By the Lenoretech SEO Strategy Team · Reviewed by a senior SEO strategist · Last updated: June 2026
Technical SEO is the work of optimising your website's foundation - speed, crawlability, indexing, mobile-friendliness, structure and security - so search engines can easily find, understand and trust your pages. Without it, even excellent content struggles to rank. It is the base the rest of SEO stands on. Here is the complete checklist. For context, see the types of SEO and what SEO is.
The technical SEO checklist
| Area | What to check |
|---|---|
| Crawlability | Robots.txt and internal links let Google reach every page |
| Indexing | Important pages are indexed; thin or duplicate pages are not |
| Site speed | Fast load times, optimised images and code |
| Core Web Vitals | Good LCP, INP and CLS scores |
| Mobile-friendliness | Responsive design that works on every device |
| HTTPS | A secure certificate across the whole site |
| XML sitemap | Submitted to Google Search Console |
| Canonical tags | Prevent duplicate-content confusion |
| Structured data | Schema markup for rich results |
| Site architecture | Logical structure, no orphan pages, clean URLs |
Speed and Core Web Vitals
Page speed is both a ranking factor and a conversion factor - slow sites lose rankings and customers. Google measures real-world experience through Core Web Vitals, so fast, stable, responsive pages are essential. A well-built website bakes this in from the start.
Structured data (schema)
Schema markup helps Google understand your content and can earn rich results - star ratings, FAQs and more - that lift click-through. See practical examples in our schema markup guide. It also helps you get cited by AI search; see our GEO guide.
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The foundation for everything else
Technical SEO is what lets your on-page content and off-page authority actually rank. If Google cannot crawl, index or load your site well, nothing else works. To find and fix issues, start with a free technical SEO audit.