Your GSC Impressions Are About to Drop — And That's Good News

Your GSC Impressions Are About to Drop — And That's Actually Good News

If you check Google Search Console regularly, you're going to see something unsettling in the coming weeks: your impressions will drop — possibly sharply. Before you call an emergency meeting or blame your SEO agency, here's what's actually happening.

Google confirmed a logging error that has been inflating impression counts since May 13, 2025. The fix is rolling out now. When it lands, impressions will fall. That drop is not a performance decline. It is the data becoming accurate again. (Source: Search Engine Land)

This Is the Second Distortion in 2025

What makes this more complicated — and more important to understand — is that this is not the first time GSC impression data was corrupted this year.

Earlier in 2025, bots began exploiting Google's &num=100 search parameter, which returns 100 results per page instead of the standard 10. Each of those bot queries registered as 100 impressions in GSC rather than 10. The result: impression counts were artificially inflated, likely from around February 2025 onward.

Google eventually disabled the &num=100 parameter on September 12, 2025. The next day, impressions across the industry fell 30–70% overnight — a cliff drop that confused and alarmed a lot of marketing teams. Brodie Clark, the SEO consultant who first documented this pattern, called it the "Great Decoupling." (Source: Brodie Clark)

So to be precise: you are not dealing with one data quality problem. You are dealing with two sequential distortions that together have made GSC impression data unreliable for the better part of a year.

The Uncomfortable Implication

During the period when impressions were rising — particularly through late 2024 and into 2025 — a widely-cited narrative emerged: AI Overviews were causing a surge in zero-click searches. Impressions up, clicks flat. The story wrote itself.

Brodie Clark has directly raised the question that should make anyone using that narrative pause: was the "Great Decoupling" built on polluted data? If bot-driven &num=100 queries were inflating impressions while clicks remained unaffected, then the apparent rise in zero-click behavior may have been a measurement artifact rather than a real behavioral shift. We may have been explaining a pattern that was never actually there.

This doesn't mean AI Overviews have no impact on click behavior — they do. But the scale of that impact is now genuinely unclear, and any analysis using GSC impressions from roughly February 2025 onward should be treated with caution.

What This Means for Your Data

Three practical implications for how you read your GSC reports right now:

Sites ranking in positions 11–100 were disproportionately hit. Bot impressions inflated deep-ranking pages most, since the &num=100 parameter returns results far beyond the first page. If your site has content ranking in that range — glossary pages, long-tail content, older posts — those numbers were likely the most distorted.

Year-over-year comparisons spanning May 2025 onward are unreliable. Any impression trend that starts before the fix date and ends after it is crossing a data boundary. Do not use that comparison to draw conclusions about organic performance.

Your CTR will appear to rise. When inflated impressions fall away while clicks remain stable, click-through rate goes up mathematically. That is not an improvement in your content or rankings. It is arithmetic correcting itself. Do not report it as a win.

The clean signals in this environment are clicks, GA4 sessions, and conversions. Those metrics were not affected by either distortion. If clicks are stable or growing, your organic performance is stable or growing. That is the only number worth anchoring to right now. If you need help setting up reliable measurement and analytics, that's something we work with every day.

What to Do This Week

Three actions, none of them complex:

1. Add annotation points in GSC. Set September 13, 2025 (the &num=100 parameter kill date) and the current fix rollout date as named annotations. Anyone reviewing historical data needs to know they are looking across a data discontinuity.

2. Rebaseline your impression reporting. Any dashboard or report that benchmarks against pre-September 2025 impressions is benchmarking against inflated numbers. Establish a new baseline using post-September 13, 2025 data only.

3. Switch your primary organic KPI to clicks. Not just as a temporary measure — permanently. Clicks represent actual user behavior. Impressions represent Google's count of when your URL was eligible to appear, which turns out to be a much noisier signal than most people assumed. Building your reporting around clicks, sessions, and conversions is a core part of a solid growth process.

The Takeaway

A drop in GSC impressions is not a crisis. It is a correction. Your real organic performance is measured in clicks, sessions, and leads — and those numbers have been telling you the truth all along. Trust them.

If you're unsure whether your current reporting setup gives you an accurate picture of organic performance, or if you want help rebaselining your dashboards after these data distortions — book a free measurement audit. We'll review your analytics stack and make sure you're making decisions on clean data.