---
title: "Introduction"
manual: "LLMs.txt Generator"
version: "main"
permalink: "https://docs.typo3.org/permalink/rtfirst/llms-txt:introduction@main"
source: "Introduction.rst"
rendered: "2026-10-02T09:37:21+00:00"
---

# Introduction {#introduction}

## What is llms.txt? {#what-is-llms-txt}

`llms.txt` is an emerging standard for providing AI and Large Language Model (LLM)
crawlers with structured information about a website. It serves as a machine-readable
index that helps AI systems understand your website's content and structure.

The [llmstxt.org specification](https://llmstxt.org/) defines how websites can
provide this information in a standardized format.

## Concept {#concept}

This extension provides a two-tier approach for LLM content access:

1.  **llms.txt Index File** \- One file per language containing:

    -   Website metadata (title, description, domain)
    -   Page structure with SEO descriptions and keywords
    -   Instructions for accessing full page content
1.  **Markdown Content Access** \- Access any page content via:

    -   `.md` suffix - Returns clean Markdown with YAML frontmatter
    -   Example: `/about.md` returns the "About" page as Markdown

## Multi-Language Support {#multi-language-support}

-   **One llms.txt per language** \- Every enabled language has its own
    llms.txt below its base, e.g. `https://example.com/en/llms.txt`, with the
    pages in this language and links to the llms.txt of the other languages.
-   **Language-specific content** \- Access any page in any language using the
    `.md` suffix with language URL prefix:

    -   Default: `https://example.com/about.md`
    -   English: `https://example.com/en/about.md`

## Features {#features}

### Core Features {#core-features}

-   **Automatic llms.txt generation** with smart caching
-   **Markdown output** for all content pages via `.md` URL suffix (can be
    disabled per site)
-   **Multi-language support**: one llms.txt per language, linked to each
    other
-   **API key protection** for restricted access
-   **YAML frontmatter** in Markdown output with page metadata

### Page-Level Control {#page-level-control}

-   **LLM tab** in page properties for fine-grained control
-   **Custom descriptions** and summaries per page
-   **Keywords** for better LLM understanding
-   **Priority setting** (0-100) for page ordering
-   **Exclude option** to hide specific pages from llms.txt

### Technical Features {#technical-features}

-   **24-hour caching** for optimal performance
-   **HTML-to-Markdown conversion** using League/html-to-markdown
-   **Clean output** \- removes scripts, styles, navigation elements
-   **UTF-8 BOM** in the Markdown output for proper encoding detection
-   **Backend notification** if robots.txt lacks llms.txt reference
-   **Header link injection** (`<link rel="alternate">`) in HTML pages

## Requirements {#requirements}

-   TYPO3 13.0 - 14.x
-   PHP 8.2 or higher

## Supported Content Elements {#supported-content-elements}

The extension converts the following TYPO3 content elements to Markdown:

-   **Header** (`header`)
-   **Text** (`text`)
-   **Text with Image** (`textpic`, `textmedia`)
-   **Image** (`image`)
-   **Bullet List** (`bullets`)
-   **Table** (`table`)
-   **HTML** (`html`)
-   **Menu** elements (`menu_*`)
-   All other elements via HTML-to-Markdown fallback