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llms.txt

llms.txt is a plain-text file placed in a website's root directory that gives AI systems a Markdown map of the site's most important pages and rules. Think of it as a robots.txt written for large language models instead of search crawlers.

What it is

llms.txt is a proposed standard. The file lists your highest-value pages and key facts in a clean, machine-readable format, so an AI system can find the right content without wading through your whole site. It does not replace your XML sitemap and it does not change how Google indexes you.

Why it matters

As of 2026, the major AI providers have not formally committed to reading llms.txt in production, so treat it as a low-cost bet rather than a guarantee. Adoption is strongest in developer tooling, where AI coding assistants use it to pull the right docs with less waste. It is cheap to add and positions you well if support grows.

What to do

Create an llms.txt file at your root that links your most important pages with short descriptions. Keep it current. Pair it with valid schema, which carries more weight today than the file does on its own.

Frequently asked questions

Some developer tools do. As of 2026, the major AI search providers have not publicly committed to using it in production. It is a low-cost, forward-looking step, not a guaranteed ranking factor.
They are similar in spirit. robots.txt guides search engine crawlers. llms.txt is a content map written for large language models.
At your site root, usually yourdomain.com/llms.txt. It lists your most important pages and key facts in clean Markdown so AI systems can find them without crawling everything.

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