Technical SEO

What does technical SEO cover?

Google sets three minimum requirements for a page to be eligible for indexing. Googlebot must not be blocked, the page must return an HTTP 200 status code, and it must contain indexable content. Google adds that meeting these requirements does not guarantee indexing.

Beyond that, technical SEO usually includes:

• Crawl control: robots.txt, XML sitemaps, crawlable links, clean URL parameters.
• Index control: noindex, canonical tags, handling of duplicate content.
• Status codes and redirects: 301 for permanent moves (Google treats the target as the canonical candidate), 302 for temporary ones, real 404 responses for removed pages instead of soft 404s.
• Rendering: Google renders pages with an evergreen, continuously updated version of Chromium. Content generated by JavaScript has to appear in that rendered version.
• Internationalization: hreflang and a clear URL structure for language and country versions.
• Page experience: load time, Core Web Vitals, mobile display, HTTPS.
• Structured data that helps search engines classify content such as products or events.

The line to on-page SEO is blurry. Title tags and meta descriptions are assigned to one or the other depending on who you ask.

Why technical SEO needs ongoing attention

Websites change all the time. A deployment overwrites a robots.txt rule, a template bug adds noindex to thousands of pages, a new filter module creates millions of parameter URLs. Such errors often surface only after rankings or traffic have dropped. Many teams therefore crawl their site regularly and compare each crawl with the previous one.

The same foundation applies to AI search. Google says there are no additional technical requirements for AI Overviews and AI Mode. A page has to be indexed and eligible for a snippet. What Google cannot crawl or index is also missing as a source in those answers.

Example

After a relaunch, old category URLs all redirect to the homepage instead of matching new pages. A crawl shows hundreds of redirects to the same URL. The fix is a 301 redirect from each old URL to its counterpart:

# old URL → new URL, permanent
/women/shoes/sneakers/   301 → /shoes/women/sneakers/

Checklist

• Pages meant for search are not blocked for Googlebot, neither by robots.txt nor by a login.
• These pages return a 200 status code and contain indexable content.
• Removed pages return 404 or 410, not an error page with status 200.
• Pages with noindex are not disallowed in robots.txt, otherwise Google never sees the rule.
• Permanent moves use server-side 301 or 308 redirects that point straight to the matching target.
• Internal links are <a> elements with an href attribute.
• The URL Inspection tool in Search Console shows important content and links in the rendered HTML.
• Staging and test environments are password-protected.

FAQ

What are the main types of SEO? The usual split is technical SEO, on-page SEO (content and structure of individual pages) and off-page SEO (mainly links from other sites). Local SEO is a common specialty.

Does every website need technical SEO? Every site has to meet Google’s minimum requirements. For a small site on a standard CMS that is often quick. Large stores and portals with many templates, filters and language versions have far more technical failure points.

Last updated: October 8, 2026