Technical SEO Checklist 2026: 40 Things to Check

Technical SEO is the foundation that every other SEO effort relies on. You can have the best content on the internet — but if Googlebot can't crawl it, your pages load in six seconds, or your HTTPS is misconfigured, you won't rank. This checklist covers 40 technical checks across five categories. Use it for quarterly audits or after any major site change.

What is technical SEO?

Technical SEO covers everything about your website that affects how search engines crawl, index, and render it — independent of your content or links. It includes your site's structure, speed, security, mobile compatibility, and the machine-readable signals you send to search engines (sitemaps, structured data, canonical tags). In 2026, technical SEO also encompasses AEO readiness: whether your pages are structured for AI-generated answer extraction.

Crawlability and indexability checklist

If Google can't find or index your pages, nothing else matters. Check these first.

Site speed checklist

Google uses Core Web Vitals as a ranking signal. Pages that load slowly lose rankings and users. Target these benchmarks on both desktop and mobile.

Mobile and UX checklist

Google indexes mobile-first. Your mobile experience determines your rankings across all devices — not the desktop version.

Structured data checklist

Structured data (JSON-LD schema) makes your pages eligible for rich results in Google and for citations in AI Overviews, Perplexity, and ChatGPT. This is now a core technical SEO requirement — not an optional enhancement. See our full SEO audit guide for how to implement and test each schema type.

Security checklist

Security is part of technical SEO. Google factors HTTPS and safe browsing into rankings. Missing HTTP security headers reduce your trust score and signal to crawlers that the site isn't hardened. These 8 checks are scored in every VisRank security audit.

How to prioritise technical SEO fixes

Not all technical issues have equal impact. Prioritise in this order: crawl blocks (robots.txt, noindex) first — they prevent any ranking at all. Then HTTPS and security issues. Then Core Web Vitals. Then structured data for rich result eligibility. Finally, mobile UX refinements. The VisRank score breakdown shows exactly which category is dragging your overall score down. Run a free technical SEO audit →

Key takeaways

• Fix crawl and index issues before any content or link work — they're blocking everything else
• Core Web Vitals (LCP, CLS, INP) are ranking signals — measure them on mobile, not just desktop
• Google indexes mobile-first — your mobile experience determines your rankings
• Structured data is now required for AI Overview citations, not just rich results
• Security headers affect your trust score and are checked in modern SEO audits
• Run this checklist after every major site change, not just quarterly
• Automated audits catch what manual checks miss — use both for full coverage