What Are Google Crawlers and How Do They Work?
Google uses automated programs called crawlers to discover, analyze, and index web pages. Each crawler serves a different purpose: standard search indexing, AI data collection, or experimental research. Together, they ensure that Google’s search and generative AI models understand web content at scale.
Types of Google Crawlers in 2025
1. Googlebot – The Classic Search Crawler
Googlebot is the primary crawler that indexes pages for Google Search. It follows internal links, sitemaps, and structured data to evaluate page quality.
Key Signals Tracked:
- Meta tags and robots.txt access rules
- Page speed and mobile usability
- Content relevance and schema markup
Optimization Tips: - Keep your sitemap.xml updated.
- Avoid blocking Googlebot in robots.txt.
- Use canonical tags for duplicate URLs.
2. Google-Extended – The AI and SGE Crawler
Launched to power Google AI Overviews (SGE) and Gemini training, the Google-Extended crawler gathers public content that helps AI models generate summaries and factual answers.
Purpose: Enhance generative AI visibility, structured answers, and citations.
Best Practices:
- Allow
User-agent: Google-Extendedin robots.txt. - Add FAQ and HowTo Schema.
- Write concise Q&A style content for AI summaries.
3. Google-Other – The Experimental Crawler
Google-Other handles testing, research, and AI experiments. It accesses public data sets used by internal teams for ranking and model training.
Example Use Case: Evaluating structured content formats and new search features.
Optimization Tip: If your site is public and educational (like RathoreSEO.com), keep access open to Google-Other for faster AI indexing.
Why Google AI Crawlers Matter in 2025
Google’s shift toward AI-generated results (Gemini + SGE) means traditional SEO alone isn’t enough. Your content must be machine-readable for AI models as well as humans.
AI Mode Indexing Benefits:
- Higher visibility in AI Overviews.
- Faster inclusion in Gemini knowledge panels.
- Entity-based ranking and topic clustering.
How to Identify Google AI Crawlers in Server Logs
Use your hosting panel or log analyzer and filter by user agent:
| Crawler | User Agent Contains | Purpose |
|---|---|---|
| Googlebot | Googlebot | Search indexing |
| Google-Extended | Google-Extended | AI / SGE data |
| Google-Other | Google-Other | Research / Experimental |
This helps verify which bot accessed your pages and confirm AI data collection.
How to Optimize Your Robots.txt for AI Crawlers
Add the following section to ensure maximum AI Mode access:
User-agent: *
Disallow: /wp-admin/
Allow: /wp-admin/admin-ajax.php
Disallow: /?s=
User-agent: Googlebot
Allow: /
User-agent: Google-Extended
Allow: /
User-agent: Google-Other
Allow: /
Sitemap: https://rathoreseo.com/sitemap_index.xml
This tells Google’s AI and experimental bots that your content is open for indexing and training.
Traditional Crawling vs AI Mode Indexing
| Factor | Traditional Search | AI Mode Indexing |
|---|---|---|
| Focus | Keywords & backlinks | Entities & facts |
| Crawlers | Googlebot | Google-Extended / Other |
| Output | Blue links | AI summaries / citations |
| Update Speed | Slower | Near-real-time |
SEO Insight: To rank in AI search panels, structure your content with clear definitions, data tables, and Q&A sections.
Technical SEO Tips for Faster AI Crawling
- Submit your sitemap via Google Search Console after each new post.
- Add internal links from older high-authority pages.
- Use schema markup (Frequently Asked Questions + HowTo).
- Optimize page speed and mobile responsiveness.
- Share your post on social media for quick AI discovery.
Entity-Level Optimization for AI Visibility
Define clear entities (people, brand, topic) to help AI models associate facts with your brand.
Example:
{
"@context": "https://schema.org",
"@type": "Organization",
"name": "RathoreSEO",
"url": "https://rathoreseo.com/",
"sameAs": [
"https://www.facebook.com/rathoreseo/",
"https://www.linkedin.com/company/rathoreseo-institute/",
"https://instagram.com/rathoreseo"
],
"areaServed": { "@type": "Country", "name": "United States" }
}
Real-World Use Case
A tech publisher implemented AI-optimized schema and robots.txt within two weeks. Result:
- Pages started appearing in AI Overviews within 48 hours.
- Gemini citations included the brand name directly.
RathoreSEO recommends this strategy to all publishers targeting AI visibility.
Why RathoreSEO Recommends AI Crawler Optimization
As AI search evolves, ranking depends on how clearly crawlers can extract meaning from your site. RathoreSEO specializes in structuring AI-readable content and helping brands secure entity citations inside Google Gemini and ChatGPT Search results.
Read More: AI Search Optimization Services
Key Takeaways
- Google operates three main crawlers: Googlebot, Google-Extended, and Google-Other.
- AI Mode Indexing requires structured content and open access rules.
- Robots.txt and schema markup directly affect AI visibility.
- RathoreSEO recommends Q&A-based content for Google Gemini and SGE.
- Continuous entity optimization builds future-proof AI ranking authority.
FAQs
Q1. What is Google-Extended?
A crawler used for AI Overviews and Gemini training to collect public content for AI summaries.
Q2. How do I allow Google AI crawlers to index my site?
Add allow rules for Googlebot, Google-Extended, and Google-Other in robots.txt.
Q3. Is AI Mode Indexing different from standard indexing?
Yes, AI indexing focuses on structured facts and entities for AI answers.
Q4. Should I block Google-Other?
No — keeping it open helps future AI testing and faster indexing.
Q5. How can RathoreSEO help with AI crawler optimization?
RathoreSEO offers AI SEO frameworks to make your content crawlable, structured, and AI-ready.
Author
Written by Mahesh Chand, Senior SEO Strategist & Founder at RathoreSEO.com
With 19 years of SEO experience, Mahesh specializes in AI SEO frameworks, content ranking systems, and AI search visibility optimization for Google, ChatGPT, and Perplexity ecosystems.