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Audit your use of cookies | Privacy Sandbox | Google for Developers
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<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, 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track-type="nav" track-metadata-position="nav - overview" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Overview" track-name="overview" > Overview </a> </tab> <tab class="devsite-active"> <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" aria-label="Cookies, selected" 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/cookies" 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="" > Cookies </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 " 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 devsite-nav-active" 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"><a href="/privacy-sandbox/cookies" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies" ><span class="devsite-nav-text" tooltip>About third-party cookies</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>Prepare for changes</span> </div></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/prepare/overview" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/prepare/overview" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/prepare/overview" ><span class="devsite-nav-text" tooltip>Overview</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/prepare/audit-cookies" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/prepare/audit-cookies" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/prepare/audit-cookies" ><span class="devsite-nav-text" tooltip>Audit cookies</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/prepare/test-for-breakage" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/prepare/test-for-breakage" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/prepare/test-for-breakage" ><span class="devsite-nav-text" tooltip>Test for breakage</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/prepare/debug" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/prepare/debug" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/prepare/debug" ><span class="devsite-nav-text" tooltip>Debug third-party cookie blocking</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>Solutions</span> </div></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/chips" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/chips" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/chips" ><span class="devsite-nav-text" tooltip>CHIPS</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/chips-transition" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/chips-transition" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/chips-transition" ><span class="devsite-nav-text" tooltip>Transition to partitioned cookies</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/storage-access-api" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/storage-access-api" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/storage-access-api" ><span class="devsite-nav-text" tooltip>Storage Access API</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/related-website-sets" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/related-website-sets" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/related-website-sets" ><span class="devsite-nav-text" tooltip>Related Website Sets</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/related-website-sets-integration" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/related-website-sets-integration" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/related-website-sets-integration" ><span class="devsite-nav-text" tooltip>Related Website Sets Developer guide</span></a></li> <li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Federated Credential Management API</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/fedcm" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/fedcm" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/fedcm" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/fedcm-developer-guide" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/fedcm-developer-guide" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/fedcm-developer-guide" ><span class="devsite-nav-text" tooltip>Developer guide</span></a></li><li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/fedcm-updates" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/fedcm-updates" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/fedcm-updates" ><span class="devsite-nav-text" tooltip>Updates</span></a></li><li class="devsite-nav-item"><a href="/privacy-sandbox/learn?api=federatedcredentialmanagement" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/learn?api=federatedcredentialmanagement" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/learn?api=federatedcredentialmanagement" ><span class="devsite-nav-text" tooltip>Tagged docs and blog posts</span></a></li></ul></div></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/storage-partitioning" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/storage-partitioning" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/storage-partitioning" ><span class="devsite-nav-text" tooltip>Storage partitioning</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>Guides</span> </div></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/guides" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/guides" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/guides" ><span class="devsite-nav-text" tooltip>Overview</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/guides/identity" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/guides/identity" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/guides/identity" ><span class="devsite-nav-text" tooltip>Identity</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/guides/embeds" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/guides/embeds" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/guides/embeds" ><span class="devsite-nav-text" tooltip>Embeds</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/resources/case-studies/times-internet" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/resources/case-studies/times-internet" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/resources/case-studies/times-internet" ><span class="devsite-nav-text" tooltip>Case study: Times Internet</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/resources/case-studies/mercado-libre" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/resources/case-studies/mercado-libre" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/resources/case-studies/mercado-libre" ><span class="devsite-nav-text" tooltip>Case study: Mercado Libre</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>Temporary exceptions</span> </div></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/temporary-exceptions/preserving-critical-user-experiences" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/temporary-exceptions/preserving-critical-user-experiences" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/temporary-exceptions/preserving-critical-user-experiences" ><span class="devsite-nav-text" tooltip>Overview</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/temporary-exceptions/grace-period" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/temporary-exceptions/grace-period" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/temporary-exceptions/grace-period" ><span class="devsite-nav-text" tooltip>Grace period</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/temporary-exceptions/grace-period-opt-out" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/temporary-exceptions/grace-period-opt-out" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/temporary-exceptions/grace-period-opt-out" ><span class="devsite-nav-text" tooltip>Grace period opt out</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/dashboard" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/dashboard" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/dashboard" ><span class="devsite-nav-text" tooltip>Compatibility lookup tool</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/temporary-exceptions/storage-partitioning-deprecation-trial" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/temporary-exceptions/storage-partitioning-deprecation-trial" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/temporary-exceptions/storage-partitioning-deprecation-trial" ><span class="devsite-nav-text" tooltip>Storage Partitioning deprecation trial</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/temporary-exceptions/heuristics-based-exceptions" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/temporary-exceptions/heuristics-based-exceptions" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/temporary-exceptions/heuristics-based-exceptions" ><span class="devsite-nav-text" tooltip>Heuristics based exceptions</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/temporary-exceptions/chrome-enterprise" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/temporary-exceptions/chrome-enterprise" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/temporary-exceptions/chrome-enterprise" ><span class="devsite-nav-text" tooltip>Chrome Enterprise policies</span></a></li> </ul> </div> </div> </nav> </devsite-book-nav> <section id="gc-wrapper"> <main role="main" class="devsite-main-content" has-book-nav > <devsite-content> <article class="devsite-article"> <div 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> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://developers.google.com/privacy-sandbox/cookies" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="3" track-type="globalNav" track-name="breadcrumb" track-metadata-position="3" track-metadata-eventdetail="" > Cookies </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"> Audit your use of cookies </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><devsite-video video-id="rlzBrtbvMk4"></devsite-video></p> <p><br><br></p> <p>Check if third-party cookies are being used on your website or by third-party services that your site relies on.</p> <h2 id="understand" data-text="Understand third-party cookie usage" tabindex="-1">Understand third-party cookie usage</h2> <p>Cookies sent in <a href="https://web.dev/articles/same-site-same-origin#same-site-cross-site">cross-site</a> contexts such as iframes or subresource requests, are generally referred to as third-party cookies—even when they're not from a third party. Third-party cookies can be from a third party such as an analytics service or ad tech, but they can also be from a site or service of your own that has a domain that's different from the top-level page, such as an image server or a microsite.</p> <p><a href="https://web.dev/articles/samesite-cookie-recipes#use_cases_for_cross_site_or_third_party_cookies">Use cases for third-party cookies</a> include:</p> <ul> <li>Embedded content shared from other sites, such as videos, maps, code samples, and social posts.</li> <li>Widgets for external services such as payments, calendars, booking, and reservation.</li> <li>Widgets such as social buttons or anti-fraud services.</li> <li>Remote <code translate="no" dir="ltr"><img></code> or <code translate="no" dir="ltr"><script></code> resources that rely on cookies to be sent with a request (commonly used for tracking pixels and personalizing content).</li> </ul> <figure> <img src="/static/privacy-sandbox/assets/images/diagram-showing-third-pa-36617586d75bc.png" alt="Diagram showing a third-party cookie." width="400" height="323"> <figcaption>Example of a third-party cookie.</figcaption> </figure> <p>In 2019, browsers changed cookie behavior, <a href="https://web.dev/articles/samesite-cookies-explained#changes_to_the_default_behavior_without_samesite">restricting cookies to first-party access by default</a>. Any cookies used in cross-site contexts today must be set with <code translate="no" dir="ltr">SameSite=None</code> attribute.</p> <div></div><devsite-code><pre class="devsite-click-to-copy" translate="no" dir="ltr" is-upgraded syntax="Text only"><code translate="no" dir="ltr">Set-Cookie: cookie-name=value; SameSite=None; Secure </code></pre></devsite-code> <p>This means that third-party cookies can be identified by their <code translate="no" dir="ltr">SameSite=None</code> attribute.</p> <h2 id="audit" data-text="Audit your third-party cookie usage" tabindex="-1">Audit your third-party cookie usage</h2> <p>You should search your code for instances where you set the <code translate="no" dir="ltr">SameSite</code> cookie attribute to <code translate="no" dir="ltr">None</code>. If you previously made changes to add <code translate="no" dir="ltr">SameSite=None</code> to your cookies around 2020, then those changes may provide a good starting point.</p> <p>If you find cookies marked as <code translate="no" dir="ltr">SameSite=None</code> that don't seem to be used in a cross-site context, check if that's deliberate, as they may be used in a cross-site context elsewhere. Otherwise, <code translate="no" dir="ltr">SameSite=None</code> may have been set inadvertently and you should remove any unnecessary <code translate="no" dir="ltr">SameSite=None</code> usage.</p> <p><a href="/privacy-sandbox/cookies/chips">Partitioned cookies</a>—those set with the <code translate="no" dir="ltr">Partitioned</code> attribute—will continue to be delivered even where third-party cookies are restricted on <a href="https://developer.mozilla.org/docs/Web/Privacy/Partitioned_cookies#browser_compatibility">browsers that support this attribute</a>.</p> <aside class="key-point"> <strong>Key point</strong>: Make sure to review your cookies and have a list of those set with the <code translate="no" dir="ltr">SameSite=None</code>. These are the cookies for which you may need to take action to ensure they keep functioning properly. </aside> <h3 id="chrome-dev-tools" data-text="Chrome DevTools" tabindex="-1">Chrome DevTools</h3> <p>The Chrome DevTools Network panel shows cookies set and sent on requests. In the Application panel you can see the Cookies heading under Storage. You can browse the cookies stored for each site accessed as part of the page load. You can sort by the <code translate="no" dir="ltr">SameSite</code> column to group all the <code translate="no" dir="ltr">None</code> cookies.</p> <figure> <img src="/static/privacy-sandbox/assets/images/blog/3pc-issues.png" alt="DevTools Issues tab showing a warning for SameSite=None cookies." width="800"> <figcaption>DevTools Issues tab</figcaption> </figure> <p>From Chrome 118, the <a href="https://developer.chrome.com/docs/devtools/issues/">DevTools Issues tab</a> shows the breaking change issue, "Cookie sent in cross-site context will be blocked in future Chrome versions." The issue lists potentially affected cookies for the current page.</p> <h3 id="psat" data-text="Privacy Sandbox Analysis Tool" tabindex="-1">Privacy Sandbox Analysis Tool</h3> <p>We've also built <a href="/privacy-sandbox/blog/psat-announcement">the Privacy Sandbox Analysis Tool (PSAT)</a>, a DevTools extension to facilitate analysis of cookie usage during browsing sessions. This provides debugging pathways for cookies and Privacy Sandbox features, with access points to learn more about the Privacy Sandbox initiative.</p> <figure> <img src="/static/privacy-sandbox/assets/images/psat-example.png" alt="Privacy Sandbox Analysis Tool (PSAT) screenshot showing the number and types of cookies used in a modal and the list of cookies behind that with the reason they are blocked." width="800" height="444"> <figcaption>Privacy Sandbox Analysis Tool (PSAT)</figcaption> </figure> <p>The extension complements DevTools with specialized capabilities for analyzing and debugging scenarios related to third-party cookie usage, and the adoption of new <a href="https://privacysandbox.com/open-web/">privacy-preserving alternatives</a>.</p> <p>You can download the extension from the <a href="https://chromewebstore.google.com/detail/ehbnpceebmgpanbbfckhoefhdibijkef">Chrome Web Store</a> or access the <a href="https://github.com/GoogleChromeLabs/ps-analysis-tool">PSAT repository and wiki</a>.</p> <h3 id="check-third-party-service-providers" data-text="Check in with your third-party service providers" tabindex="-1">Check in with your third-party service providers</h3> <p>If you identify cookies set by third parties, you should check with those providers to see if they plan to move away from setting cross-site cookies. You may need to upgrade a version of a library you are using, change a configuration option in the service, or take no action if the third party is handling the necessary changes themselves.</p> <h2 id="improve" data-text="Improve your first-party cookies" tabindex="-1">Improve your first-party cookies</h2> <p>If your cookie is never used on a third-party site, for example if you set a cookie to manage the session on your site and it's never used in a cross-site iframe, then you should explicitly mark the cookie as <code translate="no" dir="ltr">SameSite=Lax</code> or <code translate="no" dir="ltr">SameSite=Strict</code>. There are a number of other sensible defaults to use for first-party cookies. For more details, check out <a href="https://web.dev/first-party-cookie-recipes">Recipes for first-party cookies</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" 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> <devsite-recommendations id="recommendations-link" yield></devsite-recommendations> <div class="devsite-floating-action-buttons"> </div> </article> <devsite-content-footer class="nocontent"> <p>Except as otherwise noted, the content of this page is licensed under the <a href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 License</a>, and code samples are licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache 2.0 License</a>. 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