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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★★ 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
★★ 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
★★★ Is Googlebot still crawling your site with an outdated Chrome 41 user-agent?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
★★ 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
★★★ 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
★★★ 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
★★★ 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
★★★ 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
★★★ 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 deindex your pages and how can you fix it?
If the number of indexed pages decreases, it’s generally because Google believes it’s not worth indexing all pages individually. This could indicate a site-wide quality issue rather than a specific te...
John Mueller May 01, 2020
★★ How does Google handle the indexing of duplicate images across different websites?
Google tries to merge identical images found on different URLs into its index by establishing a single canonical URL, although differences in the content or metadata of the images can sometimes lead t...
John Mueller May 01, 2020
★★★ Does Google automatically remove indexed pages that are no longer needed?
Google does not automatically remove pages that are no longer relevant unless a 'noindex' tag is applied or if they are manually removed via the Search Console's removal tools....
John Mueller May 01, 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
★★ Should you really automate the generation of your XML sitemap?
Mueller strongly recommends automating the sitemap because every small change should reflect quickly. A sitemap generated by crawling your own site is acceptable but less optimal: Google will also cra...
John Mueller May 01, 2020
★★ Should you choose dashes or pluses in URLs for better SEO?
Using pluses (+) or dashes (-) in URLs has no impact on crawling or ranking. Dashes are preferred for technical convenience (to avoid spaces in tools), but both work identically for Google....
John Mueller May 01, 2020
★★★ Should you index the internal search pages of your site?
If internal search pages resemble categories, indexing them can make sense. If they consist of random user searches, it’s better to use noindex or robots.txt. Mueller prefers noindex because robots.tx...
John Mueller May 01, 2020
★★★ Should you really avoid canonicals pointing to page 1 on paginated pages?
If all paginated pages (2 to 10) have a canonical pointing to page 1, Google deindexes pages 2-10 and their unique content. Items that are only present on these pages will be lost to the index....
John Mueller May 01, 2020
★★★ Site Architecture: Is it really necessary to choose between flat and deep?
It's essential to avoid an architecture that's too flat (everything at the same level) or too deep (too many clicks). Finding a balance facilitates crawling, indexing, and ranking. There are no strict...
John Mueller May 01, 2020
★★ Should you really be concerned about internal PageRank on noindex pages?
On a normal e-commerce site, there’s no need to worry about the flow of PageRank between listed pages and noindex pages. Google systems handle this well. The major impact is on crawling (filtered URLs...
John Mueller May 01, 2020
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