Crawl and indexing
llms.txt Validator
Paste your llms.txt and check its structure against the llmstxt.org format.
Runs in your browser; nothing is uploaded. · Free, no account · 2 min
Importing a saved run into your account is coming soon. Until then, your last runs stay in this browser only, and you can download your files.
How to use
- Open yoursite.com/llms.txt, copy its text and paste it into the box.
- Read the title, section and link counts.
- Fix errors first, such as a missing H1, then warnings such as relative links.
- Paste the corrected file again to confirm it passes.
What it checks and how it works
The validator checks the structure described at llmstxt.org: an optional byte-order mark, an H1 with the name of the site or project (the one required part), a blockquote summary, any Markdown except headings, then H2 sections that each hold a list of links written as [name](url) with an optional colon and note. The Optional section marks links an agent can skip.
It checks structure only. It does not open your links, and nothing in it can show that any AI assistant reads the file: the format is a proposal.
Sources
- llmstxt.org: The /llms.txt file opened 29 Oct 2026
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Questions
About this tool
Per llmstxt.org, only the H1 with the name of the site or project is required. The summary, notes and link sections are optional but recommended.
There is no evidence that it does. Validity means the file follows the proposed format. It does not mean any AI engine reads it.
An agent reading the file may not know which site it came from. Full URLs always resolve to the right page.
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