You upload a list of customer contact information, which is hashed and matched against signed-in Google accounts. You can then bid higher for past customers searching again, show them tailored upsell messages, exclude existing customers from acquisition campaigns, or use the list as an audience signal so Performance Max and Demand Gen find similar people.
Customer Match is one of the most valuable ways to put first-party data to work as third-party cookies fade. It requires following Google's customer-data policies, collecting data with appropriate consent, and refreshing lists regularly — ideally through an automated CRM connection rather than manual uploads.
Example
A home-services company uploads its past customers so returning homeowners searching 'AC tune-up' see a loyal-customer offer, while new-customer campaigns exclude them.
How Sloss Digital uses it
We connect clients' CRMs to Customer Match so lists stay fresh, then use them for retention offers, exclusions, and as seeds for AI-driven prospecting.