Alessandro Frank
CTO
What Is an LLM.txt – and Why Every Website Needs One
Artificial intelligence is transforming the way people discover and interact with brands online. But while search engines have long relied on sitemaps to understand websites, AI models like ChatGPT or Claude need something different: structured, concise context.
That’s where LLM.txt comes in.
What is an LLM.txt?
An LLM.txt file works like a sitemap — but instead of just URLs, it contains short AI-generated summaries of each page on your site.
Placed at the root of your domain (e.g., https://example.com/LLM.txt), it’s easily discoverable by AI crawlers, just like robots.txt or sitemap.xml.
This gives models like ChatGPT a much clearer understanding of your content and intent — which means your brand gets represented more accurately in AI-driven search and conversations.
Which AIs Already Use LLM.txt?
Several leading AI models and platforms are experimenting with or already leveraging LLM.txt as part of their crawling process:
- ChatGPT (OpenAI) → uses structured files to better interpret domains
- Claude (Anthropic) → prioritizes concise context for responses
- Emerging AI search tools → increasingly rely on standardized formats for summarization
The adoption is still growing — but the trend is clear: structured AI context will soon become a standard, just as sitemaps are today.
Why Every Website Needs an LLM.txt
The stakes are high: AI-driven search and assistants are quickly becoming the first point of contact between customers and brands. Without structured summaries, your website risks being misunderstood or misrepresented.
Key benefits of adding an LLM.txt file:
- Better representation in AI results: ensure your products, services, and messaging are accurately summarized.
- Higher brand visibility: AI search is growing fast — being well-prepared means staying ahead.
- Future-proofing: just as sitemaps became a necessity for SEO, LLM.txt will become critical for AI-optimized visibility.
How to Create Your LLM.txt
At Iridium Works, we built a free tool to make this easy: the LLM.txt Generator.
- Enter your domain (e.g., https://example.com)
- We crawl your sitemap and generate summaries for each page
- Download your ready-to-use LLM.txt file
- Upload it to your domain root (serve as text/plain)
- Re-generate it after major updates or on a regular cadence (e.g., monthly)
Conclusion
Search behavior is changing. AI is becoming the gateway to the web. Just as robots.txt and sitemap.xml shaped SEO in the past, LLM.txt will shape how your brand appears in the AI-driven web.
With the free LLM.txt Generator by Iridium Works, you can prepare your site today — and ensure your brand’s story is told the way you want it to be.
👉 Try it now: https://www.iridium-works.com/en/tools/llm-txt-generator
