Enter your domain
Use your main hostname. The checker fetches /llms.txt directly from your live site.
llms.txtChecker
Validate your llms.txt so AI assistants can read your site
H1 name
Summary
Sections
Linked resources
ReachableIs /llms.txt published?
StructuredTitle, summary, sections?
CompleteAre links described?
AI assistants use llms.txt to navigate your site. Check whether yours follows the convention — H1 name, summary, sections, and linked resources — in one step.
Free llms.txt Checker
Is your llms.txt ready for AI assistants?
Enter a domain. This checker reads its /llms.txt and validates it against the llms.txt convention, then shows a readiness score and what to fix.
Why llms.txt matters
A curated map assistants can actually read
llms.txt is a markdown file at /llms.txt that gives AI assistants a concise, structured guide to your most important pages. Instead of guessing your site's shape from raw HTML, an assistant can read your name, a one-line summary, and a short list of linked resources.
The convention is simple, but easy to get subtly wrong — a missing H1, no summary, or a flat list with no sections all make the file less useful. This checker validates each part in one step.
What a weak llms.txt costs you
- Assistants miss the pages you most want cited
- Your site gets summarized from guesswork, not your words
- Key products or docs never surface in answers
- Competitors with a clean llms.txt guide the assistant instead
How the llms.txt Checker works
Enter your domain and the checker reads your live /llms.txt, then validates it against the llms.txt convention.
Validate the structure
It checks the H1 name, blockquote summary, H2 sections, and markdown links with descriptions.
See your readiness score
Each check is marked pass, improve, or fix, with a plain-English reason — so you know what to change.
The checks that matter
What this checker validates
These are the parts of the llms.txt convention that make your file useful to AI assistants.
H1 — your site's name
Summary — a one-line blockquote
Sections — grouped “## ” headings
Links — markdown resource links
Descriptions — “: what it is” notes
Reachability — published at /llms.txt
validate your llms.txt for AI assistants
Get Started
A good llms.txt is a start, not the finish line
A valid llms.txt helps assistants navigate your site. Run the full AEOMaster audit to see whether AI answers actually find, mention, and cite your pages.
AI mentions
Citation gaps
Priority fixes
FAQs
Clear answers about AI mentions, AI citations, ChatGPT visibility, Perplexity citation readiness, and when a full audit is worth running.
What does the llms.txt checker do?
It fetches your site's /llms.txt and validates it against the llms.txt convention: a single H1 name, a one-line summary, H2 sections, and markdown links with descriptions. You get a readiness score and a checklist of what to fix.
What is llms.txt?
llms.txt is a proposed standard (llmstxt.org): a markdown file at /llms.txt that gives AI assistants a curated, easy-to-parse map of your most important pages, so they can ground answers in your content instead of guessing.
Does llms.txt help my AI visibility?
A well-structured llms.txt makes it easier for AI assistants to find and correctly summarize your key pages. It does not replace crawlable content, but it is a low-effort signal that helps assistants navigate your site.
What should my llms.txt include?
Start with an H1 that names your site, add a “> summary” blockquote, then group your key links under “## ” sections such as Docs, Guides, or Products — each link as “[Title](url): short description”. The checker flags anything missing.
Does a valid llms.txt guarantee I get cited?
No. A valid llms.txt only means assistants can navigate your site — whether they actually mention and cite you depends on your content, entity clarity, and third-party evidence. That is what the full AEOMaster audit measures.
How often should I check it?
Re-check whenever you restructure your site, add major sections, or change your llms.txt. It is a static file, so it can drift out of date without anyone noticing.
Beyond this tool
This checker validates the structure of your llms.txt. AEOMaster turns that into a full one-time audit of whether AI answers actually mention and cite you — with prioritized fixes.
Prompt-level results across ChatGPT, Claude, Perplexity, Gemini, and Google AI — not just file structure.
The sources AI answers cite, and the pages and citations you are missing.
Every finding ranked by expected impact and effort, so you know what to fix first.
Each issue comes with the why, the steps, and an example you can act on.
Re-run it after you ship fixes to confirm your structure and visibility improved.
From a valid llms.txt to AI citations
AEOMaster turns this structure check into a one-time AI visibility report: prompt-level findings, citation gaps, competitor context, and prioritized fixes you can re-run after each change.
$19.99 / one-time