Is llms.txt an official standard?

It is a community convention, not a formal W3C or IETF standard, and support varies by AI system. It is cheap to add and low-risk, which is why early movers adopt it — but treat it as one helpful signal, not a guaranteed instruction every engine obeys.

How is llms.txt different from robots.txt?

robots.txt controls whether crawlers are allowed to access paths. llms.txt does the opposite job: it points AI systems toward your most useful content in a clean, readable format. You want both — robots.txt to grant access, llms.txt to guide attention.

Where do I put llms.txt?

At the root of your domain, served as plain text at /llms.txt — the same convention as robots.txt. Some sites also publish an expanded /llms-full.txt with full content.

llms.txt: The Complete Guide for 2026

llms.txt is a plain-text file you place at the root of your domain (/llms.txt) that tells AI systems which content on your site is most worth reading. It’s a markdown-formatted index — a title, a short summary, and curated links — designed to be easy for a language model to parse. Think of it as a hand-built map for AI, where robots.txt is a set of gates.

It’s an emerging convention, not a formal standard, which is exactly why it’s a good early-mover play: few small sites have one, it’s cheap to add, and it’s one of the crawl-access signals our GEO Audit checks.

Why llms.txt matters for AI visibility

AI answer engines work better when they can quickly find the canonical, high-quality version of your content instead of crawling noise. A well-formed llms.txt does three things:

Surfaces your best pages so they’re more likely to be read and cited.
Provides a clean, low-token representation an LLM can parse without wading through navigation and markup.
Signals that the site is maintained and AI-aware — a small trust cue.

It does not replace good Generative Engine Optimization or structured data. It complements them.

llms.txt vs robots.txt

	robots.txt	llms.txt
Job	Allow/deny crawler access to paths	Point AI systems to your best content
Audience	All crawlers (search + AI)	AI systems specifically
Format	Directives (`User-agent`, `Disallow`)	Markdown (headings, summary, links)
Effect of omitting	Crawlers assume open access	AI gets no curated guidance

You want both: robots.txt to grant access (don’t block GPTBot, Google-Extended, ClaudeBot, PerplexityBot), and llms.txt to guide attention.

The anatomy of a good llms.txt

The convention is simple markdown:

An # H1 with your site or brand name.
A > blockquote one-paragraph summary of what the site is.
## sections grouping links, each as - [Title](url): one-line description.

A copy-paste template

# Your Brand

> One-paragraph summary of what your site does and who it helps. Be specific and factual — this is the description an AI system reads first.

## Core pages
- [Products](https://example.com/products): What you sell or offer.
- [Guides](https://example.com/blog): Your best how-to and reference content.
- [About](https://example.com/about): Who is behind the site and why to trust it.

## Key guides
- [Your best article](https://example.com/blog/best-article): What it answers.

## Notes
- Content is written to be quoted accurately by AI answer engines.

Keep links absolute, list your genuinely best content (not every page), and update it when you publish something significant.

How to validate it

After you publish /llms.txt, confirm it’s reachable as plain text (not HTML) and that it parses as structured markdown. Our GEO Audit probes for it automatically and reports whether it’s missing, present, or present-but-unstructured — so you can tell the difference between “no file” and “file that won’t help.”