llms.txt is a website manual written for AI. It follows the llmstxt.org specification to describe your site's information to large language models.

Is my generated file data secure?

Both generation and validation run locally in your browser. Your file data never leaves the browser.

What does the validator score mean?

It is a structural quality score from 0–100 indicating how well the file is written. It does not mean AI will index your site, nor is it a ranking tactic.

Which file encodings does the validator support?

You can upload .txt files encoded in UTF-8, GBK, Big5, or GB2312.

How does the online checkup work?

After you enter a domain, the server requests /llms.txt from its root directory in real time and scores it using the local llms.js engine.

The online checkup feature is marked as free, and the entire project is open-sourced under the MIT license.

How do I deploy the generated llms.txt to my website?

The key requirement is making https://your-domain/llms.txt directly accessible as plain text. The tool provides detailed steps for WordPress, Vercel/Next.js/static sites, and self-hosted servers.

How many Chinese websites have deployed llms.txt so far?

According to a cetxt survey of 1,100 sites on 2026-10-04, 3.0% of large Chinese sites and 19% of independent sites have a genuine llms.txt file.

Which spec version does the validator follow?

It follows the llmstxt.org v2 (2026-08) specification.

October 9, 2026

cetxt

Marketing & Growth SEO and AI Search Optimization1

Use tool

An llms.txt generation, validation, and deployment assistant for Chinese webmasters

MIT

GEO优化 Site Audit

Product facts

Type: Web App / SaaS
Category: Marketing & Growth › SEO and AI Search Optimization
Pricing: Open source
License: MIT
Launched: Oct 9, 2026
Listed: Oct 9, 2026
Website: cetxt.com

Overview

GitHub

cetxt is a web tool for Chinese webmasters to generate, validate, and deploy llms.txt files compliant with the llmstxt.org v2 specification. Positioned as "a website manual for AI," llms.txt helps large language models better understand site structure. The tool includes three core modules: - **Generator**: Fill out a form (with templates for blogs, corporate sites, documentation sites, etc.), configure content line by line, and preview it in real time as a Markdown-formatted llms.txt file. Generation happens locally in the browser, so your data never leaves it. - **Validator**: Paste text or upload a .txt file (supports UTF-8, GBK, Big5, and GB2312 encodings). The engine runs 28 deterministic checks, returns a structural quality score from 0–100, and provides fix suggestions for each issue. The score reflects file structure quality only; it does not guarantee that AI will index your site. - **Online Checkup**: Enter a domain name, and the server fetches /llms.txt from the root directory in real time and scores it using the local engine. In addition, cetxt offers deployment guides for various environments, covering WordPress/shared hosting, Vercel/Next.js/static site generators (Hugo, Hexo), and self-hosted servers (NGiNX, Caddy), along with go-live steps and review checklists. The project is open-sourced under the MIT license and hosted on GitHub (yehyakin/llms-txt-cn). The team also published a survey report on llms.txt adoption across 1,100 Chinese websites, revealing that 3.0% of large sites and 19% of independent sites have a genuine llms.txt file.

Key features

Form Generator: Provides blog, corporate site, and documentation templates to generate llmstxt.org v2-compliant files by simply filling out a form
Live Preview: Renders your input into a Markdown-formatted llms.txt in real time as you type
Client-Side Generation: Files are generated locally in the browser, so your data never leaves it
Paste Validation: Paste llms.txt text to check its structure and links
File Upload Validation: Upload .txt files encoded in UTF-8, GBK, Big5, or GB2312 for validation
28 Deterministic Checks: Runs 28 rule checks based on the llmstxt.org v2 specification
0–100 Quality Score: Returns a structural quality score from 0 to 100 along with fix suggestions
Domain Online Checkup: Enter a domain and the server fetches /llms.txt in real time for local scoring
Multi-Platform Deployment Guides: Step-by-step instructions for WordPress, Vercel, Next.js, Hugo, Hexo, NGiNX, and more
Spec Quick Reference: Built-in explanations of MUST and SHOULD clauses from the llmstxt.org v2 spec
Site Survey Data: Publicly shares the methodology and findings from an llms.txt survey of 1,100 Chinese websites

Releases

Notify me

Initial · cetxt

October 9, 2026

Q&A

What is llms.txt?AI-generated: llms.txt is a website manual written for AI. It follows the llmstxt.org specification to describe your site's information to large language models.
Is my generated file data secure?AI-generated: Both generation and validation run locally in your browser. Your file data never leaves the browser.
What does the validator score mean?AI-generated: It is a structural quality score from 0–100 indicating how well the file is written. It does not mean AI will index your site, nor is it a ranking tactic.
Which file encodings does the validator support?AI-generated: You can upload .txt files encoded in UTF-8, GBK, Big5, or GB2312.
How does the online checkup work?AI-generated: After you enter a domain, the server requests /llms.txt from its root directory in real time and scores it using the local llms.js engine.
Is this tool free?AI-generated: The online checkup feature is marked as free, and the entire project is open-sourced under the MIT license.
How do I deploy the generated llms.txt to my website?AI-generated: The key requirement is making https://your-domain/llms.txt directly accessible as plain text. The tool provides detailed steps for WordPress, Vercel/Next.js/static sites, and self-hosted servers.
How many Chinese websites have deployed llms.txt so far?AI-generated: According to a cetxt survey of 1,100 sites on 2026-10-04, 3.0% of large Chinese sites and 19% of independent sites have a genuine llms.txt file.
Which spec version does the validator follow?AI-generated: It follows the llmstxt.org v2 (2026-08) specification.