The web has always had files that help machines understand websites. Robots.txt tells search engine crawlers which pages to skip. Sitemaps tell them which pages exist. LLMs.txt is a newer addition to that idea, designed specifically for artificial intelligence tools rather than traditional search engines.
It is not a ranking factor. It will not put you on page one of Google overnight. But given how quickly AI tools are becoming part of how people find information online, it is worth understanding what LLMs.txt actually is, whether it does anything useful, and how to add one to your site without needing a developer.
What Is an LLMs.txt File?
An LLMs.txt file is a plain-text document placed at the root of a website, meaning it would live at yourwebsite.com/llms.txt. Its purpose is to give large language models (LLMs), the AI systems that power tools like ChatGPT, Claude, and Perplexity, a clear, structured summary of what a website contains and which pages are worth reading.
The format was proposed by Jeremy Howard, founder of fast.ai, in September 2024. The concept draws a loose parallel with robots.txt. Where robots.txt instructs crawlers on what they cannot access, LLMs.txt acts more like a guided tour for AI tools: here is what we do, here are our most important pages, here is how we want to be understood.
A basic LLMs.txt file might include:
- A short description of the website or business
- Links to key pages, such as the homepage, service pages, or about page
- Links to supporting content, such as blog posts or documentation
- Optional: links to a more detailed
llms-full.txtfile containing richer content
The file uses Markdown formatting, which means it is human-readable as well as machine-readable. It is deliberately simple by design.
Where Did LLMs.txt Come From?
The proposal emerged at a point when web developers and site owners were beginning to ask whether the existing infrastructure of the web, robots.txt, sitemaps, schema markup, was fit for purpose in an AI-driven landscape.
Traditional crawlers from Google or Bing are built to parse HTML, follow links, and index content. AI tools that draw on live web content work differently, and not always predictably. The idea behind LLMs.txt was to give site owners a straightforward way to communicate the structure and priorities of their content to those tools.
It has not been formally adopted by Google, OpenAI, Anthropic, or any other major platform as a standard. However, a growing number of websites, particularly in the tech sector, have begun adding the file, and some AI tools have started to use it when available.
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Does LLMs.txt Actually Do Anything?
This is the question most people want answered, and the honest response is: probably a little, but it depends on the AI tool.
Some AI platforms have confirmed they do read LLMs.txt files when crawling sites. Others have not addressed it publicly. There is no evidence that adding an LLMs.txt file improves your Google rankings or increases traffic in a measurable way in the short term.
What the file can do is help AI tools that do read it to understand your site more accurately. If an AI is attempting to summarise what your business does, or recommend your content in a response, having a clear and structured LLMs.txt file means the information it works from is more likely to be accurate and complete.
Think of it this way: if an AI tool visits your website and has to piece together what you do from across dozens of pages, the conclusions it draws may not reflect your business accurately. An LLMs.txt file gives it a clear starting point.
The key questions people ask about LLMs.txt include:
Is LLMs.txt a Google ranking factor? No. Google has not announced any plans to use LLMs.txt as a signal in its search algorithm.
Does LLMs.txt help with AI Overviews? Not directly. Google AI Overviews draw from indexed content, not from LLMs.txt files.
Do all AI tools read LLMs.txt? No. Support varies between platforms and is still developing. Some tools do read it; others do not yet.
Is there any downside to adding an LLMs.txt file? Not that has been identified. The file is small, takes minimal time to create, and does not affect how traditional search crawlers handle your site.
What Should an LLMs.txt File Contain?
A well-structured LLMs.txt file is brief and clear. Here is an example of what a basic one might look like:
The file does not need to list every page. The aim is to highlight your most important content and give AI tools enough context to represent your site accurately.
How to Add LLMs.txt to Your WordPress Website
For most WordPress users, the simplest route is to use a plugin that generates the file automatically.
Using Rank Math to Generate LLMs.txt
Rank Math Pro includes an LLMs.txt generator as part of its feature set. Once enabled, it creates and maintains the file automatically based on your site’s content, updating it as you publish new pages and posts. For anyone already using Rank Math Pro for their SEO on WordPress, this is the most straightforward option.
To enable it in Rank Math Pro, go to Rank Math > General Settings > LLMs.txt and toggle the feature on. You can then customise which content types are included.
Using Other Plugins or Manual Creation
If you are using Yoast SEO or another plugin, some third-party tools and lightweight standalone plugins also offer LLMs.txt generation. It is also possible to create the file manually using a plain-text editor and upload it to your website’s root directory via FTP or your hosting file manager.
Manual creation gives you more control over what is included, but it does require you to update the file yourself as your site grows.
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How to Validate Your LLMs.txt File
Once your file is live, it is worth checking it is correctly formatted. An LLMs.txt validator is a tool that reads your file and confirms it follows the correct structure, checking for things like broken links, formatting errors, or missing sections.
You can check your live file simply by visiting yourwebsite.com/llms.txt in a browser to confirm it is accessible. For more thorough validation, tools such as the official validator at llmstxt.cloud can be used to check your file against the proposed specification.
Getting the format right matters because a poorly structured file may be partially ignored or misread by AI tools, which defeats the purpose of having one.
LLMs.txt vs Robots.txt vs Sitemap: What Is the Difference?
These three files serve different purposes and are not in competition with each other.
Robots.txt is an instruction file for search engine crawlers. It tells them which pages they are and are not allowed to visit. It does not guide AI tools in the same way.
An XML sitemap lists all the pages on your site that you want search engines to index. It is a comprehensive inventory, but it does not explain what the site is about or prioritise content.
LLMs.txt sits alongside these as a guide specifically for AI tools. It is not a replacement for robots.txt or your sitemap; both of those remain important for traditional SEO. The three files work together to give different types of machines a clear picture of your site.
Should You Add an LLMs.txt File?
For most websites, yes, with a caveat. The file is not a priority in the way that technical SEO fundamentals, well-structured content, and a clear internal linking strategy are priorities. Those things have a proven and direct impact on visibility. LLMs.txt is more of a sensible supplementary step.
The argument for adding it is straightforward: the effort is minimal, there is no known downside, and as AI tools become a more meaningful source of referral traffic, having the file in place means your site is better positioned for however that landscape develops. Waiting until LLMs.txt becomes a confirmed standard means playing catch-up.
The argument for not rushing is equally sensible: if your site has more pressing technical or content issues, those are a better use of your time right now.
For businesses that are already running a managed SEO strategy and have their technical foundations in good order, adding an LLMs.txt file is a low-effort box worth ticking.
Keeping Up with How AI Tools Crawl the Web
LLMs.txt is one small part of a broader shift in how AI tools interact with web content. As those tools become more prominent, in search, in chatbots, in research tools, understanding how they read and use your site becomes more relevant.
The broader picture includes things like E-E-A-T signals, schema markup, content structure, and making sure your key pages are crawlable and indexed. LLMs.txt slots into that picture as a modest but practical addition.
If you want a clear view of how your website is performing for both traditional search and AI visibility, or if you are not sure where to start with technical SEO, get in touch with Suki Marketing or take a look at our SEO services to see how we approach it.
