How it works
After crawling a page, a search engine processes what it found. It looks at the text, the title tag, the headings, the images and the links. Then it decides whether to store the page in its index. The index works like a very large library catalog. When someone searches, the results come from the index, not from the live web.
Not every crawled page is indexed. A search engine may leave a page out when:
- the page has a noindex tag
- the page is very similar to another page, so only one version is kept
- the canonical tag names a different address as the main version
- the page returns an error or redirects somewhere else
- the content adds little that is not already in the index
An example
A shop shows the same product at three addresses because of color filters. Google crawls all three. It indexes one and treats the other two as duplicates. Only the indexed one can appear in results. That is normal, as long as the one Google keeps is the one you wanted.
Why it matters
- A page that is not indexed cannot appear in search results at all.
- Being indexed is not the same as ranking well. It only means the page is eligible.
- An indexing problem often comes down to a single setting, so it can be quick to fix once you find it.
GOOD TO KNOWAsking Google to index a page in Search Console is a request, not a guarantee. Google still decides whether to store the page.
How to check yours
- Open Google Search Console and paste the page's full address into the URL inspection bar.
- Read the first line of the report. It says whether the address is on Google.
- If it is not, read the reason given in the page indexing section.
- For a quick first look, run the free audit. It checks for a noindex tag and a robots.txt block. Then read crawling and indexing, explained simply.