Technical SEO Checklist: 50 Points for 2025

Technical SEO is the backbone of every high-performing website. Without a solid technical foundation, even the best content and strongest backlinks won't deliver the rankings you deserve. This checklist covers 50 essential points, organized by category, to help you audit and improve your site's technical health.

Crawlability & Indexability

1. Robots.txt: Ensure your robots.txt doesn't block important pages or resources. Use SEB Sentinel to validate.
2. XML Sitemap: Submit an up-to-date XML sitemap to Google Search Console and Bing Webmaster Tools.
3. Sitemap Accuracy: Only include canonical, indexable pages with 200 status codes in your sitemap.
4. Crawl Budget: For large sites (10k+ pages), monitor crawl stats in Search Console and eliminate crawl waste.
5. Meta Robots Tags: Review noindex, nofollow tags — ensure they're intentional and not blocking important pages.
6. Canonical Tags: Every page should have a self-referencing canonical tag. Cross-domain canonicals should be used sparingly.
7. Pagination: Implement proper pagination with rel="next"/rel="prev" or use infinite scroll with crawlable links.
8. Orphan Pages: Use SEB Sentinel's crawl to identify pages with no internal links pointing to them.

Site Speed & Core Web Vitals

9. Largest Contentful Paint (LCP): Target under 2.5 seconds. Optimize hero images, server response times, and render-blocking resources.
10. Interaction to Next Paint (INP): Target under 200ms. Minimize JavaScript execution time and break up long tasks.
11. Cumulative Layout Shift (CLS): Target under 0.1. Set explicit width/height on images and ads, and avoid injecting content above the fold.
12. Server Response Time (TTFB): Aim for under 800ms. Use a CDN, enable server-side caching, and optimize database queries.
13. Image Optimization: Serve images in WebP/AVIF format, use responsive sizing, and implement lazy loading for below-the-fold images.
14. JavaScript Optimization: Defer non-critical scripts, code-split large bundles, and remove unused JavaScript.
15. CSS Optimization: Inline critical CSS, defer non-critical stylesheets, and purge unused CSS rules.
16. Compression: Enable Gzip or Brotli compression on your server for all text-based assets.

Mobile & Responsiveness

17. Mobile-First Indexing: Ensure your mobile version has the same content, structured data, and metadata as desktop.
18. Responsive Design: Test on multiple screen sizes. Use Chrome DevTools or SEB PageScore's mobile preview.
19. Tap Targets: Buttons and links should be at least 48x48px with adequate spacing between them.
20. Viewport Meta Tag: Include <meta name="viewport" content="width=device-width, initial-scale=1"> on every page.
21. Font Legibility: Use a minimum 16px base font size for body text on mobile devices.

URL Structure & Architecture

22. URL Format: Use short, descriptive, lowercase URLs with hyphens. Avoid parameters, underscores, and uppercase characters.
23. HTTPS: Serve all pages over HTTPS. Redirect HTTP to HTTPS with 301 redirects.
24. WWW Consistency: Choose www or non-www and redirect the other. Ensure consistency across internal links.
25. Trailing Slashes: Be consistent — either always use trailing slashes or never. Redirect inconsistencies.
26. Internal Linking: Build a logical hierarchy with clear internal link paths from homepage to deep pages.
27. Breadcrumbs: Implement breadcrumb navigation with proper Schema.org markup for better SERP display.
28. 404 Pages: Customize your 404 page with navigation links, search, and popular content suggestions.

Structured Data & Schema

29. Organization Schema: Add Organization markup on your homepage with logo, social profiles, and contact info.
30. Breadcrumb Schema: Mark up breadcrumbs with BreadcrumbList schema for rich snippets.
31. Article Schema: Use Article or BlogPosting schema on content pages with headline, author, datePublished, and image.
32. FAQ Schema: Add FAQPage markup to pages with Q&A content to earn rich results.
33. Product/Review Schema: If applicable, add Product, Review, or AggregateRating schema for rich snippets.
34. Validation: Test all structured data with Google's Rich Results Test and fix any errors.

Security & Accessibility

35. SSL/TLS: Use TLS 1.2 or higher. Check for mixed content issues (HTTP resources on HTTPS pages).
36. Security Headers: Implement Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, and Strict-Transport-Security.
37. Alt Text: Every meaningful image should have descriptive alt text for both accessibility and image SEO.
38. Heading Hierarchy: Use a single H1 per page, followed by logical H2–H6 subheadings.
39. ARIA Labels: Add proper ARIA labels to interactive elements for screen reader compatibility.
40. Color Contrast: Ensure text meets WCAG 2.1 AA contrast ratios (minimum 4.5:1 for normal text).

International SEO

41. Hreflang Tags: Implement hreflang tags for multilingual or multi-regional sites. Include x-default for the fallback.
42. Language Declarations: Set the correct lang attribute on the <html> element.
43. Geo-Targeting: Use Google Search Console's International Targeting settings if you target specific countries.

Monitoring & Maintenance

44. Regular Crawls: Schedule automated crawls with SEB Sentinel at least monthly to catch new issues.
45. Log File Analysis: Review server logs to understand how search engine bots are crawling your site.
46. Broken Links: Monitor for 404 errors and broken internal/external links. Fix or redirect as needed.
47. Redirect Chains: Eliminate redirect chains (A → B → C). Each redirect should go directly to the final URL.
48. Duplicate Content: Use SEB Sentinel to identify duplicate or near-duplicate pages and consolidate with canonicals.
49. Page Experience: Monitor Core Web Vitals monthly using SEB PageScore and Google Search Console.
50. Search Console Alerts: Regularly check Search Console for manual actions, security issues, and indexing errors.

Automate Your Technical Audits

Going through this checklist manually every month is time-consuming. SEB Sentinel automates the process — crawling your site, identifying issues, prioritizing them by impact, and tracking fixes over time. Combined with SEB PageScore for page-level analysis, you'll have complete coverage of your site's technical health.

Start your first free audit today with GrowSEB and see exactly where your site stands.