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You can tell specific AI crawlers not to visit your site while allowing Google Search to crawl it: give Googlebot and each AI crawler its own rule group in your site’s robots.txt. For example, you can allow Googlebot and OpenAI’s OAI-SearchBot, but disallow GPTBot. The key distinction is that robots.txt communicates crawler preferences; it does not guarantee a technical block or protect private content.
How do I block AI crawlers without blocking Google?
Add separate user-agent groups to your site’s robots.txt. Keep Googlebot explicitly allowed, then disallow the AI crawler tokens you want to exclude. A basic example is:
User-agent: Googlebot
Allow: /
User-agent: OAI-SearchBot
Allow: /
User-agent: GPTBot
Disallow: /
User-agent: ClaudeBot
Disallow: /
User-agent: Bytespider
Disallow: /This example allows Googlebot and OAI-SearchBot to crawl the site, while asking GPTBot, ClaudeBot, and Bytespider not to crawl any paths. Change the AI entries to reflect your policy; you do not have to use the same rule for every crawler.
Put the file at the site’s root so it is served at /robots.txt. Before publishing, check that the file is available at that path and that the Googlebot group is not accidentally set to Disallow: /. Keep the rules in separate groups rather than combining tokens into a broad rule that could unintentionally affect a crawler you want to allow.
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Choose rules by crawler, not by the label “AI”
Decide what you want each named crawler to do. OpenAI documents OAI-SearchBot as the crawler used to surface sites in ChatGPT search and GPTBot as a crawler for content that may be used to train foundation models. Those are distinct purposes, and OpenAI says each setting is independent of the others. You can therefore allow one and disallow the other.
For instance, if you want to permit ChatGPT search discovery but opt out of GPTBot crawling, keep the OAI-SearchBot allow group and the GPTBot disallow group. If you want to exclude both, disallow both separately. Do not infer that a rule for one OpenAI crawler automatically controls the other.
Which crawler rules should I use?
Start with the crawlers relevant to your publishing policy and the agents you actually see in your logs. The tokens below are examples, not a complete or permanent list; crawler identities and token lists can change.
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| Token | Documented purpose or identity | Example decision |
|---|---|---|
Googlebot |
Google Search’s smartphone and desktop crawlers use the Googlebot robots.txt token. | Allow it if you want pages crawled for Google Search. |
OAI-SearchBot |
OpenAI’s search crawler for surfacing sites in ChatGPT search. | Allow or disallow it according to your ChatGPT search visibility preference. |
GPTBot |
OpenAI’s crawler for content that may be used to train foundation models. | Disallow it if you want to ask this crawler not to crawl your pages. |
ClaudeBot |
An AI crawler token listed in Cloudflare’s bot reference. | Set a separate rule if your policy covers this crawler. |
PerplexityBot |
An AI crawler token listed in Cloudflare’s bot reference. | Set a separate rule if your policy covers this crawler. |
Bytespider |
An AI crawler token listed in Cloudflare’s bot reference. | Set a separate rule if your policy covers this crawler. |
The table does not imply that every token is active on your site or that the list is exhaustive. Confirm the current token and identity against a maintained crawler reference and your own traffic before deploying a rule. A user-agent name alone is not proof that a request came from the crawler it claims to be.
Does robots.txt guarantee AI crawlers cannot access my content?
No. A robots.txt rule is a crawler-access preference, not authentication or a guaranteed network-level block. Google describes the file as a way to control crawling and warns that robots.txt is not a reliable way to remove a URL from Search; Cloudflare likewise notes that compliance is voluntary. A crawler that ignores the rule can still request the content.
That difference matters if the content must remain confidential or inaccessible. Do not publish sensitive material and rely on a disallow line to secure it. Use authentication or another access-control mechanism for content that should not be publicly retrievable. For traffic that ignores robots.txt, use a firewall, bot-management system, rate limits, IP controls, or other server-side measures appropriate to the site. Cloudflare documents AI Crawl Control as one option for blocking selected AI crawlers.
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Robots.txt is selective; enforcement is a separate layer
| Approach | Purpose | Selectivity | Enforcement and operations |
|---|---|---|---|
robots.txt |
Communicates crawl preferences to compliant crawlers. | Can target named user agents, such as Googlebot or GPTBot. | A static file is simple to maintain, but compliance is voluntary. |
| WAF or bot-management control | Blocks or limits requests at the network or edge layer. | Depends on the controls offered and how the site configures them. | Provides enforcement beyond a voluntary file; requires managed rules or configuration. |
| Authentication or access control | Restricts access to content that should not be public. | Applies to protected paths or resources as configured. | Access requires authorization; appropriate when the goal is security rather than crawler preference. |
The table describes different jobs, not interchangeable ways to achieve the same outcome. Robots.txt is useful for expressing a crawler policy; edge controls address noncompliant requests; access control protects content from unauthorized access. A site may need more than one layer.
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If your goal is to keep a URL out of Google’s index, a robots.txt disallow rule is not the right removal mechanism. A blocked URL may still appear in Search if other pages link to it, because Google may know the URL exists without crawling its contents.
Google says to use a noindex directive or access control when you want to prevent indexing. For noindex to work, Googlebot must be able to crawl the response and read the directive in the page’s meta tag or the X-Robots-Tag HTTP header. If robots.txt prevents the crawl, Google cannot see the directive there. This is a separate decision from whether to allow AI crawlers.
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How can I check that Googlebot and AI crawler rules are working?
Verify both the rule file and the requests reaching your site. After updating robots.txt, inspect access logs for Googlebot and the AI agents you targeted, review Search Console crawl and indexing reports, and check that important pages still render when Googlebot requests them.
- Review the published file. Open the site’s root
/robots.txtand confirm the intended groups and directives are present. Read each group against your policy: Googlebot should be allowed if preserving Google crawling is the goal, and each AI token should have its own intended rule. - Confirm crawler identity. User-agent strings can be spoofed. Google recommends checking purported Googlebot requests with a reverse DNS lookup or matching the source address against Google’s published Googlebot IP ranges. Do not treat a request as genuine Googlebot solely because its user-agent header says so.
- Inspect server logs. Look for requests from Googlebot and the named AI agents after deployment. Compare the reported user-agent and request source; if a request continues despite a disallow rule, determine whether it is a noncompliant crawler or a request falsely claiming that identity.
- Check Google’s crawl and indexing reports. Use Search Console to watch for unexpected crawl or indexing changes, and test important pages for accessibility to Googlebot. A crawler rule change should not accidentally block the pages you need Google to fetch.
- Allow time for systems to adjust. OpenAI says changes to robots.txt may take about 24 hours to affect its search systems. A rule appearing in the file does not mean every crawler has already refreshed its view of it.
- Escalate noncompliant traffic. If a verified or suspected bot continues requesting disallowed content, robots.txt has reached its limit as a preference signal. Use an appropriate firewall, bot-management, rate-limit, IP, or authentication control rather than adding more disallow lines and assuming they enforce access.
What are common mistakes when blocking AI crawlers?
Most failures come from confusing a crawler preference with a security control, or from applying a broader rule than intended. Check these points before and after changing the file.
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- Treating all AI crawlers as one agent. OpenAI’s OAI-SearchBot and GPTBot have different documented purposes and independent settings. Other services also have separate tokens, so a single rule does not represent a complete site policy.
- Assuming disallow removes a URL from search. Crawling control and index removal are different. Use a crawlable
noindexresponse or access control for the indexing or access outcome you need. - Assuming every request follows the file. robots.txt compliance is voluntary. A disallowed path can still receive requests from noncompliant traffic.
- Trusting a user-agent string without verification. Headers can be forged. Confirm purported Googlebot traffic through the verification methods Google recommends before using it to diagnose crawler behavior.
- Using a stale or overly broad crawler list. Add agents relevant to your policy and logs, and verify their current tokens before deployment. A name in a reference list is not evidence that the same crawler has visited your site.
How should I choose a policy for my site?
Make the policy decision by separating three outcomes: Google Search crawling, AI search discovery, and use by crawlers that may support model training. Then choose the control layer that can actually deliver each outcome.
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- Preserve Google Search. Keep a dedicated Googlebot group that allows crawling, then verify the result in logs and Search Console.
- Decide whether to permit AI search discovery. For OpenAI’s ChatGPT search visibility, set OAI-SearchBot independently from GPTBot. Apply the same deliberate, crawler-specific reasoning to other services rather than assuming one token governs them all.
- Decide whether to disallow training-related crawling. If your policy is to ask GPTBot not to crawl, add a separate GPTBot disallow group. Be precise: this expresses a request to that crawler; it does not establish a universal restriction on all possible access or uses of the content.
- Decide whether preference is enough. For cooperative crawlers, robots.txt communicates your preference. For actual access restriction, add appropriate network controls or authentication. Match the mechanism to the consequence you need.
- Review and monitor. Keep the file aligned with your publishing policy, watch relevant requests, and revisit the crawler identities when your logs or the services’ documentation change.
A compact policy can be selective without making Google Search collateral damage. The important operational distinction is that each crawler receives its own rule, while any guarantee of blocked access must come from enforcement or access control rather than the robots file alone.
Frequently Asked Questions
Do Google’s desktop and mobile crawlers need different robots.txt rules?
No. Google’s smartphone and desktop Search crawlers use the same Googlebot token in robots.txt, so a separate allow group for each device type is not needed.
Can a robots.txt disallow rule remove a URL that is already in Google?
No. A disallow rule governs crawling, not removal from the index; Google may retain a URL it knows about through links. For an indexing removal, use a crawlable noindex response or restrict access.
Will blocking GPTBot also block ChatGPT search visibility?
Not by itself. OpenAI identifies OAI-SearchBot separately for ChatGPT search, and says the crawler settings are independent, so the two tokens need separate policy choices.
How quickly does OpenAI update after a robots.txt change?
OpenAI says its systems may take about 24 hours to adjust for search results after a site updates robots.txt. That timing describes its search systems, not a guaranteed refresh interval for every crawler.
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