What's the difference between indexable and indexed?

Indexable — the page can enter the index because nothing technically blocks it. Indexed — Google actually added it. An indexable page can still be unindexed, for example as “crawled – currently not indexed”.

How do I check whether a page is indexed?

Most reliably in Google Search Console, with URL Inspection. A site: search gives only a rough picture.

What most often makes pages non-indexable?

An accidental noindex from staging, a canonical pointing to another page after a template change, a new Disallow rule in robots.txt and server errors.

Indexability

A page is indexable when nothing technically prevents Google from adding it to the index: it returns 200, has no noindex, isn't blocked in robots.txt and its canonical points to itself. Indexability is necessary but not sufficient — whether the page actually gets indexed also depends on Google's assessment of the content.

Five conditions for indexability

A 200 status code — not 404, not 5xx, not a redirect (HTTP status codes).
No noindex — neither in meta robots nor in the X-Robots-Tag header.
No robots.txt block — Googlebot must be able to fetch the page (robots.txt).
A self-referencing canonical — or none; a canonical to another URL hands indexing over to that page.
Content accessible to the crawler — not only after login, not only after a click, not empty after rendering.

Indexable vs indexed

	Indexable	Indexed
Who decides	your site configuration	Google
What's checked	status, noindex, robots.txt, canonical	also content quality and uniqueness
How to check	SEO tools, monitoring	Google Search Console

How to check

status code, canonical and noindex — the redirect checker shows them for the final page,
robots.txt blocks — the robots.txt checker points to the rule,
actual indexing — URL Inspection in Search Console.

Monitoring indexability

Indexability is usually lost by accident and silently — with one line in a template, a plugin or robots.txt.

IndexRise checks all the conditions for monitored pages every night. When a page stops being indexable, you get one critical event with the cause: noindex, a canonical pointing elsewhere or a robots.txt rule. The dashboard also shows how many monitored pages are indexable and why the rest aren't.