Indexing
Also called: search engine indexing, Google indexing, indexed page, index
Definition
Indexing is the step where a search engine analyzes a crawled page and stores it in its index, the database it pulls results from. A page that is not indexed cannot appear in search results or in AI answers built on them.
Indexing is how a page gets into a search engine's library. Google describes three stages: crawling (finding and downloading pages), indexing (understanding them and storing the information) and serving (returning results for a query). If a page is not in the index, nothing else in SEO matters for that page.
How it works
After Googlebot fetches a page, Google analyzes its text, key tags and attributes, images and videos. It also groups similar pages and picks a canonical, the version that may be shown in results; the others are alternates.
Two facts from Google that save a lot of worry:
- Indexing is not guaranteed. Google says not every page it processes will be indexed.
- You cannot pay for it. Google says it does not accept payment to crawl a site more often or rank it higher.
Common reasons pages are not indexed: blocked by robots.txt, a noindex tag, login walls, thin or duplicate content, or Google choosing a different URL as canonical. Search Console's Page indexing report and URL Inspection tool show what happened to a given URL.
Why it matters now
Indexing is also the gate for AI search. Google says a page must be indexed and eligible to show a snippet to appear in AI Overviews or AI Mode. ChatGPT search and Perplexity also rely on search indexes and their own crawlers; OpenAI says sites that block its search crawler will not appear in ChatGPT search answers. A page no index can see cannot be cited.
For faster discovery on engines that support it, see IndexNow. Google discovers URLs through links and sitemaps.
How it plays out on Reddit
Reddit threads get crawled and indexed constantly, which is part of why they show up so quickly for new questions. Google also has access to Reddit's Data API under its February 2024 deal, which Google said gives it fresher information about Reddit content.
What it means for you: when you answer a Reddit thread, your comment becomes part of a page that Google and AI crawlers already visit. Your own blog post might wait to be crawled; a reply in an active, already-ranking thread is indexed as part of that thread. That is one reason a single good comment in the right thread can travel further than a new page. The Reddit SEO guide explains how to pick those threads.
One caveat: removed comments disappear from the thread, so they do not carry anything. Follow the subreddit's rules or the work is wasted.
Common mistakes
- Leaving `noindex` on after a launch. Staging settings copied to production are a classic.
- Blocking crawlers too broadly. A blanket bot block in robots.txt or a firewall can remove you from search and AI answers.
- Publishing near-duplicates. Google may index one version and ignore the rest.
Frequently asked questions
How long does Google take to index a new page?
Google does not publish a fixed time. Pages on sites that are crawled often, linked internally and listed in a sitemap tend to be found sooner.
How do I check if a page is indexed?
Use the URL Inspection tool in Google Search Console. A site: search gives a rough idea but is not reliable for individual URLs.
Can I pay Google to index my site faster?
No. Google says it does not accept payment to crawl a site more frequently or to rank it higher.