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llms.txt Validator

llms.txt Validator fetches /llms.txt, parses sections, and flags missing structure or links. Paste a site URL to check the origin file.

Waiting for bot check… this usually takes a second.

What next?

Keep going with llms.txt Validator

Finish this check in the browser, then pick the path that matches how you work — another related tool, REST for apps, or MCP for agents.

  1. 1. Related check

    After this result, run AI SEO checker for the next signal.

    AI SEO checker
  2. 2. Automate with API

    Same job from your server with X-Api-Key. Free tier includes 500 credits/month.

    Create free account
  3. 3. Hand off to an agent

    Connect Cursor or Claude to ToolYour MCP — plan → run → verify.

    MCP setup

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?

Does a pass mean agents will use my site?

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

Relative links?

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

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.

Where does it look for the file?

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

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.

What are the key features of llms.txt Validator?

Section parse

Extracts # headings from the file.

No LLM

Text parse only.

URL inventory

Flags missing absolute links.

Reachability

HTTP status and body presence for /llms.txt.

How do you use llms.txt Validator?

Add absolute URLs

Link docs, APIs, and key product pages.

Review reachability and sections

Fix 404s, empty bodies, or flat files.

Paste any page on the site

Origin is derived from the URL host.

Scope

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

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 the remote MCP server 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.

  1. 1Create a free accountGet an API key for REST and MCP — 500 credits/month on the free tier.
  2. 2Connect or callPaste the MCP URL into Cursor/Claude, or call REST with X-Api-Key.
  3. 3Same key & creditsBrowser smoke-checks stay free; API-backed runs share one monthly credit quota.
  • Free in browserUse llms.txt Validator here — no account required.
  • REST APICall from your server with X-Api-Key.
  • Remote MCP serverSame job from Cursor or Claude via the ToolYour remote MCP server — one API key with REST.
Create free accountRemote MCP setupAPI referenceManage API keysPricing

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