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robots.txt for blocking known AI bots/crawlers
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| User-agent: ChatGPT-User | |
| Disallow: / | |
| User-agent: CCBot | |
| Disallow: / | |
| User-agent: GPTBot | |
| Disallow: / | |
| User-agent: Google-Extended | |
| Disallow: / | |
| User-agent: Omgilibot | |
| Disallow: / | |
| User-agent: FacebookBot | |
| Disallow: / | |
| User-agent: ImagesiftBot | |
| Disallow: / | |
| User-agent: Applebot-Extended | |
| Disallow: / | |
| User-agent: anthropic-ai | |
| Disallow: / | |
| User-agent: ClaudeBot | |
| Disallow: / | |
| User-agent: Omgili | |
| Disallow: / | |
| User-agent: Diffbot | |
| Disallow: / | |
| User-agent: Bytespider | |
| Disallow: / | |
| User-agent: PerplexityBot | |
| Disallow: / | |
| User-agent: cohere-ai | |
| Disallow: / |
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There's limitations to this. The most obvious one is that many bots will simply not respect or honor your robots.txt. The ones from major companies supposedly do. Think of it as more of a polite request, rather than a "block".
Also, Microsoft and Google AI have been shown to essentially bypass the need for direct crawling by their AI bots, by training their models from the data already collected and cached from your site by the Google or Bing search engines. This loophole unfortunately makes it impossible to opt-out of those AI's without also removing your sites from the major search engines.
Cloudflare has tools for blocking AI scrapers, but you'll need to subscribe to their services of course.
Anubis is another more lightweight option, used by sites like the Archlinux Wiki, and kernel.org.