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llms.txt Validator

Fetch origin /llms.txt, parse sections, and flag missing structure or absolute URLs.

Free · API · MCPToolYour platform

Use llms.txt Validator three ways

The free llms.txt Validator on this page works in your browser. The same workflow is available via REST API for apps and via MCP for Cursor, Claude, and other agents — one API key, one plan, one quota. This tool is part of the seo-apis module under Digital Tools.

  • Free in browserUse llms.txt Validator here — no account required.
  • REST APICall from your server with X-Api-Key.
  • MCP for agentsConnect Cursor or Claude to ToolYour MCP with the same key.
  • 1. Get an API keySign in and open Dashboard → API Keys (works for REST and MCP).
  • 2. Call or connectUse the REST API from your server, or paste the MCP URL into your agent config.
  • 3. Same qualityOutput matches the free web tool across all three surfaces.
Manage API keysMCP setupAPI referenceCreate free account

What is llms.txt Validator?

A missing, empty, or unstructured llms.txt wastes the work of publishing one. Agents look for skimmable headings and absolute links — not a wall of prose.

This validator resolves the site origin, fetches /llms.txt, and reports reachability, section headings, and whether absolute http(s) URLs appear. Pure fetch/parse — no generative model.

Use it after deploy, CDN cache changes, or when the builder stub goes live.

What are common questions about llms.txt Validator?

Where does it look for the file?

At the origin root: https://example.com/llms.txt.

What structure is expected?

A clear H1, a product synopsis (> blockquote or ## About prose), ## sections, and absolute https links. Markdown [Label](url) lists are preferred by llmstxt.org but bare URLs are accepted.

Does a pass mean agents will use my site?

No. It only confirms the file is reachable and usefully structured.

Are bare URLs a failure?

No. Absolute https URLs in lists/prose are valid. Missing markdown link syntax is a low-severity style note, not a hard fail.

Relative links?

Prefer absolute http(s) URLs so agents can resolve targets reliably.

What are the key features of llms.txt Validator?

Reachability

HTTP status and body presence for /llms.txt.

Section parse

Extracts # headings from the file.

URL inventory

Flags missing absolute links.

No LLM

Text parse only.

How do you use llms.txt Validator?

Paste any page on the site

Origin is derived from the URL host.

Review reachability and sections

Fix 404s, empty bodies, or flat files.

Add absolute URLs

Link docs, APIs, and key product pages.

Scope

Only the origin /llms.txt path. Subpath or CMS-generated discovery files elsewhere are not scanned.

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