What is an llms.txt file?
An llms.txt file is a Markdown-formatted document placed at the root of a website (at /llms.txt) that summarises the brand's key facts for AI agents. Where robots.txt tells crawlers what NOT to index, llms.txt tells reasoning agents WHAT to extract: brand identity, core facts, products, pricing, founding details. It's an emerging convention designed to reduce hallucination risk and make AI grounding more accurate.
Also known as: llms.txt, llms-full.txt, llms.txt file
Why it matters
AI assistants work in token-budget-constrained context windows. A concise, fact-dense llms.txt file is dramatically cheaper for them to parse than scraping the whole site — so they trust it more and cite it more often. For brands, it's a near-zero-cost lift in AI accuracy.
How Linksii relates
Linksii ships a free llms.txt generator at /free-tools/llms-txt-generator that builds a compliant file for any website in minutes. Linksii's own llms.txt is published and used in production at /llms.txt and /llms-full.txt.
Related terms
Track your brand across AI platforms
Linksii monitors how ChatGPT, Claude, Gemini, and Perplexity describe and recommend your brand — so you can measure llms.txt performance as a number, not a vibe.