{"id":7325,"date":"2026-07-23T09:00:00","date_gmt":"2026-07-23T07:00:00","guid":{"rendered":"https:\/\/taismo.de\/unkategorisiert\/mobile-first-indexing-2\/"},"modified":"2026-07-26T18:05:41","modified_gmt":"2026-07-26T16:05:41","slug":"mobile-first-indexing","status":"publish","type":"post","link":"https:\/\/taismo.de\/en\/what-is\/mobile-first-indexing\/","title":{"rendered":"mobile-first indexing"},"content":{"rendered":"<style>\n.taismo-art{display:grid;grid-template-columns:320px minmax(0,1fr);gap:36px;align-items:start}\n.taismo-art .toc-sticky{position:sticky;top:80px}\n.taismo-art .toc-sticky ol li{margin-bottom:9px}\n.taismo-art .toc-sticky ol a:hover{color:var(--toc-hover) !important}\n.taismo-art .taismo-main h2{scroll-margin-top:90px;margin-top:38px}\n.taismo-art .lead-def{font-size:1.15em;line-height:1.6;background:#f7f2ec;border-left:4px solid #ED8924;padding:16px 20px;border-radius:8px}\n.taismo-art table{border-collapse:collapse;width:100%;margin:18px 0}\n.taismo-art 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<\/g> <\/svg><\/div>\n<h3 style=\"text-align:center;color:#fff;margin:0 0 14px;font-size:1.1em\">Contents<\/h3>\n<ol style=\"margin:0;padding-left:1.2em;line-height:1.5;font-weight:600;color:#fff;font-size:0.9em\">\n<li><a href=\"#term-at-a-glance\" style=\"color:#fff;text-decoration:none\">The term at a glance<\/a><\/li>\n<li><a href=\"#since-when-and-current-status\" style=\"color:#fff;text-decoration:none\">Since when has mobile-first indexing existed and where do things stand?<\/a><\/li>\n<li><a href=\"#what-it-means-for-your-website\" style=\"color:#fff;text-decoration:none\">What does mobile-first indexing mean for your website?<\/a><\/li>\n<li><a href=\"#most-common-problems\" style=\"color:#fff;text-decoration:none\">Which problems come up most often?<\/a><\/li>\n<li><a href=\"#how-to-become-mobile-first-ready\" style=\"color:#fff;text-decoration:none\">How do you make a site mobile-first ready?<\/a><\/li>\n<li><a href=\"#faq-mobile-first-indexing\" style=\"color:#fff;text-decoration:none\">Frequently asked questions about mobile-first indexing<\/a><\/li>\n<\/ol>\n<\/aside>\n<div class=\"taismo-main\">\n<h1 class=\"brand-claim\">What is mobile-first indexing?<\/h1>\n<p class=\"lead-def\"><strong>Mobile-first indexing<\/strong> is the procedure by which Google primarily uses the mobile version of a website for indexing and ranking. Google crawls and evaluates the content a smartphone user gets to see, not the desktop version. Whatever is missing on the phone effectively does not exist for the evaluation. According to Google, mobile-first indexing has been the standard for new websites since July 2019 and the switch was completed for the existing stock by 2023 and 2024.<\/p>\n<figure>\n      <img decoding=\"async\" src=\"https:\/\/taismo.de\/wp-content\/uploads\/2026\/07\/mobile-first-indexing.png\" alt=\"Mobile-first indexing explained: Google primarily indexes the mobile version of a website with the smartphone Googlebot\" title=\"Mobile-first indexing: Google evaluates the mobile version\" style=\"width:100%;height:auto;border-radius:12px\" \/><br \/>\n    <\/figure>\n<p>The term marks a fundamental reversal of perspective. For years the desktop version was the authoritative one that Google measured a page against. Because the majority of searches are made on a phone, Google turned the logic around: the basis of the evaluation is the version delivered to a smartphone. In practice that means a website has to be complete, fast and usable on mobile, otherwise it gives away rankings.<\/p>\n<h2 id=\"term-at-a-glance\">The term at a glance<\/h2>\n<table>\n<tr>\n<th>Attribute<\/th>\n<th>Detail<\/th>\n<\/tr>\n<tr>\n<td>Term<\/td>\n<td>Mobile-first indexing (mobile-first index)<\/td>\n<\/tr>\n<tr>\n<td>Category<\/td>\n<td>Technical SEO, crawling and indexing<\/td>\n<\/tr>\n<tr>\n<td>Responsible crawler<\/td>\n<td>Smartphone Googlebot (mobile crawler)<\/td>\n<\/tr>\n<tr>\n<td>Status according to Google<\/td>\n<td>Standard for new sites since July 2019, migration completed in 2023 and 2024<\/td>\n<\/tr>\n<tr>\n<td>Related terms<\/td>\n<td>Responsive design, crawler, Core Web Vitals, mobile usability<\/td>\n<\/tr>\n<\/table>\n<h2 id=\"since-when-and-current-status\">Since when has mobile-first indexing existed and where do things stand?<\/h2>\n<p>Google announced mobile-first indexing in November 2016 and rolled it out step by step over several years. The change did not happen all at once but site by site: Google moved each domain into the mobile index individually, as soon as its mobile version met the requirements. According to Google, mobile-first indexing has applied automatically to <strong>every newly registered website<\/strong> since July 2019.<\/p>\n<p>For existing websites the switch took longer than originally planned. According to Google the migration is now finished: since October 2023 Google crawls almost exclusively with the smartphone Googlebot, and the last exceptions, such as pages that were completely unusable on mobile, followed in 2023 and 2024. Mobile-first indexing is no longer a future scenario, it is the normal state for practically every website in the Google index.<\/p>\n<figure>\n      <a href=\"https:\/\/taismo.de\/en\/seo-audit\/\" title=\"SEO audit by taismo\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 760 230\" role=\"img\" aria-labelledby=\"fig1t fig1d\" style=\"width:100%;height:auto;max-width:760px;font-family:Arial,Helvetica,sans-serif\"><title id=\"fig1t\">Timeline of the rollout of mobile-first indexing<\/title><desc id=\"fig1d\">Google announced mobile-first indexing in 2016, started the rollout in 2017 and 2018, made it the standard for new websites from July 2019 and, according to Google, completed the switch in 2023 and 2024.<\/desc><rect x=\"0\" y=\"0\" width=\"760\" height=\"230\" fill=\"#ffffff\"\/><text x=\"380\" y=\"34\" text-anchor=\"middle\" fill=\"#072328\" font-size=\"18\" font-weight=\"bold\">Mobile-first indexing: the rollout (according to Google)<\/text><line x1=\"70\" y1=\"120\" x2=\"690\" y2=\"120\" stroke=\"#072328\" stroke-width=\"3\"\/><circle cx=\"90\" cy=\"120\" r=\"13\" fill=\"#ED8924\"\/><text x=\"90\" y=\"94\" text-anchor=\"middle\" fill=\"#072328\" font-size=\"15\" font-weight=\"bold\">2016<\/text><text x=\"90\" y=\"158\" text-anchor=\"middle\" fill=\"#55605f\" font-size=\"12\">Announcement<\/text><circle cx=\"290\" cy=\"120\" r=\"13\" fill=\"#ED8924\"\/><text x=\"290\" y=\"94\" text-anchor=\"middle\" fill=\"#072328\" font-size=\"15\" font-weight=\"bold\">2017\/18<\/text><text x=\"290\" y=\"158\" text-anchor=\"middle\" fill=\"#55605f\" font-size=\"12\">Rollout begins<\/text><circle cx=\"490\" cy=\"120\" r=\"13\" fill=\"#ED8924\"\/><text x=\"490\" y=\"94\" text-anchor=\"middle\" fill=\"#072328\" font-size=\"15\" font-weight=\"bold\">July 2019<\/text><text x=\"490\" y=\"158\" text-anchor=\"middle\" fill=\"#55605f\" font-size=\"12\">Standard for new sites<\/text><circle cx=\"670\" cy=\"120\" r=\"15\" fill=\"#072328\"\/><text x=\"670\" y=\"94\" text-anchor=\"middle\" fill=\"#072328\" font-size=\"15\" font-weight=\"bold\">2023\/24<\/text><text x=\"670\" y=\"158\" text-anchor=\"middle\" fill=\"#55605f\" font-size=\"12\">Completed<\/text><text x=\"676\" y=\"216\" text-anchor=\"end\" fill=\"#072328\" font-size=\"11\" opacity=\"0.5\">Fig. 1 &#183; taismo<\/text><\/svg><\/a><figcaption><strong>Fig. 1: Timeline of the rollout of mobile-first indexing, from the announcement in 2016 to the completed switch in 2023 and 2024 (according to Google).<\/strong><\/figcaption><\/figure>\n<h2 id=\"what-it-means-for-your-website\">What does mobile-first indexing mean for your website?<\/h2>\n<p>Mobile-first indexing means that the mobile version of your page alone decides visibility and ranking. Anything a <a href=\"https:\/\/taismo.de\/en\/what-is\/crawler\/\">crawler<\/a> does not find in the smartphone rendering does not enter the evaluation, even if it sits prominently in the desktop view. The decisive point: what counts is not whether your page <em>somehow<\/em> works on mobile, but whether it is <em>complete<\/em> on mobile.<\/p>\n<p>In concrete terms, Google checks the same signals on the mobile version that it used to check on the desktop: the body text, the heading structure, images with their alt attributes, internal links, structured data and the meta information. If those elements are stripped down on mobile, hidden, or buried in accordions that Google does not open, you risk losing rankings. The cleanest technical starting point is <a href=\"https:\/\/taismo.de\/en\/what-is\/responsive-design\/\">responsive design<\/a>: one single HTML version adapts to every screen size through CSS, so desktop and mobile content are guaranteed to be identical.<\/p>\n<figure>\n      <a href=\"https:\/\/taismo.de\/en\/what-is\/responsive-design\/\" title=\"Responsive design in the taismo SEO glossary\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 760 300\" role=\"img\" aria-labelledby=\"fig2t fig2d\" style=\"width:100%;height:auto;max-width:760px;font-family:Arial,Helvetica,sans-serif\"><title id=\"fig2t\">Desktop index in the past compared with the mobile-first index today<\/title><desc id=\"fig2d\">In the past Google evaluated the desktop version of a website. Today the smartphone Googlebot primarily crawls the mobile version, which therefore decides indexing and ranking.<\/desc><rect x=\"0\" y=\"0\" width=\"760\" height=\"300\" fill=\"#ffffff\"\/><text x=\"380\" y=\"34\" text-anchor=\"middle\" fill=\"#072328\" font-size=\"18\" font-weight=\"bold\">What Google evaluates: then and now<\/text><rect x=\"40\" y=\"60\" width=\"330\" height=\"200\" rx=\"16\" fill=\"#ffffff\" stroke=\"#B8C4C4\" stroke-width=\"2\"\/><text x=\"205\" y=\"90\" text-anchor=\"middle\" fill=\"#55605f\" font-size=\"15\" font-weight=\"bold\">Then: desktop index<\/text><rect x=\"95\" y=\"110\" width=\"220\" height=\"120\" rx=\"8\" fill=\"#eef1f1\" stroke=\"#B8C4C4\" stroke-width=\"2\"\/><rect x=\"115\" y=\"130\" width=\"180\" height=\"14\" fill=\"#B8C4C4\"\/><rect x=\"115\" y=\"156\" width=\"180\" height=\"9\" fill=\"#cfd6d6\"\/><rect x=\"115\" y=\"174\" width=\"140\" height=\"9\" fill=\"#cfd6d6\"\/><text x=\"205\" y=\"252\" text-anchor=\"middle\" fill=\"#55605f\" font-size=\"12\">Judged by the desktop version<\/text><rect x=\"390\" y=\"60\" width=\"330\" height=\"200\" rx=\"16\" fill=\"#072328\"\/><text x=\"555\" y=\"90\" text-anchor=\"middle\" fill=\"#ffffff\" font-size=\"15\" font-weight=\"bold\">Today: mobile-first index<\/text><rect x=\"505\" y=\"108\" width=\"100\" height=\"130\" rx=\"12\" fill=\"#0f343a\" stroke=\"#ED8924\" stroke-width=\"3\"\/><rect x=\"520\" y=\"126\" width=\"70\" height=\"12\" fill=\"#ED8924\"\/><rect x=\"520\" y=\"148\" width=\"70\" height=\"8\" fill=\"#8a9a9c\"\/><rect x=\"520\" y=\"164\" width=\"52\" height=\"8\" fill=\"#8a9a9c\"\/><rect x=\"520\" y=\"184\" width=\"70\" height=\"8\" fill=\"#8a9a9c\"\/><circle cx=\"555\" cy=\"226\" r=\"4\" fill=\"#ED8924\"\/><text x=\"555\" y=\"252\" text-anchor=\"middle\" fill=\"#B8C4C4\" font-size=\"12\">The smartphone Googlebot crawls mobile<\/text><text x=\"380\" y=\"284\" text-anchor=\"middle\" fill=\"#ED8924\" font-size=\"14\" font-weight=\"bold\">The mobile version decides the ranking<\/text><text x=\"712\" y=\"292\" text-anchor=\"end\" fill=\"#072328\" font-size=\"11\" opacity=\"0.5\">Fig. 2 &#183; taismo<\/text><\/svg><\/a><figcaption><strong>Fig. 2: The change of perspective through mobile-first indexing. The basis of the evaluation is no longer the desktop version but the mobile one.<\/strong><\/figcaption><\/figure>\n<h2 id=\"most-common-problems\">Which problems come up most often?<\/h2>\n<p>Most mobile-first problems arise because the mobile version contains less than the desktop version. Google then evaluates that stripped down version and the rest is lost. These are the four most common pitfalls:<\/p>\n<ol>\n<li><strong>Content gaps between desktop and mobile:<\/strong> texts, product descriptions or entire sections that are removed or shortened on mobile to save space. Whatever is missing on mobile is no longer indexed.<\/li>\n<li><strong>Missing structured data:<\/strong> JSON-LD that is only delivered in the desktop version. For rich results, what counts is the mobile version, and it has to carry the same <a href=\"https:\/\/taismo.de\/en\/what-is\/structured-data\/\">structured data<\/a>.<\/li>\n<li><strong>Hidden or blocked rendering:<\/strong> content that only loads on interaction through <a href=\"https:\/\/taismo.de\/en\/what-is\/lazy-loading\/\">lazy loading<\/a>, or blocked resources (CSS, JavaScript, images) that the smartphone Googlebot is not allowed to fetch. Google then sees an empty or half finished page.<\/li>\n<li><strong>Poor mobile performance and usability:<\/strong> tap targets that are too small, layout shifts and long loading times. These factors enter the evaluation through the <a href=\"https:\/\/taismo.de\/en\/what-is\/core-web-vitals\/\">Core Web Vitals<\/a> and mobile usability.<\/li>\n<\/ol>\n<p>Strikingly often these problems affect websites with separate URLs for desktop and mobile, for example a separate <code>m.example.com<\/code> subdomain. In everyday work the two versions drift apart easily, because editors only maintain the desktop page. Setups like that cause the worst mobile-first drops.<\/p>\n<h2 id=\"how-to-become-mobile-first-ready\">How do you make a site mobile-first ready?<\/h2>\n<p>A page becomes mobile-first ready when the mobile version catches up with the desktop version in content and in technology. The goal is parity: everything that ranks on the desktop has to be present and crawlable on mobile too. The most important steps:<\/p>\n<ul>\n<li><strong>Build on responsive design:<\/strong> a shared HTML base for every device prevents desktop and mobile content from falling apart in the first place.<\/li>\n<li><strong>Check content parity:<\/strong> make sure the main text, headings, images (including alt texts), internal links and meta data are delivered in full on mobile.<\/li>\n<li><strong>Mirror the structured data:<\/strong> provide the same JSON-LD markup in both versions so that rich results are kept.<\/li>\n<li><strong>Release your resources:<\/strong> do not block CSS, JavaScript and images for the crawler in the <a href=\"https:\/\/taismo.de\/en\/what-is\/robots-txt\/\">robots.txt<\/a>, so Google can render the page completely.<\/li>\n<li><strong>Optimize mobile performance:<\/strong> keep an eye on loading times and Core Web Vitals, compress images and avoid layout shifts.<\/li>\n<li><strong>Check the result:<\/strong> use the URL inspection tool in the <a href=\"https:\/\/taismo.de\/en\/what-is\/google-search-console\/\">Google Search Console<\/a> to see what the smartphone Googlebot actually renders and indexes.<\/li>\n<\/ul>\n<p>In practice, being mobile-first ready is not a one off project but part of a clean technical foundation. Anyone who builds a site responsively and fast from the start has largely settled the topic. That is exactly where professional <a href=\"https:\/\/taismo.de\/en\/webdesign\/\">web design<\/a> comes in, and in day to day operation continuous <a href=\"https:\/\/taismo.de\/en\/seo-services\/\">SEO management<\/a> keeps the mobile version technically sound.<\/p>\n<h2 id=\"faq-mobile-first-indexing\">Frequently asked questions about mobile-first indexing<\/h2>\n<p><strong>Is mobile-first indexing the same as a mobile-friendliness ranking factor?<\/strong><br \/>No. Mobile-first indexing describes <em>which<\/em> version Google uses as the basis of its evaluation, namely the mobile one. Mobile friendliness is a separate quality signal. The two are connected, but they are not the same thing.<\/p>\n<p><strong>Do I need a separate mobile website?<\/strong><br \/>No, quite the opposite. A separate mobile URL is more of a risk today, because the two versions can drift apart. The recommended setup is responsive design with a single HTML version for every device.<\/p>\n<p><strong>Are desktop users put at a disadvantage?<\/strong><br \/>No. Mobile-first indexing only affects the basis of Google&#8217;s evaluation, not what your server delivers. Desktop visitors still get the full desktop view.<\/p>\n<p><strong>How do I see whether my page is indexed from the mobile version?<\/strong><br \/>Through the URL inspection tool in the Google Search Console. It shows which crawler (smartphone or desktop Googlebot) last indexed a URL and what the rendered page looks like.<\/p>\n<\/p><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>IKI Contents The term at a glance Since when has mobile-first indexing existed and where do things stand? What does mobile-first indexing mean for your website? Which problems come up most often? How do you make a site mobile-first ready? Frequently asked questions about mobile-first indexing What is mobile-first indexing? Mobile-first indexing is the procedure [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":6382,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_taismo_jsonld":"","taismo_jsonld":"{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/taismo.de\/en\/what-is\/mobile-first-indexing\/#webpage\",\"url\":\"https:\/\/taismo.de\/en\/what-is\/mobile-first-indexing\/\",\"name\":\"What is mobile-first indexing?\",\"isPartOf\":{\"@id\":\"https:\/\/taismo.de\/#website\"},\"inLanguage\":\"en\",\"datePublished\":\"2026-07-23T09:00:00+02:00\",\"dateModified\":\"2026-07-26T01:55:20+02:00\",\"primaryImageOfPage\":{\"@id\":\"https:\/\/taismo.de\/en\/what-is\/mobile-first-indexing\/#primaryimage\"},\"mainEntity\":{\"@id\":\"https:\/\/taismo.de\/en\/what-is\/mobile-first-indexing\/#definedterm\"},\"breadcrumb\":{\"@id\":\"https:\/\/taismo.de\/en\/what-is\/mobile-first-indexing\/#breadcrumb\"},\"speakable\":{\"@type\":\"SpeakableSpecification\",\"cssSelector\":[\".brand-claim\",\".lead-def\"]},\"author\":{\"@id\":\"https:\/\/taismo.de\/#person-dominik-breitbach\"},\"publisher\":{\"@id\":\"https:\/\/taismo.de\/#organization\"}},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/taismo.de\/en\/what-is\/mobile-first-indexing\/#primaryimage\",\"contentUrl\":\"https:\/\/taismo.de\/wp-content\/uploads\/2026\/07\/mobile-first-indexing.png\",\"url\":\"https:\/\/taismo.de\/wp-content\/uploads\/2026\/07\/mobile-first-indexing.png\",\"width\":1200,\"height\":675,\"caption\":\"Mobile-first indexing explained: Google primarily indexes the mobile version of a website with the smartphone Googlebot\"},{\"@type\":\"DefinedTerm\",\"@id\":\"https:\/\/taismo.de\/en\/what-is\/mobile-first-indexing\/#definedterm\",\"name\":\"Mobile-first indexing\",\"termCode\":\"mobile-first-indexing\",\"url\":\"https:\/\/taismo.de\/en\/what-is\/mobile-first-indexing\/\",\"inLanguage\":\"en\",\"inDefinedTermSet\":{\"@id\":\"https:\/\/taismo.de\/#seo-wiki\"},\"description\":\"Mobile-first indexing is the procedure by which Google primarily uses the mobile version of a website for indexing and ranking. Google crawls and evaluates the content a smartphone user gets to see, not the desktop version, so whatever is missing on the phone effectively does not exist for the evaluation.\",\"author\":{\"@id\":\"https:\/\/taismo.de\/#person-dominik-breitbach\"},\"publisher\":{\"@id\":\"https:\/\/taismo.de\/#organization\"}},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/taismo.de\/en\/what-is\/mobile-first-indexing\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/taismo.de\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"SEO Glossary\",\"item\":\"https:\/\/taismo.de\/en\/what-is\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Mobile-first indexing\"}]},{\"@type\":\"FAQPage\",\"@id\":\"https:\/\/taismo.de\/en\/what-is\/mobile-first-indexing\/#faqpage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Is mobile-first indexing the same as a mobile-friendliness ranking factor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Mobile-first indexing describes which version Google uses as the basis of its evaluation, namely the mobile one. 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See what mobile-first indexing changes, where it breaks and how to get your site ready \ud83d\udcf1\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/taismo.de\/en\/what-is\/mobile-first-indexing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is Mobile-First Indexing? Status &amp; Fixes | taismo\" \/>\n<meta property=\"og:description\" content=\"Google ranks your mobile version, not your desktop one. 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