Free LLMs.txt Validator & Checker
Check your llms.txt file against the official spec. Get a compliance score, per-check explanations, and specific fix suggestions — free, instant, no login.
We'll look for yoursite.com/llms.txt automatically.
What we check — and why it matters
H1 Title
The first line must be a single `# Site Name`. AI models use this as the canonical identity for your site.
Blockquote Summary
A `> One-sentence tagline` immediately after the H1. This is what AI models show when citing your site.
H2 Sections + Links
Each section (## Heading) must contain at least one Markdown link. Empty sections confuse crawlers.
Description Paragraph
Plain text after the blockquote gives AI models narrative context about your audience and value prop.
Link Format
Links must follow `- [Title](url)` Markdown syntax. Malformed links are ignored by AI crawlers.
HTTPS Links Only
HTTP links may redirect or fail. AI crawlers expect clean canonical HTTPS URLs.
No Duplicate URLs
The same URL listed twice dilutes signal. Each page should appear exactly once.
No Query Strings
UTM parameters and other query strings create URL fragmentation. Use clean canonical paths.
File Size ≤ 10KB
The recommended ceiling. Larger files may be truncated or skipped entirely by AI crawlers.
10–50 Links
Too few links under-represent your site. Too many dilute attention. 10–50 is the goldilocks zone.
UTF-8 Encoding
The file must be UTF-8 encoded without a BOM. A BOM prefix can break parsers that read the file.
AI Crawler Access
We send real HEAD requests as GPTBot, ClaudeBot, PerplexityBot, and Meta-ExternalAgent to verify none are blocked by your server or WAF.
robots.txt Conflict
We fetch and parse your robots.txt to check if any AI crawlers are disallowed from / or /llms.txt — a valid file is useless if crawlers are blocked at the door.
Dead Links
We HEAD-request every URL listed in your llms.txt (up to 20) to find 404s, timeouts, and broken pages before AI crawlers do.
llms-full.txt Exists
If your file references an llms-full.txt URL, we verify the file actually exists and is reachable — many sites reference it but never create it.
How the compliance score works
Each check is weighted by importance. Critical structural checks count more than best-practice checks.
Frequently asked questions
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