# Do I need an llms.txt file?

**Short answer:** no — it is not required, and no major AI provider has confirmed that it is a ranking or citation factor. But it costs about an hour, carry minimal risk, and gives AI crawlers and agents a single, unambiguous description of your brand, products and key pages. For most company sites, that trade is worth taking.

## What llms.txt actually is

`llms.txt` is a proposed convention: a plain-text Markdown file at `/llms.txt` that summarizes a site for large language models. It typically contains a short brand description, product facts, and an annotated list of important URLs.

It is not a standard in the formal sense. It is a community proposal with growing adoption, not a specification enforced by OpenAI, Anthropic, Google or Perplexity.

## What it does not do

- It does **not** replace `robots.txt`. Crawl permissions are governed by `robots.txt`.
- It does **not** replace `sitemap.xml`. Discovery is governed by sitemaps, links and crawl history.
- It does **not** guarantee citations. Models cite pages whose content they retrieved and found relevant.
- It does **not** override what your pages say. If `llms.txt` claims one price and your pricing page says another, the inconsistency is the problem.

## Why it is still worth publishing

**One canonical fact sheet.** Most sites describe themselves in five inconsistent places: homepage hero, meta description, about page, pricing page and footer. `llms.txt` forces a single authoritative version. When AI answers misstate your pricing or scope, having a precise source is the first step to correcting it.

**Crawl guidance for agents.** Tools and agents that do read it get a curated list of the pages that matter, instead of guessing from navigation.

**Cheap differentiation.** In categories where competitors have no `llms.txt`, publishing one is a visible signal of machine-readiness — and a legitimate talking point in GEO content.

**Low downside.** It is a static text file. It does not affect classic SEO performance. The main risk is publishing wrong facts, which is a content problem you can fix.

## When you should skip it

- You cannot keep it accurate. A stale fact sheet is worse than none.
- Your site is behind a strict CDN/WAF and the file would be blocked anyway — fix access first.
- Your content is entirely behind a paywall or login. There is nothing for crawlers to read.

## Minimum viable content

A useful `llms.txt` is short. Start with:

```
# Brand
> One-sentence description.

## Products
- Product A — what it does, who it is for
- Product B — ...

## Key facts
- Founded: ...
- Headquarters: ...
- Pricing: ...

## Pages
- [Home](https://example.com/): ...
- [Pricing](https://example.com/pricing): ...

## Contact
- hello@example.com
```

Two rules: keep every statement verifiable from a page on your own site, and update it whenever pricing or product scope changes.

## How to check yours

Fetch `https://yourdomain.com/llms.txt`. If it returns 404, you do not have one. If it returns 200, compare its claims against your pricing and product pages line by line. Then check `robots.txt` and your CDN rules to confirm the path is not blocked for `GPTBot`, `ClaudeBot` and `PerplexityBot`.

Bidvix checks for `llms.txt` presence and AI crawler access as part of its free diagnosis, so you can see the result for your own domain without guessing.

## Related reading

- [How to create an llms.txt file](/guides/how-to-create-llms-txt)
- [What is generative engine optimization?](/guides/what-is-generative-engine-optimization)
- [How do I know if AI cites my website?](/answers/how-do-i-know-if-ai-cites-my-website)