llms.txt — do you need it and does it help with AI-Based website promotion?

Artificial intelligence is no longer just a trendy buzzword. Even today, the way users search for and receive information is changing. Whereas SEO specialists used to focus exclusively on search engines, AI systems like ChatGPT, Perplexity, and Gemini are increasingly becoming traffic sources.

These models analyze websites to provide users with concise answers and are gradually shaping their own search ecosystems. However, there is a fundamental challenge: limited context windows prevent language models from «digesting» large HTML pages packed with complex layouts, ads, and scripts. That is why SEO in the AI era is actively adapting to solve these problems. How to make your website’s information clear and compact for AI? The answer is the llms.txt file, proposed in 2024 by Jeremy Howard, co-founder of fast.ai.

We will talk about it in detail in our new article.

What is llms.txt?

llms.txt is a new standard file located in the website’s root directory (/llms.txt). It contains a brief description, links, and the structure of site resources in Markdown format, which is understandable to both humans and LLMs.

Essentially, llms.txt is a «mini-guide» to your website, created specifically for artificial intelligence.
It includes:

• a short site annotation;
• links to important pages (in the format [title](url): description);
• and optionally — supplementary materials that can be skipped during brief processing.

Appendix llms.txt:

Why do you need it?

The primary goal of llms.txt is to make your site content «AI-friendly».
Large language models struggle to efficiently process bulky HTML pages but work well with compact Markdown files.

llms.txt:

• provides structured navigation of your site,
• helps LLMs quickly locate the necessary data,
• reduces the risk of incorrect citations or distorted reinterpretations,
• facilitates the creation of AI assistants trained on your site’s documentation.

Additionally, each AI-relevant page can have a «clean» version — a Markdown file with the same URL but a .md extension (e.g., example.com/page.html.md).
This approach was first implemented in the FastHTML project, where all documents are available both as HTML and in a Markdown format readable by LLMs.

How is llms.txt different from robots.txt and sitemap.xml?

To avoid confusion, it’s important to understand the role of each file:

Thus, llms.txt does not replace robots.txt or sitemap.xml, but complements them.
If robots.txt says «what can be accessed», and sitemap.xml says «what exists», llms.txt explains «what is important and why».

How should llms.txt work?

The llms.txt file acts like a «map» or a «traffic light» for AI crawlers. Imagine your site as a big city and the AI as a tourist who needs to quickly find the best sights. llms.txt tells the AI where to go first, which places are especially important, and what to highlight.

The logic inside the file is as follows:

• Pages and sections with the highest priority come first, with a short description of their topic and importance.
• You can assign priority levels (e.g., homepage — level 1, blog — level 2, auxiliary sections — level 3).
• The AI crawler reads the file, matches the listed URLs against its database, and gives preference to those indicated in llms.txt when generating responses.

The file is strictly structured but remains simple and flexible.

Unlike XML or JSON, llms.txt uses Markdown because it:

• is easy to read by humans,
• is straightforward for LLMs to parse,
• is supported by standard tools (parsers, regular expressions, etc.).

Its structure and format allow AI to quickly find key content and cite your materials rather than others. More details about how to make AI cite your site can be found in our article.

Should you implement llms.txt? Experts’ experience and criticism

Introducing innovations into SEO always involves certain risks and uncertainties. As of now, llms.txt is still not an official standard, and its support and impact on ranking are not yet confirmed by AI systems.

Experience shows:

• The file does not directly affect traditional Google rankings. In fact, John Mueller recently confirmed that Google does not use llms.txt in its AI models.
• There is a risk the file and format become obsolete if the initiative fails to gain broad acceptance, so it’s important to monitor trends.

Should you implement llms.txt? The choice is yours. After all, it is an experimental format, so if you’re looking for additional opportunities, you can try it. However, even LLM models themselves have not yet confirmed that they rely on this file during site crawling.

How to implement llms.txt — Step-by-step guide

If you decide to try adding this file to your site, follow the sequence below:

1. Create a text file named llms.txt in your website’s root directory. It should be accessible at https://your-site/llms.txt.

2. Add key site sections, specifying their URLs and short descriptions. Prioritize pages that generate valuable traffic and conversions.

3. Check the file’s accessibility via browsers and webmaster tools. Make sure the file is not blocked and is read without errors.

4. Regularly update llms.txt when adding new important sections or changing the site’s structure.

5. Monitor the impact on indexing and AI behavior using analytics tools, including AI-focused SEO tools.

Instead of Conclusions

While llms.txt currently lacks definitive grounds and evidence to be considered a new standard, its implementation is a step toward adapting to new conditions.

Implementing llms.txt as an experiment may interest businesses actively working with content and aiming to optimize visibility in the AI environment. If you are interested in GEO promotion, we are ready to help. Our team closely follows all innovations in this field and assists websites in adapting to the new AI reality.

FAQ

1. Where should the llms.txt file be located on the site? The llms.txt file should be placed in the root directory of the site at https://example.com/llms.txt. This path (like robots.txt) is considered standard. For sites with subdomains or separate sections, local versions can be placed, e.g., https://blog.example.com/llms.txt. The key is that the file is accessible without authorization in plain text or Markdown format.

2. Can llms.txt help a website appear in ChatGPT or Perplexity answers? In general, yes, llms.txt can increase the chances of your site being cited in answers from ChatGPT, Perplexity, Bing Copilot, and other AI systems. These platforms increasingly rely on structured data sources to quickly find reliable information, and llms.txt provides structured info about your site.

3. How often should the llms.txt file be updated? It is recommended to update llms.txt whenever there are significant structural changes on the site. For active sites — once every 1–2 months; for stable ones — quarterly is sufficient. It is important to keep the file’s links always pointing to current and accessible pages.