Indexing Coverage Diagnosis

Definition

Indexing coverage diagnosis is the process of checking through GSC how well Google indexes your site's pages and fixing problems. Unindexed pages cannot appear in search results and receive no traffic.

Summary

Indexing problem diagnosis order: Check GSC indexing report → identify cause → set priorities → fix → request reindexing. Reindexing requests alone without fixes have no effect.

Problems This Guide Solves

• "My page doesn't show on Google"
• "It's in the sitemap but not indexed"
• "Recent content doesn't appear in search"
• "It was indexed before but suddenly disappeared"

GSC's 4 Indexing Status Categories

[SCREENSHOT: GSC indexing report — counts and reason list by indexing status]

GSC → Indexing → Pages report classifies into four states.

"Crawled — currently not indexed" is the most serious state. Google read the page but judged it not worth indexing.

10 Major Causes of Not Being Indexed

1. noindex tag

Intentional indexing block. <meta name="robots" content="noindex"> or HTTP header X-Robots-Tag: noindex. Common when noindex set in development remains in production.

How to check: URL Inspection → "Not indexed" → reason shows "noindex"

2. robots.txt block

URLs blocked by Disallow in robots.txt are not crawled. See How to Allow AI Bots in robots.txt for details.

How to check: URL Inspection → check "Crawl allowed"

3. Canonical tag error

If your URL points canonical to another URL, Google indexes only the canonical URL. Unintended canonical settings can exclude important pages from indexing.

How to check: URL Inspection → check "User-declared canonical"

4. Soft 404

Pages return HTTP 200 despite being "404 Not Found" status. Google classifies 200 responses with empty content or error messages as soft 404 and rejects indexing.

How to check: URL Inspection → "Crawled — currently not indexed" + "Soft 404"

5. Duplicate content

When content is nearly identical to another page, Google selects one page as "canonical" version for indexing. Others may be excluded as duplicates.

6. Thin content

Valueless short pages, keyword-stuffed pages, auto-generated pages, etc. Classified as unhelpful to people under Helpful Content System. See Helpful Content System for details.

7. Server errors (5xx)

If server returns 5xx, Google abandons crawl and does not index.

How to check: GSC → Settings → Crawl stats → response code distribution

8. Redirect problems

Redirect chains too long (5+ steps) or redirect loops cause indexing problems.

9. Crawl budget shortage

On large sites, insufficient Google crawl allocation means some pages are not crawled. See Crawl Budget for details.

10. Helpful Content penalty

When site-wide content quality signals are low, new pages may not index regardless of individual page quality. See Helpful Content System for details.

5-Step Indexing Coverage Diagnosis

Step 1: Check GSC indexing report

GSC → Indexing → Pages

• Check indexed page count
• Check "Not indexed" reason groups
• Click numbers → see corresponding URL lists

Step 2: Set priorities

Fixing all unindexed pages at once takes too long. Set priorities in this order:

1. Core business pages (service, product, conversion pages)
2. High search volume keyword target pages
3. Recent content (within 3 months of publishing)
4. Site-wide impact issues (server errors, robots.txt, etc.)

Step 3: Individual diagnosis with URL Inspection

GSC → URL Inspection tab, enter URL

Information to check:

• Last crawl time (old = low crawl frequency)
• Crawl allowed (robots.txt block?)
• Indexed? + reason if not
• Rendering screenshot (what Google actually saw)

Step 4: Fix by cause

Step 5: Request reindexing

After fixes: GSC → URL Inspection → click "Request indexing"

Important notes:

• About 10–12 quota per day
• For bulk reindexing, update sitemap instead
• Repeated requests without fixes do not lead to indexing

Recommended Indexing Monitoring Frequency

Quick Index Check with site: Operator

site:example.com

Running this search on Google quickly shows some indexed pages. However, it is a sample, not official Google index data — use GSC for accurate counts. See Google Search Operators for details.

Korean Market Application

Common indexing issues on Korean sites

• m. subdomain separation: m.example.com and example.com operated separately with wrong canonical settings
• Korean CMS auto noindex: Some Korean hosting/CMS auto-set noindex on certain page types (tag pages, search results)
• Korean UTF-8 URLs: Korean characters in URLs can cause crawl errors from encoding issues

Separate Naver indexing check

Indexing in Google GSC does not mean indexing on Naver. Check Naver indexing status separately in Naver Search Advisor. See Naver Search Advisor Registration Guide for details.

Frequently Asked Questions

Q. I requested indexing but it's still not indexed after days. What should I do?
A. "Request indexing" in URL Inspection requests priority crawl, not guaranteed immediate indexing. Google may reject indexing after crawling if content quality is low or technical issues remain. Cause identification must come first.

Q. Indexed page count suddenly dropped. What's wrong?
A. If indexing dropped suddenly, check in order: ①robots.txt changes, ②noindex tag additions, ③server errors, ④Google core update timing. Match dates and causes in GSC indexing report.

Q. Are pages without internal links not indexed?
A. Not necessarily. Inclusion in sitemap gives crawl opportunity. However, without internal links, crawl priority is low — indexing may be delayed or stay in "Discovered — currently not indexed" long.

Q. Why is my site's indexing rate lower than competitors?
A. Domain authority, content quality, internal link structure, crawl budget, and other factors work together. Prioritize identifying your own unindexed causes over competitor analysis.

Q. Why aren't sitemap pages indexed?
A. Sitemap is a crawl guide, not indexing guarantee. Thin content, technical issues (noindex, canonical), crawl budget shortage, etc. can prevent indexing even when in sitemap.

Related Sources

• Google Search Central (2024). Index Coverage report. https://support.google.com/webmasters/answer/7440203
• Google Search Central (2024). Why Google isn't indexing your page. https://developers.google.com/search/docs/crawling-indexing/googlebot
• Google Search Central (2024). Indexing FAQ. https://developers.google.com/search/docs/crawling-indexing/index