15 mistakes that make your website invisible to ChatGPT and generative AI

Cyril Cretin
Founder RadarLLM.ai
78% of websites are invisible to AI. Here are the 15 most common mistakes and how to fix them.
1. Blocking GPTBot in robots.txt
CriticalMost hosting providers and security plugins block GPTBot by default. Check your robots.txt and add "User-agent: GPTBot / Allow: /".
2. Blocking ClaudeBot and PerplexityBot
CriticalSame issue as GPTBot. If you block these bots, Claude and Perplexity can't cite you. Allow anthropic-ai and PerplexityBot.
3. No llms.txt file
HighWithout llms.txt, AIs have to guess what your site does. Create an llms.txt file at your domain root describing your business.
4. No FAQ Schema JSON-LD
HighFAQPage schemas are the most citable format for AIs. Add structured Q&A in JSON-LD on your main pages.
5. Unstructured long content
HighAIs prefer short paragraphs (30-50 words) with questions in H2. A 3000-word article without structure is unusable by AI.
6. No author page
MediumEEAT requires an author page with bio, expertise and photo. Without an identified author, AIs consider your content less trustworthy.
7. No visible legal notices
MediumLegal notices, terms of service and privacy policy are trust signals. AIs check them to evaluate credibility.
8. No sitemap.xml
MediumThe sitemap helps robots (Google AND AI) discover all your pages. Without a sitemap, some pages remain invisible.
9. No hreflang tags for multilingual sites
MediumIf your site is available in multiple languages, hreflang tags prevent confusion between FR and EN versions.
10. Images without alt attribute
LowAIs can't "see" your images. The alt attribute describes the image for search engines and AI assistants.
11. No HTTPS
CriticalA site without HTTPS is considered untrustworthy by Google AND AIs. SSL certificate is free with Let's Encrypt.
12. Missing or too long meta description
MediumMeta description should be 150-160 characters and clearly summarize the page content. AIs use it to understand your page.
13. No Organization Schema
HighOrganization schema in JSON-LD tells AIs who you are: name, address, contact, logo. It's a fundamental EEAT signal.
14. Content without sources or references
MediumAIs prefer to cite content that itself cites sources. Add links to authoritative sources in your articles.
15. Never measuring AI visibility
HighYou can't improve what you don't measure. Use a tool like RadarLLM to know your score and track progress.
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