Remarketing in Google Ads: how it works after cookie consent and how to build lists that sell

Remarketing in Google Ads lets you come back with an ad to people who have already been on your site but did not buy or leave an enquiry. Since cookie consent became standard, it works differently than in guides written a few years ago: the audience list is smaller, because only some visitors allow ad personalization. Below we explain how it works today, how many people you can realistically collect and how to set up lists, exclusions and measurement.

What remarketing in Google Ads is

Remarketing (also called retargeting) means showing ads to people who took an earlier action: visited the site, viewed a product, added it to the cart or are on your customer list. Google stores these people on audience lists, and you point campaigns at those lists. You pay to reach people who already know you instead of paying for cold traffic.

The logic is simple: most visitors do not buy on the first visit. They compare offers, return after a few days, wait for a budget decision at work. An ad that reminds them of the product or offer at the right moment shortens that path. It works best as a complement to acquisition campaigns, which we cover in the articles on negative keywords and click costs.

How remarketing works and where Google gets the lists

Remarketing works in three steps: the Google tag records the user’s actions on the site, the user lands on an audience list based on them, and the campaign shows ads to people on that list. Visitor data is collected by the Google tag (or a GA4 tag linked to your Google Ads account), and you create lists in Google Ads or Google Analytics 4 and share them with campaigns.

Each user stays on a list for the membership duration, which you set yourself and which can be at most 540 days. When the user performs another action that meets the list condition, the duration starts over. A short window (7–30 days) suits impulse purchases, a longer one (90–180 days) suits pricier decisions and B2B services, where weeks pass between the first visit and an enquiry.

A list will not start serving right away. For ads to begin showing, the list must contain at least 100 active users from the last 30 days, and until then the campaign is technically correct but shows nothing. Before you plan a budget, check the list size in the account, not only that the tag is installed.

What types of remarketing exist in Google Ads

Google Ads has four main types of remarketing: standard, dynamic, search (RLSA) and customer-list based (Customer Match). They differ in data source and where the ad appears, so the choice depends on what you sell and how much traffic you have.

Dynamic remarketing needs two things: a product feed in Google Merchant Center and events that pass product IDs. If you run a store, a GA4 audit and implementation service usually closes that gap before the campaign launches.

How many people land on a list once cookie consent is in place

Only users who agreed to ad personalization land on a remarketing list, so the list is always smaller than your site traffic. In Consent Mode v2 this is controlled by the ad personalization signal (ad_personalization), and a user without consent is not added to lists, although the tag can still measure conversions in modeled form. We cover the scale of data loss in the article on conversions without cookies.

The practical takeaway: the lower your traffic, the broader your lists need to be. Instead of separate lists for every page, start with a single “all visitors” list and segment only once each segment clears the threshold. The consent banner itself also affects list size: its copy and layout can noticeably shift the consent rate.

How to set up remarketing step by step

Setting up remarketing takes four steps: deploying the tag and consent, creating lists, launching the campaign and checking that the list grows. The first step is the most common source of errors, because a campaign without a correct consent signal collects fewer people than your traffic suggests.

• Tag and consent: deploy the Google tag (or link GA4 to your Google Ads account) and pass consent signals in Consent Mode v2, including user data and ad personalization consent.
• Lists: create audience lists in Google Ads or GA4 with a membership window matched to your buying cycle.
• Campaign: attach the list to a campaign in Demand Gen, YouTube or as observation on Search (RLSA).
• Check: after a few days, review the list size in the account and confirm the ads are actually serving.

If remarketing is meant to work alongside the rest of the account, we run Google Ads campaigns so that lists, measurement and consent are tied together in one rollout, not bolted on afterwards.

Which audience segments are worth creating

The best segments follow the decision stage: the closer the user was to buying, the shorter the window and the more direct the message. Each segment should have its own ad, because someone who abandoned a cart needs a different message than a blog reader.

How to cap frequency and exclude the wrong people

Remarketing burns budget mainly for two reasons: it shows ads to people who already bought, and it shows them too often. So add a buyers list exclusion to every sales campaign and cap frequency where the platform allows it. For display and Demand Gen campaigns, a good starting point is a few impressions per user per week, adjusted afterwards based on results.

Also exclude lists that distort the result: company employees, people from recruitment campaigns and users with a very short visit. If part of your sales closes off the site, passing results back to the account helps, as we describe in the article on offline conversions.

How to measure remarketing performance

You measure remarketing performance by cost per conversion and share of revenue, but you read both carefully, because some people on the list would have bought without the ad. Remarketing collects credit for sales that might have happened anyway, so its result always looks better than that of acquisition campaigns.

• Cost per conversion: compare it with acquisition campaigns, remembering the difference in funnel position.
• Assisted conversions: check whether remarketing closes journeys that began in other campaigns.
• List size: a drop after a consent banner change signals lost audience, not weaker ads.
• Holdout test: switch remarketing off for a chosen group or period and compare sales, if the budget allows.

If you would rather hand the rollout to specialists, our marketing agency builds remarketing together with measurement and consent, so the result can be read without guesswork.