Everything You Want to Know about ChatGPT-User
ChatGPT-User is the user-agent OpenAI uses when ChatGPT or a Custom GPT visits a web page on behalf of a user's question or a GPT Action. It is not used for automatic web crawling.
Last verified August 15, 2026 against OpenAI's published crawler docs
Why it's crawling your site
A user asked ChatGPT (or a Custom GPT) a question that required fetching your page live; because it's user-initiated, robots.txt rules may not apply.
How ChatGPT-User views your website
ChatGPT-User fetches raw page HTML (single-page fetch, user-triggered) — it does not execute JavaScript. Content that only appears after client-side rendering is invisible to it.
Paste a URL for the rendered-vs-crawled diff, blocked resources, and the sections that never reach the bot.
How to block ChatGPT-User
Add the rule below to your site's robots.txt. Most crawlers, including ChatGPT-User, check for changes within 24 hours.
User-agent: ChatGPT-User
Disallow: /Need the full walkthrough?
Partial blocks, per-directory rules, Cloudflare and server-level options, verification.