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 Googlebot Really Use Cookies to Crawl Your Website?
Gary Illyes published one of his "DYK" (Do You Know) posts about cookies: Googlebot generally doesn't make use of cookies, but it can if it detects it cannot get to the content without them?. In other...
Gary Illyes Mar 27, 2017
★★★ Is the mobile-first index really forcing drastic changes to your website?
Google is testing mobile-first indexing with the goal of ensuring that website owners do not have to worry about the transition. The focus is on analyzing potential implications and adjustments withou...
John Mueller Mar 24, 2017
★★ Why do HTTPS migrations break your canonicalization?
Issues can arise in recognizing canonical URLs during HTTP to HTTPS migrations due to Google's algorithms. Proper implementation of redirects and internal links remains crucial....
John Mueller Mar 24, 2017
★★★ Does robots.txt or noindex really block your pages from being indexed?
Blocking indexing with 'robots.txt' prevents Google from seeing the content but does not stop link tracking to the site. 'Noindex' removes the content from the index but requires the content to be acc...
Google Mar 16, 2017
★★★ How can you properly handle 503 errors during maintenance without losing your SEO rankings?
John Mueller provided some advice on Google's Webmaster Blog if you temporarily close your site for maintenance operations: block the payment system (for example via the robots.txt file), warn visitor...
John Mueller Mar 13, 2017
★★ Should you really be worried about 404 errors reported in Search Console?
404 errors reported in Search Console generally do not pose website quality issues. They can result from pages that previously existed. Technologies such as redirects or updating sitemaps can improve ...
John Mueller Mar 10, 2017
★★★ Why should hreflang and canonical URLs always be in sync?
Hreflang tags must point to canonical URLs because Google does not often crawl non-canonical URLs, making it challenging to verify hreflang links....
John Mueller Mar 10, 2017
★★★ Is mobile-first indexing making debugging dynamic serving impossible?
Shifting to a mobile-first index can complicate debugging sites that use dynamic serving, as crawls must correctly capture the content versions corresponding to different user agents....
John Mueller Mar 10, 2017
★★★ Can the speed of indexing save (or doom) your news websites?
For news websites, it is crucial that content is indexed quickly. Freshness and speed of appearing in search results are essential for these sites. It is recommended to analyze the crawl rate and opti...
John Mueller Mar 10, 2017
★★★ Is it true that AngularJS is compatible with Google's crawl?
Using AngularJS for client-side rendering is compatible with Google if the rendering is displayed correctly in the 'Fetch as Google' function. However, debugging may prove more complex compared to sta...
John Mueller Mar 10, 2017
★★★ Why doesn't Google index all your pages even if your site is technically sound?
Google does not index all pages of a website. Reasons may be technical or related to quality. Using the 'Fetch as Google' function in Search Console can help determine if a technical issue is preventi...
John Mueller Mar 10, 2017
★★★ Should you worry about duplicate content when HTTP and HTTPS are indexed simultaneously?
There is no major duplicate content issue if both HTTP and HTTPS are indexed, as Google combines them into one version in the index....
John Mueller Mar 09, 2017
★★ What’s the Real Difference Between 404 and 410 Codes for De-indexing Your Dead Pages?
Pages with a 410 code disappear slightly faster from the index than those with a 404 code, as they indicate a permanent removal. However, in most cases, this does not make a significant difference....
John Mueller Mar 09, 2017
★★★ Could pointing all your paginated pages to page 1 with rel=canonical ruin your indexing?
In paginated sites, using the rel=canonical tag to direct all pages to the first one can hinder the indexing of detail pages if they are only accessible through these paginated pages....
John Mueller Mar 09, 2017
★★★ Can SPAs really be indexed without valid URLs?
For Google to properly index single page applications, it is essential to use valid URLs rather than simply changing the page content through JavaScript. These URLs must be copyable and directly acces...
John Mueller Mar 09, 2017
★★ Can Switching to a JavaScript Framework Really Break Your SEO?
Changing JavaScript frameworks, such as switching from jQuery to React, can affect indexing if pages are not properly rendered for crawlers. It is essential to ensure that all URLs and content are acc...
John Mueller Mar 09, 2017
★★ Is it true that merging two sites through a subdirectory guarantees a simple reindexing by Google?
Merging two sites by moving one site into the subdirectory of another is acceptable. Google will treat this as a reindexing, but there may be temporary fluctuations in ranking during the familiarizati...
John Mueller Mar 09, 2017
★★★ Are JavaScript-generated URLs truly indexable by Google?
For Single Page Applications, it is essential that the URLs generated via pushState are unique and directly accessible to allow Google to index them and lead users to specific pages....
John Mueller Mar 09, 2017
★★ Could the CMS you choose actually harm your organic SEO?
The way CMSs are used can influence how Google renders and indexes content. JavaScript frameworks like React or jQuery need to be properly configured to ensure that pages are rendered correctly by cra...
John Mueller Mar 09, 2017
★★ Will the mobile-first index really take six months to settle in?
The complete transition to a mobile index will take at least six months. The timeline will depend on ongoing tests and the readiness status of webmasters....
John Mueller Mar 09, 2017
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