---
title: "llms.txt validator | SEO Skill"
description: "Validate a published, pasted, or local llms.txt file. Find Markdown structure, section, link, and size problems without opening the URLs inside it."
canonical: "https://seoskill.dev/tools/llms-txt-validator"
language: "en"
---

# llms.txt validator

Enter a public llms.txt URL, paste the content, or open a local file. Get line-specific format and link-list checks.

## Validate an llms.txt file

Check a published file, paste its contents, or open one from your computer.

llms.txt content

Pasted text and local files stay in this browser tab.

**Valid**

Bytes

0

Lines

0

Sections

0

Links

0

## What the validator checks

The checker follows the current [llms.txt proposal](https://llmstxt.org/). It looks for one H1 project name, the optional blockquote summary, H2 file-list sections, complete HTTP or HTTPS links, duplicate links, and the special Optional section.

Errors include a line number when the problem belongs to one line. Suggestions cover valid but thin files, such as a title with no summary or useful links.

## A valid file does not prove the links work

When you enter a URL, this tool downloads that llms.txt file. It does not request the pages listed inside it, inspect their response headers, or confirm that an agent uses the file. Use the [published llms.txt audit](https://seoskill.dev/docs/reports/llms-txt-audit) when you need that live evidence.

## llms.txt is optional for AI search

The proposal gives systems that choose to read it a curated page list. Google says AI Overviews and AI Mode need no new machine-readable file or special AI markup. Pages still need the normal technical and content foundations used by Google Search.

Google's [AI features guidance](https://developers.google.com/search/docs/appearance/ai-features) covers the current requirements and controls. A clean validation result does not predict crawling, indexing, rankings, citations, or traffic.

## Create a cleaner draft

Fix a small file with the [llms.txt generator](https://seoskill.dev/tools/llms-txt-generator). It creates the same basic shape from links you choose and can import page URLs from a sitemap. For automatic selection from a site crawl, use the [crawl-driven generator](https://seoskill.dev/docs/reports/llms-txt-generator).