LLMs.txt vs Robots.txt — What's the Difference?

Quick Comparison

	robots.txt	llms.txt
Purpose	Controls crawler access	Provides AI-readable context
Who it serves	Web crawlers (Googlebot, AI bots)	AI systems interpreting your site
File location	`/robots.txt`	`/llms.txt`
Format	Structured text directives	Human-readable markdown-ish text
Required?	Recommended for all sites	Emerging — not required
Standard?	Official web standard (RFC 9309)	Community-driven experiment
Can it block AI training?	Yes — blocks crawlers	No — it describes, not restricts
Can it help AI visibility?	Indirectly (clean crawl)	Directly (context for AI)

What Robots.txt Controls

robots.txt is an official standard (RFC 9309) that tells web crawlers what to crawl and what to skip. It is read by both search engine crawlers and AI crawlers.

User-agent: GPTBot
Disallow: /

Sitemap: https://example.com/sitemap.xml

Use robots.txt to block specific AI training crawlers you do not want accessing your site.

What LLMs.txt Provides

llms.txt is a human-written description of your website that AI systems can read to understand your site's purpose, audience, and key pages. It does not control access — it provides context.

# Example Site

> A platform that helps developers build and deploy APIs.

Website: https://example.com
Audience: Developers, API teams
Language: English

## Key Pages
- Docs: https://example.com/docs
  API documentation and quick-start guides.

Use llms.txt to help AI systems better understand and reference your content in generated responses.

Which Files Does My Site Need?

Answer these questions:

I want to control which AI crawlers access my site

I want AI systems to better understand my site

I want both — control crawlers AND provide AI context

You need both files. Use robots.txt to block unwanted AI training crawlers. Use llms.txt to give AI systems context about your site.

You need robots.txt. Use it to add crawler directives. You may also want llms.txt for AI context.

You need llms.txt. Add it to give AI systems context. Consider also adding robots.txt for crawler control.

Generate Robots.txt → Generate LLMs.txt →

Frequently Asked Questions

Do I need both llms.txt and robots.txt?

Yes. They serve completely different purposes. robots.txt controls crawler access. llms.txt provides AI-readable context about your site. They are complementary, not interchangeable.

Can llms.txt replace robots.txt?

No. robots.txt tells crawlers what to index or ignore. llms.txt tells AI systems what your site is about. You still need robots.txt for crawler control.

Should I block AI crawlers in robots.txt and add an llms.txt?

You can do both. Block training crawlers in robots.txt if you do not want your content used for AI training. Add an llms.txt file to provide context to AI systems that do read it.