Comprehensive Technical SEO Problems Checklist 2025

Introduction

At PEAKONTECH, a data-driven digital marketing agency, we’ve compiled this Comprehensive Technical SEO Problems Checklist for 2025 to help webmasters, SEOs, and developers identify critical site issues that impact visibility, indexing, and performance. This expert-curated list highlights 55 of the most common and emerging technical SEO challenges—from crawlability errors and Core Web Vitals to AI-focused structured data gaps—so you can ensure your site stays search-engine friendly in the evolving digital landscape.

Website Crawlability Issues

1. Blocked important pages in robots.txt – Search engines can’t access key content.
2. Pages incorrectly marked with noindex – Prevents important pages from being indexed.
3. Broken internal links (404 errors) – Links pointing to missing pages hurt UX and crawlability.
4. Orphan pages – Pages with no internal links; hard for bots to find.
5. Misused or conflicting canonical tags – Confuses search engines about preferred versions.
6. Redirect chains or loops – Multiple redirects waste crawl budget and slow loading.
7. Soft 404 errors – Empty pages returning a 200 status instead of a 404.
8. “Discovered – Not Indexed” pages – Pages found but not indexed due to low value or crawl issues.
9. Sitemap URLs ignored – Submitted URLs not indexed, often due to duplicates or low priority.

Site Structure and URL Optimization

10. Poor or unreadable URL structure – Non-descriptive URLs harm SEO and UX.
11. Duplicate URLs with/without trailing slashes – Creates unnecessary copies of content.
12. HTTP/HTTPS accessible URLs without redirection – Causes duplicate content.
13. www and non-www accessible URLs – Splits authority across two versions.
14. Missing or outdated XML sitemap – Reduces crawl efficiency.
15. Missing breadcrumb navigation/schema – Hurts internal linking and rich results.

JavaScript and Dynamic Content Issues

16. JS-rendered content not crawlable – Bots can’t see dynamically loaded content.
17. Hidden tab/accordion content not loaded for bots – Key info may not be indexed.
18. No dynamic rendering for JS-heavy sites – Limits visibility in search results.
19. Event-based content hidden from bots – Interactions like buttons hide SEO-critical info.

Page Speed and Performance (2025)

20. Slow mobile page load time – Harms rankings and user experience.
21. Unoptimized images and large files – Slows down page speed.
22. Excessive JavaScript – Increases load time and resource usage.
23. Third-party scripts delaying LCP – Metrics impacted by ads or analytics tools.
24. CLS from ads or images – Page elements shifting unexpectedly.
25. Missing width/height attributes – Triggers layout instability.
26. INP above Google thresholds – Poor responsiveness affects Core Web Vitals.
27. No lazy loading on media – Slows down initial load times.

Mobile Usability and UX

28. Mobile usability errors in Search Console – Breaks layout or functionality on mobile.
29. Incorrect or missing viewport settings – Poor mobile rendering.
30. Clickable elements too close together – Frustrates mobile users.
31. Horizontal scrolling – Bad design causes difficult navigation.
32. Interstitials blocking content – Hurts UX and potentially SEO.

Indexing and Content Quality

33. Important pages not indexed – Missed visibility in search engines.
34. Duplicate or near-duplicate content – Confuses ranking signals.
35. Thin/low-value content – Offers little benefit to users or SEO.
36. H1 tag issues – Missing or irrelevant headings reduce clarity.
37. Meta tag problems – Duplicate or unoptimized titles/descriptions.
38. Pagination issues – Poor linking between paginated series.
39. Supplemental index pages – Content indexed but deemed low priority.

Structured Data and AI/SGE Optimization

40. Missing structured data – No support for enhanced SERP features.
41. Invalid schema markup – Errors prevent rich results.
42. Broken Open Graph/Twitter Cards – Poor link previews on social.
43. Weak entity optimization – No clear context about topics or brands.
44. Weak E-E-A-T signals – Lacks authority, expertise, and trust.
45. Missing transcripts or markup for media – Video/audio content not accessible or indexable.

Security, Privacy, and Compliance

46. No HTTPS or expired SSL – Site seen as insecure.
47. Mixed content warnings – HTTPS pages load insecure assets.
48. Cookie banners block bots – Crawlers can’t access content.
49. Misconfigured security headers – Reduces trust and compliance.
50. Bot blocking via CAPTCHA/JS – Prevents crawling.
51. High TTFB due to DNS/server issues – Slows down initial page load.

International and Multilingual SEO

52. Incorrect **** tags – Misleads search engines on language.
53. Broken hreflang or targeting conflicts – Confuses region/language targeting.
54. Machine-translated content – Poor quality translations affect trust and ranking.
55. No canonicalization across regions – Duplicate content issues in global sites.