llms.txt for Websites: What It Is and Why It Matters for AI Search

The way people discover information online is changing. Google remains essential, but AI systems such as ChatGPT, Gemini and Claude are becoming new gateways to brands, products and services.

For businesses, the question is no longer only “How do we rank on Google?” It is increasingly also “Can AI systems understand our website, our expertise and what we offer?”

That brings us to llms.txt.

Short answer: should your website have an llms.txt?

You can, but you don't need one for Google SEO or AI Overviews.

llms.txt is a proposed Markdown file designed to give Large Language Models (LLMs) a concise overview of a website and point them towards its most relevant content. It can be useful as an additional AI-readiness and context layer, but there is currently no established evidence that it improves Google rankings or guarantees visibility in ChatGPT, Gemini or other AI systems.

Google explicitly states that websites do not need llms.txt to appear in Google Search, AI Overviews or AI Mode. Traditional SEO best practices remain the foundation. Source: Google Search Central

So: llms.txt is optional, not essential.

What is llms.txt?

llms.txt is a proposal introduced by Jeremy Howard from Answer.AI in 2024. The idea is to create a file, usually located at:

https://example.com/llms.txt

The file uses Markdown to provide a curated description of a website and links to its most important resources. Source: llmstxt.org

Instead of making an AI system navigate hundreds of pages to understand a company, an llms.txt can provide a concise starting point.

It can contain:

• a description of the organisation;
• its main products or services;
• links to important pages;
• documentation and resources;
• additional context that helps explain the website.

The important word is curated. An llms.txt should not simply become another version of sitemap.xml.

llms.txt vs robots.txt vs sitemap.xml

These files have fundamentally different purposes

A robots.txt can tell crawlers what they should or should not access. A sitemap helps search engines discover URLs. Structured data can describe products, organisations, articles and other entities.

llms.txt, by contrast, is a proposed mechanism for providing a concise, human-readable layer of context to LLMs. Source: llmstxt.org

It should not replace any of the other three.

Does llms.txt improve SEO?

There is currently no evidence that adding llms.txt directly improves Google rankings.

Google's official guidance is particularly important here. Google says that publishers do not need to create special AI files such as llms.txt to appear in AI Overviews or AI Mode. Instead, websites should continue following established SEO fundamentals. Source: Google Search Central

That means your priorities should still include:

• useful and original content;
• strong technical SEO;
• crawlability and indexability;
• clear website architecture;
• internal linking;
• relevant structured data;
• authoritative and trustworthy information.

An llms.txt can therefore be considered an optional addition, rather than an SEO requirement.

Does llms.txt help with GEO?

Potentially, but llms.txt is only one small part of a broader GEO strategy.

Generative Engine Optimization (GEO) focuses on making a brand's content easier for AI-powered search and generative systems to understand, retrieve and reference. That involves much more than a single file: content quality, website structure, entities, authority, accessibility and clear factual information all play a role.

An llms.txt can provide an additional layer of curated context, particularly for websites with extensive documentation, products or technical information. However, it should not be treated as a GEO shortcut or a guarantee of visibility in AI-generated answers.

For a deeper explanation of how GEO differs from AEO, see our guide to AEO vs GEO.

The takeaway: build the content and technical foundations first. Treat llms.txt as an optional layer on top of them.

Who can benefit from llms.txt?

An llms.txt may be particularly useful for websites where context and information architecture are important.

SaaS and technology companies

Complex products often have extensive documentation, features, APIs and technical resources. A curated file can point towards the most important information.

B2B companies

Businesses with multiple services, industries and areas of expertise can use llms.txt to provide a concise overview of their positioning.

Documentation-heavy websites

Documentation was one of the key use cases behind the original proposal. Source: llmstxt.org

Businesses preparing for AI agents

AI is moving beyond answering questions. AI agents can increasingly search for information and interact with digital services.

Creating structured, accessible information today may therefore be useful as part of a broader AI-readiness strategy, even if llms.txt itself does not provide an immediate SEO benefit.

How to create an llms.txt

A basic implementation could look like this:

# Company Name

Brief description of the company and what it does.

## Products

- [Product A](URL): Short description.
- [Product B](URL): Short description.

## Services

- [Service A](URL): Short description.
- [Service B](URL): Short description.

## Resources

- [Guide](URL): Description.
- [Documentation](URL): Description.

Keep it concise. Prioritise your most important pages rather than listing every URL on the website.

llms.txt FAQ

Does llms.txt improve SEO?

No proven direct SEO benefit has been established. Google does not require llms.txt for Search, AI Overviews or AI Mode. Source: Google Search Central

Does Google use llms.txt?

Google's current guidance says websites do not need llms.txt for its AI search features.

Does ChatGPT read llms.txt?

There is no guarantee that ChatGPT or another AI system will use an llms.txt file. AI systems use different crawlers, retrieval systems and content sources.

For example, OpenAI documents its own web crawler controls through robots.txt. Source: OpenAI

Is llms.txt a replacement for robots.txt?

No. robots.txt and llms.txt serve different purposes.

Should every website create an llms.txt?

Not necessarily. It is most interesting for organisations with substantial, structured or technical content. For a small website, improving the existing content and technical SEO is likely to be a higher priority.

Does llms.txt help with GEO?

Potentially, but indirectly. It can provide an additional layer of context, but GEO depends on much more than a single file: content quality, authority, accessibility, entities, structure and relevance all matter.

The bottom line

llms.txt is worth understanding, but it should not become the centre of your AI search strategy.

Think of it as optional infrastructure for an AI-first web, not a shortcut to higher rankings or more mentions in ChatGPT.

The priority should be clear:

High-quality content → technical SEO → strong information architecture → authority and entities → GEO → optional AI-readiness layers such as llms.txt.

The important question is therefore not simply:

“Do we have an llms.txt?”

It is:

“If an AI system had to recommend our business today, would it have enough clear, authoritative and accessible information to do so?”

That is the question worth optimising for.

Sources

1. llms.txt — The /llms.txt fileThe original proposal, specification and rationale.llmstxt.org

2. Answer.AI — Introducing llms.txtBackground on the original proposal by Jeremy Howard.Answer.AI

3. Google Search Central — AI Features and Your WebsiteOfficial guidance for AI Overviews, AI Mode and website optimisation.Google Search Central

4. Google Search Central — Optimizing for Generative AI FeaturesGoogle's guidance on generative AI search and the role of existing SEO practices.Google Search Central

5. Google Search Central — Using Generative AI ContentGuidance on AI-generated content and search quality.Google Search Central

6. OpenAI — Web Crawler GuidanceInformation about OpenAI crawlers and robots.txt.OpenAI Help Center