llms.txt is a markdown file published at the root of a website that gives large language models a short, curated map of the site. The specification at llmstxt.org defines its structure: an H1 with the project or site name, a blockquote summary, optional heading-free detail blocks, and H2 sections containing file lists of the form - [name](url): optional notes.

Where does the llms.txt file have to be located?

At the root of your domain, served at yourdomain.com/llms.txt. The specification also describes a companion file, /llms-full.txt, which holds the expanded content itself instead of an index of links. This checker looks for both when you validate by URL.

What does this llms.txt checker validate?

Five structural rules drawn from the specification: that the file is markdown using only H1 and H2 headings, that it opens with a single H1 project title, that a blockquote summary follows it, that any further detail blocks contain no headings, and that each H2 section contains a file list of link items. Each rule is weighted, and the total becomes a score out of 100 with a letter grade.

Is the blockquote summary required in llms.txt?

The H1 with the project name is the only section the specification marks as required. The blockquote summary is described as part of the expected structure and carries the key information needed to understand the rest of the file, so this checker treats a missing summary as a problem worth fixing rather than a hard failure of the format.

What does the Optional section mean in llms.txt?

A section named exactly Optional has special meaning in the specification: the URLs listed under it may be skipped when a shorter context is needed. Use it for secondary pages such as contact, legal and policy pages, and keep it as the last section in the file.

What is the difference between llms.txt and llms-full.txt?

llms.txt is a compact index — a title, a summary, and lists of links to the pages that matter. llms-full.txt is the companion convention that contains the full content itself in one file, for cases where a model should read the material rather than follow links to it.

Does llms.txt replace robots.txt or a sitemap?

No. robots.txt tells crawlers what they are allowed to fetch and a sitemap lists every indexable URL. llms.txt does neither — it is a curated summary that tells a language model which content is worth reading and how the site fits together. They serve different purposes and can all coexist at the site root.

Do I need an account to use this llms.txt checker?

No. The checker is free and requires no sign-up. You can validate a live URL or paste the contents of a draft file, and the results are returned to you without being published anywhere.

免费的 llms.txt 验证工具

llms.txt 检查器

根据官方 llmstxt.org 规范验证任何 llms.txt 文件

粘贴网址或原始内容，此检查器将模拟 AI 爬虫的方式进行解析——确认 Markdown 结构、必需的 H1 标题、引言摘要、详情区块以及每个 H2 文件列表，然后精准指出需要修改的行。

Free

No sign-up

Follows the llmstxt.org spec

URL or pasted content

什么是 llms.txt？

llms.txt is a markdown file published at the root of a website — yourdomain.com/llms.txt — that gives large language models a short, curated map of the site. Instead of asking a model to crawl navigation, scripts and boilerplate, the file hands it a title, a summary and a list of the pages that actually matter.

The format is defined by the specification at llmstxt.org. It is deliberately small: only H1 and H2 headings exist, and the body of each section is a list of links. That constraint is what makes the file both human-readable and trivially parseable by a program.

The spec also describes a companion convention, /llms-full.txt, which contains the expanded content itself rather than an index of links.

符合规范要求的顺序

1An optional byte-order mark at the very start of the file.
2An H1 with the name of the project or site — the only required section.
3A blockquote with a short summary containing the key information needed to understand the rest of the file.
4Zero or more markdown blocks — paragraphs, lists, tables — of any type except headings.
5Zero or more sections delimited by H2 headers, each containing a file list of `- [name](url)` items with optional `: notes`.
6A section named exactly “Optional” has special meaning: its URLs may be skipped when a shorter context is needed.

我们检查的 5 项验证规则

每一项检查都直接对应 llmstxt.org 规范中的一个条款。每个规则都会评分，加权后的总分即为您的合规得分和字母评级。

Markdown 格式

markdown-format

文件必须是 Markdown 格式，且其中只能包含 H1 和 H2 标题。

在 /llms.txt 提供纯 Markdown 内容——不得包含 HTML、YAML 前置元数据，也不得包含 H3–H6 标题。任何深于 H2 的标题均不符合规范。

H1 项目标题

h1-title

包含项目或网站名称的 H1 标题。这是唯一必需的部分。

以单行 `# 您的网站名称` 开始文件。这是规范中强制要求的部分，且必须且只能出现一次。

引用块摘要

blockquote-summary

一个包含项目简短摘要的引用块，其中包含理解其余内容所需的关键信息。

在 H1 下方直接放置一个 `> 单段落摘要`。说明网站的用途及其服务对象，以便 AI 模型能够理解其下方的每个链接。

无标题的详情块

project-details

零个或多个任意类型的 Markdown 部分（例如段落、列表、表格，但不能包含标题），其中包含更详细的信息。

在摘要后添加可选的上下文，可使用段落、列表或表格形式。此处请勿使用标题——文件中的下一个标题应当是您的第一个 H2 部分。

带有文件列表的 H2 部分

file-lists

由 H2 标题分隔的零个或多个 Markdown 部分，包含可获取更多详细信息的 URL 文件列表。

将链接分组到 `## 部分名称` 标题下，每行一个链接，格式为 `- [名称](https://绝对网址)：可选备注`。当需要更简短的上下文时，可以跳过名称恰好为 `Optional` 的部分，因此请将其放在最后。

如何编写符合规范的 llms.txt

实施指南

确保文件符合规范的六个关键决策。

1以一个 H1 开头. 使用您的网站或项目名称——除可选的字节顺序标记外，其上方不应有任何内容。这是规范要求的唯一部分。
2添加引用块摘要. 在 H1 下方直接写一个 `>` 段落，解释网站的用途，以便下方的链接具备上下文。
3保持详情块无标题. 摘要之后允许出现额外的段落、列表或表格——但在出现第一个 H2 之前不得使用任何标题。
4将链接分组到 H2 章节下. 根据模型会寻找的内容来命名章节：文档、指南、API、博客。此格式中仅存在 H1 和 H2。
5精确编写文件列表项. `- [页面名称](https://example.com/page): 简短说明`。请使用绝对 URL，以便模型在没有基础 URL 的情况下也能解析它们。
6将“可选”放在最后. 当需要更短的上下文时，可以跳过标题恰好为“可选”的章节。将其保留用于次要页面并放在末尾。

规范模板

发布在 llmstxt.org 上的标准示例 — 直接复制并填入您自己的内容。

# Title

> Optional description goes here

Optional details go here

## Section name

- [Link title](https://link_url): Optional link details

## Optional

- [Link title](https://link_url)

Save it as llms.txt and upload it to your site root so it is served at yourdomain.com/llms.txt, then run it back through this checker.

如何使用此检查器

1
Pick an input mode
tools.llmsTxtChecker.LlmsTxtCheckerPage.Choose Check by URL to validate a file that is already live, or Paste content to validate a draft before you publish it.
2
Enter your URL or file
tools.llmsTxtChecker.LlmsTxtCheckerPage.Type a bare domain, a site root, or a direct /llms.txt URL — the protocol is added for you. In paste mode, drop the full markdown into the text box.
3
Run the check
tools.llmsTxtChecker.LlmsTxtCheckerPage.Press Check or Validate. The file is fetched, split into specification blocks, and scored against the five structural rules.
4
Read the score and grade
tools.llmsTxtChecker.LlmsTxtCheckerPage.The score ring shows weighted compliance out of 100 with a letter grade, plus how many rules passed, warned, or failed.
5
Work through the findings
tools.llmsTxtChecker.LlmsTxtCheckerPage.Each finding names the rule, the line number, and the exact change to make. Expand a rule card to see every detail behind its status.
6
Fix, publish, and re-check
tools.llmsTxtChecker.LlmsTxtCheckerPage.Apply the fixes, upload the file to your site root so it is served at yourdomain.com/llms.txt, then run the URL back through the checker to confirm it passes.

llms.txt 检查器

什么是 llms.txt？

符合规范要求的顺序

我们检查的 5 项验证规则

Markdown 格式

H1 项目标题

引用块摘要

无标题的详情块

带有文件列表的 H2 部分

如何编写符合规范的 llms.txt

实施指南

规范模板

如何使用此检查器

Pick an input mode

Enter your URL or file

Run the check

Read the score and grade

Work through the findings

Fix, publish, and re-check

关于 llms.txt 的常见问题

相关工具

llms.txt Generator

robots.txt Generator

AXP & AI Agentic Checker

All free tools

什么是 llms.txt？

符合规范要求的顺序

我们检查的 5 项验证规则

Markdown 格式

H1 项目标题

引用块摘要

无标题的详情块

带有文件列表的 H2 部分

如何编写符合规范的 llms.txt

实施指南

规范模板

如何使用此检查器

Pick an input mode

Enter your URL or file

Run the check

Read the score and grade

Work through the findings

Fix, publish, and re-check

关于 llms.txt 的常见问题

What is llms.txt?

Where does the llms.txt file have to be located?

What does this llms.txt checker validate?

Is the blockquote summary required in llms.txt?

What does the Optional section mean in llms.txt?

What is the difference between llms.txt and llms-full.txt?

Does llms.txt replace robots.txt or a sitemap?

Do I need an account to use this llms.txt checker?

相关工具

llms.txt Generator

robots.txt Generator

AXP & AI Agentic Checker

All free tools