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Abstract image of a digital identity surrounded by web technologies that protect online privacy. Building a more private internet

The Privacy Sandbox technologies aim to make current tracking mechanisms obsolete, while giving publishers, developers, and advertisers what they need for their business. Learn more about the Privacy Sandbox proposals, going deeper into how they reduce cross-site and cross-app tracking.

How it works

Dive deeper into Privacy Sandbox's proposals to deliver the key advertising use cases on the web and on Android.

Topics API

The Topics API is a Privacy Sandbox proposal for a mechanism to enable interest-based advertising, without having to resort to tracking the sites a user visits or the apps they use.


The FLEDGE API is a new way to remind you of sites and products you’ve been interested in, without relying on third-party cookies or cross-app identifiers that track your individual activity.

Attribution Reporting API

The Attribution Reporting API is a Privacy Sandbox proposal that will help advertisers measure the performance of their online ads without needing to track people’s activity across websites and apps.

Frequently Asked Questions

You can expect to hear more about the progress being made with the Privacy Sandbox regularly, including more opportunities for you to test these new technologies on your sites and in your campaigns. For the latest news, please follow the blog on developer.chrome.com and sign up for updates at developer.android.com

Google invites members from the industry—web browsers, online publishers, ad tech companies, advertisers, and developers—to participate in the development and testing of the proposed new technologies.

For the open web, you can contribute to the public discussions in forums such as the W3C, and if you’re a business, talk to your trade groups and technology vendors about engaging in this process. If you’re a developer, we invite you to join the origin trials.

For Android, feedback on the design proposals can be given directly via the developer.android.com site. This is also where you can sign up for regular updates as the project progresses.

Developer.chrome.com offers an overview of all the Privacy Sandbox proposals and guidance for testing. It also refers to explainers and discussions on GitHub.

Developer.android.com provides information, design proposals, and updates on the Privacy Sandbox on Android.

News and Updates

  • Maximize ad relevance after third-party cookies

    2023 will be a critical year to prepare for a world without third-party cookies. Let’s take a closer look at how the advertising ecosystem might think about ad relevance in a cookieless future.

    Read more
  • Topics API: Latest Updates

    Updates and enhancements to the design and implementation of the Topics API.

  • Update on Testing the Privacy Sandbox for the Web

    In order to give developers more time to test the new Privacy Sandbox technologies, Chrome is expanding the testing windows for the Privacy Sandbox APIs before we disable third-party cookies in Chrome.