Get your business ready
Read case studies from companies helping to shape the future of online privacy, or learn more about the Privacy Sandbox technologies in our developer documentation.
Privacy Sandbox for the Web
Privacy Sandbox for the Web provides open-source, privacy-enhancing technologies that empower businesses to thrive while respecting user privacy. By reducing reliance on various forms of tracking, we're building a web where companies can achieve their goals and people’s information stays private and secure.
Privacy Sandbox Timeline for the Web
The Privacy Sandbox proposals are in various stages of the development process. This timeline reflects when we expect new privacy-preserving APIs and other technologies to be ready in support of key use cases. Information may change and will be updated monthly.
The proposals are being developed in public forums, in collaboration with members of the industry. We also continue to work with the UK's Competition and Markets Authority in line with the commitments we offered for Privacy Sandbox for the web. We encourage participation through the many public feedback channels that inform development of the proposals. Stakeholders can also use this form to share feedback directly with Chrome.
Last Update: April 2025
Third-Party Cookies (3PC) and Testing
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Opt-in Testing with Labels
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1% 3PC Deprecation
-
Third-Party Cookie Phase Out *
- 2021
- 2022
- 2023
- 2024
Third-party cookies phases: Opt-in testing with labels: Q4 2023 through Q3
2024; 1% Third-party cookies deprecation: Q1 2024 through Q4 2024;
Third-party cookies phase out: Q1 2025
Timeline update pending
Please read our July 2024 announcement for an important update regarding third-party cookies in Chrome.
Timeline update pending
Please read our July 2024 announcement for an important update regarding third-party cookies in Chrome.
* Subject to resolving any remaining concerns with the CMA.
Privacy Sandbox APIs
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Discussion
-
Pre-Launch Testing
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General Availability
- 2021
- 2022
- 2023
- 2024
Fight spam and fraud on the web
Fight spam and fraud on the web proposals phases: Testing period: Q1 2021
through the end of Q3 2022; Transition period, stage 1: Q4 2022 through the
end of Q2 2023; Transition period, stage 2: Q3 2023.
- OT STARTED
- OT CLOSED
Show Relevant Content and Ads
Show relevant content and ads proposals phases: Discussion period: Q1 2021
through the end of Q4 2021; Testing period: Q1 2022 through the end of Q3
2022; Transition period, stage 1: Q4 2022 through the end of Q2 2023;
Transition period, stage 2: Q3 2023
- OT STARTED
- OT CLOSED
- FEATURE FLAG
- OT STARTED
- OT CLOSED
Measure digital ads
Measure digital ads proposals phases: Discussion period: Q1 2021 through the
end of Q4 2021; Testing period: Q1 2022 through the end of Q3 2022;
Transition period, stage 1: Q4 2022 through the end of Q2 2023; Transition
period, stage 2: Q3 2023
- OT STARTED
- OT CLOSED
- OT STARTED
- OT CLOSED
Strengthen Cross-site Privacy Boundaries
Strengthen Cross-site Privacy Boundaries proposals phases: Discussion
period: Q1 2021 through the end of Q1 2022; Testing period: Q2 2022 through
the end of Q3 2022; Transition period, stage 1: Q4 2022 through the end of
Q2 2023; Transition period, stage 2: Q3 2023.
- FEATURE FLAG
- OT STARTED
- OT CLOSED
- FEATURE FLAG
- OT STARTED
- OT CLOSED
- OT STARTED
- OT CLOSED
- OT STARTED
- OT CLOSED
- OT STARTED
- OT CLOSED
The Privacy Sandbox initiative also includes efforts designed to limit covert tracking. These include proposals that address specific covert tracking techniques such as fingerprinting and network-level tracking.
Privacy Sandbox Proposals for the Web
Frequently Asked Questions
- This timeline reflects Chrome’s best estimates, as of April 2025, of the timing of the key Privacy Sandbox use cases, including the availability of origin trials, readiness at scale of the listed APIs, and ending support for third-party cookies. Dates are subject to change. Chrome will update this timeline monthly with current estimates.
- General Availability will start once APIs for all of the use cases are ready for scaled adoption. Chrome will announce the start of the transition period on this site and on the Keyword blog.
- The timeline lists the use cases that Chrome plans to support before the transition period: Fighting spam and fraud on the web; Measuring digital ads; Showing relevant content and ads; Strengthening cross-site privacy boundaries. The APIs listed under each use case reflect Chrome’s current proposals to support this use case. The specific APIs are subject to change.
I understand my personal data will be processed in accordance with Google’s Privacy Policy.