If you advertise on Facebook or Instagram and run the Meta Pixel on your site, Ads Manager may be showing more purchases this week than last. Sales did not necessarily move. Meta added a setting to Events Manager called Measure conversions on customer devices, and its Business Help Center says it is turned on by default. Under the toggle, Events Manager shows the line "Measurement starting November 12, 2026". Advertisers were first notified in mid-October, and the notice said no code changes were needed.
The setting is not active for people located in the European Union or the United Kingdom. Everywhere else, an eligible pixel got it without anyone choosing it. That covers the US, Israel and every other market outside those two.
How a purchase gets credited now
Meta explains the gap with a lamp. Someone sees an ad on Instagram, visits the advertiser's site two days later and buys. Meta has the ad view, and often receives the purchase event through the pixel, but it cannot always connect the two.
With the new setting, the match happens on the shopper's own device, where both the ad view and the purchase are present. It uses details the customer already gave the business, such as an email address, plus temporary device information that Meta describes as non-identifying. Meta says no identifying customer information reaches it in this step. It only receives confirmation that a purchase happened and which campaign gets the credit.
Your attribution window and attribution model stay as they were. The setting changes which purchases can be measured, not how credit is split. It runs alongside the existing pixel and Conversions API setup and replaces neither.
Two conditions decide whether your site is in
Meta lists two requirements. The pixel must be installed directly on the page, not inside an iframe and not as an image-only pixel. And the site must require people to log in to an account with an email address or a mobile number.
| Your site | Does the setting apply? |
|---|---|
| Store with customer accounts and email or phone login | Yes, on by default |
| Store where shoppers check out as guests | No, under Meta's stated condition |
| Lead-generation landing page with no accounts | No |
| Pixel embedded in an iframe or as an image | No |
The login rule narrows the change mostly to online stores and sites with a member area. A business collecting leads through a simple form is unlikely to see a difference. Meta does not say what happens on an eligible site when a particular shopper never logs in.
Better numbers in the report, same sales in the bank
A tracking-tools company that analysed the rollout expects advertisers to see more attributed conversions and more conversion value. Reported cost per acquisition could fall and return on ad spend could rise, even when real sales and ad spend stay exactly the same. The extra purchases are ones that already happened and now get tied to an ad.
Meta itself gives "Improve campaign performance with a stronger signal" as a reason to keep the setting on. In other words, the additional purchases do not stay in the report. They also feed the system that decides who sees your ads.
The checks to run this week
The toggle sits in each pixel separately: Events Manager, then Data sources, select the pixel, open Settings, and look below the Meta Pixel settings section. If you run several sites or several pixels, check each one.
If you set budgets from the cost per purchase that Ads Manager shows, mark 12 November in your calendar as a break in the series. A comparison between October and late November now includes a change in measurement, and it lands in the heaviest sales month of the year, where a jump looks natural. The simple test is to compare the purchases Meta credits to campaigns with the real number of orders on your site, and with the monthly revenue report your business already produces. When the gap between them suddenly widens, the measurement changed.
Meta's help page also reminds advertisers that it is their responsibility to make sure the integration does not send prohibited information to Meta. Responsibility came up earlier this month around the new terms Meta proposed for advertisers. Google is also changing what advertisers see, with a Google Ads card that shows the money saved on invalid clicks.
For a business in Israel the setting arrives with no action needed, since Israel sits outside the EU and UK exclusion. If you would rather compare months on the old basis, you can switch it off until after the November sales and turn it back on in December. If you leave it on, remember that from 12 November the numbers in Ads Manager are measured with a different ruler.