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無料 llms.txt バリデーター

llms.txtファイルを仕様に照らして検証します。H1、ブロック引用、セクション、Markdownリンクをチェック。

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llms.txt バリデーターとは

llms.txt is a proposed standard file that helps large language models and AI tools discover and understand a website's key pages. It lives at /llms.txt and uses a simple Markdown-based format: an H1 title, an optional blockquote summary, sections with ## headings, and Markdown links to important pages. A validator checks that the file follows these structural rules.

クイックアンサー

Validate your llms.txt file to ensure it follows the specification: a required H1 title, optional blockquote summary, ## section headings, and absolute Markdown links. A well-formed llms.txt helps AI tools discover and understand your site's key pages efficiently.

制限事項

This validator checks structure and link format only. It does not verify that linked pages actually exist or return good content — use a link checker for that.
The llms.txt format has no official standards body (IETF, W3C) endorsement. The specification is community-driven and may evolve over time.
File size and link count warnings are advisory. There is no formal upper limit for llms.txt files, but shorter, curated files are more effective for AI consumption.

使い方

Paste your llms.txt file content into the text area.
The validator checks for a required H1 title, section headings, valid Markdown links, and relative URL issues.
Review the errors and warnings, fix the issues, and republish your llms.txt file.

主な用途

Validate an llms.txt file before publishing it at the site root.
Check that all links in an llms.txt use absolute URLs so AI tools can resolve them correctly.
Verify section structure and link count to ensure the file provides useful navigation for AI crawlers.

用途

使用例

例

Validate a newly created llms.txt

After generating an llms.txt with the site's llms.txt generator, paste it into the validator. The validator checks for a proper H1 title, warns about relative URLs, and confirms the section structure is correct before publishing.

例

Audit an existing llms.txt

A site's llms.txt has grown over several months and accumulated broken links. Paste the file into the validator and fix each broken or relative link it identifies before the next update.

よくあるミス

Using relative URLs like /tools/ instead of absolute URLs — AI tools reading the file may not know the base domain to resolve them against.
Forgetting the H1 heading at the top of the file — the H1 is required and tells the AI what the site or page collection is about.
Listing every single page instead of curating the most important entry points — an llms.txt should be a concise guide, not a complete sitemap.

検証

After fixing all errors and warnings, visit https://yoursite.com/llms.txt in a browser to confirm the file is served correctly.
Check that all absolute URLs in the file resolve correctly by clicking through a sample of links in the published file.

FAQ

llms.txt バリデーターのFAQ

What is the difference between llms.txt and sitemap.xml?

sitemap.xml is a machine-readable XML file designed for search engine crawlers to discover all indexable URLs. llms.txt is a human-readable and AI-readable Markdown file that highlights a site's most important pages, documentation, and policies. They serve different audiences: sitemap.xml is for search indexing; llms.txt is for AI understanding and discovery.

Does every page need to be in llms.txt?

No. llms.txt should list the most important entry points: homepage, documentation or tool indexes, category pages, sitemap, key policy pages, and high-value resources. Listing every individual page dilutes the signal and makes the file harder for AI tools to parse effectively.

What happens if my llms.txt has broken links?

AI tools that read llms.txt may follow the broken links and receive errors, which can reduce their confidence in the file as a reliable source. Broken links also waste crawl budget if AI crawlers attempt to fetch them. Validate regularly and fix broken links as part of your content maintenance routine.