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href="https://developers.google.com/privacy-sandbox/blog/cookie-countdown-2024jan?hl=vi" /><title>Third-party cookies restricted by default for 1% of Chrome users | Privacy Sandbox | Google for Developers</title> <meta property="og:title" content="Third-party cookies restricted by default for 1% of Chrome users | Privacy Sandbox | Google for Developers"><meta name="description" content="If your site uses third-party cookies it&#39;s time to take action as we approach their deprecation. Third-party cookies are restricted by default for 1% of users from January 4th, 2024 to facilitate testing before we plan to ramp up to 100% of users from Q3 2024."> <meta property="og:description" content="If your site uses third-party cookies it&#39;s time to take action as we approach their deprecation. Third-party cookies are restricted by default for 1% of users from January 4th, 2024 to facilitate testing before we plan to ramp up to 100% of users from Q3 2024."><meta property="og:url" content="https://developers.google.com/privacy-sandbox/blog/cookie-countdown-2024jan"><meta property="og:image" content="https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-for-developers.png"> <meta property="og:image:width" content="1600"> <meta property="og:image:height" content="900"><meta property="og:locale" content="en"><meta name="twitter:card" content="summary_large_image"><script type="application/ld+json"> { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [{ "@type": "ListItem", "position": 1, "name": "Privacy Sandbox", "item": "https://developers.google.com/privacy-sandbox" },{ "@type": "ListItem", "position": 2, "name": "Third-party cookies restricted by default for 1% of Chrome users", "item": 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<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 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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 " 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> </nav> </devsite-book-nav> <section id="gc-wrapper"> <main role="main" id="main-content" class="devsite-main-content" has-sidebar > <div class="devsite-sidebar"> <div class="devsite-sidebar-content"> <devsite-toc class="devsite-nav" role="navigation" aria-label="On this page" depth="2" scrollbars ></devsite-toc> <devsite-recommendations-sidebar class="nocontent 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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-20250211-r00-rc00.466928320959134316" 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"> Third-party cookies restricted by default for 1% of Chrome users </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 "> <aside class="warning"><strong>Warning:</strong><span> This blog post was published in January 2024. <br><br> Chrome is proposing a <a href="https://privacysandbox.com/news/privacy-sandbox-update/">new experience for user choice</a> with third-party cookies.</span></aside> <p>As <a href="/privacy-sandbox/setup/web/chrome-facilitated-testing#mode_b_disable_1_of_third-party_cookies">per previously announced plans</a>, Chrome is restricting third-party cookies by default for 1% of Chrome users to facilitate testing, and then ramping up to 100% of users from Q3 2024. The ramp up to 100% of users is subject to addressing any remaining competition concerns of the <a href="https://www.gov.uk/cma-cases/investigation-into-googles-privacy-sandbox-browser-changes">UK's Competition and Markets Authority (CMA)</a>.</p> <p><strong>As of 4th January 2024, Chrome has started restricting third-party cookies by default for 1% of Chrome browsers. It may take several days to reach the full 1%.</strong></p> <aside class="keypoint"> <strong>Chrome browser</strong> in this context refers to a Chrome installation on a device: a Chrome client. Each individual user <a href="https://chromium.googlesource.com/chromium/src/+/HEAD/docs/user_data_dir.md">data directory</a> constitutes a distinct client. </aside> <p>Browsers that are part of the 1% group will also see new Tracking Protection user controls. You can try out these changes in Chrome 121 or higher by enabling <code translate="no" dir="ltr">chrome://flags/#test-third-party-cookie-phaseout</code>.</p> <p>We'll keep you posted as we move further along the deprecation timeline. Refer to our updated landing page on <a href="/privacy-sandbox/cookies">preparing for the end of third-party cookies</a> for immediate actions you can take to ensure your sites don't break.</p> <h2 id="identify_third-party_cookie_restrictions" data-text="Identify third-party cookie restrictions" tabindex="-1">Identify third-party cookie restrictions</h2> <p>The address bar for Chrome browsers that restrict third-party cookies will show an "eye" icon on a site that attempts to access third-party cookies:</p> <figure> <img src="/static/privacy-sandbox/assets/images/blog/omnibar-eye.png" alt="Crossed out eye icon shown in the Chrome address bar." width="600" height="99"> <figcaption>Sites attempting to use third-party cookies will have an "eye" icon shown in the Chrome address bar</figcaption> </figure> <aside class="keypoint"> <strong>Note:</strong> You'll <em>only</em> see the eye icon on sites that access third-party cookies. </aside> <p>Click the eye icon to see information about Tracking Protection, a new Chrome feature that limits cross-site tracking by restricting website access to third-party cookies by default:</p> <figure> <img src="/static/privacy-sandbox/assets/images/blog/tracking-protection-dialog.png" alt="Tracking Protection dialog shown when clicking on the eye icon in the address bar." width="600" height="436"> <figcaption>Clicking on the "eye" icon will show more information in the Tracking Protection dialog</figcaption> </figure> <p>Click the toggle to temporarily allow third-party cookies for the current site:</p> <figure> <img src="/static/privacy-sandbox/assets/images/blog/tracking-protection-dialog-allow.png" alt="Tracking protection dialog with the Third-party Cookies toggle set to Allowed and a notice that this will be allowed for 90 days." width="600" height="440"> <figcaption>The Tracking Protection dialog can be used to temporarily allow third-party cookies</figcaption> </figure> <h2 id="chrome_devtools_alerts" data-text="Chrome DevTools alerts" tabindex="-1">Chrome DevTools alerts</h2> <p>For browsers not in the 1% group, and without third-party cookies blocked from <code translate="no" dir="ltr">chrome://settings/cookies</code>, Chrome DevTools displays <strong>warnings</strong> about cross-site cookie issues:</p> <figure> <img src="/static/privacy-sandbox/assets/images/blog/devtools-thirdparty-cookies-warning.png" alt="Chrome DevTools Issues panel warning about 2 third-party cookies that will be blocked in future versions of Chrome." width="800" height="524"> <figcaption>Prior to third-party cookies being restricted warnings are shown in Chrome DevTools Issues panel</figcaption> </figure> <p>For browsers in the 1% group, DevTools displays <strong>errors</strong> about reading and setting third-party cookies being blocked:</p> <figure> <img src="/static/privacy-sandbox/assets/images/blog/devtools-thirdparty-cookies-blocked.png" alt="Chrome DevTools Issues panel warning about 5 third-party cookies that have been blocked for 1 request." width="800" height="569"> <figcaption>Errors are shown in the Chrome DevTools Issues panel after third-party cookies are restricted.</figcaption> </figure> <h2 id="settings_changes" data-text="Settings changes" tabindex="-1">Settings changes</h2> <p>For browsers in the 1% group, users will get a new <code translate="no" dir="ltr">chrome://settings/trackingProtection</code> page instead of <code translate="no" dir="ltr">chrome://settings/cookies</code>:</p> <figure> <img src="/static/privacy-sandbox/assets/images/blog/tracking-protection-settings.png" alt="Tracking Protection settings panel." width="800" height="720"> <figcaption>The Chrome Tracking Protection settings panel</figcaption> </figure> <h2 id="get_support_and_report_issues_with_third-party_cookies" data-text="Get support, and report issues with third-party cookies" tabindex="-1">Get support, and report issues with third-party cookies</h2> <p>We want to learn about scenarios where sites break when third-party cookies are restricted, to ensure that we provide adequate guidance, tooling, and capabilities to allow sites to migrate away from their third-party cookie dependencies.</p> <p>If your site or a service you depend on is breaking with third-party cookies disabled, you should report this on our breakage tracker at <a href="https://goo.gle/report-3pc-broken">goo.gle/report-3pc-broken</a>. It is also possible to <a href="/privacy-sandbox/cookies/temporary-exceptions/third-party-deprecation-trial">request additional migration time with the third-party cookie deprecation trial</a> for non-advertising use cases which would exclude your embedded site or service from the 1% test.</p> <p>If you have questions around the deprecation process, you can <a href="https://github.com/GoogleChromeLabs/privacy-sandbox-dev-support/issues/new/choose">raise a new issue using the "third-party cookie deprecation" tag</a> on our developer support repository.</p> </div> <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-20250211-r00-rc00.466928320959134316" 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> <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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