# llms.txt Validator

> A free, fast, modern online tool to validate llms.txt files against the llmstxt.org specification. Check any website's llms.txt for spec compliance, structure errors, broken links, and formatting issues.

The llms.txt Validator parses llms.txt files server-side, reports errors, warnings, and informational notes with line numbers, and shows the parsed structure (H1 project name, blockquote summary, H2 sections, and link list items).

## Tool

- [llms.txt Validator](https://llm-txt-validator.vercel.app): Enter a domain or full URL to validate its llms.txt file against the spec.

## Specification

- [llmstxt.org](https://llmstxt.org): The official llms.txt specification this validator implements.
- [llms.txt proposal](https://llmstxt.org/#format): Format definition — H1 project name, optional blockquote summary, H2 sections with markdown link lists.

## Features

- [Spec compliance checks](https://llm-txt-validator.vercel.app): Validates required H1, optional blockquote summary, H2 sections, and `[title](url): description` link list format.
- [Error reporting](https://llm-txt-validator.vercel.app): Reports errors, warnings, and info notes with line numbers.
- [Structure preview](https://llm-txt-validator.vercel.app): Shows the parsed H1, summary, sections, and links with clickable URLs.
- [Raw content view](https://llm-txt-validator.vercel.app): Inspect the fetched llms.txt content directly.

## Optional

- [robots.txt](https://llm-txt-validator.vercel.app/robots.txt): Crawler policy for this site.
- [sitemap.xml](https://llm-txt-validator.vercel.app/sitemap.xml): Sitemap for search engines.