The Protected Audience API: experiment and participate

Quick guide to implement and test the API. Set up privacy-preserving ad auctions to serve remarketing and custom audience use cases.

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The Privacy Sandbox Relevance and Measurement origin trial ended September 20, 2023 and the APIs are now available for 99% of Chrome users, and origin trial enrollment is now closed. To keep abreast of the percentage of users each API is enabled for, refer to the Chrome status graphs.


FLEDGE has been renamed to Protected Audience API. To learn more about the name change, see the blog post.

Learn the essentials

Try the API


Read about feature detection to learn how to determine if a feature is available before attempting to use it.

  1. Learn how to use the Protected Audience API.
  2. Try the demo.
  3. Experiment with the API.
  4. Review the Protected Audience status for updates on the implementation of the Protected Audience API. Review the pending Protected Audience capabilities for more details.

The Protected Audience API explainer provides more detail about feature support and constraints.

Get support

Is anything blocking you from experimenting with the API? Ask a question about your implementation, the demo, or the documentation:

For bugs and issues with the implementation of the Protected Audience API in Chrome:

Join the discussion

Everyone is welcome to join in discussion of the Protected Audience API. In particular, if you're experimenting with the API, your feedback is essential.

Discuss the API

Like other Privacy Sandbox APIs, this API is documented and discussed publicly.

Discuss industry use cases in the Improving Web Advertising Business Group.

Give feedback

Privacy Sandbox feedback explains how to provide other types of feedback, and how to engage in discussion of Privacy Sandbox APIs.

Get updates

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