llms.txt is a proposed plain-text file placed at the root of a website to give large language models a concise, curated guide to the site's most important content. It is a community proposal, not an official standard, and support across AI providers is uncertain, so it should complement, not replace, a well-structured site.
By Trux Nguyen, Founder and Director of Unitrux, with 5 years in marketing and SEO. Published 25 October 2026. Last updated 25 October 2026.
What it contains
Typically a short description of the site and links to key pages, sometimes with markdown versions of important content.
What is uncertain
| Question | Honest answer |
|---|---|
| Is it an official standard? | No, it is a proposal |
| Do major AI tools read it? | Support is not consistently documented |
| Does Google use it for rankings? | Google has not said it does |
Our expert view
Adding llms.txt is low effort and low risk, so we often add one, but we never sell it as a visibility shortcut. Clear, crawlable pages, consistent facts and real reputation still do the heavy lifting.
Demand
In Google Keyword Planner (United States, retrieved 25 October 2026), "llms txt" shows 1,000 to 10,000 monthly searches, with top-of-page bid estimates around $6.
Related reading
- LLM Optimization
- AI Search Ranking Factors
- What Is Generative Engine Optimization?
- LocalBusiness Schema
- Local SEO in the AI Era
- Online Reviews and AI Recommendations
- All AI search guides
About the author
Trux Nguyen is the Founder and Director of Unitrux, with 5 years of experience in marketing and SEO. Areas of work: SEO, AEO, GEO and AIO, local SEO, content strategy, schema markup, keyword research, Google Ads and analytics. Contact: [email protected].
Frequently asked questions
Should every site add llms.txt?
It does no harm and takes little time, but expect little impact on its own.
Is llms.txt like robots.txt?
No. robots.txt controls crawling; llms.txt is a suggested guide to content.
Does it block AI crawlers?
No. Access is controlled by robots.txt and server rules.
Limits and honest expectations
Search engines and AI assistants change their answers over time and no one controls them. Results vary by industry, city and competition, and we do not guarantee a position, a mention or a number of leads. We report what is measurable, plainly.
Sources
- Google Ads Keyword Planner, volume ranges and bid estimates for the keywords named in this article, retrieved 25 October 2026.
- Google Search Central, AI features and your website: https://developers.google.com/search/docs/appearance/ai-features
Get your free AI visibility audit
Find out whether ChatGPT, Gemini, Perplexity and Google name your business today, who they name instead, and what to do first. Request a free audit and we will walk you through it in plain language.