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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★★ Is serving a 404 to Googlebot while showing a 200 to visitors really cloaking?
In a pre-rendered React SPA, serving an HTTP 404 code to Googlebot (via pre-render) while the user sees a 200 error page is generally not considered cloaking, unless you are doing something really dub...
Martin Splitt May 12, 2020
★★★ Is it true that Googlebot overlooks your WebP images served by Service Worker?
If you are using a Service Worker to serve WebP images instead of JPEG/PNG (by detecting browser support), Googlebot will not see the WebP because it does not execute Service Workers. Even if third-pa...
Martin Splitt May 12, 2020
★★ Does asynchronous JavaScript post-load really hinder Google indexing?
If part of the content (e.g., e-commerce product listings) is loaded asynchronously via JavaScript after the initial load, it’s not a problem as long as it loads quickly and shows correctly in the URL...
Martin Splitt May 12, 2020
★★★ Should you worry about 'Other Error' messages in Search Console and Mobile Friendly Test?
When Search Console or Mobile Friendly Test shows 'Other Error' for resources (JS, CSS), it's typically a limitation of the testing tool: limited quota, no cache, quick timeout. THIS IS NOT a real pro...
Martin Splitt May 12, 2020
★★★ Are JavaScript redirects truly equivalent to 301 redirects for Google?
There is no 301 redirect on the client side: the 301 code is a server HTTP status. However, you can create a client-side JavaScript redirect. Googlebot follows these redirects and treats them similarl...
Martin Splitt May 12, 2020
★★ Does Rendertron really eliminate all JavaScript from the generated HTML for bots?
Rendertron generates static HTML by executing the page via Puppeteer and then completely removing all JavaScript from the served HTML. Scripts like Google Analytics are executed during rendering but a...
Martin Splitt May 05, 2020
★★★ Is Googlebot still crawling your site with an outdated Chrome 41 user-agent?
Since April 2019, Googlebot Search no longer uses the Chrome 41 user-agent and has become evergreen. If requests with Chrome 41 appear in the logs, you must verify that they are genuinely coming from ...
Martin Splitt May 05, 2020
★★★ Are JavaScript redirects really as effective as 301s for SEO?
Google properly handles JavaScript redirects (window.location.href). They have no obvious disadvantage compared to server-side 301 redirects for Google Search, although they require the crawler to und...
Martin Splitt May 05, 2020
★★ Should you really fix every technical imperfection on a website that performs well in SEO?
If the content is indexed, appearing in search results and generating the expected clicks and impressions, nothing should be changed even if the technical setup seems imperfect. Only fix what is reall...
Martin Splitt May 05, 2020
★★★ Can renaming a URL parameter really force Google to reindex your duplicate pages?
When Google learns that a URL parameter is irrelevant and groups pages as duplicates, this learning persists for a long time. Changing the parameter name (e.g., from 'q=' to 'qu=' or 's=') forces Goog...
John Mueller May 05, 2020
★★ Can a 2.7 MB JavaScript bundle really pass through Google without issues?
A total JavaScript bundle size of 2.7 MB does not pose a major problem for Google indexing. It is only from 10 MB that it becomes truly problematic. Optimization remains recommended for user experienc...
Martin Splitt May 05, 2020
★★★ Are JavaScript links really crawlable by Google if the code is clean?
Client-side generated links with JavaScript are crawlable by Google as long as they are <a> tags with an href attribute containing a crawlable URL. Client-side rendering is not an issue as long as the...
Martin Splitt May 05, 2020
★★ Should you really abandon dynamic rendering for JavaScript indexing?
Dynamic rendering via Rendertron or others is a workaround that adds complexity and should be used only when absolutely necessary. For canonicalization or parameter issues, other solutions like renami...
Martin Splitt May 05, 2020
★★ Why do your structured data intermittently vanish from Search Console?
The intermittent appearance and disappearance of JavaScript-generated structured data in the Search Console Enhancements report may be related to temporary rendering issues or the timing of when Googl...
Martin Splitt May 05, 2020
★★★ Should you overlook timeout errors from the Mobile-Friendly Test?
Testing tools like the Mobile-Friendly Test can show 'other errors' and timeouts more easily than Google's actual indexing infrastructure, which is much more patient. These errors in the tools do not ...
Martin Splitt May 05, 2020
★★★ How Long Before Google Deindexes a Site That's Down?
John Mueller explained on Twitter that if a website is "down" due to an outage, the search engine will test access to its pages a certain number of times, then begin deindexing content (page by page a...
John Mueller May 04, 2020
★★★ Does Googlebot Still Fill Out Forms to Crawl Your Website?
John Mueller explained in a hangout that today, it is extremely rare for Googlebot to attempt to fill out and submit a form on a website "to see where it goes in that case". John explained that if thi...
John Mueller May 04, 2020
★★★ Why Does Google Detect So Many Soft 404s in Search Console and How Can You Fix Them?
John Mueller explained on Twitter that if, in the Search Console ("Coverage" report), you have many "Soft 404s" (pages generating a 200 code but with 404 behavior), it's because you may have an intern...
John Mueller May 04, 2020
★★★ Can content A/B testing really harm your SEO without you knowing?
Temporarily changing content (e.g., H1) will be indexed by Google if crawled, with potential SEO impact. Testing every two weeks makes tracking very difficult because the timing of reprocessing is unp...
John Mueller May 01, 2020
★★★ Why does Google deindex your blog articles after an update?
When previously indexed articles are deindexed after an algorithm update, it is usually not a technical issue but a problem of perceived quality. Google decides that indexing fewer pages from this sec...
John Mueller May 01, 2020
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