Free llms.txt Checker

What is llms.txt?

llms.txt is a proposed Markdown file at the root of a site (/llms.txt) that gives AI tools a short summary of the site and links to its most useful pages. Proposed in September 2024, it is not an official standard. Google does not use it for Search, and no major AI search product has confirmed relying on it.

How to use the llms.txt Checker

Enter your domain. The tool requests /llms.txt from the site root.
If the file exists, it checks that it starts with an H1 title and contains Markdown links.
Fix any format problem it reports, or use the llms.txt Generator to create a file.

How to read the results

Passed: An llms.txt file exists, starts with a “# Title” line and links to pages in Markdown.
Needs attention: The file exists but does not follow the llmstxt.org format (no H1 title or no links).
Not applicable: No llms.txt was found. This does not lower your score: the file is optional.

What goes in an llms.txt file?

An H1 with the site name, an optional one-paragraph summary in a blockquote, then H2 sections listing Markdown links to your key pages, each with a short note. Keep it short and point to pages that are useful on their own, such as docs, pricing and guides.

llms.txt

# Example Co.

> Example Co. makes accounting software for small businesses in Sri Lanka.

## Docs
- [Getting started](https://www.example.com/docs/start): set up your first company
- [API reference](https://www.example.com/docs/api): REST endpoints and limits

## Company
- [Pricing](https://www.example.com/pricing)
- [About](https://www.example.com/about)

Frequently asked questions

Does llms.txt improve rankings or AI citations?

There is no evidence that it does. Google has said it does not use llms.txt, and the major AI assistants have not documented using it. It costs little to add, so treat it as optional.

Is llms.txt the same as robots.txt?

No. robots.txt tells crawlers what they may fetch. llms.txt is a reading list; it grants or blocks nothing. To control AI crawlers, use robots.txt.

What is llms-full.txt?

A related convention: one file with the full text of your key pages in Markdown, so a tool can read everything in one request. It is equally unofficial.

Sources

What this tool checks

llms.txt file (informational)
Reports whether an /llms.txt file is present at the site root.
Why it matters: llms.txt is a proposed convention for pointing AI tools at your most useful content. It is optional and not an official standard, and it is not a guaranteed AI-ranking mechanism. This is an optimization/readiness signal only — it does not guarantee visibility in ChatGPT, Google AI Overviews or any other AI system.
If it fails: Optionally add an /llms.txt summarising your key pages. Treat it as a nice-to-have, not a requirement.
Source: llmstxt.org
llms.txt is well-formed
When an llms.txt file is present, checks it starts with an H1 title and contains markdown links to key pages, per the llmstxt.org convention.
Why it matters: A malformed llms.txt is unlikely to be parsed usefully by tools that read the convention. This is an optimization/readiness signal only — it does not guarantee visibility in ChatGPT, Google AI Overviews or any other AI system.
If it fails: Start the file with "# Site Name", optionally a blockquote summary, then "## Section" headings listing markdown links to key pages.
Source: llmstxt.org