction layer between source content and generated output **Pros:** - Full control over HTML output without framework opinions imposed on structure or rendering - Template language flexibility lets teams pick what they already know instead of learning a new syntax - Lightweight dependency tree with fast install times across environments **Cons:** - No built-in server-side rendering or ISR support - Smaller community with fewer ready-made themes and starter projects compared to Next.js or Hugo **Best for:** Projects that prioritize framework independence and direct control over output, without needing hybrid rendering. ### [Copy link to heading](#sveltekit)SvelteKit [SvelteKit](https://vercel.com/docs/frameworks/full-stack/sveltekit) can function as a static site generator by prerendering routes, and it supports per-page SSR, API routes, and ISR when deployed to Vercel with the Vercel adapter. Svelte's compiler-based approach means the framework compiles components into vanilla JavaScript at build time, producing smaller bundles than virtual-DOM frameworks. **Key features:** - Per-route rendering mode selection (static prerendering, SSR, or ISR) - File-system routing with built-in form handling, data loading, and error boundaries - Compiler produces framework-free JavaScript bundles with minimal runtime overhead **Pros:** - Smaller runtime bundles than React or Vue because the compiler generates vanilla JavaScript with no virtual DOM - Clean upgrade path from static prerendering to SSR and ISR as project requirements grow - Built-in form handling and data loading reduce the need for third-party routing and data libraries **Cons:** - Fewer third-party components and integrations than the React community offers - Svelte expertise is less common than React or Vue, which can narrow hiring options **Best for:** Svelte teams expecting to grow beyond static, or projects wanting a lighter alternative to Next.js. ### [Copy link to heading](#jekyll)Jekyll Jekyll is the oldest widely-used SSG in this comparison and remains a practical choice for Ruby-based static publishing. Its native GitHub Pages integration means teams can push to a repository and have a live site without configuring any hosting or CI/CD pipeline. **Key features:** - Native GitHub Pages integration for zero-config hosting and deployment - Large library of community themes and plugins built over more than a decade - Liquid templating with a clear content organization model using front matter and collections **Pros:** - The most direct path to a hosted static site for anyone already using GitHub - Mature theme library makes it fast to get a polished site running - Liquid templating is approachable for developers who aren't deeply familiar with JavaScript build tools **Cons:** - No SSR or ISR capability, so it's limited to purely static projects - Build times are slower than Hugo or Astro, and the gap widens at higher page counts **Best for:** Ruby-native teams and projects built around GitHub Pages, where native hosting integration is the priority over hybrid rendering or build speed. ## [Copy link to heading](#how-to-choose-the-right-static-site-generator)How to choose the right static site generator Picking the right generator comes down to your team's context and where the project is heading. ### [Copy link to heading](#language-and-framework-familiarity)Language and framework familiarity Next.js, Astro, Eleventy, and SvelteKit all run on Node.js, making them a good fit for frontend teams working in [JavaScript or TypeScript](https://vercel.com/i/javascript-vs-typescript). Hugo uses Go templates and removes npm from the CI/CD pipeline entirely, while Jekyll serves Ruby-native teams. If you work across React, Vue, and Svelte, Astro lets you use all three in one project. ### [Copy link to heading](#build-speed-and-rendering-needs)Build speed and rendering needs At smaller page counts, build speed rarely drives the decision. As content grows, generators designed for pure static output tend to be easier to reason about. Hugo is a good example of this, since it can compile thousands of pages in under a second. The bigger question is usually about rendering flexibility. If your project will stay static, Hugo, Eleventy, and Jekyll all work well. If you anticipate personalization or real-time content, Next.js and SvelteKit let you select rendering modes per route in a single application. ### [Copy link to heading](#plugins,-integrations,-and-community)Plugins, integrations, and community Next.js has the widest hybrid-rendering support, with broad CMS integration and an active community producing templates and packages. Hugo handles RSS, sitemaps, and multilingual content without plugins, which keeps the dependency chain minimal. Eleventy gives full npm access for data sources and build tools, while Astro's multi-framework support lets you bring existing React, Vue, and Svelte libraries into one project without rewriting anything. ## [Copy link to heading](#how-to-deploy-and-scale-a-static-site-with-vercel)How to deploy and scale a static site with Vercel Vercel supports static site deployment with framework detection, git-based builds, and distribution across a [global network](https://vercel.com/docs/cdn). ### [Copy link to heading](#zero-config-builds-for-popular-ssgs)Zero-config builds for popular SSGs When you connect a repository, Vercel identifies the framework and applies a preset build command and output directory. Next.js defaults to `next build` with output in `.next`, Astro to `astro build` with output in `dist`. This detection covers the major SSGs, though some projects may need configuration through `vercel.json`. ### [Copy link to heading](#global-delivery,-preview-deployments,-and-incremental-adoption)Global delivery, preview deployments, and incremental adoption Every deployment is distributed globally, with static assets cached at locations closest to visitors. Each pull request generates a unique [preview deployment](https://vercel.com/docs/git) URL for reviewing changes on production-like infrastructure before merging. As projects grow beyond pure static, Vercel lets teams add dynamic capabilities incrementally: - **ISR for page-level updates:** Pages regenerate on a schedule or on demand without rebuilding the entire site. - [**Routing Middleware**](https://vercel.com/docs/routing-middleware)**:** for personalization: Logic runs before the request reaches your origin to customize responses based on geography or authentication. - **Server-rendered routes:** Individual pages that need real-time data use SSR while the rest stay static. These all run on the same deployment pipeline, so the architecture can evolve without re-platforming. ## [Copy link to heading](#start-building-with-a-static-site-generator)Start building with a static site generator For static-only projects, Hugo and Astro are strong choices with fast builds and minimal client-side overhead. For projects growing beyond static, Next.js and SvelteKit offer hybrid rendering in a single framework. Vercel deploys these generators with automatic framework detection and global distribution. [Start a new project](https://vercel.com/new) to deploy your first static site, or [browse templates](https://vercel.com/templates) to see working examples across every major generator. ## [Copy link to heading](#frequently-asked-questions-about-static-site-generators)Frequently asked questions about static site generators ### [Copy link to heading](#what-is-the-difference-between-a-static-site-generator-and-a-cms)What is the difference between a static site generator and a CMS? A static site generator runs code once at build time to produce HTML files served directly to visitors. A traditional CMS like WordPress typically generates pages with server-side code, often backed by a database. If you want familiar authoring tools alongside static delivery, pairing a headless CMS with an SSG and using webhook-triggered builds to publish updates is a common approach. ### [Copy link to heading](#can-a-static-site-generator-handle-dynamic-content)Can a static site generator handle dynamic content? Pure static sites can't provide request-time dynamic features natively, but forms, comments, search, and authentication can be added through third-party services and APIs. For applications needing per-user content or live data, ISR and hybrid frameworks like Next.js preserve static performance for stable pages while rendering dynamic sections per request. ### [Copy link to heading](#are-static-sites-good-for-seo)Are static sites good for SEO? Pre-rendered HTML from a CDN reduces request-time work, which supports faster LCP. Static pages without hydration also avoid JavaScript overhead that can affect INP scores. [On pages where the LCP element was an image, 35% of those images](https://web.dev/articles/top-cwv) had source URLs missing from the initial HTML, a problem pre-rendering solves by including references from the start. Google includes [Core Web Vitals](https://vercel.com/i/how-ai-is-changing-seo) in its page experience signals, and static architectures tend to perform well across those metrics.