What Is llms.txt and Does Your Business Website Need One?

What is llms.txt?

llms.txt is a plain-text file placed at the root of your website (e.g., yoursite.com/llms.txt) that tells AI models and LLM-based crawlers which pages are most important, which to skip, and what your site is about. It is conceptually similar to robots.txt for traditional crawlers, but designed specifically for large language models.

The format was proposed in late 2024 and has been adopted by a growing number of AI-forward tools and documentation sites. It is not a Google standard — Google ignores it — but it is increasingly respected by Perplexity, Claude, and custom LLM crawlers built on top of open models.

What goes in an llms.txt file?

A basic llms.txt file includes a short description of your site, a list of your most important pages (in order of priority), and optional instructions about what the AI should and should not use. Here is a simple example for a local service business:

# MyBusiness

> A licensed roofing contractor serving the greater Atlanta metro area.

## Key Pages

- [Homepage](https://mybusiness.com): Overview of services and contact.
- [Services](https://mybusiness.com/services): Full list of roofing services.
- [About](https://mybusiness.com/about): Company history and team.
- [Reviews](https://mybusiness.com/reviews): Customer testimonials.

## Optional

- [Blog](https://mybusiness.com/blog): Industry guides and tips.

Does your business need one?

For most small local businesses, llms.txt is a low-priority nice-to-have today. The AI platforms that matter most for local visibility — Gemini, ChatGPT with Bing, and Apple Intelligence — don't currently use llms.txt as a primary signal. Your time is better spent on GBP, schema, and reviews first.

However, if you run a content-heavy site, a SaaS product, or a business that is actively trying to be indexed as an authoritative source by AI research tools like Perplexity, adding an llms.txt file is a 15-minute task that signals technical credibility and could help AI crawlers prioritize your best content. Think of it as planting a flag for the 2027 AI web, not a 2026 growth lever.