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Free llms.txt Validator

Fetch /llms.txt or paste the file contents to see parsed sections, link counts, and validation issues.

  • 100% Free
  • Instant
  • No sign-up

Basics

What a valid llms.txt looks like

llms.txt is a markdown index that helps AI systems discover the pages you want cited.

  1. Plain text at /llms.txt

    Serve markdown (or plain text) at the domain root — not an HTML error page.

  2. Clear headings

    Use a strong H1 and logical H2 sections so parsers can skim topics.

  3. Curated links

    Link to the pages you want models to prefer — docs, pricing, glossary, policies.

  4. Human-readable summary

    A short positioning blurb helps agents understand what your brand does.

Do this

llms.txt validation tips

  1. Keep one canonical file

    Publish the primary file at example.com/llms.txt.

  2. Prefer absolute HTTPS links

    Absolute URLs survive crawler context switches better than relative paths.

  3. Update when IA changes

    Refresh sections when you add major docs or rename products.

  4. Pair with robots and ai.txt

    Allow crawlers in robots.txt and consider a companion /ai.txt policy file.

Avoid

Common llms.txt mistakes

  1. Returning HTML instead of text

    Soft-404 marketing pages break parsers — serve real text/markdown.

  2. Empty link lists

    A file with no links gives agents nowhere useful to go.

  3. Wall of uncommented prose

    Structure with headings; do not dump an entire blog into one blob.

  4. Blocking the file in robots

    If GPTBot cannot fetch /llms.txt, the file cannot help.

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llms.txt validator FAQ

No. Forever free on GetCited.me.
Both. Fetch the live file by URL, or paste a draft before you publish.
No — this validates. Use the llms.txt Generator if you need a draft from your site.
Markdown headings become sections. Comment-style lines may also be parsed as headings depending on format.
Generate or refine with the llms.txt Generator, add ai.txt, then check AI agent readiness on GetCited.me.

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