Technical SEO in 2026 goes beyond the basics of sitemaps and robots.txt. With Core Web Vitals as a confirmed ranking factor, AI crawlers accessing your content, and structured data becoming essential for rich results, here's what your technical SEO checklist should include.
Core Web Vitals remain critical. Target LCP under 1.5 seconds, CLS below 0.05, and TTFB under 200ms. These aren't just SEO metrics. They directly impact conversion rates and user experience.
Structured data is no longer optional. Implement JSON-LD schema markup for your organisation, services, FAQ pages, articles, and breadcrumb navigation. This helps both traditional search engines and AI models understand your content.
Create an llms.txt file (similar to robots.txt) that provides structured information about your business for AI crawlers. This emerging standard helps LLMs accurately represent your brand.
Ensure your site is fully crawlable by both traditional search engine bots and AI crawlers. Check your robots.txt for overly restrictive rules, ensure your sitemap.xml is complete and up-to-date, and verify that your internal linking structure allows crawlers to discover all important content.
Security headers matter more than ever. Implement HSTS, Content Security Policy, X-Frame-Options, and other security headers. Google has indicated that site security is a ranking consideration.
Finally, conduct regular technical audits. Set up automated monitoring for Core Web Vitals, broken links, and crawl errors. Technical SEO is not a one-time project. It's an ongoing discipline.
