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What is the Privacy Sandbox? | Google for Developers
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href="/extras.css"></head> <body class="" template="page" theme="white" type="article" layout="docs" concierge='closed' display-toc pending> <devsite-progress type="indeterminate" id="app-progress"></devsite-progress> <section class="devsite-wrapper"> <devsite-cookie-notification-bar></devsite-cookie-notification-bar><devsite-header role="banner"> <div class="devsite-header--inner nocontent"> <div class="devsite-top-logo-row-wrapper-wrapper"> <div class="devsite-top-logo-row-wrapper"> <div class="devsite-top-logo-row"> <button type="button" id="devsite-hamburger-menu" class="devsite-header-icon-button button-flat material-icons gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Navigation menu button" visually-hidden aria-label="Open menu"> </button> <div class="devsite-product-name-wrapper"> <a href="https://developers.google.com/privacy-sandbox"> <div class="devsite-product-logo-container" size="medium" > <picture> <img class="devsite-product-logo" alt="Privacy Sandbox" src="https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo.png" srcset="https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_36.png 36w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_48.png 48w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_72.png 72w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_96.png 96w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_480.png 480w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_720.png 720w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_856.png 856w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_960.png 960w, 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aria-label="Upper tabs"> <tab class="devsite-active"> <a href="https://developers.google.com/privacy-sandbox" track-metadata-eventdetail="https://developers.google.com/privacy-sandbox" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - overview" track-metadata-module="primary nav" aria-label="Overview, selected" data-category="Site-Wide Custom Events" data-label="Tab: Overview" track-name="overview" > Overview </a> </tab> <tab > <a href="https://developers.google.com/privacy-sandbox/cookies" track-metadata-eventdetail="https://developers.google.com/privacy-sandbox/cookies" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - cookies" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Cookies" track-name="cookies" > Cookies </a> </tab> <tab > <a href="https://developers.google.com/privacy-sandbox/private-advertising" track-metadata-eventdetail="https://developers.google.com/privacy-sandbox/private-advertising" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - private advertising" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Private advertising" track-name="private advertising" > Private advertising </a> </tab> <tab > <a href="https://developers.google.com/privacy-sandbox/protections" track-metadata-eventdetail="https://developers.google.com/privacy-sandbox/protections" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - privacy protections" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Privacy protections" track-name="privacy protections" > Privacy protections </a> </tab> <tab > <a href="https://developers.google.com/privacy-sandbox/learn" track-metadata-eventdetail="https://developers.google.com/privacy-sandbox/learn" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - learn" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Learn" track-name="learn" > Learn </a> </tab> <tab > <a href="https://developers.google.com/privacy-sandbox/blog" track-metadata-eventdetail="https://developers.google.com/privacy-sandbox/blog" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - blog" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Blog" track-name="blog" > Blog </a> </tab> </nav> </devsite-tabs> </div> <devsite-search enable-signin enable-search enable-suggestions enable-query-completion project-name="Privacy Sandbox" tenant-name="Google for Developers" project-scope="/privacy-sandbox" url-scoped="https://developers.google.com/s/results/privacy-sandbox" > <form class="devsite-search-form" action="https://developers.google.com/s/results" method="GET"> <div class="devsite-search-container"> <button type="button" search-open class="devsite-search-button devsite-header-icon-button button-flat material-icons" aria-label="Open search"></button> <div class="devsite-searchbox"> <input aria-activedescendant="" aria-autocomplete="list" aria-label="Search" aria-expanded="false" aria-haspopup="listbox" autocomplete="off" class="devsite-search-field devsite-search-query" name="q" placeholder="Search" role="combobox" type="text" value="" > <div class="devsite-search-image material-icons" aria-hidden="true"> </div> <div class="devsite-search-shortcut-icon-container" aria-hidden="true"> <kbd class="devsite-search-shortcut-icon">/</kbd> </div> </div> </div> </form> <button type="button" search-close class="devsite-search-button devsite-header-icon-button button-flat material-icons" aria-label="Close search"></button> </devsite-search> </div> <devsite-language-selector> <ul role="presentation"> <li role="presentation"> <a role="menuitem" lang="en" >English</a> </li> <li role="presentation"> <a role="menuitem" lang="de" >Deutsch</a> </li> <li role="presentation"> <a role="menuitem" lang="es" >Español</a> </li> <li role="presentation"> <a role="menuitem" lang="es_419" >Español – América Latina</a> </li> <li role="presentation"> <a role="menuitem" lang="fr" >Français</a> </li> <li role="presentation"> <a role="menuitem" lang="id" >Indonesia</a> </li> <li role="presentation"> <a role="menuitem" lang="it" >Italiano</a> </li> <li role="presentation"> <a role="menuitem" lang="pl" >Polski</a> </li> <li role="presentation"> <a role="menuitem" lang="pt_br" >Português – Brasil</a> </li> <li role="presentation"> <a role="menuitem" lang="vi" >Tiếng Việt</a> </li> <li role="presentation"> <a role="menuitem" lang="tr" >Türkçe</a> </li> <li role="presentation"> <a role="menuitem" lang="ru" >Русский</a> </li> <li role="presentation"> <a role="menuitem" lang="he" >עברית</a> </li> <li role="presentation"> <a role="menuitem" lang="ar" >العربيّة</a> </li> <li role="presentation"> <a role="menuitem" lang="fa" >فارسی</a> </li> <li role="presentation"> <a role="menuitem" lang="hi" >हिंदी</a> </li> <li role="presentation"> <a role="menuitem" lang="bn" >বাংলা</a> </li> <li role="presentation"> <a role="menuitem" lang="th" >ภาษาไทย</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_cn" >中文 – 简体</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_tw" >中文 – 繁體</a> </li> <li role="presentation"> <a role="menuitem" lang="ja" >日本語</a> </li> <li role="presentation"> <a role="menuitem" lang="ko" >한국어</a> </li> </ul> </devsite-language-selector> <a class="devsite-header-link devsite-top-button button gc-analytics-event" href="//privacysandbox.com/" data-category="Site-Wide Custom Events" data-label="Site header link" > Home </a> <devsite-user enable-profiles fp-auth id="devsite-user"> <span class="button devsite-top-button" aria-hidden="true" visually-hidden>Sign in</span> </devsite-user> </div> </div> </div> <div class="devsite-collapsible-section devsite-header-no-lower-tabs "> <div class="devsite-header-background"> <div class="devsite-product-id-row" > <div class="devsite-product-description-row"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item "> <a href="https://developers.google.com/privacy-sandbox" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Lower Header" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="" > Overview </a> </li> </ul> </div> </div> </div> </div> </div> </devsite-header> <devsite-book-nav scrollbars > <div class="devsite-book-nav-filter" > <span class="filter-list-icon material-icons" aria-hidden="true"></span> <input type="text" placeholder="Filter" aria-label="Type to filter" role="searchbox"> <span class="filter-clear-button hidden" data-title="Clear filter" aria-label="Clear filter" role="button" tabindex="0"></span> </div> <nav class="devsite-book-nav devsite-nav nocontent" aria-label="Side menu"> <div class="devsite-mobile-header"> <button type="button" id="devsite-close-nav" class="devsite-header-icon-button button-flat material-icons gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Close navigation" aria-label="Close navigation"> </button> <div class="devsite-product-name-wrapper"> <a href="https://developers.google.com/privacy-sandbox"> <div class="devsite-product-logo-container" size="medium" > <picture> <img class="devsite-product-logo" alt="Privacy Sandbox" src="https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo.png" srcset="https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_36.png 36w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_48.png 48w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_72.png 72w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_96.png 96w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_480.png 480w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_720.png 720w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_856.png 856w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_960.png 960w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_1440.png 1440w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_1920.png 1920w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_2880.png 2880w" sizes="64px" loading="lazy" > </picture> </div> </a> <span class="devsite-product-name"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item "> <a href="https://developers.google.com/privacy-sandbox" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Upper Header" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="Privacy Sandbox" > Privacy Sandbox </a> </li> </ul> </span> </div> </div> <div class="devsite-book-nav-wrapper"> <div class="devsite-mobile-nav-top"> <ul class="devsite-nav-list"> <li class="devsite-nav-item"> <a href="/privacy-sandbox" class="devsite-nav-title gc-analytics-event devsite-nav-has-children devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: Overview" track-name="overview" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Overview" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Overview </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/privacy-sandbox/cookies" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Cookies" track-name="cookies" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Cookies" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Cookies </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/privacy-sandbox/private-advertising" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Private advertising" track-name="private advertising" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Private advertising" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Private advertising </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/privacy-sandbox/protections" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Privacy protections" track-name="privacy protections" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Privacy protections" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Privacy protections </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/privacy-sandbox/learn" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Learn" track-name="learn" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Learn" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Learn </span> </a> </li> <li class="devsite-nav-item"> <a href="/privacy-sandbox/blog" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Blog" track-name="blog" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Blog" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Blog </span> </a> </li> <li class="devsite-nav-item"> <a href="//privacysandbox.com/" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Home" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Home </span> </a> </li> </ul> </div> <div class="devsite-mobile-nav-bottom"> <ul class="devsite-nav-list" menu="_book"> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>About Privacy Sandbox</span> </div></li> <li class="devsite-nav-item"><a href="/privacy-sandbox" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox" ><span class="devsite-nav-text" tooltip>What is the Privacy Sandbox</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/overview/web" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/overview/web" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/overview/web" ><span class="devsite-nav-text" tooltip>Web</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/overview/android" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/overview/android" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/overview/android" ><span class="devsite-nav-text" tooltip>Android</span></a></li> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>Status and progress updates</span> </div></li> <li class="devsite-nav-item"><a href="https://privacysandbox.com/open-web/#the-privacy-sandbox-timeline" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: https://privacysandbox.com/open-web/#the-privacy-sandbox-timeline" track-type="bookNav" track-name="click" track-metadata-eventdetail="https://privacysandbox.com/open-web/#the-privacy-sandbox-timeline" ><span class="devsite-nav-text" tooltip>Timeline</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/overview/status" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/overview/status" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/overview/status" ><span class="devsite-nav-text" tooltip>Web API status and feature releases</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/overview/android-progress-updates" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: 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class="devsite-banner devsite-banner-announcement nocontent" > <div class="devsite-banner-message"> <div class="devsite-banner-message-text"> Chrome is proposing a new experience for user choice with third-party cookies. Content on this page will be updated to reflect the changes. Find out more from privacysandbox.com. </div> </div> </div> <div class="devsite-article-meta nocontent" role="navigation"> <ul class="devsite-breadcrumb-list" aria-label="Breadcrumb"> <li class="devsite-breadcrumb-item "> <a href="https://developers.google.com/" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="" > Home </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://developers.google.com/privacy-sandbox" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="2" track-type="globalNav" track-name="breadcrumb" track-metadata-position="2" track-metadata-eventdetail="Privacy Sandbox" > Privacy Sandbox </a> </li> </ul> <devsite-thumb-rating position="header"> </devsite-thumb-rating> </div> <devsite-feedback position="header" project-name="Privacy Sandbox" product-id="5335444" bucket="" context="" version="t-devsite-webserver-20241114-r00-rc02.464922260396498922" data-label="Send Feedback Button" track-type="feedback" track-name="sendFeedbackLink" track-metadata-position="header" class="nocontent" disable-product-feedback project-icon="https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo.png" > <button> Send feedback </button> </devsite-feedback> <h1 class="devsite-page-title" tabindex="-1"> What is the Privacy Sandbox? </h1> <devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip> <div class="devsite-page-title-meta"><devsite-view-release-notes></devsite-view-release-notes></div> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded > </devsite-toc> <div class="devsite-article-body clearfix "> <p>The Privacy Sandbox initiative aims to create technologies that both protect people's privacy online and give companies and developers tools to build thriving digital businesses.</p> <p>The Privacy Sandbox has two core aims:</p> <ul> <li>Provide alternative solutions for browsing without third-party cookies.</li> <li>Reduce cross-site and cross-app tracking while helping to keep online content and services free for all.</li> </ul> <div class="video-wrapper"> <devsite-video video-id="WnCKlNE52tc"> </devsite-video> </div> <p>The Privacy Sandbox APIs require web browsers to take on a new role. Rather than working with limited tools and protections, the APIs allow a user's browser to act on the user's behalf—locally, on their device—to protect the user's identifying information as they navigate the web. This is a shift in direction for browsers.</p> <p>The Privacy Sandbox's vision of the future has browsers providing specific tools to satisfy specific use cases, while preserving user privacy.</p> <h2 id="what_are_the_privacy_sandbox_proposals" data-text="What are the Privacy Sandbox proposals?" tabindex="-1">What are the Privacy Sandbox proposals?</h2> <p>Chrome and other ecosystem stakeholders have offered more than 30 proposals to date, which can be found in the <a href="https://github.com/w3c/web-advertising#ideas-and-proposals-links-outside-this-repo">public resources of W3C groups</a>. These proposals cover a wide variety of use cases and requirements.</p> <p>Proposals have a lifecycle with up to three phases before becoming <a href="https://www.w3.org/standards/">web standards</a>: discussion, testing, and scaled adoption. It's critical that we <a href="/privacy-sandbox/setup/web/feedback">receive feedback</a> from developers and industry leaders to ensure we create durable web features with broad utility and robust privacy protections for users. Read more about the <a href="/privacy-sandbox/overview/proposal-lifecycle">proposal lifecycle</a>.</p> <p>Several key proposals are listed below.</p> <h3 id="strengthen_cross-site_privacy_boundaries" data-text="Strengthen cross-site privacy boundaries" tabindex="-1">Strengthen cross-site privacy boundaries</h3> <ul> <li><a href="/privacy-sandbox/cookies/chips"><strong>CHIPS</strong></a>: Allow developers to opt-in a cookie to partitioned storage, with a separate cookie jar per top-level site.</li> <li><a href="/privacy-sandbox/cookies/related-website-sets"><strong>Related Website Sets</strong></a>: Allow related domain names owned by the same entity to declare themselves as belonging to the same first party.</li> <li><a href="/privacy-sandbox/relevance/shared-storage"><strong>Shared Storage</strong></a>: Create a general-purpose API which allows sites to store and access unpartitioned cross-site data. This data must be read in a secure environment to prevent leakage.</li> <li><a href="/privacy-sandbox/cookies/storage-partitioning"><strong>Storage Partitioning</strong></a>: Enable all forms of <a href="https://github.com/privacycg/storage-partitioning#user-agent-state">user agent state</a>, such as <code translate="no" dir="ltr">localStorage</code> or cookies, to be double-keyed: by the top-level site as well as the origin of the resource being loaded, rather than a single origin or site.</li> <li><a href="/privacy-sandbox/relevance/fenced-frame"><strong>Fenced Frames</strong></a>: Securely embed content onto a page without sharing cross-site data.</li> <li><a href="https://github.com/MattMenke2/Explainer---Partition-Network-State"><strong>Network State Partitioning</strong></a>: Prevent browser network resources being shared across first-party contexts, by ensuring that every request has a network partition key that must match in order for resources to be reused.</li> <li><a href="/privacy-sandbox/cookies/fedcm"><strong>Federated Credential Management (FedCM)</strong></a>: Support federated identity without sharing the user's email address or other identifying information with a third-party service or website, unless the user explicitly agrees to do so.</li> </ul> <h3 id="show_relevant_content_and_ads" data-text="Show relevant content and ads" tabindex="-1">Show relevant content and ads</h3> <ul> <li><a href="/privacy-sandbox/relevance/topics"><strong>Topics API</strong></a>: Enable interest-based advertising without use of third-party cookies or tracking user behavior across sites.</li> <li><a href="/privacy-sandbox/relevance/protected-audience"><strong>Protected Audience API</strong></a>: Ad selection to serve remarketing and custom audience use cases, designed so that it cannot be used by third parties to track user browsing behavior across sites. The Protected Audience API is the first experiment to be implemented in Chromium from the <a href="https://github.com/WICG/turtledove">TURTLEDOVE</a> family of proposals.</li> </ul> <h3 id="measure_digital_ads" data-text="Measure digital ads" tabindex="-1">Measure digital ads</h3> <ul> <li><a href="/privacy-sandbox/relevance/attribution-reporting"><strong>Attribution Reporting</strong></a>: Correlate ad clicks or ad views with conversions. Ad techs can generate event-level or <a href="/privacy-sandbox/relevance/attribution-reporting/summary-reports">summary reports</a>.</li> <li><a href="/privacy-sandbox/relevance/private-aggregation"><strong>Private Aggregation API</strong></a>: Generate noisy summary reports with cross-site data.</li> </ul> <h3 id="prevent_covert_tracking" data-text="Prevent covert tracking" tabindex="-1">Prevent covert tracking</h3> <ul> <li><a href="/privacy-sandbox/protections/user-agent"><strong>User-Agent reduction and User-Agent Client Hints</strong></a>: Limit passively shared browser data to reduce the volume of sensitive information which leads to fingerprinting. Client Hints allow developers to actively request only the information they need about the user's device or conditions.</li> <li><a href="/privacy-sandbox/protections/ip-protection"><strong>IP Protection</strong></a>: Improve user privacy by protecting their IP address from being used for tracking.</li> <li><a href="/privacy-sandbox/protections/bounce-tracking-mitigations"><strong>Bounce tracking mitigations</strong></a>: A proposal to reduce or eliminate the ability of bounce tracking to recognize people across contexts.</li> <li><a href="/privacy-sandbox/protections/privacy-budget"><strong>Privacy Budget</strong></a>: Limit the amount of individual user data exposed to sites to prevent covert tracking.</li> </ul> <h3 id="fight_spam_and_fraud_on_the_web" data-text="Fight spam and fraud on the web" tabindex="-1">Fight spam and fraud on the web</h3> <ul> <li><a href="/privacy-sandbox/protections/private-state-tokens"><strong>Private State Tokens</strong></a>: Allow websites to convey a limited amount of information from one browsing context to another (for example, across sites) to help combat fraud, without passive tracking.</li> </ul> <h2 id="engage_and_share_feedback" data-text="Engage and share feedback" tabindex="-1">Engage and share feedback</h2> <ul> <li><strong>GitHub</strong>: read the explainers on GitHub and raise questions or comments in the Issues tab for each.</li> <li><strong>W3C</strong>: Use cases can be discussed and industry feedback shared in the W3C <a href="https://www.w3.org/community/web-adv/">Improving Web Advertising Business Group</a>, the <a href="https://www.w3.org/community/privacycg/participants">Privacy Community Group</a>, and the <a href="https://github.com/WICG">Web Incubator Community Group</a>.</li> <li><strong>Developer support</strong>: Ask questions and join discussions on the <a href="https://github.com/GoogleChromeLabs/privacy-sandbox-dev-support">Privacy Sandbox Developer Support repo</a>.</li> </ul> <h2 id="find_out_more" data-text="Find out more" tabindex="-1">Find out more</h2> <ul> <li><a href="https://web.dev/digging-into-the-privacy-sandbox">Digging into the Privacy Sandbox</a></li> <li><a href="https://github.com/michaelkleber/privacy-model">A Potential Privacy Model for the Web</a> sets out the core principles underlying the APIs.</li> <li>Chromium's overview of <a href="https://www.chromium.org/Home/chromium-privacy/privacy-sandbox">the Privacy Sandbox</a></li> <li>Google AI Blog: <a href="https://ai.googleblog.com/2017/04/federated-learning-collaborative.html">Federated Learning: Collaborative Machine Learning without Centralized Training Data</a></li> <li><a href="https://blog.chromium.org/2019/10/developers-get-ready-for-new.html">The future of third-party cookies</a></li> </ul> <h3 id="stay_up_to_date_on_the_progress_of_the_privacy_sandbox" data-text="Stay up to date on the progress of the Privacy Sandbox" tabindex="-1">Stay up to date on the progress of the Privacy Sandbox</h3> <p>You can 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involved</h3> <ul> <li>Participate in incubation, testing and refinement of the APIs: <a href="/privacy-sandbox/blog/privacy-sandbox-participate">How to participate in the Privacy Sandbox initiative</a></li> <li>As a developer, join discussions or ask questions: <a href="https://github.com/GoogleChromeLabs/privacy-sandbox-dev-support">Privacy Sandbox Developer Support</a></li> </ul> <p>For questions about specific APIs, you can file an issue on the <a href="/privacy-sandbox/overview/status">GitHub repository for an API Explainer</a>.</p> </div> <devsite-recommendations display="in-page" hidden yield> </devsite-recommendations> <devsite-thumb-rating position="footer"> </devsite-thumb-rating> <devsite-feedback position="footer" project-name="Privacy Sandbox" product-id="5335444" bucket="" context="" version="t-devsite-webserver-20241114-r00-rc02.464922260396498922" data-label="Send Feedback Button" track-type="feedback" track-name="sendFeedbackLink" track-metadata-position="footer" 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