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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🕒 ~1 min 🎯 5 questions
★★★ Is it really time to move on from dynamic rendering for SEO?
Google is no longer actively recommending dynamic rendering (like Rendertron). It's a workaround, not a long-term solution. If JavaScript causes issues for Googlebot, it's likely causing issues for us...
Martin Splitt May 12, 2020
★★★ Is it really a good idea to inject the canonical tag through JavaScript?
Using JavaScript to inject the canonical tag into the head is perfectly acceptable, as long as it appears at the right place in the rendered DOM and points to the expected URL. Check with testing tool...
Martin Splitt May 12, 2020
★★ Shared or Dedicated Server: Does Google really make a difference?
The choice between a shared server and a dedicated server is of no importance to Google. Googlebot makes as many requests as necessary regardless of the hosting. A slow server-side (time to first byte...
Martin Splitt May 12, 2020
★★★ Are 301, 302, and JavaScript redirects really equivalent for SEO?
For Googlebot, there is no practical difference between a 301, 302, or client-side JavaScript redirect. Googlebot follows JavaScript redirects and treats them as normal redirects. There is no client-s...
Martin Splitt May 12, 2020
★★ 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
★★★ Does Googlebot really ignore your WebP images served through Service Workers?
Googlebot does not execute Service Workers. If a site uses a Service Worker to serve WebP images instead of JPEG/PNG, Googlebot will only see the original formats (JPEG/PNG), not the WebP. This does n...
Martin Splitt May 12, 2020
★★★ Can you really inject the canonical tag via JavaScript without risking your SEO?
It is acceptable to inject the canonical tag via JavaScript, even if the script is in the footer. The important thing is that in the rendered HTML, the canonical tag appears in the head and is the exp...
Martin Splitt May 12, 2020
★★ Does the JSON application state in the DOM create duplicate content?
During server-side rendering, if the application state is serialized as JSON in the page (for hydration) in addition to the rendered HTML, it does not pose a duplicate content issue. Google only looks...
Martin Splitt May 12, 2020
★★ Is SSR + client hydration really safe for Google SEO?
Frameworks with hydration (server-side rendering followed by client hydration, like Next.js/Nuxt) are acceptable. Even if some components only function on the client side, it’s not an issue as long as...
Martin Splitt May 12, 2020
★★★ Should you ditch dynamic rendering for better SEO results?
Google no longer actively recommends snapshot/dynamic rendering tools like Rendertron. It is a workaround, not a sustainable solution. If JavaScript is problematic for Googlebot, it likely is for user...
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
★★★ Is server-side rendering truly essential for Google SEO?
Server-side rendering (SSR) is not required for Googlebot as Google executes JavaScript and sees the content rendered on the client-side. However, SSR is highly recommended because it improves speed f...
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 serialized JSON in your JavaScript apps count as duplicate content?
During SSR, application state is often serialized in JSON on the page, which duplicates the content once in the JSON and once in the DOM. Google does not consider this problematic duplicate content be...
Martin Splitt May 12, 2020
★★ Does JavaScript really consume crawl budget?
There is no specific quota or budget for JavaScript rendering. The crawl budget only relates to HTTP requests (crawling), which include JavaScript and API files. Thanks to caching, the impact of JavaS...
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 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
★★ 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
★★ 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
★★★ 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
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