Server-Side Rendering (SSR)
Server-side rendering (SSR) is a rendering approach where a server generates the fully-formed HTML for a page before sending it to the browser (or crawler), rather than sending a mostly-empty page that relies on client-side JavaScript to build the content after loading.
Updated
November 12, 2026
Category
SEO Glossary
SSR is generally the safer choice for SEO compared to pure client-side rendering, since it removes the fetch-and-render delay risk entirely — a crawler receives fully-formed HTML on the very first request, with no need to execute JavaScript and wait for a secondary rendering pass. SSR sits alongside static site generation (SSG, where HTML is pre-built at deploy time rather than on each request) as two common alternatives to client-side rendering; SSR is better suited to frequently changing, personalized, or very large sets of pages, while SSG tends to be faster and simpler for content that doesn't change per-request. The right choice generally depends on how dynamic the content is and how critical fast, reliable indexing is for that specific page type.
Example
A large marketplace site with frequently changing inventory chooses SSR over static generation, since pre-building millions of static pages for constantly changing stock levels isn't practical, while SSR guarantees crawlers still see fully rendered, current content on each request.
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