[SEO](/en/lab-categories/seo)Written on 14/4/2026Modified on 23/4/2026 # Crawl: how Google explores your site Definition Crawling is the zero step of SEO: before indexing a page, Google must first explore it via its Googlebot robot. In 2026, other robots join the picture: GPTBot, PerplexityBot, ClaudeBot. Each has its own access rules. If your site isn't crawlable, it's invisible, on Google and in AI alike. Table of contents[H2 Exemple](#)Share[ Copié](#)[](#)[](#)[](#)Summarize with AI[](#)[](#)[](#)[](#)Stop thinking about visibility. Build it. Your leads are already searching. The question is: will they find you? [Talk to an expert](/en/contact) ## What is SEO crawling? **Crawling** (or exploration) is the process by which a search engine robot discovers and analyzes a website's pages. For Google, this is primarily **Googlebot**: it follows hyperlinks, reads HTML, analyzes metadata and structured data, then passes this information to indexing systems. Without crawling, a page cannot be indexed and therefore cannot rank. It's the prerequisite for any organic visibility. ## Crawling in 2026: Googlebot is no longer alone In 2026, the landscape of crawling robots has expanded. Beyond Googlebot, your pages are potentially visited by **GPTBot** (OpenAI), **PerplexityBot**, **ClaudeBot** (Anthropic), and other AI robots. Each identifies itself with its own `User-Agent` and (normally) respects the `robots.txt`. Allowing or blocking these robots has direct consequences for your visibility in generative responses. Blocking GPTBot, for example, reduces the likelihood that ChatGPT cites your content in real time. Your `robots.txt` file has therefore become a **GEO strategy document**, not just a technical one. ## What we observe at Vydera on crawl obstacles The most common crawl errors we detect in audits aren't spectacular: they're silent. An overly broad `Disallow` in the robots.txt, a `noindex` tag accidentally applied to entire templates, an overly deep site architecture that exhausts the crawl budget before reaching the most important pages. The result: published pages, potentially well-written, but completely inactive in SEO. **A crawlability audit is always the first step in any serious technical audit.** ## Optimizing your site's crawl The most impactful actions: - Check your **robots.txt file** and ensure it isn't too restrictive, especially for AI robot User-Agents. - Submit an **up-to-date XML sitemap** in Google Search Console. - Fix **redirect chains** (301 to 301) that slow exploration. - Reduce **architecture depth**: strategic pages should be accessible in 3 clicks maximum from the homepage. - Remove or consolidate **low-value pages** that dilute the crawl budget. ## Sources and references - [Google Crawlers overview, Google Search Central](https://developers.google.com/search/docs/crawling-indexing/overview-google-crawlers) - [GPTBot documentation, OpenAI](https://platform.openai.com/docs/plugins/bot) ## Go further Crawlability is systematically audited in our technical engagements. If you want to know how your pages are being explored by Google and AI robots, [contact us](/en/contact). More resources on [Vydera Lab](/en/lab). - ## What's the difference between crawling and indexing? **Crawling** is the discovery step: the robot visits the page and analyzes its content. **Indexing** is the next step: the page is added to Google's index and becomes eligible for search results. A page can be crawled without being indexed (if it's noindex or if Google judges its content too thin). Conversely, a non-crawled page can never be indexed. - ## How do you check if a page is being properly crawled? Several methods: use the **URL Inspection tool in Google Search Console** to see if the page was recently crawled and what Googlebot rendered. Analyze your **server logs** to see which User-Agents visit your URLs. Also check the **Coverage report** in Search Console to detect excluded pages and reasons for non-indexing. - ## What is crawl budget? **Crawl budget** is the number of pages Googlebot is willing to explore on your site within a given timeframe. It depends on your site's authority and server response speed. If your site has thousands of low-value pages (filtered pages, duplicates, empty pages), the robot may exhaust its budget on these and never reach your important content. **Optimizing crawl budget means guiding the robot toward what matters.** - ## Do LLM robots (GPTBot, PerplexityBot) respect robots.txt? In theory, yes. OpenAI, Anthropic, Perplexity, and other major players officially declare they respect `robots.txt` directives. In practice, **you can finely control each robot's access** by adding specific rules per User-Agent in your robots.txt. Blocking GPTBot excludes your content from ChatGPT's RAG. Allowing all AI robots maximizes your chances of being cited in generative responses. To go further ## Related articles [![SEO vs GEO](https://cdn.prod.website-files.com/69d6632ce1a745225223d0b5/69df95a64e5b7fd189689014_seo-vs-geo.jpg)18/2/2026SEO ## SEO vs AEO: what actually changes (and what stays the same) AEO isn't a new SEO. It's an extension — but one that changes how you measure and build your visibility. Read article ](/en/lab/seo-vs-aeo-differences)[![Structured data SEO / AEO](https://cdn.prod.website-files.com/69d6632ce1a745225223d0b5/69df951118b139a23e178305_donnees-structurees-seo-geo.jpg)22/1/2026GEO & AEO ## Structured Data: Essential for SEO and AEO in 2026 Structured data is the technical foundation to exist in SEO and AEO. Read article ](/en/lab/structured-data-seo-aeo)[![SEO Comparison Pages: X vs Y](https://cdn.prod.website-files.com/69d6632ce1a745225223d0b5/69df9643aec71c5c58677c89_seo-pages-comparatif-x-vs-y%20(1).jpg)16/3/2026SEO ## Comparison Page SEO: How to Rank for "X vs Y" Queries "X vs Y" queries capture users at the decision stage. Here's how to structure and optimize your comparison pages to dominate them in SEO. Read article ](/en/lab/comparison-page-seo)Associated terms ## Discover other SEO, GEO, or AEO terms [SEO ### Indexing Indexing is the process by which Google adds a crawled page to its searchable database. An indexed page is eligible for search results. A non-indexed page is invisible. But indexing isn't automatic: Google decides based on content quality, uniqueness, and usefulness. Understand the term ](/en/glossary/indexing)[SEO ### Noindex The noindex directive is an instruction you give Google asking it not to include a page in its search results. It's not a defensive tool: it's a precision tool for protecting your site's overall quality and concentrating authority on pages that deserve to be seen. Understand the term ](/en/glossary/noindex)[SEO ### URL structure (SEO) URL structure is how you organize and formulate your web page addresses. A well-built URL is short, readable, descriptive, and contains the primary keyword. It's a minor SEO signal but a major user experience factor, and a structural error can be costly during migrations. Understand the term ](/en/glossary/url-structure-seo) ## Subscribe to our newsletter The best SEO & GEO insights every week. No spam, unsubscribe in one click. Thank you! Your subscription has been successfully confirmed.Oops! An error occurred while submitting the form.