Technical SEO Audit Checklist: 31 Critical Issues to Fix in 2025

TL;DR

Technical SEO makes or breaks your rankings. This comprehensive 31-point checklist covers crawlability, indexability, site speed, mobile optimization, structured data, and security. Manual audits take 8+ hours per site. SEOLOGY scans all 31 issues in under 60 seconds and fixes them automatically.

Why Technical SEO Matters More Than Ever

Google's algorithm is more sophisticated than ever. In 2025:

Core Web Vitals are confirmed ranking factors
Mobile-first indexing is the only indexing
Page experience signals influence 40% of rankings
Structured data increases CTR by up to 30%

Technical issues don't just hurt rankings--they make your content invisible to Google.

The Complete Technical SEO Audit Checklist

Crawlability & Indexability (9 Issues)

1. Robots.txt Configuration

Ensure robots.txt doesn't block important pages. Check for accidental disallows.

2. XML Sitemap Quality

Verify sitemap.xml exists, contains all important URLs, excludes noindex pages.

3. Noindex Tag Audit

Identify pages accidentally blocked from indexing with noindex meta tags.

4. Crawl Budget Optimization

Prevent Google from wasting crawl budget on low-value pages (search results, filters).

5. Orphan Pages Detection

Find pages with zero internal links (invisible to crawlers).

6. URL Parameter Handling

Configure how Google treats URL parameters (sorting, filtering, session IDs).

7. Pagination Implementation

Ensure paginated content uses proper rel="next/prev" or view-all pages.

8. JavaScript Rendering

Test if Google can render JavaScript-heavy pages (especially SPAs/React apps).

9. Internal Link Structure

Verify important pages are linked within 3 clicks from homepage.

Site Speed & Performance (7 Issues)

10. Core Web Vitals Compliance

LCP under 2.5s, FID under 100ms, CLS under 0.1 for 75% of visits.

11. Image Optimization

Compress images, use next-gen formats (WebP/AVIF), implement lazy loading.

12. Browser Caching

Set proper cache headers for static resources (images, CSS, JS).

13. Minification & Compression

Minify CSS/JS files, enable Gzip/Brotli compression.

14. Render-Blocking Resources

Defer non-critical JavaScript, inline critical CSS, eliminate render-blocking.

15. Server Response Time

TTFB (Time to First Byte) should be under 600ms.

16. CDN Implementation

Serve static assets from CDN to reduce latency globally.

Mobile Optimization (5 Issues)

17. Mobile-Friendly Design

Responsive layout, readable fonts (16px minimum), no horizontal scroll.

18. Touch Elements Spacing

Tap targets must be at least 48x48px with adequate spacing.

19. Viewport Configuration

Proper viewport meta tag for responsive scaling.

20. Mobile Page Speed

Mobile LCP under 2.5s (mobile is typically 3-4x slower than desktop).

21. Intrusive Interstitials

Avoid popups that block content on mobile (Google penalty).

On-Page Technical SEO (6 Issues)

22. Duplicate Content

Identify and consolidate duplicate pages using canonicals or 301 redirects.

23. Canonical URL Implementation

Every page should specify its canonical URL (self-referencing or to master copy).

24. Hreflang Tags (International Sites)

Properly configure hreflang for multi-language/multi-regional sites.

25. Broken Links & 404 Errors

Find and fix all broken internal/external links, monitor 404 pages.

26. Redirect Chains & Loops

Eliminate redirect chains (A → B → C) and redirect loops.

27. Image Alt Text

All images must have descriptive alt text for accessibility and SEO.

Structured Data & Schema (2 Issues)

28. Schema Markup Implementation

Add structured data for Organization, Article, Product, FAQ, HowTo, etc.

29. Schema Validation

Test schema with Google's Rich Results Test, fix errors/warnings.

Security & HTTPS (2 Issues)

30. HTTPS Implementation

Entire site must use HTTPS (required for Google ranking).

31. Mixed Content Issues

Find and fix all HTTP resources loaded on HTTPS pages.

Manual Audits vs SEOLOGY Automatic Audits

Aspect	Manual Audit	SEOLOGY
Time Required	8-12 hours	Under 60 seconds
Issues Detected	Depends on expertise	150+ issues guaranteed
Fix Implementation	3-7 days	Automatic (instant)
Ongoing Monitoring	Manual re-audits	24/7 continuous
Cost	$500-2,000/audit	$49/month unlimited

How to Run Your Technical SEO Audit with SEOLOGY

1
Connect Your Site:
Link Shopify, WordPress, or custom site in 2 minutes.
2
Run Comprehensive Scan:
SEOLOGY crawls your entire site and audits all 31 technical issues.
3
Review Prioritized Fixes:
See which issues impact rankings most (critical, high, medium, low).
4
Enable Automatic Fixes:
Let SEOLOGY fix issues automatically or approve fixes individually.

Download This Checklist (Free)

Want this 31-point technical SEO audit checklist as a PDF? Get it free when you sign up for SEOLOGY.

Run Your Free Technical SEO Audit

Scan your site for 150+ technical SEO issues in under 60 seconds. Fix them automatically with SEOLOGY.

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Tags: #TechnicalSEO #SEOAudit #SEOChecklist #SEOLOGY #SEO2025