How does Google AI Overview get its information?

RushilFounder, Ru Visibility2 October 2026

Short answer

From Google Search itself. Google says AI Overviews may use “query fan-out”, issuing several related searches across subtopics and data sources, then show links to pages that support the answer. To be one of those links, a page must be indexed and eligible to appear in Search with a snippet.

Which pages can be linked

Google sets the bar plainly: “To be eligible to be shown as a supporting link in AI Overviews or AI Mode, a page must be indexed and eligible to be shown in Google Search with a snippet.” Those links are how an overview sends visitors to websites, so for a business they are the part that matters.

When an overview appears at all

Not on every search. Google's help page says they appear “when our systems determine that generative AI can be especially helpful – for example, when you want to quickly understand information from a range of sources” ( Google Search Help).

What controls what Google uses

For your pages in Search, Google points to the usual controls: “use nosnippet, data-nosnippet, max-snippet, or noindex”. One common mix-up: blocking Google-Extended in robots.txt does not take you out of AI Overviews. Google says it “does not impact a site's inclusion in Google Search nor is it used as a ranking signal in Google Search” ( Google's crawler documentation). What it controls is whether your content may be used to train Google's Gemini models.

What this means for your site

There is no separate AI index to get into. Being indexed, being allowed a snippet, and answering the surrounding questions clearly are what make a page usable. How to get into AI Overviews covers the practical steps.

Sources

Find out what AI says about you.

Send us your web address. We run our own tool on it, free, and send you what it says. The whole thing — not a taster with the useful bits taken out.

Whether AI can even read your site

ChatGPT, Claude, Perplexity, Google and Bing all send a small program to read your pages. We knock on your door as each one and see who gets let in. If they are being turned away, nothing else matters until that is fixed.

Two scores out of 100 — one for Google, one for AI

Plus what is behind each number. Where we could only make a fair guess, we say so instead of dressing it up as a measurement.

A list of fixes, best one first

Ordered by what gives you the most for the least work, so the top of the list is the quickest win. It is yours either way — use it with us or without us.

We ran it on our own site too. It told us what we were getting wrong, and we published that. A tool you will not point at yourself is not worth much.

One thing the free check does not do: actually ask ChatGPT, Perplexity and Gemini for businesses like yours, dozens of times, and count how often your name comes up. That costs us real money each time we run it, so it comes with paid work.