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.
★★ Are iframes in your <head> really killing your SEO?
If iframes are injected into the head by third-party scripts, this can theoretically close the head tag prematurely. However, if the URL inspection tool confirms that important tags (title, canonical)...
Google Mar 05, 2026
★★ Does web performance really improve your organic search rankings?
Performance improvements that speed up loading for users (via preload, prefetch, etc.) have positive side effects on SEO because studies show that users appreciate fast sites, with better retention an...
Gary Illyes Feb 26, 2026
★★ Why does Googlebot ignore your resource preloading hints?
When rendering pages, Google caches the necessary resources on its side rather than fetching them each time. This approach saves bandwidth and reduces the load on hosting servers, which explains why c...
Gary Illyes Feb 26, 2026
★★★ Does Google really ignore canonical tags placed in the <body>? Here's why it matters.
Google does not accept link rel=canonical tags located in the <body> of the page. If this powerful signal were accepted in the body, a malicious user could place it in a comment and hijack a page's se...
Gary Illyes Feb 26, 2026
★★★ Why does modifying canonicals with JavaScript create contradictory signals that confuse Google?
When a canonical tag is present in the initial HTML and then modified by JavaScript, this creates mixed signals that are difficult to interpret. Google discourages changing metadata with JavaScript be...
Martin Splitt Feb 26, 2026
★★ Should you really optimize preloading hints for Googlebot?
Google does not use or barely uses link hints like DNS prefetch, preconnect, preload or prefetch, because its infrastructure works differently from browsers: no synchronous resource fetching, Google-s...
Gary Illyes Feb 26, 2026
★★★ Why Can Displaying 'Not Available' via JavaScript Kill Your Google Indexing?
John Mueller strongly advises against displaying "not available" via JavaScript before the actual content loads. This practice can lead Google to believe that the page doesn't exist, preventing its in...
John Mueller Feb 17, 2026
★★★ Why could your HTTPS site display an incorrect name and favicon in Google due to a phantom HTTP page?
John Mueller from Google revealed an unusual issue: an old invisible HTTP homepage can cause malfunctions in the display of the site name and favicon in Google search results. The context: a site was...
John Mueller Feb 17, 2026
★★★ Is faceted navigation really eating up half of your crawl budget?
Faceted navigation (filters and sorting on e-commerce sites) accounts for nearly 50% of crawl problem reports received in 2025. It creates URL combinations that can overwhelm servers because Googlebot...
Gary Illyes Feb 03, 2026
★★★ Are action parameters in your URLs sabotaging your crawl budget?
Action parameters (such as add_to_cart=true or add_to_wishlist=true) in URLs represent approximately 25% of crawl problem reports. These parameters can double or triple your crawlable URL space. Googl...
Gary Illyes Feb 03, 2026
★★★ Are your WordPress calendar parameters secretly destroying your crawl budget?
Calendar and event date parameters account for 5% of issues. Certain WordPress plugins create infinite calendar URL spaces on every path of your site, which prevents Google from detecting soft 404s an...
Gary Illyes Feb 03, 2026
★★★ Should you really block faceted navigation in robots.txt?
To control the crawling of faceted navigation, the most reasonable method is to use robots.txt to block these paths. Google's robots.txt file provides examples of parameter combinations to allow or bl...
Gary Illyes Feb 03, 2026
★★ Is Google really acting as a technical consultant for WordPress plugin developers?
Google's Search Relations team identifies WordPress plugins generating crawl problems and submits issues on their open source repositories. WooCommerce quickly resolved a reported problem concerning a...
Gary Illyes Feb 03, 2026
★★ Is double URL encoding silently killing your crawl budget?
Double percent encoding of URLs (encoding an already encoded URL) represents about 2% of issues. Google decodes URLs once, but if they have been encoded twice, the URLs remain incorrect and the site c...
Gary Illyes Feb 03, 2026
★★ Are short URL parameters really draining your crawl budget?
Irrelevant parameters (UTM, session IDs) make up 10% of reported issues. Google handles standard parameters well like session_id, j_session_id or utm_medium, but short non-standard parameters (like s=...
Gary Illyes Feb 03, 2026
★★ Should you really get rid of session IDs in your URLs?
Session IDs in URLs are an obsolete practice from the 2000s. Crawlers don't need to access session IDs because they don't maintain session persistence. These parameters can be blocked via robots.txt....
Gary Illyes Feb 03, 2026
★★★ Why does Googlebot need to crawl massive amounts of a new site before deciding if it's worth its attention?
Googlebot, despite nearly 30 years of experience, can only determine if a new URL space is relevant after crawling a large portion of it. During this phase, intensive crawling can render the site unus...
Gary Illyes Feb 03, 2026
★★ Should you replace GET parameters with PUT requests to protect your crawl budget?
It is very rare that Googlebot uses HTTP PUT requests. Using PUT requests instead of GET parameters for actions like adding to cart would help prevent these URLs from being crawled....
Gary Illyes Feb 03, 2026
★★ Do you really have to wait 24 hours for robots.txt changes to take effect with Google?
robots.txt files are cached by Google for a duration that can extend up to approximately 24 hours. Modifications made to robots.txt are therefore not immediate but remain the most sensible method for ...
Gary Illyes Feb 03, 2026
★★★ Why Are Your Pages Disappearing from Google with the 'Pages Indexed Without Content' Error?
John Mueller explains that the "Page Indexed without content" error in Search Console typically indicates a blockage at the server or CDN level, not a JavaScript issue. This is an urgent situation, as...
John Mueller Jan 13, 2026
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