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.
Quick SEO Quiz

Test your SEO knowledge in 5 questions

Less than a minute. Find out how much you really know about Google search.

🕒 ~1 min 🎯 5 questions
★★★ Why does Google sometimes ignore your rel=canonical tag?
Google does not guarantee indexing the URL indicated by rel=canonical. Canonicalization combines multiple signals: redirects, rel canonical, internal and external links, sitemaps, and other factors. I...
John Mueller May 29, 2020
★★★ Can you really display different content on mobile and desktop without facing penalties?
Google indexes the mobile version of the content. Displaying slightly different content between mobile and desktop is acceptable, unless it is malicious cloaking (e.g., comics on mobile, adult content...
John Mueller May 29, 2020
★★ Will Google introduce accelerated validation for your content overhauls in Search Console?
Google is considering extending the validation process for fixes in Search Console (currently limited to technical issues and structured data) to content overhauls. This would trigger expedited re-cra...
John Mueller May 29, 2020
★★ Is it really necessary to block social sharing URLs that generate 500 errors?
500 errors on internal URLs redirecting to external social networks do not pose a problem for Google. These URLs can be blocked by robots.txt to prevent their appearance in Search Console crawl errors...
John Mueller May 29, 2020
★★ How do you set up hreflang and x-default for geographic 301 redirects without losing indexing?
Redirecting users from one country to a different domain (with a canonical link to the main domain) is possible. Using hreflang with x-default for the redirect page helps Google understand the structu...
John Mueller May 29, 2020
★★ Why doesn't your homepage always show up first in a site: query?
For site: queries, Google has no defined order for displaying results. It's common but not guaranteed to see the homepage first. Its absence does not indicate a problem if the page normally ranks for ...
John Mueller May 29, 2020
★★★ Should you really worry about a low crawl rate?
A low crawl rate is not problematic if Google has already seen and indexed all the content. The crawl rate is neither an indicator of quality, demand, nor traffic. It has no direct impact on ranking o...
Martin Splitt May 27, 2020
★★★ Do JavaScript links really need to be <a> elements with href to be crawled?
For Google to follow links generated by JavaScript, they must be genuine <a> elements with a valid href attribute. Buttons, divs, spans with onclick, or <a> tags without href or with empty href are no...
Martin Splitt May 27, 2020
★★★ Is it really true that JavaScript-rendered content can be indexed by Google without any friction?
If the content appears in the 'Rendered HTML' tab of testing tools (Mobile-Friendly Test, Rich Results Test, URL Inspection Tool), it is correctly indexable by Google, even if it is not in the origina...
Martin Splitt May 27, 2020
★★★ Can Google really ignore part of your site without warning?
Google does not guarantee that it will crawl and index all pages of a site, nor the speed at which this will happen. Indexing does not mean that the page will be visible or useful in the results. Focu...
Martin Splitt May 27, 2020
★★★ Is dynamic rendering with expanded accordions considered cloaking by Google?
Serving Googlebot a version with expanded navigation accordions or without cookie banners via dynamic rendering is not considered cloaking, as long as the user is not misled about the main content. Th...
Martin Splitt May 27, 2020
★★★ Is the first wave / second wave model of JavaScript rendering still relevant?
The concept of 'first wave' and 'second wave' was a simplification to explain the crawling and rendering process. Google no longer uses it because it is misleading. The median time between crawling an...
Martin Splitt May 27, 2020
★★ Why does Googlebot still crawl using HTTP/1.1 instead of HTTP/2?
Googlebot still uses HTTP/1.1 for crawling. JavaScript optimization strategies must take this limitation into account, even though HTTP/2 offers multiplexing advantages for modern browsers....
Martin Splitt May 27, 2020
★★★ Should you stop using Google Cache to diagnose your indexing problems?
Google Cache is a fallback feature when a site is offline, created long ago and not actively maintained. It sometimes displays the original HTML, sometimes the rendering, and sometimes an old version....
Martin Splitt May 27, 2020
★★★ Should you really choose server-side rendering over dynamic rendering?
Google recommends server-side rendering over dynamic rendering because it creates faster sites for users. If implementation effort is required, it's better to favor the solution that also benefits use...
Martin Splitt May 27, 2020
★★★ Should you really optimize your site for mobile-first indexing?
About 70% of all search results are indexed through mobile-first indexing. Google was expected to switch all sites in September 2020, but this date could change due to COVID-19. Search Console indicat...
John Mueller May 26, 2020
★★★ Should You Create Your XML Sitemap Manually or Use an Automated Tool?
John Mueller explained on Reddit that, for large-scale websites, creating XML Sitemap files manually is not recommended, but rather using a tool (plugin or otherwise) from the CMS being used......
John Mueller May 25, 2020
★★★ Will Google Penalize Your Pages After Removing a Noindex Tag?
John Mueller explained on Twitter that a page that was initially deindexed via a meta robots "noindex" tag and then had this tag removed at a later time returns to a "normal" indexation situation afte...
John Mueller May 25, 2020
★★★ Should you block all UGC content from Google indexing by default?
To manage a large volume of user-generated content, Google recommends blocking these pages from indexing by default (via a noindex meta tag) and allowing them to be indexed only after validating their...
John Mueller May 19, 2020
★★★ Does Google really treat UGC just like your editorial content?
Google does not differentiate between content written by the site owner and that created by users (comments, discussions, complete pages). Any content published on a site is considered to be endorsed ...
John Mueller May 19, 2020
🔔

Get real-time analysis of the latest Google SEO declarations

Be the first to know every time a new official Google statement drops — with full expert analysis.

No spam. Unsubscribe in one click.