llms.txt Explained: What It Is and How to Write One (With Examples)

llms.txt is a proposed convention: a Markdown file served at /llms.txt that gives large language models a concise, curated overview of a website — what it is and which pages matter.

Why it exists

HTML pages are full of navigation, scripts and layout. LLMs have limited context windows. A short, clean Markdown summary is far easier for an assistant (or an agent) to use at answer time.

The format

The structure is simple:

1. An # H1 with the project or product name (required).
2. A > blockquote with a one-sentence summary.
3. Optional paragraphs with more detail.
4. ## H2 sections containing Markdown link lists: - [Title](url): note.
5. An optional ## Optional section for less important links.

Example for a SaaS

# Acme Analytics
> Privacy-first web analytics for SaaS teams with revenue attribution.
## Key pages
- [Pricing](https://acme.com/pricing): Plans from $9/month
- [Docs](https://acme.com/docs): Install and API

Best practices

• Lead with a definitional sentence. It's the line most likely to be quoted.
• Include pricing and who it's for — the two things buyers ask most.
• Link to Markdown versions of pages if you have them.
• Keep it under a few hundred lines. Use llms-full.txt for the long version.

Ready? Generate your llms.txt — or see ours as a live example.