noindex
Also called: no index, noindex tag, noindex directive, meta noindex
Noindex is a directive that tells search engines to keep a page out of their index, so it never appears in search results. You set it either with a <meta name="robots" content="noindex"> tag in the page head or with an X-Robots-Tag: noindex HTTP response header.
How noindex works
Google discovers a noindex rule only when Googlebot crawls the page and reads either the meta robots tag or the X-Robots-Tag response header. That detail is the single biggest gotcha: the page has to stay crawlable. If you also block the URL in robots.txt, the crawler never fetches the page, never sees the noindex, and the URL can still surface in results from external links. Google’s docs are explicit that a page must not be disallowed for the noindex rule to be effective.
The meta version lives in the <head>:
<meta name="robots" content="noindex">The header version handles non-HTML files like PDFs and images:
X-Robots-Tag: noindexnoindex is separate from nofollow. noindex removes the page from the index; nofollow governs whether the links on it get followed. You can combine them (noindex, nofollow), but they answer different questions. Removal is not instant either. Googlebot has to recrawl before it acts, which can take days to months depending on how often it visits the URL. The URL Inspection tool in Search Console lets you request a faster recrawl and confirm the tag was seen.
Good uses: thank-you pages, internal search results, thin tag archives, staging content, paginated near-duplicates. Anything you want live for users but out of the index.
How it affects your traffic
The failure mode is a noindex tag that escapes onto pages you actually want ranking, usually when a staging setting ships to production or a CMS plugin applies it too broadly. The symptom is a fast, steep drop in indexed pages plus the "Submitted URL marked noindex" status in Search Console. A technical SEO audit catches rogue noindex directives (both meta tags and X-Robots-Tag headers) across the whole site before they quietly deindex revenue pages. If you are already bleeding traffic after a deploy, our Technical SEO work reverts the offending rule and requests re-indexing so those pages recover.
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