Static Site Generation (SSG): Complete Beginner Guide

What is SSG?

Static Site Generation (SSG) means pages are rendered into HTML at build time, before users request them.

The deployed output is static files served from CDN/static hosting, often with very fast response times.

How SSG works technically

1. Build starts in CI/local.
2. Framework renders predefined routes.
3. HTML files are generated for each route.
4. Assets (CSS/JS/images) are linked.
5. Output is deployed to static hosting/CDN.
6. User requests are served with prebuilt HTML instantly.

Core characteristics

• Rendering happens at build time.
• Runtime serving is simple and fast.
• Excellent reliability and low operational overhead.
• Content updates require rebuild/redeploy.

Advantages

• Fast global delivery through CDNs.
• Low hosting cost and minimal backend complexity.
• Strong SEO because HTML is pre-rendered.
• High scalability for traffic spikes.

Disadvantages

• Rebuild needed after content changes.
• Large sites with many routes can have long build times.
• Harder to handle highly dynamic per-user content directly.

Best use cases

• Blogs and knowledge bases.
• Documentation portals.
• Marketing websites and landing pages.
• Portfolio and company websites with predictable routes.

When SSG is a poor fit

• Real-time pages changing every request.
• Heavily personalized content by user/session.
• Massive route catalogs without incremental build strategy.

Implementation checklist

• Keep route source deterministic at build time.
• Use content pipelines (Markdown/CMS export) for updates.
• Add cache busting for assets.
• Automate rebuilds on content publish.
• Use edge/CDN headers for efficient delivery.

Quick decision rule

Choose SSG when pages are mostly predictable and you want maximum speed with minimum runtime complexity.