How Gmail ads work
When you open Gmail, you'll see ads that are the most useful and relevant to you. The process of selecting and showing personalised ads in Gmail is fully automated. These ads are shown to you based on your online activity while you're signed in to Google. We will not scan or read your Gmail messages to show you ads.
Privacy, transparency and choice
Google does not sell your personal information, which includes your Gmail and Google account information. We also do not share your personal information with advertisers unless you have asked us to.
We're careful about the types of content that we serve ads against. For example, Google will not target ads based on sensitive information, such as race, religion, sexual orientation, health or sensitive financial categories. Ads displayed in Gmail are subject to the Gmail ad policies.
To opt out of the use of personal information for personalised Gmail ads, go to the Ads settings page, then turn off Ads personalisation. If you do opt out, you may still see Gmail ads, but they will not be based on personal data Google has associated with your Google Account.