LLMS.txt Checker

Enter a domain and we will check its llms.txt — does it exist, does it follow the llms.txt standard, do its links resolve — then suggest improvements.

llms.txt checker

Check your llms.txt against the standard

What is llms.txt?

llms.txt is a plain-markdown file at your site root that tells AI assistants — ChatGPT, Claude, Perplexity and the rest — where your best answers live. The llms.txt standard defines a simple shape: an # H1 title, a one-line > summary, then ## sections of links written as - [Name](url): description. A model reading it gets a curated index of your site instead of guessing from a crawl.

Should I create an llms.txt file?

Yes, if you care how AI assistants represent your business. It costs one small text file, and it is the difference between a model answering from your pricing page and answering from a stale third-party summary. If you don’t have one yet, the llms.txt generator will draft one from your sitemap in seconds.

What this llms.txt checker tests

That it exists at all — including catching the single-page-app trap where every path returns the app shell, so /llms.txt “exists” but serves HTML no model can use.

That it follows the llms.txt standard — one H1 title, a summary blockquote, links grouped under H2 sections in the - [Name](url): description format, absolute https URLs, no duplicates.

That the links work — we fetch a sample of the pages it lists and flag any that are dead. A broken link in llms.txt sends every AI assistant to a 404.

How to improve it — an AI review of your actual file, suggesting the high-value pages assistants look for: pricing, contact details, FAQs, opening hours.

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