{"id":7177,"date":"2026-04-24T11:27:36","date_gmt":"2026-04-24T05:57:36","guid":{"rendered":"https:\/\/www.stanventures.com\/news\/?p=7177"},"modified":"2026-04-24T11:27:36","modified_gmt":"2026-04-24T05:57:36","slug":"google-studied-16-million-robots-txt-files-heres-what-they-found","status":"publish","type":"post","link":"https:\/\/www.stanventures.com\/news\/google-studied-16-million-robots-txt-files-heres-what-they-found-7177\/","title":{"rendered":"Google Studied 16 Million Robots.txt Files: Here\u2019s What They Found"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Google&#8217;s Gary Illyes and Martin Splitt quietly did something that no one in the SEO industry had done before: they ran a custom parser across the <\/span><a href=\"https:\/\/www.stanventures.com\/news\/googles-martin-splitt-explains-robots-txt-best-practices-1388\/\"><span style=\"font-weight: 400;\">robots.txt file<\/span><\/a><span style=\"font-weight: 400;\"> of millions of real websites and looked at what directives people actually use.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This project transformed a simple GitHub pull request into a comprehensive data study to better align Search Console with actual webmaster behavior.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The team used a custom JavaScript parser to mimic Google&#8217;s official C++ logic, allowing them to document real-world usage patterns of robots.txt at scale.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The results, discussed in Episode 108 of Google&#8217;s Search Off the Record podcast.<\/span><\/p>\n<p><iframe loading=\"lazy\" title=\"Analysing Robots.txt at scale with HTTP Archive and BigQuery\" width=\"500\" height=\"375\" src=\"https:\/\/www.youtube.com\/embed\/DchuJS7JWvk?start=286&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\"><\/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:\/\/www.stanventures.com\/news\/google-studied-16-million-robots-txt-files-heres-what-they-found-7177\/#what-16-million-robotstxt-files-actually-look-like\" >What 16 Million Robots.txt Files Actually Look Like<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.stanventures.com\/news\/google-studied-16-million-robots-txt-files-heres-what-they-found-7177\/#what-google-will-do-with-this\" >What Google Will Do with This<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.stanventures.com\/news\/google-studied-16-million-robots-txt-files-heres-what-they-found-7177\/#what-this-means-for-your-robotstxt\" >What This Means for Your robots.txt<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.stanventures.com\/news\/google-studied-16-million-robots-txt-files-heres-what-they-found-7177\/#key-takeaways\" >Key Takeaways<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"what-16-million-robotstxt-files-actually-look-like\"><\/span><b>What 16 Million Robots.txt Files Actually Look Like<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>Three directives dominate everything else.<\/b><span style=\"font-weight: 400;\"> The distribution of directives found across millions of robots.txt files shows an almost vertical drop-off after the three most common entries: <\/span><span style=\"font-weight: 400;\">allow<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">disallow<\/span><span style=\"font-weight: 400;\">, and <\/span><span style=\"font-weight: 400;\">user-agent<\/span><span style=\"font-weight: 400;\">. Even plotted on a logarithmic scale, the gap between those three and everything else is stark. For the vast majority of the web, robots.txt is essentially just those three directives in various combinations.<\/span><\/p>\n<p><b>Most sites return a valid robots.txt \u2014 but 13% don&#8217;t.<\/b><span style=\"font-weight: 400;\"> Of all the URLs in the crawl set, 84.9% return a 200 status code for their robots.txt file. 13% return a 404, meaning no robots.txt exists at all. Timeouts, 403s, and 500 errors each account for less than 1%.<\/span><\/p>\n<p><b>File sizes are small.<\/b><span style=\"font-weight: 400;\"> The overwhelming majority of robots.txt files fall between 0 and 100 kilobytes. There is no practical case for a large, complex file.<\/span><\/p>\n<p><b>The wildcard user-agent dominates.<\/b><span style=\"font-weight: 400;\"> The <\/span><span style=\"font-weight: 400;\">*<\/span><span style=\"font-weight: 400;\"> user-agent, which applies rules to all crawlers, is by far the most commonly used. It appears across a large share of all robots.txt files in the dataset, confirming that most site owners write blanket rules rather than crawler-specific ones.<\/span><\/p>\n<p><b>Googlebot is named far less often than you might expect.<\/b> <span style=\"font-weight: 400;\">AdsBot-Google<\/span><span style=\"font-weight: 400;\"> appears as a named user-agent in 9.8% of files. <\/span><span style=\"font-weight: 400;\">Googlebot<\/span><span style=\"font-weight: 400;\"> by name appears in only 6.2%. Most sites that want to control Googlebot&#8217;s behaviour are doing it through the wildcard.<\/span><\/p>\n<p><b>Broken files are common.<\/b><span style=\"font-weight: 400;\"> The parser also surfaced a significant number of robots.txt files that are not valid \u2014 HTML pages with CSS returned instead of a plain-text directive file, typically because the server has no robots.txt and is returning a 404 page with a 200 status. These show up in the data as lines containing tags like <\/span><span style=\"font-weight: 400;\">padding<\/span><span style=\"font-weight: 400;\"> and <\/span><span style=\"font-weight: 400;\">img<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><b>Typos in <\/b><b>disallow<\/b><b> are a real pattern.<\/b><span style=\"font-weight: 400;\"> The dataset makes it possible to identify common misspellings of the <\/span><span style=\"font-weight: 400;\">disallow<\/span><span style=\"font-weight: 400;\"> directive. Gary noted he plans to expand Google&#8217;s typo-tolerance to account for the most frequent ones found in the data.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"what-google-will-do-with-this\"><\/span><b>What Google Will Do with This<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The direct outcome of the project is an expansion of <\/span><a href=\"https:\/\/developers.google.com\/search\/docs\"><span style=\"font-weight: 400;\">Google&#8217;s Search Console documentation<\/span><\/a><span style=\"font-weight: 400;\">: the list of supported and unsupported robots.txt directives will be updated based on what the data shows people are actually using, rather than what was previously assumed.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Directives that appear rarely or not at all have less justification for documentation; those that appear frequently but are unsupported will be explicitly flagged.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The custom metric is now live in the HTTP Archive and will feed into this year&#8217;s <\/span><a href=\"https:\/\/almanac.httparchive.org\/en\/2025\/seo\"><span style=\"font-weight: 400;\">Web Almanac SEO chapter,<\/span><\/a><span style=\"font-weight: 400;\"> giving the broader SEO community access to a more granular view of robots.txt usage than has previously been available.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"what-this-means-for-your-robotstxt\"><\/span><b>What This Means for Your robots.txt<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The data makes a simple case: robots.txt, for most sites, should be simple. The three directives that cover virtually every real-world need are <\/span><span style=\"font-weight: 400;\">allow<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">disallow<\/span><span style=\"font-weight: 400;\">, and <\/span><span style=\"font-weight: 400;\">user-agent<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Anything beyond that is used by a small fraction of sites, and if it is not on Google&#8217;s supported list, Search Console is likely already flagging it as unrecognised.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If your robots.txt contains custom directives borrowed from a guide or plugin, it is worth auditing. The chances are high that those directives are doing nothing \u2014 and the data from 16 million pages now backs that up.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"key-takeaways\"><\/span><b>Key Takeaways<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>Large-Scale Analysis:<\/b><span style=\"font-weight: 400;\"> Google analyzed robots.txt files across 16 million URLs using the HTTP Archive, WebPageTest, and BigQuery.<\/span><\/p>\n<p><b>Dominant Directives:<\/b><span style=\"font-weight: 400;\"> The <\/span><span style=\"font-weight: 400;\">allow<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">disallow<\/span><span style=\"font-weight: 400;\">, and <\/span><span style=\"font-weight: 400;\">user-agent<\/span><span style=\"font-weight: 400;\"> tags account for almost all usage, with a sharp decline in other directives.<\/span><\/p>\n<p><b>Server Responses:<\/b><span style=\"font-weight: 400;\"> About 84.9% of sites provide a valid 200 status for robots.txt, while 13% return a 404 error.<\/span><\/p>\n<p><b>Bot Mentions:<\/b><span style=\"font-weight: 400;\"> AdsBot-Google appears in 9.8% of files, whereas Googlebot is specifically named in only 6.2%.<\/span><\/p>\n<p><b>Data Quality Issues:<\/b><span style=\"font-weight: 400;\"> A frequent problem discovered was &#8220;broken&#8221; files, where standard HTML pages are incorrectly served as robots.txt.<\/span><\/p>\n<p><b>Future Updates:<\/b><span style=\"font-weight: 400;\"> These insights will be used to refresh Google Search Console documentation and will be featured in the 2025 Web Almanac.<\/span><\/p>\n<p><b>Link Building: <\/b><span style=\"font-weight: 400;\">When delivering guest posts or <\/span><a href=\"https:\/\/www.stanventures.com\/powerful-link-building-service\/\"><span style=\"font-weight: 400;\">backlink services<\/span><\/a><span style=\"font-weight: 400;\">, ensure the robots.txt if the selected site isn&#8217;t blocking Google because the content will not index and the effort to acquire links becomes futile.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Google&#8217;s Gary Illyes and Martin Splitt quietly did something that no one in the SEO industry had done before: they ran a custom parser across the robots.txt file of millions of real websites and looked at what directives people actually use. This project transformed a simple GitHub pull request into a comprehensive data study to [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-7177","post","type-post","status-publish","format-standard","hentry","category-seo"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Google Studied 16 Million Robots.txt Files: Here\u2019s What They Found<\/title>\n<meta name=\"description\" content=\"Google analyzed 16 million robots.txt files and the results are surprising. 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