Google is planning to track billions of credit and debit card sales to compare online ad clicks with money spent offline.
Google Attribution will allow advertisers to see whether online ad campaigns generate offline sales.
Announcing the service, Google said that it captures around 70% of credit and debit card transactions in the US.
Critics said it represented another blow to privacy.
Google announced the new product in a blogpost, saying: "For the first time, Google Attribution makes it possible for every marketer to measure the impact of their marketing across devices and cross-channel - all in one place."
Google has vast amounts of data on net users, from services such as AdWords, Google Analytics and DoubleClick Search which combine details about the ads displayed on devices with what has been searched for in Google.
Google can also collect location information from phones, allowing it to work out when a user has seen an ad, and whether they have searched for the product advertised and gone to an offline shop to buy it.
It introduced store visit measurements back in 2014, using the location data on mobiles to track when people visited a store.
"In under three years, advertisers globally have measured over five billion store visits," it said.
It added that Google's "third-party partnerships" already capture approximately 70% of credit and debit card transactions in the US, but did not reveal who the partners were or how information was captured.
Google will not have access to the details about what individuals spend - instead they learn the value of all purchases in a certain time period.
"While we developed the concept for this product years ago, it required years of effort to develop a solution that could meet our stringent user privacy requirements," a spokesman said.
"To accomplish this, we developed a new, custom encryption technology that ensures users' data remains private, secure, and anonymous."
BBC
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