Google Ads Is Automatically Enabling Conversion-Based Customer Lists

Google announced on 19 June 2026 that it will automatically enable conversion-based customer lists for eligible advertisers, with data processing set to begin on 18 August 2026.

The update applies specifically to advertisers who already have both Enhanced Conversions and Customer Match active in their accounts but have not yet enabled conversion-based customer lists. For those accounts, Google will create and populate these lists automatically, making them available for use in campaign and ad group targeting without any setup required.

What Conversion-Based Customer Lists Are

Conversion-based customer lists are audience segments built from first-party data collected through conversion events. When a user completes a conversion action tracked in your Google Ads account, their data feeds into a customer list that can then be used to reach similar or returning users across Google’s ad inventory.

The feature sits at the intersection of Enhanced Conversions, which improves conversion measurement accuracy by using hashed first-party data, and Customer Match, which allows advertisers to upload customer data directly to Google for audience targeting. 

Conversion-based customer lists use the data flowing through both of those systems to build audience segments automatically, rather than requiring manual list creation or uploads.

The practical benefit is an audience-building capability that updates continuously based on real conversion activity, with no additional implementation work once the underlying systems are in place.

Who This Affects and What Happens Next

The auto-enrolment applies to accounts meeting two conditions: Enhanced Conversions must be active, and Customer Match must be enabled. Advertisers already using both but without conversion-based customer lists will see Google begin generating those lists from 18 August.

Once created, the lists appear within the account and are available to attach to campaigns and ad groups as part of an audience targeting strategy. Google does not automatically attach them to live campaigns. The decision to use them, and how to use them, remains with the advertiser.

For accounts that meet the eligibility criteria, this represents a meaningful addition to the available audience toolkit without requiring any configuration work on the advertiser’s part.

The Opt-Out Window

Advertisers who prefer not to have conversion-based customer lists generated automatically have until 18 August 2026 to opt out. The setting is available within Google Ads account settings under the audience management section.

After that date, Google will begin processing data and the lists will be created. Opting out ahead of the deadline is the only way to prevent automatic enrolment for accounts that meet the eligibility criteria.

This is worth flagging for account managers and agencies overseeing multiple accounts. The deadline applies across all eligible accounts, and the default outcome, if no action is taken, is automatic enrolment.

Why Google Is Moving in This Direction

The update reflects a consistent strategic direction Google has been pursuing across its advertising products: making first-party data more accessible and actionable for advertisers, particularly as third-party cookie deprecation continues to reshape how audiences are built and targeted across the web.

Conversion-based customer lists fit that direction precisely. They give advertisers a way to build relevant audience segments from data they have already collected through their own customer interactions, without relying on third-party signals. The automatic enrolment lowers the barrier to entry for advertisers who have the underlying infrastructure in place but have not yet activated this specific capability.

For performance-focused advertisers already running Enhanced Conversions and Customer Match, the lists generated through this update are worth evaluating carefully once they become available. Audience segments built from actual conversion data tend to carry stronger intent signals than broader interest-based segments, and incorporating them into campaign targeting is a straightforward way to put existing first-party data to work more effectively.