Which takes precedence when robots.txt and Noindex tags are used together?

When robots.txt and the Noindex tag both apply to the same page, the Noindex tag typically does not take effect. Because the core function of robots.txt is to restrict search engine crawlers from crawling pages, if a page is blocked from crawling by robots.txt, crawlers cannot access the page and thus cannot read the Noindex tag, resulting in the Noindex directive being ineffective. There are two typical scenarios: - Scenario 1: Crawling prohibited by robots.txt + Noindex tag: Crawlers cannot access the page due to robots.txt restrictions, the Noindex tag is not read, and the page may still be indexed (if previously crawled) or cannot be processed correctly. - Scenario 2: Crawling allowed by robots.txt + Noindex tag: Crawlers can access the page normally and read the Noindex tag, in which case the Noindex takes effect and the page will not be indexed. In practice, if you need to prevent a page from being indexed, it is recommended to only use the Noindex tag (ensuring the page is crawlable); if you need to completely prevent crawler access, you can use robots.txt. Avoid using both simultaneously, as this may cause Noindex to fail and affect the management of the page's visibility in search engines.