What does Google say about SEO? /
The Crawl & Indexing category compiles all official Google statements regarding how Googlebot discovers, crawls, and indexes web pages. These fundamental processes determine which pages from your website will be included in Google's index and potentially appear in search results. This section addresses critical technical mechanisms: crawl budget management to optimize allocated resources, strategic implementation of robots.txt files to control content access, noindex directives for page exclusion, XML sitemap configuration to enhance discoverability, along with JavaScript rendering challenges and canonical URL implementation. Google's official positions on these topics are essential for SEO professionals as they help avoid technical blocking issues, accelerate new content indexation, and prevent unintentional deindexing. Understanding Google's crawling and indexing processes forms the foundation of any effective search engine optimization strategy, directly impacting organic visibility and SERP performance. Whether troubleshooting indexation problems, optimizing crawl efficiency for large websites, or ensuring proper URL canonicalization, these official guidelines provide authoritative answers to complex technical SEO questions that shape modern web presence and discoverability.
★★★ Should You Delete Past Event Pages or Keep Them for SEO?
John Mueller provided practical advice on the SEO management of web pages for shows, events or performances once they have ended. He compares this situation to that of out-of-stock products in e-comme...
John Mueller Jul 29, 2025
★★★ Do You Really Need a New 'GEO' Strategy to Show Up in Google's AI Overviews?
Google confirms that no particular optimization is necessary for AI Overviews and AI Mode. Gary Illyes has clearly established that traditional SEO practices are more than sufficient to rank in the ne...
Gary Illyes Jul 29, 2025
★★ Should You Use a Noindex Header to Protect Your llms.txt Files from Google Indexing?
John Mueller answered a question about llms.txt files and their potential impact as duplicate content. He explained that these files would only be considered duplicate content if their content was ide...
John Mueller Jul 29, 2025
★★★ Should you really use the canonical tag to manage tracking parameters?
Google recommends using the actual Canonical URL tag to prevent the appearance of tracking parameters in search results. It's a practical and effective method to indicate the preferred version of the ...
Google Jul 25, 2025
★★ Should you use noindex or robots.txt to manage tracking parameters? Here's what Google actually recommends
Meta noindex tags and the robots.txt file are alternatives for managing URLs with tracking parameters. Each method presents advantages and disadvantages that must be weighed according to your context....
Google Jul 25, 2025
★★★ Is CSS ::before and ::after content really invisible to Google?
Content added via CSS pseudo-elements ::before and ::after does not appear in the DOM and will therefore not be taken into account by crawlers and accessibility tools. This content should only be used...
Martin Splitt Jul 24, 2025
★★ Why does Google require <img> tags for stock images instead of CSS?
Even though stock images probably won't be indexed (Google acknowledges they already exist elsewhere), from a semantic standpoint, if they're part of the page's content, they should be in the HTML wit...
Martin Splitt Jul 24, 2025
★★ Does 100vh really cause indexation problems for your hero images?
Using 100vh (100% of the viewport height) for hero images can cause problems with the Inspect URL tool due to viewport expansion used during rendering. However, the content remains accessible in the D...
Martin Splitt Jul 24, 2025
★★ Why does Google require your CSS files to be crawlable?
Google's guidelines indicate that CSS files must be crawlable, which suggests they have a certain importance for the page indexation and rendering process....
John Mueller Jul 24, 2025
★★★ Why does Google fail to recognize hashtags generated through CSS ::before?
The indexation team reported a case where a site used CSS ::before to add the # symbol in front of keywords. The indexation system did not recognize these hashtags because the # symbol was not in the ...
John Mueller Jul 24, 2025
★★★ Why aren't your CSS background images ever showing up in Google Images?
Images loaded via CSS background-image are considered decorative. If an image is integral to your content (product photo, infographic referenced in text), it must use an <img> or <picture> tag to be p...
Martin Splitt Jul 24, 2025
★★★ Could strict HTML and CSS separation be the missing piece in your indexation strategy?
There exists a fundamental principle of the web: content must be in HTML and presentation in CSS. Crawlers and accessibility tools parse HTML for content, not CSS. Violating this principle can prevent...
Martin Splitt Jul 24, 2025
★★★ Why Won't Google Index Your Content Despite Flawless Technical SEO?
On Bluesky, John Mueller indicated that if a technically sound site is poorly indexed by Google, it often means that Google considers its quality or relevance insufficient. Google does not index all c...
John Mueller Jul 22, 2025
★★★ Why Does Google Struggle to Properly Index Your Login Pages and Member Areas?
John Mueller explained on Bluesky that login pages for services (such as analytics or billing interfaces) are difficult to rank well in Google or Bing search results. These pages requiring authenticat...
John Mueller Jul 22, 2025
★★★ Should you block a page from being indexed just to prevent it from appearing as a sitelink?
The only workaround solution to prevent a subpage from appearing as a sitelink is to completely block its indexation. However, this approach will also prevent the page from appearing in all search res...
John Mueller Jul 17, 2025
★★★ Does the Order of Links in Your Disavow File Really Matter to Google?
On Bluesky, John Mueller explained that the order of URLs or sites listed in the disavow file has no importance whatsoever. Google does not process this file in real-time, but takes it into account du...
John Mueller Jul 15, 2025
★★ Why can't you rely on staging environments to validate your SEO improvements?
Unlike technical tests, staging sites don't allow effective SEO testing because you generally don't want search engines to index them. SEO testing must be done on the production site....
Martin Splitt Jul 10, 2025
★★ Is searching your domain name on Google really enough to verify your site's technical health?
To verify that your site is technically sound, search your site by its name and domain name in Google. If results appear, the technical configuration is probably acceptable....
Martin Splitt Jul 10, 2025
★★★ Do you really need to optimize your site differently for AI Overviews and AI Mode?
Sites don't need to do anything special beyond being indexable to be eligible for AI features like AI Overviews or AI Mode. No new structured data, special files for LLMs, or content redesigns are nec...
John Mueller Jul 01, 2025
★★ Do AI Overviews really drive traffic to a wider range of websites?
AI Overviews directs users to a greater diversity of websites, particularly for complex queries requiring exploration, reasoning, or advanced comparisons....
John Mueller Jul 01, 2025
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