A sharp fall in Google Search Console (GSC) impressions has rattled site owners over the past week. The timing lines up with a quiet change inside Google Search: the retirement of a long-standing URL parameter that once let people (and tools) request 100 results on a single page. This is not a ranking penalty or a traffic collapse. It’s a measurement shift—and it can be explained.
What changed, and when?
Between 12 and 14 September 2025, Google disabled support for the results-per-page parameter that powered num=100. In practice, that means Search now serves 10 results per page, with no way to force 100 in one hit. Google has confirmed the change, and industry tracking shows widespread effects on reporting and rank-tracking tools.
Multiple analyses show the impact is broad. One study of 319 properties found 87.7% recorded lower impressions after the parameter’s removal, which mirrors what many teams are seeing in GSC and third-party dashboards.
How GSC actually counts impressions
GSC only counts an impression when a result appears on the page the user views. If your page sits on page 2 and the user never reaches that page, no impression is recorded. That rule applies to classic results and to many Search features.
When num=100 worked, a single page load could display positions 1–100 at once. Pages ranking 11–100 were credited with impressions without the user clicking to page 2 or beyond. With the parameter gone, a result outside the top 10 now needs the user to paginate before an impression registers. That simple mechanics change explains the sudden drop.
Why your numbers shifted
Many rank-tracking systems relied on num=100 to collect results efficiently. Those bulk fetches inflated the pool of “page views” where rankings beyond the top 10 could accrue impressions. Remove the parameter and those non-paginated views vanish; impressions fall, average position often looks better, and clicks remain steady. Reports across the industry document this exact pattern.
Google representatives have acknowledged the impressions dip and the average-position lift being reported, tying the trend to the same change that has disrupted third-party tools.
Who is most affected?
Sites with a long tail of queries where URLs sit outside the top 10 will see the largest declines in impressions, especially on desktop where pagination behaviour is more pronounced. Agencies and in-house teams that benchmarked “visibility” using impression totals will feel the shift most keenly. Early agency write-ups and local analyses show the same pattern: big impression drops, steadier clicks.
A quick way to verify it’s the parameter change
- In GSC, compare the past 28 days with the prior 28 days.
- Check Clicks and CTR alongside Impressions and Average position.
- Segment by device and country; then add a position filter for queries where the average position is >10.
If impressions fall sharply while clicks hold, and queries beyond the top 10 lose most of their impressions, you’re seeing the measurement change rather than real demand loss.
What to change in your reporting
- Annotate mid-September 2025 across dashboards and decks so future readers understand the structural break.
- Re-baseline KPIs that depend on impressions or average position. Treat data before and after mid-September as separate eras.
- Re-focus on clicks and conversions. These tie to actual visits and revenue; they’re far less affected by the parameter’s retirement.
- Update rank-tracking settings. Expect tool vendors to adjust crawl strategies and, in some cases, pricing—fetching 10 pages costs more than one.
What this change does not mean
It doesn’t mean Google “took away traffic”. GSC impressions are a visibility metric based on what appears on a viewed page. Because that page now shows fewer results by default, fewer low-ranking URLs earn impressions. Your real-world presence in Search may be unchanged, which is why many teams report steady clicks despite falling impression totals.
Practical steps for teams and clients
• Prioritise top-10 placement on queries that matter. Impressions for positions 11–20 now depend more heavily on actual user pagination.
• Revisit content targeting. Consolidate thin, low-intent pages that rarely break into the first page.
• Strengthen on-SERP appeal. Titles and descriptions still influence click-throughs where you do appear.
• Monitor Search features. Some features only count an impression when expanded or scrolled into view, which can make totals look erratic.
• Communicate early. Explain the timing and the mechanism to stakeholders. Use side-by-side charts that show stable clicks versus falling impressions to keep confidence high. Industry round-ups can help underpin the narrative.
Looking ahead
Expect a cleaner—but smaller—impression baseline. Visibility metrics should better reflect what real users actually view, not what bulk collection tricks could load. Keep your eye on the signals that map to outcomes: clicks, engaged sessions and leads. If anything, the retirement of num=100 nudges everyone towards a healthier way of reading GSC: focus on quality of presence, not the sheer volume of times a URL happened to sit on a screen.
Ready to steady your GSC reporting?
If your impressions dipped after the end of num=100, Myoho Marketing can help. We’ll review your Google Search Console set-up, re-baseline your dashboards, and outline practical steps to lift key pages into the top ten.
- Compact GSC audit with clear recommendations
- Reporting that separates the pre- and post-change eras
- Action plan for titles, internal links, and on-page improvements
Book a 20-minute consultation and get your visibility metrics back on solid ground.
