llms.txt Checker
Enter any website URL. We’ll tell you if they have llms.txt, what it contains, and whether it’s spec-compliant.
Why Check Another Domain’s llms.txt?
Checking another domain’s llms.txt file gives you direct insight into how that organization prioritizes its content for AI consumption. Since llms.txt is a public file, reviewing it is a standard research practice that reveals content hierarchy decisions, token optimization strategies, and AI readiness signals you can apply to your own site.
Competitor Research
See exactly how your competitors structure their AI content strategy. Which pages do they prioritize for AI models? How do they describe their site in the blockquote summary? What categories do they emphasize? Reverse-engineer their AI visibility approach to identify gaps in your own strategy.
Client Website Audits
When auditing a client’s AI readiness, checking for llms.txt presence is a quick signal of their technical SEO hygiene. If they have one, review its quality and compliance. If they do not, you have a clear recommendation to add it using our generator.
Outreach AI Readiness Verification
Before pitching a guest post, partnership, or citation opportunity, verify that the target site is AI-ready. A missing or poorly structured llms.txt signals that the site may not be optimized for AI citation, making your outreach less likely to produce measurable visibility results.
Strategy Modeling
Study how AI-forward companies like Stripe, Anthropic, and Cloudflare structure their llms.txt files. These organizations have publicly adopted the format and their files represent real-world best practices. Use them as reference models when designing your own content hierarchy.
Who Has llms.txt in 2026?
Enterprise adoption of llms.txt has grown steadily since the specification was proposed in late 2024. While still not universal, several high-profile technology companies now maintain llms.txt files at their domain roots. Stripe, Anthropic, Cursor, and Cloudflare are among the most prominent adopters, each using the format to guide AI models to their most important developer and product documentation.
Adoption is concentrated in developer-tooling and API-first companies, where AI coding assistants like Cursor and Claude Code actively read llms.txt files to navigate documentation. We are also seeing early adoption among content publishers and SaaS companies who want to control how AI models represent their brand in generative outputs.
If your check reveals that a site has no llms.txt, that is a common finding. According to Ahrefs data from May 2026, 97% of 38,000 domains analyzed received zero AI bot requests for an llms.txt file. This means most sites are missing the opportunity to guide AI models toward their best content. If your own site does not have an llms.txt yet, use our free generator to create one in seconds and deploy it to your domain root.
Quick tip: If you checked a domain and found no llms.txt, that does not mean the site is invisible to AI. It simply means they have not published a content guide for AI models. Many sites rank well in AI responses without one. However, adding an llms.txt gives you control over which content AI models prioritize and how your brand is described. Generate your llms.txt now →
Frequently Asked Questions
Can I check any domain?
Yes. You can check any publicly accessible domain on the web. Enter the full URL (e.g., https://example.com) and the tool will attempt to fetch the llms.txt file from that domain’s root. The domain must be publicly accessible over the internet.
What if a site has no llms.txt?
If a site has no llms.txt file at its root, the tool will report it as not found. You can then use our free generator to create a spec-compliant llms.txt file for your own site and upload it to your domain root at /llms.txt.
Does this check compliance or just presence?
The checker first detects whether an llms.txt file exists at the domain root. If found, it displays the raw file content and provides basic structure indicators. For a full 9-rule compliance check, use our validator tool which tests H1/H2 rules, absolute URLs, file size, blockquote presence, and more.
Is checking competitor’s llms.txt allowed?
Yes. llms.txt files are public files placed at a domain’s root directory, just like robots.txt. Checking a competitor’s llms.txt is a standard competitive research practice. The file is intentionally public and serves as a content guide for AI models. Reviewing how competitors structure their AI content strategy is a valuable research activity.