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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
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. More resources on Vydera 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.txtdirectives. 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.
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