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.
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★★ Does Google Cache Really Require Your Active Management?
Google's cache is built automatically when Google indexes pages. No specific action from the webmaster is required to manage it....
John Mueller Jul 20, 2018
★★ Why don't Google's live testing tools always reflect actual indexing?
Testing tools like Fetch and Render are more patient and reliable for seeing how Google views a page compared to live testing tools that have strict time limits to obtain quick results....
John Mueller Jul 20, 2018
★★ Should you really use noindex in JavaScript for out-of-stock pages?
A noindex tag added via JavaScript is recognized by Google, but the processing may be delayed because JavaScript rendering takes longer. This differs if the noindex tag is present from the initial loa...
John Mueller Jul 20, 2018
★★★ Does Google really keep a page indexed after a 500 or 404 error?
Google is resilient to 500 and 404 errors. If the page is important, Google may retain its indexed status until the page becomes accessible again....
John Mueller Jul 20, 2018
★★★ How can you remove an entire section of your website from Google in under 24 hours?
To quickly remove an entire section of a website, using Google's URL removal tool for specific directories allows for removal in less than one day. More fragmentary removals require the use of 404 cod...
John Mueller Jul 20, 2018
★★★ Can the robots.txt really block the indexing of your pages?
A noindex directive in the robots.txt file is not officially supported and may not work anymore. It is recommended not to rely on this method to prevent the indexing of pages....
John Mueller Jul 20, 2018
★★★ Should you really combine canonical and hreflang to manage multilingual duplicate content?
To manage duplicate content from authoritative sources, it is recommended to use the rel=canonical tag to reinforce the canonical source. Hreflang should be used if the content is specifically transla...
John Mueller Jul 20, 2018
★★★ Why does Google refuse to index pages with no visible content in the body?
If a page does not display its main content in the body for Google (such as content hidden behind a login), Google considers this page empty and will not index it....
John Mueller Jul 20, 2018
★★★ Should you re-upload your disavow file after a domain migration?
During a domain migration, it is crucial to re-upload the disavow file; otherwise, disavowed links could be included in Google's link graph when they are recrawled....
John Mueller Jul 20, 2018
★★★ How can you reduce signal transfer time during a site migration?
During site migrations, make sure that all URLs clearly redirect to the new version. Avoid crawl errors and eliminate unnecessary blocks in robots.txt to facilitate signal transfer....
John Mueller Jul 20, 2018
★★★ Should you fix all the 404 and 500 errors flagged in Search Console?
The performance reports in the new Search Console show site performance, while the Crawl Errors section displays errors encountered while attempting to crawl your site. Errors like 500 and 404 can be ...
John Mueller Jul 20, 2018
★★ HTTPS and Mobile Indexing: Why Does Google Treat HTTP and HTTPS as Two Different Sites?
Migrating a HTTP version to mobile indexing does not guarantee that the HTTPS version has also transitioned to mobile indexing. Google treats HTTP and HTTPS separately....
John Mueller Jul 20, 2018
★★★ Does mobile-first indexing really change the snippets visible to all mobile users?
During the transition to mobile-first indexing, all users coming from mobile search should see a snippet that closely matches the mobile content of the site....
John Mueller Jul 20, 2018
★★★ Can 500 Errors Really Slow Down Google's Crawling of Your Site?
John Mueller explained on Twitter that when a server returns numerous 5xx errors (500 or similar), it can cause crawling problems. Indeed, in this case, Googlebot's crawl is slowed down and exploratio...
John Mueller Jul 16, 2018
★★★ Should You Block Crawling of the robots.txt File in the robots.txt Itself?
John Mueller explained on Twitter that it's pointless to prevent search engines from crawling the robots.txt file by adding a "Disallow:" directive for that very file in the... robots.txt itself??....
John Mueller Jul 02, 2018
★★★ Why Does Every Indexed URL Necessarily Have a Canonical URL?
John Mueller indicated on Twitter and during a hangout that every web page, therefore every URL indexed by the search engine, was associated with a canonical URL, which could be the same (if the page ...
John Mueller Jul 02, 2018
★★ Does duplicate navigation really harm the crawl budget?
Having duplicate navigation for responsive and mobile versions of a site does not affect the crawl budget or search performance....
John Mueller Jun 29, 2018
★★ Do responsive images really boost your SEO?
While responsive images are beneficial for user experience, they will not necessarily guarantee higher SEO traffic if simply indexed as images....
John Mueller Jun 29, 2018
★★★ Why does Google seem to index the wrong version of your URLs?
Ambiguous signals sent by a site can lead Google to index the wrong version of a URL. Clarify the signals (redirects, canonicals, internal links) to indicate your preference....
John Mueller Jun 29, 2018
★★★ Does Google really follow your canonical tags or does it decide on its own?
When multiple URLs contain the same content, Google tries to understand the site's preferences for the canonical URL through different signals. Clear preferences are more likely to be followed by Goog...
John Mueller Jun 29, 2018
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