A technical SEO audit is a systematic evaluation of a website's infrastructure, crawlability, indexability, and performance — the foundation that all content and link-building efforts sit on. If the technical foundation is broken, even the best content won't rank.

What It Covers

Crawlability: can search engines access and crawl every important page? Issues: blocked by robots.txt, orphan pages, crawl budget waste on low-value URLs. Indexability: are the right pages indexed? Issues: noindex tags on important pages, canonical errors, duplicate content. Site architecture: is the internal linking structure logical? Issues: pages more than 3 clicks from the homepage, broken internal links, flat vs. hierarchical structure. Performance: Core Web Vitals, page speed, mobile usability. Security: HTTPS, mixed content warnings. Structured data: schema markup validation, coverage gaps.

Tools

Screaming Frog, Sitebulb, Ahrefs Site Audit, SEMrush Site Audit, Google Search Console, and PageSpeed Insights are standard. Enterprise sites also use Lumar (formerly Deepcrawl) and Botify.

Frequency

A full technical audit should be conducted at least quarterly, with continuous monitoring for critical issues (sudden indexation drops, crawl errors, 5xx server errors). Major site migrations, redesigns, and CMS changes require a dedicated pre- and post-launch audit.

AI Crawler Considerations

Technical SEO now extends to AI crawler access. Is GPTBot allowed in robots.txt? Is LLMs.txt implemented? Are AI crawlers being served the same content as Googlebot? The technical audit should include an AI Crawler Allowlist review.