# LLMs.txt Validator

> A free web-based validator for llms.txt, llms-ctx.txt, and llms-full.txt files. Validates structure, links, encoding, and size against the official llmstxt.org specification.

## Tool

- [Validator](https://llmvalidator.io/#validator): Paste, upload, or fetch a file by URL to validate
- [Validate API](https://llmvalidator.io/validate): POST JSON with `content`, `url`, or `file_base64` to validate programmatically

## Pages

- [Home](https://llmvalidator.io/): Landing page with the validator tool
- [HTML Sitemap](https://llmvalidator.io/sitemap): Human-readable site map
- [XML Sitemap](https://llmvalidator.io/sitemap.xml): Machine-readable sitemap
- [Robots](https://llmvalidator.io/robots.txt): Crawler directives

## Sections

- [What is llms.txt](https://llmvalidator.io/#about): Overview of the specification
- [Features](https://llmvalidator.io/#features): Validator capabilities
- [Pricing](https://llmvalidator.io/#pricing): Plans and subscription tiers
- [FAQ](https://llmvalidator.io/#faq): Common questions about the validator and spec

## Reference

- [llms.txt specification](https://llmstxt.org/): Official spec for the llms.txt format