AdSense Changes How It Counts Impressions — Begin-to-Render From Feb. 17, 2027

Google notified AdSense publishers that it is switching how it counts impressions for display ads. AdSense impression counting moves to a Begin-to-Render (BTR) methodology, counting an impression only once the ad has loaded and started to render on the user's device.

What's Changing

Google wrote: "Currently, AdSense counts an impression when an ad starts to download to a user's device. Beginning on February 17, 2027, we will move to the Begin-to-Render methodology. This means an impression will only be counted once the ad has successfully loaded and has started to render on the user's device."

In short, the impression only counts when the ad fully loads.

What Drops Out

Google said that when the change goes live, "you may see a change in total impressions." That's because "impressions that started to download but never actually rendered will no longer be counted (e.g., if a user left the page before the ad began to render)."

Google's help document adds: "Currently, Ad Manager and AdSense already use or are compliant with begin-to-render for native, app, and video inventory impression counting. The shift to count display ads via BTR unifies our impression counting methodologies."

For Publishers

If you run AdSense on your site, expect impressions and possibly earnings to be lower after Feb. 17, 2027.

But this decline is a measurement change, not a performance decline. What drops out are impressions the user never had a chance to see. Mark the date as a baseline in your reporting so year-over-year comparisons stay readable.

For Advertisers

Advertisers may see more engagement for the same money. Removing non-rendered impressions from the denominator naturally improves metrics like CTR.

That's a definitional change too, not a performance improvement. The gap between platform-reported numbers and actual business outcomes is the same issue behind platforms grading their own homework. And as the recent day of Google Analytics data that vanished entirely showed, it's safest to design reporting on the assumption that measurement can wobble at any time.

There's Time to Prepare

The change lands Feb. 17, 2027 — a big shift for AdSense display ads, but several months out. The useful thing to do now is record current-methodology impression figures separately so you can compare across the transition.