Static Site Generators: What They Are & When to Use One
Updated: 2 days ago
A static site generator (SSG) turns templates, content files, and data into a complete set of pre-built HTML pages at build time, not per request. Every visitor gets the same pre-rendered HTML file pulled directly from a CDN, with no database query and no per-request rendering bottleneck.
That single architectural decision makes SSGs the default choice for documentation sites, marketing sites, blogs, and increasingly the frontend layer of headless commerce stacks. Understanding when a static generator is the right fit, and when it isn't, is the key decision in any headless architecture project.
Quick Answer: A static site generator pre-builds every page of your site as static HTML files at deploy time. Those files are served from a CDN with no runtime processing, which makes static sites fast, cheap to host, and low-maintenance. Choose an SSG when your content changes predictably and you can tolerate a build step between edits and publication.
What a Static Site Generator Actually Does
At its core, an SSG is a build tool. You feed it content (Markdown files, a headless CMS content API, local JSON) and templates (React components, Nunjucks, Go's html/template), run the build command, and it outputs a /dist folder of .html.css, and .js files. Deploy that folder to a CDN and you're done, there's no application server to provision, patch, or scale.
The contrast with a server-rendered application is direct: in SSR, a request arrives, the server fetches data from a database, renders a page, and returns it. Each request is a round trip through compute. With an SSG, that work happened once at build time; the CDN just returns a file.
The nuance: build time is now runtime. Shipping an SSG doesn't eliminate compute, it moves it from the request cycle into your CI/CD pipeline. A site with 50,000 pages and complex data fetching can take 10–20 minutes to build on every content change, which matters if your editorial team expects near-instant publish. This is the architectural constraint that SSGs trade a fast request path for.
When to Use a Static Site Generator
SSGs are the right default in four situations:
Content changes on a schedule, not continuously. Documentation, marketing landing pages, blogs, and company sites are updated in batches. SSGs are the wrong choice for user-generated content, live inventory, or any data that must reflect sub-second changes in the database.
SEO performance is critical. Pre-built HTML is indexed immediately, no JavaScript execution required. Core Web Vitals scores on SSG sites are consistently stronger than equivalent server-rendered builds with uncached responses.
Security surface matters. No database connection means no SQL injection vector. No application server means no runtime CVEs to patch mid-quarter.
Hosting budget is a constraint. Serving pre-built files from a CDN costs a fraction of keeping an application server warm. A marketing site that costs $50/month on a managed Node.js host often costs under $5 on Cloudflare Pages or Netlify's free tier.
Here's the subtlety: the binary between "static" and "dynamic" dissolved around 2020. Every major modern SSG, Next.js, Astro, SvelteKit, supports incremental static regeneration (ISR) or per-route SSR alongside static output. The real question isn't "should I use an SSG?" but "which pages need runtime compute, and which don't?"
How the Build Pipeline Works
Content ingestion. The SSG fetches content from a source, local Markdown files, a headless CMS API (Wix Headless, Contentful, Sanity), or a local database, during the build.
Template rendering. Each content item is passed through a template to produce an HTML file. A blog with 400 posts produces 400 .html files.
Asset processing. CSS is bundled and minified, images are optimized, JavaScript is tree-shaken.
Output. The completed /dist folder is deployed to a CDN. The CDN handles serving; the build tool's job is finished.
For headless architectures, step 1 is where the choice of content backend matters most. An SSG pulling from a structured content API at build time has significantly less per-page overhead than one making N+1 API calls per rendered page.
Popular Static Site Generators: How They Compare
SSG | Language / Runtime | Best For | Default Render Mode | GitHub Stars |
Next.js | React / Node.js | Full-stack apps, hybrid SSG+SSR | Hybrid (SSG + SSR + ISR) | ~128K |
Astro | Multiple UI frameworks | Content sites, zero-JS default | SSG with opt-in islands | ~47K |
Hugo | Go | Large-scale docs, build speed | Pure SSG | ~75K |
Eleventy (11ty) | JavaScript | Flexibility, minimal opinions | Pure SSG | ~17K |
Gatsby | React / GraphQL | Data-heavy content sites | SSG with deferred hydration | ~55K |
SvelteKit | Svelte / Node.js | SPA + SSG hybrid | Hybrid (configurable per route) | ~19K |
Next.js is the de facto choice when you need both SSG and SSR in the same codebase. Partial Pre-rendering (PPR), stabilized in Next.js 14+, lets you stream server-rendered shells around statically cached content.
Astro is the most interesting option for content-heavy sites in 2026. Fred K. Schott, Astro's creator, built it around "removing all JavaScript from your final build by default", components render to static HTML, JavaScript loads only for interactive islands. (Source: "Introducing Astro: Ship Less JavaScript," astro.build, June 2021.)
Hugo wins on raw build performance: thousands of pages per second. Right choice when content volume is large and you don't need a React ecosystem.
Eleventy is architecturally the simplest, no forced component model, wide templating language support. Good fit for teams that want precise control over output.
Want to see how Wix Headless connects to a static frontend at build time? Read the Wix Headless architecture docs
SSGs and Headless CMS: How They Fit Together
An SSG without a content backend is a developer tool. An SSG connected to a headless CMS is a publishing system.
In a headless architecture, the CMS stores and structures content independently of any frontend. The SSG fetches that content at build time via the CMS's content API, renders it into HTML pages, and deploys them to the CDN. Editors update content in the CMS; a webhook triggers a new build; the CDN cache updates.
Wix Headless exposes this CMS layer, plus ecommerce, bookings, members, and other business modules, through the same REST/SDK API your SSG calls at build time. As Shahar Talmi, GM of Wix's Developer Platform, noted in June 2026: "when someone spins up their next project, they can have a complete Wix business backend ready to build on, without ever leaving their terminal." That's the promise of a managed headless backend: your SSG gets a production-ready API without provisioning the services behind it.
The nuance: not all headless CMS APIs behave consistently at SSG build time. APIs with aggressive rate limiting or draft/publish state inconsistencies can make builds slow or brittle. Before committing a content API to your SSG's build pipeline, verify its bulk-fetch behavior, pagination, limit params, concurrent request tolerance, under build conditions, not just single-item fetches.
FAQ
What is a static site generator?
A static site generator is a build tool that takes content and templates as input and outputs a folder of static HTML, CSS, and JavaScript files. Those files are deployed to a CDN and served with no database or server-side rendering at request time.
What's the difference between a static site and a dynamic site?
A static site serves the same pre-built HTML to every visitor. A dynamic site generates HTML on each request by querying a database and running server-side code. Static sites are faster and cheaper to host; dynamic sites can show personalized or real-time content.
Is Next.js a static site generator?
Next.js is a hybrid framework supporting SSG (getStaticProps), SSR (getServerSideProps), and ISR. It's more accurate to call it a full-stack React framework with SSG as one of its rendering modes.
Do static site generators work with a headless CMS?
Yes, this is one of the primary use cases. An SSG fetches content from the CMS API at build time, renders it into HTML pages, and deploys the result. Most major headless CMS platforms (including Wix Headless) provide REST APIs or SDKs that SSGs can call during the build step.
What are the disadvantages of static site generators?
The main disadvantages are build time (large sites can take minutes to rebuild), lack of per-user personalization without JavaScript, and the overhead of managing a CI/CD pipeline. Sites with frequently changing data, live inventory, user feeds, real-time prices, are poor fits for a purely static approach.
Is Gatsby still worth using in 2026?
Gatsby remains viable for teams invested in its GraphQL data layer. For new projects, Astro and Next.js have largely displaced it. Gatsby's build performance on large sites is also slower than Hugo or Astro.
Static site generators remain one of the most pragmatic architectural choices in the headless stack: they separate the build concern from the serve concern, push complexity into CI/CD rather than runtime, and produce output that is fast and cheap to deliver at scale.
If your content changes predictably and your pages don't need to reflect real-time per-user state, an SSG is almost certainly the right default. Add server-rendered routes at the framework level for the pages that need runtime compute.
When choosing what to pair with your SSG at the backend layer, consider what your build pipeline needs: structured content API, commerce, membership, bookings, or a combination. Wix Headless provides all of these as a single managed backend, API-first, so your SSG calls the same endpoints for CMS content, product catalog, and checkout state.
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