Which AI platforms currently support llms.txt?

Support is growing but not universal. Several AI platforms and tools have begun honoring llms.txt, but major models like ChatGPT and Claude haven't officially confirmed full support. Regardless, implementing llms.txt is low-effort and future-proofs your site as adoption increases. It also serves as useful documentation for any AI system that encounters it.

Is llms.txt a replacement for robots.txt?

No. They serve different purposes. robots.txt controls access — telling crawlers where they can and can't go. llms.txt provides context — telling AI models what your site contains and what's most important. You need both. A properly configured robots.txt that allows AI crawlers combined with an llms.txt that guides their understanding is the ideal setup.

How long should an llms.txt file be?

Keep it focused. Most effective llms.txt files are 50–200 lines covering 10–50 key pages. Going beyond that dilutes the signal. The purpose is to highlight your most important content, not catalog everything on your site. If you need more detail, use the llms-full.txt extension.

Can llms.txt hurt my AI visibility if done wrong?

An incorrect or misleading llms.txt is unlikely to hurt your visibility — AI models treat it as a helpful signal, not a definitive authority. However, a well-crafted llms.txt can meaningfully improve how AI models understand and represent your brand, making it worth the effort to get right.

How to Create an llms.txt File — Presenc AI

Step 1: Understand What llms.txt Is and Why It Exists

The llms.txt file is an emerging standard that helps AI language models understand what your site is about and which content is most important. Think of it as a companion to robots.txt — while robots.txt tells crawlers where they can and can't go, llms.txt tells AI models what your site contains and how to prioritize it.

The format was proposed to solve a real problem: AI models crawl billions of pages but struggle to distinguish your most important content from your least important. A blog post from 2019 and your current product page carry equal weight unless you signal otherwise. llms.txt gives you a way to explicitly tell AI systems "here's what matters, here's how to understand our site."

Step 2: Structure Your llms.txt File

An llms.txt file is a plain text (or Markdown) document hosted at your domain root: yoursite.com/llms.txt. The file follows a structured format with specific sections. Start with a title line using a Markdown heading, followed by a brief description of your site or organization. Then organize your content into sections with links to your most important pages.

Here's the basic structure:

# Your Brand Name

> Brief description of what your company does and what your site covers.

## Main Resources

- [Product Overview](https://yoursite.com/product): Description of this page

- [Documentation](https://yoursite.com/docs): Complete technical documentation

## Optional

- [Blog](https://yoursite.com/blog): Industry insights and product updates

Step 3: Choose What to Include

Not everything on your site belongs in llms.txt. Prioritize pages that define your brand identity, explain your products, and contain information you want AI models to surface when users ask about your category. Good candidates include your main product or service pages, pricing pages, about page, key feature documentation, comparison pages, and your most authoritative blog content.

Exclude pages that aren't useful for AI understanding: login pages, terms of service, privacy policy, admin panels, and thin content pages. The goal is a curated list of 10–50 pages that give an AI model a comprehensive understanding of your brand and offerings.

Step 4: Write Effective Descriptions

Each link in your llms.txt should include a brief description that helps AI models understand the page's content and relevance. Write these descriptions as if you're briefing a knowledgeable colleague, not writing marketing copy. Be specific and factual: "Comparison of our enterprise plan vs. competitor X with pricing, features, and use case analysis" is far more useful than "Learn why we're the best choice."

Keep descriptions under 200 characters per link. Use plain language, avoid jargon that only insiders would understand, and focus on what information the page contains rather than what action you want readers to take.

Step 5: Deploy and Validate Your llms.txt

Place your llms.txt file at the root of your domain so it's accessible at https://yoursite.com/llms.txt. Ensure it returns a 200 status code and the correct content type (text/plain or text/markdown). Test accessibility by navigating to the URL directly — if you can read it in a browser, AI crawlers can read it too.

Some implementations also support an extended version at /llms-full.txt that contains more detailed content for AI models that want deeper context. If you choose to create both, keep the standard llms.txt as a concise overview and use llms-full.txt for comprehensive detail.

Step 6: Maintain and Update Regularly

An llms.txt file is not a set-and-forget asset. When you launch new products, restructure your site, or retire old pages, update your llms.txt accordingly. Broken links in your llms.txt signal poor maintenance and can reduce AI trust in your site's information. Set a quarterly review reminder to verify all links are active and descriptions remain accurate.

Also monitor which AI platforms have adopted llms.txt support. The standard is evolving, and new platforms may begin honoring the file, increasing its impact on your AI visibility over time.

Step 7: Combine with Other AI Accessibility Measures

llms.txt works best as part of a broader AI accessibility strategy. Pair it with a properly configured robots.txt that allows AI crawlers, structured data markup on your key pages, and a comprehensive sitemap. Together, these signals give AI platforms every opportunity to understand and accurately represent your brand. Presenc AI can help you monitor whether these measures are translating into actual AI visibility improvements across platforms.

How to Create an llms.txt File