llms.txt is a proposed plain-text file at the root of a website that gives AI systems a curated, Markdown-formatted map of the site’s most important content. In 2026 it does nothing for Google: Google’s own AI optimization guidance says it isn’t needed for AI Overviews or AI Mode. It may help AI agents navigate a site, it costs little to publish, and it is no substitute for clear pages and good internal links.
What llms.txt is
The format was proposed in 2024 as a way to help large language models find and read the most useful parts of a site without wading through navigation, scripts and ads. A typical file sits at yourdomain.com/llms.txt and contains:
- The site or project name as a heading.
- A short summary of what the site is.
- Sections listing key pages as Markdown links, each with a one-line description.
Some sites also publish llms-full.txt, with the full text of key pages in one file. Unlike robots.txt, it doesn’t control access; it is a suggestion of what to read.
What Google says
Google has been consistent. In a June 2026 Search Off the Record episode, John Mueller said LLM systems “can’t trust what is here as a way of differentiating” between sites, as Search Engine Journal reported; he has also compared llms.txt to the old keywords meta tag. Google’s generative AI optimization guide, published in May 2026, reportedly states that llms.txt is not needed for AI Overviews, AI Mode or other generative Search features, grouping it with other AI-specific tactics that don’t help, according to a Passionfruit summary of the guidance.
The logic is simple. Any site can claim in a file that its pages are the best. Search systems rank on evidence they can verify, such as content, links and user signals, not on self-description.
Who might actually use it
The picture outside Google Search is more mixed:
- AI agents and coding assistants: tools that browse a specific site to complete a task can use a curated map to find documentation faster. Mueller acknowledged this navigation use case in the same podcast.
- AI companies’ own docs: several AI companies publish llms.txt files for their developer documentation, which shows the format is used for docs, not that their consumer chatbots rank by it.
- Tooling: Chrome’s Lighthouse has added an agentic browsing audit that checks for the file, per the same Passionfruit summary.
What there isn’t, as of October 2026, is solid evidence that llms.txt increases citations in ChatGPT, Perplexity or Google’s AI features.
Should you create one?
| Site type | Recommendation |
|---|---|
| Software, APIs, developer documentation | Worth doing. Agents and coding assistants genuinely read docs. |
| Content sites, blogs, local businesses | Optional. Fine if your SEO plugin generates it automatically; don’t spend time on it. |
| Anyone expecting more Google AI citations | Don’t expect any. Google says it isn’t used. |
For transparency: ayonchy.com has one, because Rank Math generates it automatically. We don’t count on it for anything.
How to create one in two minutes
- If you use Rank Math, enable the llms.txt module; Yoast and other plugins offer similar options.
- Otherwise, create a plain-text file named
llms.txtin your site root. - Start with
# Site name, then a one-line summary as a quote (> ...). - Add sections such as
## Guidesand list your pillar pages as Markdown links with short descriptions. - Keep it to your most important pages and update it when they change.
What works better for AI visibility
The things that do move AI citations are the same things that help pages rank:
- Rank across the topic. Google AI Mode drew 93% of its citations from the organic top 10 in a 2026 benchmark; see why AI Mode cites only top-10 pages.
- Write answer-first, with specific facts AI systems can quote.
- Use clear HTML and internal links, which is exactly what Mueller pointed to for discovery. See semantic internal linking.
- Build entity consensus for ChatGPT through consistent brand facts and genuine mentions; see entity SEO.
If you are weighing AI-specific tactics in general, read is GEO just SEO? for where the extra work is worth it and where it isn’t.
Frequently asked questions
What is llms.txt?
llms.txt is a proposed plain-text file at a site’s root that lists its most important pages in Markdown, intended to help AI systems find and read key content.
Does Google use llms.txt?
No. Google has said llms.txt is not needed for AI Overviews, AI Mode or other generative Search features, and John Mueller has compared it to the keywords meta tag.
Does llms.txt help ChatGPT cite my site?
There is no solid evidence that it does as of October 2026. Consistent brand facts, genuine mentions and well-structured pages matter far more.
Is llms.txt the same as robots.txt?
No. robots.txt tells crawlers what they may access. llms.txt only suggests which content is most useful to read; it does not grant or block access.