{"id":4645,"date":"2022-06-22T10:25:48","date_gmt":"2022-06-22T10:25:48","guid":{"rendered":"https:\/\/wearekemb.com\/?p=4645"},"modified":"2025-03-03T18:19:40","modified_gmt":"2025-03-03T17:19:40","slug":"cross-domain-tracking-with-google-analytics-4","status":"publish","type":"post","link":"https:\/\/wearekemb.com\/en\/cross-domain-tracking-with-google-analytics-4\/","title":{"rendered":"Cross-domain tracking with Google"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; custom_padding_last_edited=&#8221;on|tablet&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#FFFFFF&#8221; custom_padding_tablet=&#8221;30px||30px||true|false&#8221; custom_padding_phone=&#8221;30px||30px||true|false&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_row _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/wearekemb.com\/en\/cross-domain-tracking-with-google-analytics-4\/#How_does_Google_Analytics_track_visitors\" >How does Google Analytics track visitors?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/wearekemb.com\/en\/cross-domain-tracking-with-google-analytics-4\/#How_does_cross_domain_tracking_work\" >How does cross domain tracking work?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/wearekemb.com\/en\/cross-domain-tracking-with-google-analytics-4\/#Distinction_between_subdomains_and_cross-domain_tracking\" >Distinction between subdomains and cross-domain tracking<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/wearekemb.com\/en\/cross-domain-tracking-with-google-analytics-4\/#How_to_configure_cross-domain_tracking\" >How to configure cross-domain tracking<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/wearekemb.com\/en\/cross-domain-tracking-with-google-analytics-4\/#Closing_notes\" >Closing notes<\/a><\/li><\/ul><\/nav><\/div>\n\n<p><span>Cross-domain tracking is an interesting topic to tackle as it might cause confusion amongst marketers and analysts as to when it is needed and how it actually works. It might get confused with sub-domain tracking as well. In this article, we explore and answer questions around this topic and shed light on some important nuances as well.<\/span><\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; text_font_size_phone=&#8221;12px&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_does_Google_Analytics_track_visitors\"><\/span><strong>How does Google Analytics track visitors?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; text_font_size_phone=&#8221;12px&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<p><span>Before explaining cross-domain tracking, you first need to understand how Google Analytics tracks visitors. When someone visits your website, GA stores a cookie on their browser called _ga (it\u2019s called a first party cookie because GA, configured on\u00a0<\/span><strong>your website<\/strong><span>, sets the cookie on your behalf). When the visitor navigates to another page on your website (landed on page A and moves to page B afterwards) the value of the cookie will be forwarded to the second page and therefore when GA will be searching for that cookie, it still sees it and sees that it has the same value. In plain English, this is how Google Analytics tracks and recognizes you as a user. However there are some nuances that you need to know as well.<\/span><\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/wearekemb.com\/wp-content\/uploads\/2023\/02\/inspect-1024&#215;373-1.png&#8221; title_text=&#8221;inspect&#8211;1024&#215;373&#8243; _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<p><span>This is a screenshot of my browser\u2019s cookie window (To see what cookies are set on your browser, open the website and then\u00a0<\/span><strong>right click \u2014 Inspect\u2014Applications(for google chrome browser).<span>\u00a0<\/span><\/strong><span>Before a user gives consent on a website, no cookie should be placed in your browser for that website (<\/span><a href=\"https:\/\/b2qjiax0.myraidbox.de\/en\/data-privacy-with-ga4\/\" target=\"_blank\" rel=\"noreferrer noopener\">Please refer to our data privacy article<\/a><span>). After giving consent many cookies will be set on your browser, including the _ga cookie. And this is what it looks like:<\/span><\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/wearekemb.com\/wp-content\/uploads\/2023\/02\/browser-ga-cookie-1024&#215;352-1.png&#8221; title_text=&#8221;browser-ga-cookie&#8211;1024&#215;352&#8243; _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<p>So what we can see here is that the<span>\u00a0<\/span><strong>_ga<span>\u00a0<\/span><\/strong>cookie has a value of<span>\u00a0<\/span><strong>GA1.1.1500170752.1655839757<span>\u00a0<\/span><\/strong>and we can also see that the domain that set the cookie is wearekemb.com (first-party cookie).\u00a0<\/p>\n<p>When you are on the<span>\u00a0<\/span><strong>same domain,<\/strong><span>\u00a0<\/span>your _ga cookie will be saved and transferred to every page you visit. However when you switch to a different domain, that cookie is not forwarded to the second domain. Say you have two websites configured,<span>\u00a0<\/span><a href=\"http:\/\/www.website1.com\/\">www.website1.com<\/a><span>\u00a0<\/span>and<span>\u00a0<\/span><a href=\"http:\/\/www.website2.com\/\">www.website2.com<\/a><span>\u00a0<\/span>and both of them belong to the same customer journey of your business (a click from the first website redirects the visitor to the second website):<\/p>\n<p>Unfortunately, the _ga cookie is not shared between two separate domains. And well, that will be a big problem when you analyze the number of users. If cross-domain tracking is not installed, the same user that visited website1, will be counted as a<span>\u00a0<\/span><strong>different user<span>\u00a0<\/span><\/strong>when they move to website2. Because domains are not \u201ctalking to each other\u201d,\u00a0 the _ga cookie set on the visitor\u2019s browser when they visit the first website will not be shared with the second. Therefore, when the<span>\u00a0<\/span><strong>same visitor<\/strong><span>\u00a0<\/span>moves to the second website, GA will start a<span>\u00a0<\/span><strong>new session<\/strong><span>\u00a0<\/span>for a<span>\u00a0<\/span><strong>new user<\/strong>, and thus counts the same user twice. You might see now why this is a problem. You will see way too many users in your reports, you\u2019ll also see more sessions recorded. Not only that, but in the acquisition reports, you will see \u201creferrals\u201d from website 1 given that the user who moved to website 2 \u201ccame from\u201d the first website. And obviously this is not what you want to see. Cross-domain tracking solves this problem.<\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; text_font_size_phone=&#8221;12px&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_does_cross_domain_tracking_work\"><\/span><strong>How does cross domain tracking work?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When you configure cross-domain tracking you are basically linking the two websites to talk and share information with\u00a0 each other. And one very important information that will be shared is the _ga cookie value. So how does this work?<\/p>\n<p>Well, when a visitor is navigating website1, and proceeds to click on the link that moves them to the second website, a special parameter is passed to the<span>\u00a0<\/span><strong>URL of website2.<\/strong>Since the two different domains are now linked together, whenever a visitor is moved from one domain to the other, the<span>\u00a0<\/span><strong>URL<span>\u00a0<\/span><\/strong>of the second website will \u201ccarry\u201d information from the first domain. Google Analytics set up on website2 will then search for that URL parameter (that includes the _ga value from website 1) and<span>\u00a0<\/span><strong>update<span>\u00a0<\/span><\/strong>the _ga cookie value to<span>\u00a0<\/span><strong>exactly<\/strong><span>\u00a0<\/span>match that of the first website. End result? The same visitor is tracked<span>\u00a0<\/span><strong>once.<\/strong><\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/wearekemb.com\/wp-content\/uploads\/2023\/02\/cross-domain-_ga-1024&#215;472-1.png&#8221; title_text=&#8221;cross-domain-_ga&#8211;1024&#215;472&#8243; _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; text_font_size_phone=&#8221;12px&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Distinction_between_subdomains_and_cross-domain_tracking\"><\/span><strong>Distinction between subdomains and cross-domain tracking<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Before we continue setting up cross-domain it is absolutely necessary to distinguish between a sub-domain and a different domain. Going back to our example, and taking<span>\u00a0<\/span><a href=\"http:\/\/www.website1.com\/\">www.website1.com<\/a><span>\u00a0<\/span>as our first website, the domain here is website1.com.\u00a0If through your journey, you have domains such as<span>\u00a0<\/span><strong>blog.website1.com<span>\u00a0<\/span><\/strong>or<span>\u00a0<\/span><strong>app.website1.com<\/strong><span>\u00a0<\/span>or any other combination that includes the domain \u201cwebsite1.com\u201d those are called<span>\u00a0<\/span><strong>subdomains.<span>\u00a0<\/span><\/strong>And<span>\u00a0<\/span><strong>you don\u2019t need to set any cross-domain tracking for them..<span>\u00a0<\/span><\/strong>Fortunately for us, Google Analytics 4 (as well as GA3) catches and tracks those subdomains<span>\u00a0<\/span><strong>automatically<\/strong>, since they all belong to the<span>\u00a0<\/span><strong>same<\/strong><span>\u00a0<\/span>domain.<\/p>\n<p>However, when you have a completely different domain like website2.com that is when you need to set up cross-domain tracking. When both websites don\u2019t share anything and are different from one another.<br \/>REMEMBER, in order for cross-domain tracking to work in GA4, both websites need to be configured<span>\u00a0<\/span><strong>using the same<span>\u00a0<\/span><\/strong>GA4 property (same measurement ID)\u00a0<\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_configure_cross-domain_tracking\"><\/span><strong>How to configure cross-domain tracking<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<p>In the older version of Google Analytics (UA or GA3) cross-domain tracking needed to be manually configured, either through the code itself, or using Google Tag manager. The new version of analytics (GA4) has really simplified this process, especially for people who don\u2019t possess the technical skills for manual implementation. Let\u2019s check out how we can do this in Google Analytics 4.<\/p>\n<p>As previously mentioned, both websites need to have THE SAME PROPERTY in GA4 or else this won\u2019t work. We head to<span>\u00a0<\/span><strong>Admin \u2014 Property \u2014 Data streams \u2014 More tagging settings \u2014 Configure your domains<\/strong><\/p>\n<figure class=\"is-layout-flex wp-block-gallery-15 wp-block-gallery has-nested-images columns-default is-cropped\"><\/figure>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/wearekemb.com\/wp-content\/uploads\/2023\/02\/more-tagging-settings-.png&#8221; title_text=&#8221;more-tagging-settings-&#8221; _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_image][et_pb_image src=&#8221;https:\/\/wearekemb.com\/wp-content\/uploads\/2023\/02\/configure-your-domains-1024&#215;429-1.png&#8221; title_text=&#8221;configure-your-domains&#8211;1024&#215;429&#8243; _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_image][et_pb_image src=&#8221;https:\/\/wearekemb.com\/wp-content\/uploads\/2023\/02\/matching-conditions-1024&#215;448-1.png&#8221; title_text=&#8221;matching-conditions&#8211;1024&#215;448&#8243; _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; text_font_size_phone=&#8221;12px&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<p><span>This is where you insert the domains that you want to cross configure, press Save and you are done!<\/span><\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.20.4&#8243; _module_preset=&#8221;default&#8221; text_font_size_phone=&#8221;12px&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Closing_notes\"><\/span>Closing notes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<article id=\"post-5182\" class=\"post-5182 post type-post status-publish format-standard has-post-thumbnail hentry category-data-reporting tag-google-analytics-4-2\">\n<div class=\"entry-content\">\n<p>We have just explored what is cross-domain tracking, how to configure it, and when to use it. This is an important topic in the<span>\u00a0<\/span><strong><a href=\"https:\/\/b2qjiax0.myraidbox.de\/en\/how-to-migrate-to-google-analytics-4-and-why-you-should-do-it-now\/\" target=\"_blank\" rel=\"noopener\">Google Analytics 4<\/a><\/strong><span>\u00a0<\/span>sphere as it still causes some confusion or sometimes faulty setups. If you are facing a problem with cross-domain tracking, or any issue related to your web tracking, or data infrastructure setup,<span>\u00a0<\/span><strong><a href=\"https:\/\/b2qjiax0.myraidbox.de\/en\/contact-us\/\" target=\"_blank\" rel=\"noopener\">don\u2019t worry we got you covered!<\/a><\/strong><\/p>\n<\/div>\n<footer class=\"entry-footer\"><a class=\"post-edit-link\" href=\"https:\/\/b2qjiax0.myraidbox.de\/wp-admin\/post.php?post=5182&amp;action=edit&amp;lang=en\"><\/a><\/footer>\n<\/article>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.19.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This blog explores cross domain tracking in GA4. We go through how GA tracks visitors and explain when and how to set up cross-domain tracking<\/p>\n","protected":false},"author":7,"featured_media":7749,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"1728","content-type":"","inline_featured_image":false,"footnotes":""},"categories":[24,26],"tags":[31],"class_list":["post-4645","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-business-intelligence-en","category-data-reporting-en","tag-google-analytics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cross-domain tracking with Google - kemb GmbH - Your Partners in Business Intelligence, Marketing Digital Transformation<\/title>\n<meta name=\"description\" content=\"This blog explores cross domain tracking in GA4. 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