Google will now deliver more relevant ads, if you opt in.

The next time you sign into a Google service, you might see an alert that asks you to “Turn on Ads Personalization.” If you say yes, Google will “use your Google Account activity and information on Google services (ex: Search, YouTube) as well as your browsing data from websites and apps that partner with Gooogle” to serve up ads that are most relevant to you, according to a screenshot from Gmail on Chrome posted by Recode(Opens in a new window).

Previously, Google served up ads based only on Google account activity; outside sites and apps were handled by cookies(Opens in a new window). Now, however, you can lump everything together and control it all in a new dashboard known as My Activity(Opens in a new window). There you’ll see recent activity, which you can filter by date and product. If you don’t want some of that data to factor into the ads you see, delete it.

A separate portal(Opens in a new window) lets you add or dismiss ad topics (humor, finance, smart phones, fitness, etc.) and choose whether or not you want to see ads based on those interests with the click of a button.

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As Recode notes, the opt-in move is “a way for Google to get ahead of the growth in ad-blocking” while avoiding backlash from privacy advocates.