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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★★★ Why will your hash (#) URLs never be indexed by Google?
URLs containing a hash (#) cannot be crawled or indexed by Google. For temporary content (e.g., sports match) to be findable in search before or during the event, clean routes without a hash must be u...
Martin Splitt Jul 01, 2020
★★ Should you really redirect Googlebot to www to bypass CORB errors?
It is technically acceptable to redirect only Googlebot to the www domain while keeping users on the non-www version to avoid CORB errors caused by a service worker. However, Martin recommends fixing ...
Martin Splitt Jul 01, 2020
★★★ Should you really hide consent banners from Googlebot to enhance its crawling?
It is technically acceptable not to show user consent pages to Googlebot and to load the main content directly, but this approach carries the risk of being detected as cloaking by Google's heuristics....
Martin Splitt Jul 01, 2020
★★ Is it true that Googlebot can do without pre-rendering?
In 90% of cases, pre-rendering is unnecessary for Googlebot because it executes JavaScript. If pre-rendering is used to work around a JavaScript issue, it is essential to ensure that any remaining Jav...
Martin Splitt Jul 01, 2020
★★ Why do link aggregators struggle to rank effectively?
Sites that primarily function as collections of links to other providers (for example, app or sports betting aggregators) may encounter ranking difficulties because Google’s algorithms may prefer to i...
John Mueller Jun 26, 2020
★★★ Why does Google filter certain pages in the SERPs despite full indexing?
If two pages would produce exactly the same snippet in the search results, Google will filter one out. The filtering depends on the query and the relevance of each site. The pages remain indexed; only...
John Mueller Jun 26, 2020
★★★ Do Search Console reports really reflect your indexing status?
Search Console aggregate reports (mobile-friendly, structured data, Core Web Vitals) only show a sample of the indexed pages, not the entirety. In extreme cases, this sample may be limited to a single...
John Mueller Jun 26, 2020
★★ Are category pages with product snippets really free from duplicate content penalties?
An indexed category page containing product snippets is not considered problematic duplicate content. Duplicate content is normal on the web and does not penalize a site. Google simply seeks to determ...
John Mueller Jun 26, 2020
★★ Should you really optimize geographic accessibility for Googlebot to crawl your site?
Google generally crawls from the United States. If a site is accessible only from the USA, Googlebot will be able to index it. However, restricting access for US users would also block Googlebot and p...
John Mueller Jun 26, 2020
★★★ Do URLs with parameters rank as well as clean URLs?
URLs with parameters (e.g., ?type=blog) rank exactly like URLs with clean paths. Parameters even facilitate crawling: Google's systems learn which parameters are critical and optimize exploration. For...
John Mueller Jun 26, 2020
★★ Should you really worry about the impact of 404 redirects on your crawl budget?
Switching from 404 to 301 or vice versa has no significant impact on the crawl budget. Google crawls 404s slightly less over time, but even for millions of pages, the difference is negligible....
John Mueller Jun 26, 2020
★★ Is a crawlable root page really necessary for a multilingual site?
For a multilingual site, having a crawlable root page is not mandatory. Redirecting the root domain (301) to the default language version (e.g., /en) is acceptable. Using hreflang with x-default for t...
John Mueller Jun 26, 2020
★★★ Does Google really index all the keywords on a page or is there selective filtering?
If Google indexes a page, it indexes its complete content with all its keywords. There is no system that indexes the content but ignores the keywords. If a page does not rank for certain competitive k...
John Mueller Jun 26, 2020
★★★ Should you completely block an e-commerce site during a temporary closure?
Completely blocking a site (for instance, displaying only 'closed due to COVID') leads to the rapid deindexing of all pages. In contrast, keeping the site active with only the cart deactivated allows ...
John Mueller Jun 26, 2020
★★ Is it true that your thousands of subdomains slow down Google’s crawling?
When a site uses thousands of subdomains, Google's crawling systems may take time to adapt because they are optimized by hostname. Initially, Google must determine whether all these subdomains share t...
John Mueller Jun 26, 2020
★★★ Does Googlebot really ignore cookie consent banners during indexing?
Google is capable of recognizing and ignoring legal banners such as cookie consents during indexing. If the banner is a CSS/JavaScript overlay on existing HTML content, Google can exclude it and index...
John Mueller Jun 26, 2020
★★★ Is it true that hidden CSS content is really indexed in a mobile-first manner?
With mobile-first indexing, Google only indexes the mobile version of a site, including for desktop searches. If a site uses responsive design where some desktop elements are hidden via CSS/JavaScript...
John Mueller Jun 26, 2020
★★ Why does Google sometimes show both HTML and AMP versions of the same page simultaneously in the SERPs?
Normally, if Google detects a valid AMP page for a URL and the user's browser supports it, the AMP version should be displayed in both the News carousel and mobile organic results. If both versions (H...
John Mueller Jun 26, 2020
★★ Can blocking CSS or JavaScript via robots.txt hurt your mobile ranking?
Blocking resources (CSS, JS, cookies, popups) via robots.txt is acceptable as long as Google can still render the page and assess its mobile compatibility. Blocking all CSS/JS would render the page un...
John Mueller Jun 26, 2020
★★★ How can you effectively organize sitemaps when managing thousands of subdomains?
To submit sitemaps covering thousands of subdomains, several options are available: via robots.txt (free location, including on dedicated external domains), via Search Console (the sitemap must then r...
John Mueller Jun 26, 2020
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