AI Overviews and the Zero-Click Problem: What the Data Shows
Yes, AI Overviews are reducing clicks to websites — but the honest answer to “by how much” is a range, not a single number. Depending on the study and method, the measured drop lands somewhere between roughly 34% and 61%, and about half of the broader decline was already happening before AI Overviews existed.
That nuance matters, because most of the scary headlines quote one figure as if it were settled. Here’s what the actual data shows, who measured it, and what your business should do about it.
How common are AI Overviews now?
AI Overviews (AIO) have gone from a rollout to a default. They appeared on about 48% of tracked Google queries (BrightEdge, February 2026), up from roughly 31% a year earlier. Other trackers report lower prevalence using different sampling, so treat 48% as BrightEdge-specific — but every method agrees the direction is sharply up.
At the same time, zero-click behavior climbed. 68.01% of US Google searches ended without any click between January and April 2026, up from 60.45% in 2024, per SparkToro’s (Rand Fishkin’s) analysis of Similarweb clickstream data, reported by Search Engine Land. Google publishes no zero-click data of its own, so clickstream panels like this are the accepted way to measure it.
The click-loss range, study by study
Here’s where discipline pays off. Different research designs produce different numbers — so name the study and present the spread rather than cherry-picking.
| Study | Method | Measurement | Click impact |
|---|---|---|---|
| Agarwal & Sen (SSRN working paper) | Pre-registered randomized field experiment; n=1,065 US desktop Chrome users; Jan–Feb 2026 | Outbound organic clicks on triggered queries (0.61 → 0.38 per search) | ~38–40% drop; zero-click rose 54% → 72% when AIO shown |
| Pew Research | 68,879 searches; 900 US adults; March 2025 data | CTR with vs. without an AI Overview (15% → 8%) | ~47% relative drop |
| Across methodologies | Various | Reported CTR decline | ~34–61% range |
The Agarwal & Sen result is the most causally rigorous of the group — a pre-registered randomized field experiment (still an SSRN working paper, not yet peer-reviewed) that found AI Overviews cut outbound organic clicks by roughly 38–40% on triggered queries and pushed the zero-click rate from 54% to 72% when an overview was shown.
Pew Research’s study (March 2025 data) approached it observationally and found click-through of 15% without an AI Overview versus 8% with one — about a 47% relative drop. Pew also found users clicked a source link inside the AI Overview only 1% of the time. Google disputed the sample’s representativeness but not the underlying numbers.
The crucial caveat: AIO isn’t the whole story
Before you blame everything on AI Overviews, note that Ahrefs found roughly half of the recent click decline predates AIO. On-SERP answers, featured snippets, and richer results pages were already siphoning clicks for years. AI Overviews accelerate a long-running trend; they didn’t start it.
That reframes the problem. If half the erosion is structural, chasing an AIO-specific fix alone won’t recover the other half — you need a broader visibility strategy.
What about AI Mode?
Google’s AI Mode is the more aggressive surface. Semrush measured a ~93% zero-click rate for AI Mode across 69M US desktop sessions (May–July 2025). But two qualifiers keep this in perspective:
- It’s an informational-query average. Transactional AI Mode queries still sent about 69% of clicks to sites.
- It was small. AI Mode was roughly 1% of sessions in that study window — real and worth watching, but not yet dominant.
AI Mode is a distinct surface with its own mechanics, not just a louder AI Overview. We break down how it assembles answers in Google AI Mode explained.
Publishers are the canary
News sites show the sharp end of this. Zero-click news searches rose from 56% (May 2024) to 69% (May 2025), and organic search traffic to news sites fell from a mid-2024 peak above 2.3B visits to under 1.7B by May 2025 — about a 26% decline (Similarweb data via Reuters, June 2025, corroborated by TechCrunch). If your content is informational and easily summarized, assume you’re exposed to the same pressure.
What your business should do about it
The takeaway isn’t panic — it’s re-measuring what success looks like when fewer searches end in a click.
- Stop treating rankings as the only scoreboard. Track impressions and citations inside AI answers, not just blue-link clicks. See the AI visibility metrics that actually matter for what to monitor instead.
- Optimize to be the cited source, not just a result. If the answer is read on the page, being the source it quotes is the new front page. Learn how to appear in Google AI Overviews and how AI engines choose which sources to cite.
- Diversify beyond Google. ChatGPT, Perplexity, and Gemini are now real referral surfaces with different rules — see where AI referral traffic is going.
- Prioritize transactional and high-intent pages. These retain far more clicks (AI Mode still sent ~69% of transactional clicks), so protect the content closest to revenue first.
- Read the bigger shift. For the full 2026 picture, start with what actually changed in AI SEO this year.
The click economy is contracting, but visibility isn’t disappearing — it’s moving into the answer itself. The businesses that adapt are the ones measuring their presence inside AI responses, not just their position beneath them.
Want to know exactly how AI engines see your site today — and where you’re being cited or skipped? Get an AI visibility audit.
Frequently asked questions
How much do AI Overviews reduce clicks?
There is no single settled number. A pre-registered field experiment by Agarwal & Sen (n=1,065 US desktop Chrome users, Jan–Feb 2026) found AI Overviews cut outbound organic clicks by roughly 38–40% on triggered queries, while Pew Research (March 2025 data) measured a click-through rate of 8% with an AI Overview versus 15% without — about a 47% relative drop. Across methodologies the reported decline spans roughly 34–61%, so treat it as a range, not one figure.
What is a zero-click search?
A zero-click search is a query that ends without the user clicking through to any website — the answer is read directly on the results page. SparkToro's analysis of Similarweb clickstream data (reported by Search Engine Land) found 68.01% of US Google searches ended without a click between January and April 2026, up from 60.45% in 2024.
Are AI Overviews the only reason clicks are falling?
No. Ahrefs notes that roughly half of the recent click decline predates AI Overviews, driven by earlier changes like richer results pages and on-SERP answers. AI Overviews accelerate a trend that was already underway, so they are a major factor but not the sole cause.
Does Google AI Mode make zero-click worse?
It depends on intent. Semrush measured a ~93% zero-click rate for AI Mode across 69M US desktop sessions (May–July 2025), but that is an informational-query average; transactional AI Mode queries still sent about 69% of clicks to sites. AI Mode was roughly 1% of sessions in that study window, so the effect is real but still small in aggregate.