Crawl errors SEO problems are among the most common — and most damaging — technical issues affecting Google rankings. When Googlebot cannot access your pages, they cannot be indexed. Pages that are not indexed cannot rank. Fixing crawl errors SEO issues is one of the fastest ways to recover lost rankings and improve your site’s overall health.
This guide covers every error type, how to find them for free, and exactly what to do to fix each one.
What Are Crawl Errors in SEO?
A crawl errors SEO problem occurs when Googlebot tries to visit a URL on your website and receives an error instead of a valid page. The key insight is that Google can only rank what it can successfully access and index — as explained in Google’s crawlers documentation.
Key insight: Not all crawl errors are equally serious. A 404 on a page you deliberately deleted is fine. A 404 on a page linked from your homepage is a serious problem that needs immediate fixing.
Types of Crawl Errors and Their SEO Impact
Each error type has a different cause, severity, and fix:
| Error Type | Code | What It Means | SEO Severity |
|---|---|---|---|
| Not Found | 404 | Page does not exist at this URL | 🔴 High |
| Server Error | 500+ | Your server crashed or is overloaded | 🔴 Critical |
| Redirect Error | 3xx loop | Redirect chain or loop — never resolves | 🟠 Medium |
| Unauthorized | 401/403 | Page blocked — login or permissions required | 🟡 Depends |
| DNS Error | — | Domain not resolving — hosting issue | 🔴 Critical |
| Soft 404 | 200 | Returns 200 but has no real content | 🟠 Medium |
How to Find Crawl Errors SEO Problems for Free
Use these three free methods to find crawl errors on your site:
Method 1 — Google Search Console
Google Search Console is the primary free tool for diagnosis. It shows real data from Googlebot’s actual crawl:
- Open Google Search Console and select your property
- Click Pages (under Indexing) in the left menu
- Click “Why pages aren’t indexed” to expand error categories
- Click each category to see the specific affected URLs
Method 2 — Seobility SEO Audit Tool
Run a free audit at seobility.org/seo-audit-tool/ — it crawls your entire site and reports all issues: broken links, redirect chains, missing pages, and server errors in one report.
Method 3 — Broken Link Checker
Use Seobility’s Broken Link Checker to quickly find all 404 errors on any specific page.
How to Fix Each Error Type
Fix 404 Crawl Errors
If the page moved: set up a 301 redirect from the old URL to the new URL — this preserves link equity and resolves the ranking impact. If the page is genuinely gone with no replacement: remove it from your sitemap and fix all internal links pointing to it.
Fix Server Errors (5xx)
5xx server errors are critical — contact your hosting provider immediately. Upgrade your hosting plan if the server is overloaded. Check for PHP errors or plugin conflicts in WordPress error logs.
Fix Redirect Chains and Loops
Redirect chains drain crawl budget and block link equity. Ensure every redirect goes directly A → B (not A → B → C → D). Point the old URL straight to the final destination — never redirect to a URL that itself has a redirect.
Fix Soft 404s
Soft 404s look fine to users but signal thin content to Google. Add real, valuable content to thin pages. If they are genuinely empty, delete them and redirect to the nearest relevant page. Remove all soft 404s from your sitemap.
Crawl Budget and Crawl Errors SEO
Google allocates a crawl budget to each website — the number of pages it will crawl per day. For most small sites, crawl budget is rarely a concern. But for large sites (10,000+ pages), this becomes a serious problem: every error Google encounters uses up budget that should be spent on valuable, rankable pages.
Reduce crawl budget waste by: fixing all 404 errors, eliminating redirect chains, blocking unimportant pages in robots.txt, and keeping your XML sitemap clean — only indexable, working pages.
Crawl Errors SEO Fix Checklist
Use this checklist to systematically resolve all issues:
- Check GSC Coverage report weekly for new crawl errors
- 301 redirect all important 404 pages to relevant replacements
- Remove 404 pages from your XML sitemap
- Fix all internal links pointing to 404 pages
- Flatten redirect chains to single-hop redirects
- Remove noindex pages from sitemap
- Add content to or redirect all soft 404 pages
- Run a monthly site audit with Seobility to catch new problems early