Indexability
Indexability is whether a page can be stored in Google's index and therefore shown in search results, a separate issue from whether it can be crawled.
Indexability is whether a page, once crawled by a search engine, can be stored in the index and made available in search results.
What Indexability Means in Marketing
Many sites have pages that are crawlable but not indexable. Crawlability is about access: can the bot read the page? Indexability is about the next step: once read, does the page qualify to appear in search results? These two questions have different technical causes and require different fixes.
A page fails the indexability test when it carries an instruction telling search engines not to include it, when its canonical tag points to a different URL, or when the content is considered too thin or duplicate to be worth indexing. All of these can happen on pages that are fully accessible to crawlers.
The most dangerous indexability problems are the accidental ones. A CMS setting that adds noindex to all pages by default, a developer who forgets to remove noindex from staging before pushing to production, or a canonical configuration that incorrectly consolidates pages can silently exclude entire sections of a site from search without any obvious signal.
How Indexability Works
The clearest way to prevent indexing is a noindex directive. This can appear as a meta tag in the page’s HTML head section or as an HTTP response header. When Google sees either, it respects the instruction and excludes the page from its index, even if it crawls the page regularly.
Canonical tags work differently. A canonical tag on Page A pointing to Page B tells Google that B is the preferred version. Google will typically index B and treat A as a duplicate. This is intentional behaviour for managing paginated content or filtered URLs, but a misconfigured canonical can accidentally consolidate authority away from the page you actually want indexed.
Content quality also affects indexability. Google can choose not to index pages it considers too thin, too similar to others it has already indexed, or of insufficient quality to be useful in results. There is no explicit instruction in these cases; Google simply declines to include the page.
Indexability Example
A news site enables a staging template flag that adds a noindex tag to every article published using the new format. For three weeks, every new article earns zero organic traffic despite being crawled. The Coverage report in Google Search Console shows the pages as excluded with the reason “noindex tag.” Removing the flag fixes the problem and the pages begin to appear in results within days.
Why Indexability Matters for Marketers
Indexability is where SEO investment can evaporate quietly. If a page is not in Google’s index, no amount of content quality, backlinks or technical optimisation will make it appear in search results. Checking indexability status for important pages during launches, migrations or template changes is one of the most critical QA steps in any SEO workflow.
Frequently Asked Questions
What is the difference between crawlability and indexability?
Crawlability is whether a bot can access and read a page. Indexability is whether the page, once crawled, can be stored in Google's index and shown in search results. A page can be crawlable but not indexable if it carries a noindex tag, has a canonical pointing to a different URL, or is content Google chooses not to index due to low quality. You can resolve crawlability problems and still face indexability problems; they require separate diagnoses and separate fixes.
What makes a page non-indexable?
The most common cause is a noindex meta tag in the page's head, which instructs Google not to include the page in its index. An X-Robots-Tag HTTP header can do the same. A canonical tag pointing to a different URL signals that this URL is a duplicate and the referenced URL should be indexed instead. Thin or duplicate content can also lead Google to decline indexing a page even without explicit instructions, though this is a quality judgement rather than a technical block.
How do you check if a page is in Google's index?
The URL Inspection tool in Google Search Console is the most reliable method. Enter the URL and it returns whether Google has indexed it, the last crawl date and any issues preventing indexing. You can also search Google for site:yourdomain.com/specific-page to see if it appears in results, though this is less precise since Google's visible search results and its full index are not identical.
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