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What is an llms.txt file?
An llms.txt file is a short, plain-text file that sits at the root of your website, right alongside your robots.txt and sitemap.xml. Its job is to give large language models (LLMs), the systems behind tools like ChatGPT and Claude, a clear, curated summary of what your site is about and which pages matter most.
The idea was proposed in 2024 by Jeremy Howard of Answer.AI. It isn't widely used by AI systems yet, but llms.txt for Webflow is quick to set up, and more websites are beginning to adopt it.
Think of it as similar to a sitemap, but written for an AI to read and interpret rather than for a search engine crawler to index. Where a sitemap lists every page, llms.txt is deliberately selective: a short, human-written overview plus links to the handful of pages you'd want an AI system to understand your business through.
Does it actually help with AI visibility?
Right now, no. Google has been direct about this: John Mueller of Google's Search Relations team has said no AI system currently uses llms.txt, and Google's own AI optimisation guidance states you don't need AI text files to appear in Google Search, including its generative AI features.
Google isn't fully consistent on this though. Days after publishing that guidance, the Chrome team added an llms.txt check to Lighthouse's experimental agentic browsing audits. Mueller clarified the file isn't done for search, calling it a temporary crutch for AI coding tools parsing documentation, not something most business sites need to worry about.
That's worth saying plainly, because plenty of content online treats llms.txt as an established ranking factor. It isn't, not yet.
What it might become is a different question. Robots.txt started the same way: a voluntary convention that search engines eventually adopted because it was useful and low-effort to support. If AI systems move the same direction, having an llms.txt file in place means you're not starting from zero when it starts to matter.
That's the case for doing it now. Not because it moves the needle today, but because it costs very little and sets you up for when it might.
What content should go in the file
An llms.txt file follows a simple format: an H1 with your business name, a short blockquote summary of what you do, and then a handful of H2 sections listing the pages worth an AI's attention, each with a one-line description.
For a typical Webflow client site, that usually breaks down into:
- Who you are and what you offer. Be specific. "UK-based Webflow developer building custom sites for SMEs and agencies" tells an AI far more than "innovative digital solutions."
- Core services or products, linked individually with a short description each, rather than one generic "services" link. If your pricing is public, include it, since AI tools are frequently asked how much something costs.
- Key resources, your best case studies, guides, or cornerstone content. Depth matters more than volume here, and specific named pages beat one generic "blog" link.
- A contact page, so an AI knows where to point someone who wants to get in touch.
Leave out legal pages like your privacy policy and terms of service (nothing there worth an AI citing) and anything thin, outdated, or likely to change soon.
How to write an LLMs file
If you haven't written markdown before, the syntax is simple once you know the parts.
A single hash makes an H1: # Your Business Name. This is the only required line in the whole file.
A greater-than symbol makes a blockquote: > A one-line summary of what you do. It sits right under the H1 and gives an AI the fastest possible read on your business.
Double hashes make H2 section headers, like ## Services or ## Contact. These group your links so an AI can navigate by topic instead of working through one long list.
Each link follows the same pattern: - [Link title](https://example.com): An optional short description. The square brackets hold the clickable text, the URL sits in round brackets straight after with no space between them, and the description comes after a colon.
That last point catches people out. If there's a space between the closing square bracket and the opening round bracket, the link breaks and just shows as plain text. It's worth checking your file carefully before you upload it.
How to add an llms.txt file in Webflow
Webflow added native support for this in 2025, so you don't need a third-party workaround. To upload one:
- Go to Site Settings > SEO > LLMs.txt
- Click Upload file
- Choose your file (it must be under 100 KB)
- Click Save changes
Once you publish, the file goes live at yoursite.com/llms.txt.
Common mistakes to avoid
A few things trip people up:
- Making the file bloated. Webflow's technical cap is 100 KB, but that's a huge amount of text for this kind of file. A well curated llms.txt is usually only a few KB, closer to a short business summary than a document.
- Linking to broken or redirected pages. If an AI system follows a link in your llms.txt and hits a 404, it's reasonable to assume that dents trust in the rest of the file.
- Copy-pasting marketing copy. Hero text and sales language don't translate well. Write plainly, as if briefing someone who's never seen your site.
Is it worth doing now?
For most Webflow clients I work with, yes. It takes an hour or so to put together properly, Webflow's upload process is simple, and there's no downside to having it in place. It won't move your AI visibility today, but if llms.txt for Webflow becomes what robots.txt became for search engines, you'll already be there.
It's a small, sensible piece of future-proofing rather than a guaranteed win, and I'd frame it to clients that way rather than overselling it.
