llms.txt vs robots.txt: Key Differences Explained

robots.txt and llms.txtsound like cousins, and both are plain text files at your domain root — but they do opposite jobs. Confusing them can cost you AI visibility, so here's a clear breakdown.

robots.txt: a set of restrictions

robots.txt has been around since the 1990s. It tells automated crawlers which paths they should notaccess — admin pages, duplicate URLs, staging directories. It's fundamentally a blocking instrument, used to manage crawl budget and keep low-value pages out of the index. It says, in effect, “stay out of here.”

llms.txt: a set of invitations

llms.txt is the inverse. Instead of blocking, it highlights — it hands AI models a curated summary of what you wantthem to read and understand about your brand. It says “here's what matters, and here's how to describe us accurately.” If you're new to the format, start with What is llms.txt?

Side-by-side

Purpose: robots.txt restricts crawler access; llms.txt guides AI comprehension.
Tone:robots.txt is exclusionary (“don't crawl this”); llms.txt is curatorial (“focus on this”).
Audience: robots.txt targets search and crawler bots; llms.txt targets large language models.
Format: robots.txt uses directive lines (User-agent/Disallow); llms.txt uses readable markdown.

Do I need both?

Yes. They aren't competitors — they're complementary. Keep robots.txt to manage crawl budget and protect private paths, and add llms.txt to maximize how accurately AI assistants represent your brand. Together they cover both halves of modern discoverability: traditional search and generative AI.

Create your llms.txt in seconds

You likely already have a robots.txt. To add the other half, use our free llms.txt generator — paste your URL, review the auto-generated file, and upload it to your domain root.