The ultimate technical SEO checklist for 2026
Core Web Vitals, crawl budget, indexing and rendering — everything you need to check so your site performs technically.
Why technical SEO still matters
Content is king, but without a solid technical foundation it never reaches its full potential. Technical SEO is the foundation everything else rests on.
Here's the complete checklist we use at SEOZ for our clients' sites.
Core Web Vitals
- LCP (Largest Contentful Paint): Under 2.5 seconds. Optimize images, use a CDN, and lazy-load below-the-fold content.
• INP (Interaction to Next Paint): Under 200ms. Minimize JavaScript execution and use web workers for heavy computation.
• CLS (Cumulative Layout Shift): Under 0.1. Set explicit dimensions on images and embeds, avoid dynamically injected content.
Crawling & Indexing
Verify that robots.txt doesn't block important resources. Review your XML sitemap — it should only contain indexable, canonical URLs. Check crawl budget with GSC's crawl stats. Find and fix orphan pages.
Rendering & JavaScript
Test how Googlebot renders your pages with the URL Inspection Tool. Make sure critical content doesn't require JavaScript to appear. Implement SSR or SSG for Next.js sites.
Structured Data
Implement the relevant schema types (Article, Product, FAQ, HowTo). Validate with Google Rich Results Test. Monitor schema errors in GSC.
Use SEOZ AuditWizard to automatically scan every item above and prioritize fixes by impact.