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robots.txt tells web crawlers which URL paths they may request. It can help manage crawling, but it cannot make a page private or guarantee that a URL stays out of Google Search. For search exclusion, let Google crawl the page and read a noindex directive; for privacy, require authentication or another access-control measure.
What robots.txt does
The Robots Exclusion Protocol lets a site communicate crawler access preferences for URL paths. The Internet Engineering Task Force standardized the protocol in RFC 9309, published in September 2022. The standard is explicit: “These rules are not a form of access authorization.”
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A crawler that successfully retrieves a site’s robots.txt is expected to follow its parseable rules under the RFC. These rules govern crawler requests, not what a person can access in a browser or what a search engine may list.
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Guarantee that a URL is absent from Google
A Disallow rule can prevent Google from crawling a path, but it does not guarantee that the URL will be excluded from search results. Google explains that it may index a blocked URL if it discovers the address through links or other means. Because Google cannot fetch the blocked page, it cannot read its contents and may show no snippet. See Google’s robots.txt introduction.
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Keep content private
The robots.txt file is publicly accessible. Listing a path there does not prevent visitors or other crawlers from requesting it, and can draw attention to a URL. For sensitive content, use an appropriate access-control measure, such as HTTP authentication, as RFC 9309 advises.
Communicate noindex to a page Google cannot crawl
Google can act on a robots meta tag or an X-Robots-Tag HTTP header only when it can crawl the page or resource and see that instruction. If a robots.txt rule blocks the URL, Google cannot read its noindex directive. Google’s documentation covers both forms in its robots meta tag and X-Robots-Tag guide.
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Choose the mechanism for your goal
| Goal | Use | Important limit |
|---|---|---|
| Manage crawler requests to URL paths | robots.txt Allow and Disallow rules |
Does not secure the content or guarantee removal of a URL from search. |
| Keep a crawlable page out of Google Search | A robots meta noindex directive or an X-Robots-Tag: noindex header |
Google must be able to crawl the page or resource to read the directive. |
| Restrict access to sensitive content | Authentication or another server- or application-level access-control measure | A public robots.txt file is not access control. |
These mechanisms solve different problems; using one as a substitute for another can produce the opposite of the intended result.
Where robots.txt belongs and how it is formatted
RFC 9309 specifies a file named /robots.txt at the top level of a service—for example, https://example.com/robots.txt. It specifies UTF-8 encoding and the text/plain media type. A file placed in a subdirectory does not serve as the service’s root robots.txt under this standard.
The file groups rules by crawler user-agent and uses directives such as Allow and Disallow to describe paths. Matching is case-sensitive, starts at the first octet of the path, and uses the most specific matching rule. If equally specific Allow and Disallow rules conflict, the RFC says the Allow rule should be used. Implementations can vary, so a rule should be checked against the crawler whose behavior matters.
Use robots.txt to point crawlers to a sitemap
Google supports a Sitemap: field containing a fully qualified sitemap URL. Google says the sitemap can be hosted on another host and that a robots.txt file may contain multiple sitemap fields. See Google’s explanation of how it interprets the robots.txt specification. A sitemap entry helps discovery; it does not override access rules or make a URL private.
How crawlers handle robots.txt failures
RFC 9309 distinguishes an unavailable file from an unreachable one. For an unavailable response such as an HTTP 4xx, the RFC says a crawler may access resources. When server or network errors make the file unreachable, the RFC says crawlers must assume complete disallow, subject to allowances for prolonged failures and cached copies. These are standards-based directions, not a guarantee that every crawler behaves identically.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThe RFC also says crawlers should not use cached robots.txt content for more than 24 hours unless the file is unreachable. If a site’s rules appear not to take effect, check that the root file is reachable and returns the intended content; then account for crawler-specific behavior and caching.
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