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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★★ Should You Really Aim for 100ms Download Times to Optimize Google's Crawl?
John Mueller explained on Twitter that an interesting metric, in terms of page load times, could be to look at the Search Console, in the "Crawl > Crawl Stats" section, and then try to have the "Time ...
John Mueller Sep 17, 2018
★★★ Should You Structure Your XML Sitemaps Differently Based on How You Submit Them to Google?
John Mueller explained during a hangout that if an XML Sitemap file was submitted via an anonymous ping, the URLs it contained had to be present in the directory (and subdirectories) of the Sitemap fi...
John Mueller Sep 17, 2018
★★★ Does JavaScript really delay the indexing of your content?
If content is displayed only via JavaScript and takes time to load, it can delay its indexing. For sites with dynamic content, this means that new items may not be indexed immediately, which could be ...
John Mueller Sep 13, 2018
★★★ Does mobile-first indexing really eliminate all content that's not accessible on mobile?
During the transition to mobile-first indexing, Google will use only the mobile version of a site for indexing and ranking. Therefore, it's crucial that relevant content is present on the mobile versi...
John Mueller Sep 13, 2018
★★★ Can mobile-first indexing really hurt your rankings?
Shifting a site to mobile-first indexing shouldn't negatively impact its rankings if the site is responsive and properly utilizes technologies like CSS and JavaScript for mobile access....
John Mueller Sep 13, 2018
★★★ Should you really worry about 404 errors in Search Console?
URLs that return a 404 status are normal, and Google gradually removes them from the index. Having 404 errors in Search Console is not problematic, and they will disappear over time....
John Mueller Sep 13, 2018
★★★ Should you inject your canonical tags via Google Tag Manager?
Using Google Tag Manager to inject a canonical tag into HTML pages can be problematic because only Google will process it. This can lead to latency between the time the HTML version is indexed and the...
John Mueller Sep 13, 2018
★★ Why does Google sometimes show the original publish date instead of the update date?
Google may sometimes show the original publish date instead of the modification date based on what is deemed most relevant to the user. The algorithms can choose between these dates depending on the c...
John Mueller Sep 13, 2018
★★★ Should you really leave thousands of hacked URLs resulting in 404 errors after an attack?
In case of a hack leading to the creation of many fake URLs, it is normal to see 404 errors in Search Console. It is recommended to ensure that the unwanted URLs return a 404 status so that Google pro...
John Mueller Sep 13, 2018
★★★ Why does Google block some sites from desktop indexing despite mobile-first indexing?
Google will only move a site to mobile-first indexing if it is satisfied with the content parity between the desktop and mobile versions. If the mobile version has significantly less content, images, ...
John Mueller Sep 13, 2018
★★★ Does Google really adjust its crawling when your server is slow?
If Google detects that the server is overloaded, it will reduce the amount of crawling to avoid causing issues. This can slow down indexing, particularly when adding new AMP pages....
John Mueller Sep 13, 2018
★★★ Should you really self-manage canonicals on a multilingual site?
For international sites, use the hreflang tag without altering the canonicals. Each version of a page should point to itself while hreflang tags link the pages together, tailored to their specific aud...
John Mueller Sep 13, 2018
★★★ Can JavaScript Actually Prevent Your Site from Being Indexed in Mobile First?
John Mueller explained during a hangout that sites using a lot of JavaScript might not be transitioned to the Mobile First index....
John Mueller Sep 10, 2018
★★★ How Does Google Really Index PDF Files and Why Should This Change Your SEO Strategy?
John Mueller indicated on Twitter that when indexing PDF documents or others (certainly Word, Excel, PowerPoint or others), it first goes through a conversion phase from PDF to HTML. And it's this doc...
John Mueller Sep 03, 2018
★★★ Should You Really Exclude All Redirected URLs from Your XML Sitemap?
John Mueller has said it repeatedly in the past: when you create your XML Sitemap files, don't include any redirected URLs (301 or otherwise). He reiterated this on Twitter recently. Google uses this ...
John Mueller Sep 03, 2018
★★★ Does lazy loading of images really harm your Google indexing?
Google recommends that images be easily accessible, even with lazy loading, through the <noscript> tag or structured data to ensure their correct indexing....
John Mueller Aug 24, 2018
★★★ Is duplicate content really harmless for your SEO?
Technical duplicate content is not penalized as long as it is in a technical form. Google tries to index the best URL when the same content is available on multiple pages....
John Mueller Aug 24, 2018
★★★ Could the overall quality of your site be hurting your top pages?
Google attempts to rank pages individually, but the overall quality of the site can affect how they are indexed. A gradual improvement of the entire site is recommended for better long-term results....
John Mueller Aug 24, 2018
★★ Should you really remove empty sitemaps from your site?
Submitting sitemap files without URLs is not problematic but not optimal. It is advisable to remove these sitemaps during a code review....
John Mueller Aug 24, 2018
★★★ Why could your HTTPS migration disrupt your Google indexing?
HTTPS migrations are independent of algorithm updates. They must be performed properly with clear 301 redirects page by page to avoid indexing fluctuations....
John Mueller Aug 24, 2018
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