Google has spent the past few weeks promoting generative AI tools that can summarize search results for users, help them draft essays, and swap out overcast skies for sunshine in otherwise perfect family photos. Today it’s showing off what similar tools could do for its core business—selling ads.

New generative AI systems for advertising clients will compose text on the fly to play off what a person is searching for, and they’ll whip up product images to save them time and money on design work. The features add to the swelling ranks of…