A technical SEO audit examines the foundations of a website. It asks whether search engines can crawl the site, understand its structure, index the right pages and deliver a good experience to users. If technical problems are severe, even excellent content may struggle to perform.
Technical SEO can sound intimidating, but the purpose is simple: remove friction. Search engines should find important pages easily. Users should load them quickly. Tracking should work. Duplicate or low-value pages should not waste crawl attention. A good audit turns hidden problems into a clear action plan.
Crawlability
Crawlability is about whether search engines can access your pages. An audit reviews robots.txt, nofollow links, blocked resources, server errors, redirect chains and internal link structure. Important pages should be reachable through normal links, not only through search forms or scripts.
Orphan pages are a common issue. These pages exist but have no internal links pointing to them. Search engines may find them through a sitemap, but they receive weak internal signals. Every important page should sit within a clear site structure.
Indexation
Indexation is about which pages search engines store and show. Not every page should be indexed. Thank-you pages, internal search results, duplicate filters, thin tag pages and staging URLs can create index bloat. An audit checks whether the right pages are indexable and whether low-value pages are controlled.
Canonical tags, meta robots directives and sitemap entries should agree. When a page says one thing in the canonical tag and another in the sitemap, search engines receive mixed signals. Consistency is a major part of technical SEO.
Site architecture
A strong architecture helps users and crawlers understand importance. Key pages should be easy to reach from the homepage and main navigation. Categories should be logical. Breadcrumbs should show hierarchy. Internal links should guide both people and authority toward priority pages.
Deep, messy structures can hide important services. If a money page takes five clicks to reach, it may be undervalued. Flattening architecture and improving internal links often creates quick SEO wins.
Page speed and Core Web Vitals
Speed affects users, conversions and search performance. An audit reviews image sizes, caching, render-blocking files, unused scripts, server response time, font loading and layout shift. The goal is not a perfect score for vanity; the goal is a fast, stable experience on real devices.
Core Web Vitals focus on loading, responsiveness and visual stability. Common fixes include compressing images, setting width and height attributes, reducing heavy third-party scripts, deferring non-critical JavaScript and improving hosting where needed.
Mobile experience
Search engines primarily evaluate the mobile version of a site. A technical audit checks mobile navigation, readable text, tap target spacing, content parity and form usability. If important desktop content disappears on mobile, rankings may suffer.
Mobile users also convert differently. Phone links, shorter forms, clear buttons and fast loading are especially important for service businesses.
Duplicate content and cannibalisation
Duplicate content happens when similar pages compete or when the same content appears through several URLs. Cannibalisation happens when multiple pages target the same keyword intent. Both issues dilute signals and confuse search engines.
An audit identifies duplicates, near-duplicates, parameter URLs, printer versions, tag pages and overlapping service pages. The solution may involve merging, redirecting, canonicalising or rewriting pages so each has a unique purpose.
Status codes and redirects
Status codes tell browsers and crawlers what happened to a URL. A healthy site should use 200 for live pages, 301 for permanent redirects, 404 or 410 for removed pages and avoid redirect chains where possible. Too many hops slow crawling and create poor user experience.
During redesigns or migrations, redirect mapping becomes critical. Old URLs with backlinks or rankings should be redirected to the closest relevant new page. Losing this mapping can erase years of SEO value.
Structured data
Structured data helps search engines understand page entities and content type. Article, FAQ, Breadcrumb, LocalBusiness, Product and Review schema can be useful when accurate. An audit checks whether schema is valid, relevant and visible on the page.
Misleading schema is risky. Mark up only content that users can actually see. Structured data should reinforce clarity, not hide claims in code.
Security and trust signals
HTTPS should be active across the entire site. Mixed content, expired certificates and insecure forms damage trust. Security headers, spam protection and careful form handling also matter for production readiness.
Trust is not only technical, but technical issues can undermine it quickly. A user who sees browser warnings or broken forms is unlikely to enquire.
Analytics and tracking
A technical audit should confirm that analytics, conversion tracking and search tools are installed correctly. If forms, phone clicks or purchases are not tracked, it becomes hard to judge SEO performance. Data quality affects decision quality.
Make sure filters, consent settings and duplicate tracking are reviewed. Inflated or missing data can lead to poor strategy decisions.
The audit output
A good audit should not be a giant document with no priorities. It should rank issues by impact, effort and risk. Critical crawl or index problems come first. Speed and template improvements follow. Content and internal linking recommendations should connect to the keyword strategy.
Technical SEO gives every other SEO activity a stronger foundation. If you want to know what is holding your website back, request a free technical SEO audit.