prerendering
Also called: prerender, pre-rendering, static rendering
Prerendering is generating a page's full HTML ahead of the request, so crawlers and browsers receive ready-made markup instead of running JavaScript to build it. In SEO it usually means static rendering at build time (SSG); Chrome also uses "prerender" for speculatively loading a likely next page.
Two things called “prerendering”
Both mechanics produce finished HTML in advance, but they solve different problems.
Build-time prerendering (static rendering, SSG). web.dev defines it as running a client-side app at build time to capture its initial state as static HTML. Every URL ships as a pre-built file, so time-to-first-byte stays low and a crawler sees complete markup without executing your bundle. The page is not automatically interactive; the shipped JavaScript still has to hydrate it.
Prerender-for-crawlers (dynamic rendering). A service detects a bot and serves it a rendered snapshot. Google now calls dynamic rendering “a workaround and not a long-term solution” and recommends server-side rendering, static rendering, or hydration instead.
A newer, browser-side sense also exists: Chrome’s Speculation Rules API prerenders a likely next page in an invisible tab, then swaps it in on navigation for near-instant loads (near-zero LCP). That is a speed feature, not an indexing one.
{ "prerender": [ { "where": { "href_matches": "/product/*" } } ] }Googlebot does render JavaScript, but on a queue and within a budget, and a single render error can hide a page’s content. Prerendering removes that dependency by handing the crawler readable HTML on the first pass.
How it affects your traffic
If your site is a JavaScript SPA that renders on the client, Googlebot has to fetch, queue, and execute your bundle before it sees any content, and one script failure can push a page into "crawled, not indexed." Prerendering (or server-side rendering) gives the crawler complete HTML on the first request, which usually means faster indexing, fewer dropped pages, and content that AI answer engines can actually quote. Choosing the right rendering mode and verifying what Googlebot receives is core Technical SEO work.
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