Tool
Page Indexing report (Google Search Console)
Google · Google Search Console Help Free Beginner
You cannot fix indexing mistakes you cannot see, and this free tool from Google shows you exactly which of your pages are indexed and why the rest are not. Every founder with a website should set up Search Console on day one, the Page Indexing report surfaces most of the errors in the other two resources for you, with Google's own reason attached to each excluded page. Start here before paying for any SEO tool.
- It is free, official, and shows the real reasons your pages are excluded (noindex, redirect, crawl error, duplicate) instead of leaving you to guess.
- Pair it with the URL Inspection tool to test any single page and ask Google to recrawl it after you fix an issue.
- Not every URL needs to be indexed, duplicates and alternates staying out is normal, so read the reasons before panicking about the excluded count.