llms.txt Checker
Can ChatGPT, Perplexity, and Claude find you?
Chexter fetches /llms.txt, checks HTTP status, and validates the file structure per the llmstxt.org standard: # heading, > description, ## sections, and links. Also checks robots.txt mention.
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Methodology
How llms.txt Checker works
Is /llms.txt accessible at the domain root with HTTP 200?
The first line must be a Markdown H1 heading — the site/company name.
A blockquote description immediately after the title summarizes what the site is for AI.
Optional ## sections organize topics, tools, or docs that AI can explore.
Markdown-format links point AI to the most important pages and resources.
What llms.txt Checker checks
Why use Chexter llms.txt Checker
Frequently Asked Questions
What is llms.txt?
llms.txt is a file at the root of a website that structures information for AI systems (ChatGPT, Claude, Perplexity, Gemini) per the llmstxt.org standard, using Markdown format.
Is llms.txt required for SEO?
Not for traditional SEO, but it is increasingly important for AI visibility. Without llms.txt, AI systems may misinterpret your content or miss key information.
How does llms.txt differ from robots.txt?
robots.txt controls which crawlers can access pages. llms.txt provides structured information for AI to understand your site — it's a guide, not an access control file.
Which AI systems use llms.txt?
Perplexity, Claude, and other AI systems that support the llmstxt.org standard. ChatGPT support is expected to grow as the standard becomes more widely adopted.
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