Free tool

llms.txt Checker

Paste your existing /llms.txt and check it against the structural conventions AI engines actually expect: a title, a summary, sectioned pages, and working links.

Open yourdomain.com/llms.txt in a new tab and copy its contents below, this tool can't fetch it for you (browsers block cross-domain reads like that).

Why it matters

What a checker like this can and can't tell you

Structure is checkable, citation impact isn't, at least not from a file alone. This tool validates the shape of the file: title, summary, sections, links, HTTPS, length. It can't tell you whether ChatGPT or Claude will actually cite you more because of it.

Worth being direct about: our own testing across the 50 most-cited domains in our corpus found no measurable citation effect from having an llms.txt file versus not having one. That doesn't mean skip it, a well-structured file is still low-effort and can't hurt, but don't expect it to move citations on its own the way genuinely citable content does.

If you don't have an llms.txt yet, GetIntel's free llms.txt generator builds one from your actual site details, already in the structure this checker validates. For the difference between showing up in an AI answer and actually being cited as a source, see citations vs mentions.

FAQ

Frequently asked questions

No. This checker validates whatever text you paste in, it doesn't fetch a URL. Browsers block a page on getintel.ai from directly reading a file hosted on your domain (the same cross-origin restriction that stops any site from silently reading another site's pages). Open yourdomain.com/llms.txt in a new tab, copy its contents, and paste them in above.

Structure, not content quality: whether the file opens with a title, has a one-line summary, uses section headings, includes markdown links to key pages, uses HTTPS URLs, and keeps a reasonable length. It cannot judge whether your descriptions are accurate or persuasive, that part is still on you.

llms.txt is a community convention, not a formal W3C or IETF standard, so there's no single canonical validator. This checker applies the structural conventions used across the published examples and the generator format on this site: title, summary, sectioned headings, and linked key pages.

Use GetIntel's free llms.txt generator to build one from your actual site details, then paste the output back into this checker if you want a second structural pass, or just ship it as-is since the generator already follows the same conventions this checker looks for.
Your next move

A clean llms.txt is table stakes. Citations are the actual game.

GetIntel tracks ChatGPT, Perplexity, and Gemini daily (Claude weekly), surfaces the buyer prompts where competitors get cited and you don't, and turns each one into a ranked task with the content written for you.

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Your llms.txt is one file. Citations are the whole game.

GetIntel tracks whether AI engines actually cite you across ChatGPT, Perplexity, Gemini, and Google AI Overviews daily (plus Claude weekly), and turns every gap into a ranked task. $29/mo. 7-day free trial, card required.

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