AI search fix
How to validate your llms.txt file
Validate llms.txt by fetching https://yourdomain.com/llms.txt over HTTPS, confirming a 200 response, readable markdown, working links, and an Updated date that matches your last deploy. Third-party validators can help spot syntax issues, but they cannot prove ChatGPT or Perplexity will cite you. Pair file checks with robots.txt and WAF rules so AI crawlers can still reach the URLs you list.
A valid llms.txt file that points to blocked pages adds little value. Run the same crawl checks you would for any GEO page before treating validation as complete.
llms.txt validation checklist
- Open /llms.txt in a browser — expect 200, not 404 or a login wall.
- Confirm H1, blockquote summary, and at least one linked section.
- Click sample links; fix broken paths or redirects to unrelated hosts.
- Compare the Updated line to your last content or pricing change.
- Re-check robots.txt and CDN rules if crawlers still cannot fetch listed URLs.
You'll get an HTML report on llms.txt presence, link reachability signals, and AI crawler blocks.
Run Express CheckRelated questions
Updated