Protected audienceLimited availability

The protected audience API facilitates advertisement sales by allowing sites to register users as part of an interest group or to choose which ads appear based on those interest groups, while minimizing the ability of advertisers to track specific members of the interest group. Also known as FLEDGE.

Not yet supported in all major browsers — check the table and provide a fallback.

Discouraged: Following the announcement that Chrome will maintain its current approach to third-party cookies, Chrome decided to withdraw certain Privacy Sandbox features including the protected audience API.

How to use ↓Compare browsers

Browser support

DesktopChrome

1–133Not supported

134+Supportedsince Mar 4, 2025

Current: 155

Edge

✕Not supportedup to 154

Current: 154

Firefox

✕Not supportedup to 157

Current: 157

Safari

✕Not supportedup to 27

Current: 27

MobileChrome Android

18–133Not supported

134+Supportedsince Mar 4, 2025

Current: 155

Firefox Android

✕Not supportedup to 157

Current: 157

Safari iOS

✕Not supportedup to 27

Current: 27

How to use

Not supported in Edge, Firefox, Safari, Firefox Android, Safari iOS. Use feature detection below and provide a fallback (or a polyfill) for those browsers.

Example

Full syntax and examples are on MDN — see the links below.

Feature detection

JS · check before using

if ("ProtectedAudience" in globalThis) {
  // ProtectedAudience is available
} else {
  // load a polyfill or use a fallback
}

Specification

wicg.github.io/turtledove ↗

Sub-features

Support for each part of the feature (14). The overall table above shows when the whole feature works.

Sub-feature	Chrome	Edge	Firefox	Safari	Chrome Android	Firefox Android	Safari iOS
HTMLIFrameElement.adAuctionHeaders	122	✕	✕	✕	122	✕	✕
Navigator.canLoadAdAuctionFencedFrame	128	✕	✕	✕	128	✕	✕
Navigator.clearOriginJoinedAdInterestGroups	128	✕	✕	✕	128	✕	✕
Navigator.createAuctionNonce	128	✕	✕	✕	128	✕	✕
Navigator.deprecatedRunAdAuctionEnforcesKAnonymity	128	✕	✕	✕	128	✕	✕
Navigator.getInterestGroupAdAuctionData	132	✕	✕	✕	132	✕	✕
Navigator.joinAdInterestGroup	128	✕	✕	✕	128	✕	✕
Navigator.leaveAdInterestGroup	128	✕	✕	✕	128	✕	✕
Navigator.protectedAudience	128	✕	✕	✕	128	✕	✕
Navigator.runAdAuction	128	✕	✕	✕	128	✕	✕
Navigator.updateAdInterestGroups	128	✕	✕	✕	128	✕	✕
ProtectedAudience	127	✕	✕	✕	127	✕	✕
ProtectedAudience.queryFeatureSupport	127	✕	✕	✕	127	✕	✕
SharedStorageWorkletGlobalScope.interestGroups	134	✕	✕	✕	134	✕	✕