A noindex tag tells Google not to show a page in search results, while still letting people and links reach it normally. You would use it on pages that exist for a reason other than ranking, such as thank you pages, internal search results, filtered category pages, or landing pages built purely for paid traffic. Get it wrong, though, and you can accidentally pull a page you actually wanted ranking straight out of Google’s index.
What the noindex tag actually does
It is easy to mix up noindex with robots.txt, but they do different jobs. Robots.txt tells search engines not to crawl a page at all. A noindex tag lets Google crawl the page but instructs it not to include that page in search results. If you block a page in robots.txt and also add a noindex tag, Google never gets the chance to see the noindex instruction because it is not allowed to visit the page in the first place. That contradiction is one of the more common technical mistakes we come across when running an SEO audit for a new client.
When you should actually use it
Not every page deserves a spot in Google’s index. Some pages exist purely to serve a visitor who has already found you through another channel.
| Page type | Why you would noindex it |
| PPC landing pages | Built for a single ad campaign, often near duplicates of your main service page |
| Thank you or confirmation pages | No search value and can leak into results if left open |
| Internal search results | Creates thousands of thin, near identical URLs |
| Staging or development copies | Duplicate content that competes with the live site |
| Filtered or sorted category pages | Same products, different URL, adds little unique value |
| Login or account pages | Not relevant to anyone arriving from a search query |
This comes up a lot with paid media work. A landing page you have built for a Google Ads agency campaign, a Facebook ads campaign or a LinkedIn advertising push is often near identical to your core service page, just with different messaging for that audience. Letting Google index every version can split your rankings and send organic visitors to a page written for someone who has already seen your ad. Noindexing the campaign specific version and keeping your main page open usually solves this.
How to add the tag
For HTML pages, you add a meta tag inside the head section: <meta name=”robots” content=”noindex”>. For files that are not HTML, such as PDFs, you use the X-Robots-Tag HTTP header instead, since there is no head section to place a meta tag in.
Where people trip up
I have seen a client move to a new CMS where the developer forgot to strip the noindex tags carried over from the staging site. Traffic fell by roughly a third within three weeks before anyone noticed, simply because half the site had quietly vanished from Google. It is a painfully easy mistake to make and a slow one to spot unless someone is checking Search Console regularly.
A few other things worth watching. Noindexing a page that already has backlinks pointing to it wastes that authority, since the page can no longer pass value through your site. Leaving test or campaign pages noindexed after launch is another classic, particularly once a PPC marketing agency has moved on to the next campaign and nobody circles back to tidy up. If your team runs its own paid search, working through some structured Google Ads training helps catch this kind of thing before it becomes a habit.
Google’s own Search Central documentation is worth bookmarking if you want the technical detail straight from the source.
FAQs
Does noindex affect my Google Ads Quality Score?
No. Quality Score looks at landing page experience, relevance and expected click through rate. Noindex has no bearing on that, since it only concerns organic search visibility.
Can a noindexed page still receive traffic?
Yes. Visitors can still reach it directly, through a link, or through paid ads. It simply will not appear in organic search results.
How long does it take Google to drop a noindexed page from search results?
It varies, but it is usually a matter of days to a few weeks, depending on how often Google recrawls the page.
Does a noindex tag stop a page passing link value?
It does not stop the page passing value to pages it links out to, but the noindexed page itself cannot appear in results or build its own ranking signals.
If you are running paid landing pages across social media advertising as well as search, it is worth having someone check which ones should be open to Google and which should not. Get in touch with Flow20 if you would like a quick technical review of your site’s indexing setup.
