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Free llms.txt Validator - Check AI visibility files

Paste a domain to fetch /llms.txt. We check HTTP status, markdown H1, blockquote summary, sections, and https links so answer engines can actually use the file.

AI visibility

Validate an llms.txt file

Fetch /llms.txt and check for an H1, summary blockquote, sections, and https markdown links - the shape answer engines expect.

Fetches /llms.txt and checks H1, summary, sections, and links. Draft one with the llms.txt generator.

How to use

How to use llms.txt check

  1. 1

    Paste a public URL

    Domain or full URL. We request /llms.txt on that host.

  2. 2

    Read the checks

    Fails block agents. Warnings are shape hints, not hard errors.

  3. 3

    Fix and re-fetch

    Publish an updated file, then run the validator again.

Guide

What a useful llms.txt looks like

Start with # Product name, then a one-line > summary, then ## sections with [label](https://...) links to key pages.

Keep /llms.txt short. Put the long dump in /llms-full.txt if you need it.

After you generate a draft, publish it and re-run this checker. A 404 here is the most common miss.

Explore more on free ScrollLaunch tools, browse DR-ranked directories, or launch with a dofollow backlink.

Questions

llms.txt check FAQ

What does an llms.txt validator check?

HTTP status, markdown H1, optional blockquote summary, H2 sections, at least one https markdown link, and a 100KB size hint.

Can I generate a file first?

Yes - use the llms.txt generator, publish at /llms.txt, then re-check here.

Does this crawl the whole site?

No. It only fetches /llms.txt (or a URL that already ends in /llms.txt). Localhost and private IPs are blocked.

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