Technical SEO
Technical SEO refers to optimisations that make a website easier for search engine crawlers to access, crawl, interpret, and index — covering speed, mobile-friendliness, structured data, and crawlability.
Reviewed by Alexander Yarovenko · Updated: 2026-06-22
What is Technical SEO?
Technical SEO is the branch of search engine optimisation focused on improving the technical aspects of a website to help search engine crawlers access, crawl, render, and index your content more effectively. While content and links are about what to rank, technical SEO is about removing barriers to that ranking.
Core Technical SEO Areas
| Area | Key elements |
|---|---|
| Crawlability | robots.txt, crawl budget, internal linking, sitemap |
| Indexability | noindex, canonical tags, URL parameters, pagination |
| Site speed | Core Web Vitals, image optimisation, CDN, server response |
| Mobile-friendliness | Responsive design, mobile-first indexing compliance |
| Site architecture | URL structure, click depth, information hierarchy |
| Structured data | Schema.org markup, JSON-LD, rich results eligibility |
| Security | HTTPS, SSL certificate, no malware |
| Internationalisation | hreflang tags, geo-targeting, language routing |
Technical SEO Audit Steps
- Crawl the site with Screaming Frog — identify broken links, duplicate content, missing tags
- Check Google Search Console — Coverage report, Core Web Vitals, manual actions
- Test page speed — PageSpeed Insights for Core Web Vitals
- Verify indexation — site:yourdomain.com in Google to see what's indexed
- Check robots.txt and sitemap — ensure important pages aren't accidentally blocked
- Validate structured data — Google Rich Results Test
- Test mobile usability — Google Mobile-Friendly Test
Technical SEO vs On-Page SEO
Technical SEO ensures search engines can access and understand your content. On-page SEO ensures that content is worth ranking. Both must work together — excellent on-page content on a technically broken site won't rank; a technically perfect but thin site also won't rank.