Why are some webpages not indexed by Google?

Several reasons. The process from publishing → crawling → indexing is not instantaneous and many technical/content issues can block indexing.

Key reasons in 2025:

•“Crawled – currently not indexed” status in Google Search Console—often content quality is low, duplicate, thin, or has no value.

• Pages blocked by robots.txt or meta tags (noindex).

• Poor internal links or isolated pages (no way for Googlebot to reach them).

• Sitemap errors or not submitted.

• Crawl budget issues in large sites—too many low‑value or duplicate pages consume capacity.

What to do (how‑to):

1. Use Google Search Console to see indexing status.

2. Check robots.txt, meta noindex tags.

3. Improve content quality, remove or consolidate duplicate or low‑value pages.

4. Ensure proper internal linking to important pages.

5. Submit an XML sitemap and use URL Inspection tool.

6. Use content or SEO tools to monitor index coverage and errors.

Further reading:

https://www.outrank.so/blog/how-to-fix-crawled-but-not-indexed

https://support.google.com/webmasters/community-guide/354590602/why-isn-t-google-indexing-pages-in-discovered-currently-not-indexed-status?hl=en