Desktop Impressions Drop After Sept. 10

On September 10th, a lot of us in the SEO world opened up Search Console or our favorite rank-tracking tools and saw something alarming: desktop impressions fell off a cliff. At the same time, average positions ticked up, and some tools started spitting out errors or missing ranking data.

If you panicked and thought your site lost visibility, take a breath. This doesn’t look like a penalty or a ranking algorithm change. What we’re seeing is almost certainly tied to Google modifying how search results are served. Specifically, around a long-standing parameter that SEO tools have relied on for years.

The Root Cause: Google’s &num=100 Change

For years, most rank-tracking tools have used a parameter called &num=100 when pulling search results. That little snippet of code forced Google to deliver 100 results at a time, instead of the usual 10.

It’s been how tools capture large result sets for tracking, competitive research, and reporting. The problem is, around September 10th, that parameter stopped behaving the way it used to. Some queries only returned a couple of pages instead of 100 results. In other cases, the data was incomplete or inconsistent.

And while Google hasn’t officially announced anything, it’s clear that the change is messing with how impressions are recorded and how rank-tracking tools operate. (Search Engine Journal)

The Impact: Why Your Data Looks Different

Here’s what’s really happening under the hood:

• Desktop impressions dropped in Search Console. If your site’s impression graph shows a sharp dip starting Sept. 10, you’re not alone. At the same time, your average position probably looks “better.” That’s not magic SEO, it’s a shift in how impressions are counted.
• Rank-tracking tools broke or showed gaps. Tools that depend on the &num=100 parameter are struggling to pull accurate SERPs. That means less data, fewer results, and in some cases flat-out errors.
• Past data may have been inflated. If bots and tools were hitting Google with &num=100 requests, those extra page loads may have been counted as impressions. In other words, we may have all been looking at slightly “noisy” data. Now that Google has cut it off, impressions look lower, but they may actually be closer to what real users generate.

Why SEOs Should Care

This isn’t just about a blip in impressions. It’s about trusting your data.

• Historical comparisons get tricky. If you compare last month’s inflated impressions to this month’s “cleaner” data, it’ll look like you lost visibility. You didn’t — the measurement method changed.
• Reporting to clients or stakeholders needs context. When you’re explaining a sudden drop, you’ll need to highlight that this was a tool/data collection issue, not a performance decline.
• Tools need to adapt. SEO software providers now face the challenge of capturing results in smaller chunks or finding new methods. That means higher query costs and potentially slower or more limited data.

Bottom line: SEOs need to understand that this wasn’t their fault and shouldn’t rush into unnecessary fixes.

How to Respond Right Now

Here’s how I’m advising teams and clients to handle this:

1. Check your data carefully. Go into Search Console and segment by device. You’ll see that the drop is isolated to desktop impressions, starting Sept. 10.
2. Don’t confuse the drop with lost rankings. Your actual positions in the SERPs haven’t suddenly collapsed. What’s changed is the way impressions are counted.
3. Annotate your reports. Flag September 10th in dashboards, client reports, and historical graphs. Otherwise, people will think something went wrong with your SEO strategy.
4. Stay in touch with your tool vendors. Many tracking platforms are already acknowledging the issue and working on fixes. Follow their updates closely.
5. Rely more on real user data. Rank-tracking tools are helpful, but Search Console and analytics give you the truest view of how real people are finding and engaging with your site.

My Takeaway

If you’ve been in SEO long enough, you know one thing for sure: Google doesn’t owe us stable data pipelines. They make changes all the time, sometimes without a word. What happened on Sept. 10 is just another reminder that we can’t put blind faith in third-party tools or even in the way impressions are counted.

At the end of the day, our job isn’t just to chase metrics, it’s to drive real visibility, traffic, and ROI. This update doesn’t mean your strategy isn’t working. It means the measurement yardstick just got shorter.

Source:

Matt G. Southern, “Google Modifies Search Results Parameter, Affecting SEO Tools,” Search Engine Journal, September 2025. Read the article here.