Technical SEO Audit: How to Find What Most People Miss

A technical SEO audit is a deep-dive inspection of your website’s infrastructure. It looks at the code, server configuration, and site architecture to make sure search engine bots can crawl, render, and index your pages without running into problems. This has nothing to do with keywords or content quality. You are checking the foundational mechanics: broken redirects, Core Web Vitals, sitemap errors, crawl blocks. The stuff that sits underneath everything else and quietly decides whether your content gets found or not.

Most people skip the technical audit and jump straight to content. That is a mistake. You can publish excellent articles every week and see almost no organic growth if the technical foundation is broken. The two things work together. This guide covers what to check, in what order, and what to do when you find problems.

Start With Google Search Console

Before you use any paid tool, open Google Search Console. This is free, it is connected to Google directly, and it will tell you about problems that actually matter to your rankings rather than problems that tools flag but Google ignores.

Check the Coverage report first. Look for pages marked as Errors or Excluded. Errors are pages Google tried to index but could not. Excluded pages include ones you intentionally blocked and ones Google chose not to index for its own reasons. Both categories need review.

Common errors here include server errors where the page returned a 5xx response, redirect errors where a chain is broken, and submitted URLs blocked by robots.txt. Each of these has a different fix and a different level of urgency.

Also check the Core Web Vitals report. This shows you which pages are failing Google’s page experience benchmarks for Largest Contentful Paint, Cumulative Layout Shift, and Interaction to Next Paint. Pages with poor scores are at a disadvantage in competitive search results.

Check Your robots.txt File

Your robots.txt file tells search engines which parts of your site they can and cannot access. Go to yourdomain.com/robots.txt and read it carefully.

The most damaging technical SEO mistake you can make is accidentally blocking your entire site or your most important pages from being crawled. This happens more often than you would expect, usually after a site migration or a plugin update that overwrites the file.

Make sure your robots.txt is not disallowing the pages you want indexed. If you see “Disallow: /” that means nothing can be crawled. Everything should be accessible unless you have a specific reason to block it.

Audit Your XML Sitemap

Your XML sitemap is a map you provide to search engines showing them all the pages you want indexed. Check that it exists at yourdomain.com/sitemap.xml and that it has been submitted to Google Search Console.

Look at what is in it. Does it include all your important pages? Does it include any pages you do not want indexed, like thank you pages or admin pages? Does it include URLs that return 404 errors or redirect to other pages?

A clean sitemap contains only the canonical, indexable pages you want Google to find. Remove anything else.

Check for Crawl Issues and Broken Links

Use a tool like Screaming Frog (free up to 500 URLs) or Ahrefs Site Audit to crawl your site and identify broken links, redirect chains, and missing pages.

Broken internal links send both visitors and search engine bots to dead ends. Every 404 error on a page that should exist is wasted link equity and a poor user experience. Fix them by either restoring the page, redirecting to the most relevant existing page, or removing the link entirely.

Redirect chains are sequences of redirects where page A redirects to page B which redirects to page C. Each hop loses a small amount of link equity and slows the page down for visitors. Flatten chains where possible so A redirects directly to C.

Check Page Speed on Mobile

Google uses mobile-first indexing, which means it primarily uses the mobile version of your site for ranking decisions. If your site is slow on mobile, it is hurting your rankings regardless of how fast it is on desktop.

Run your most important pages through Google PageSpeed Insights. Look at the mobile score and the specific recommendations. The most common issues on WordPress sites are unoptimised images, render-blocking JavaScript from plugins, and no caching configured.

Compress all images before uploading. Install a caching plugin like LiteSpeed Cache or WP Rocket. Reduce the number of plugins you are running, especially ones that add JavaScript to every page.

Check Your Canonical Tags

Canonical tags tell search engines which version of a page is the definitive one when multiple URLs show the same or similar content. Without them, Google may split ranking signals between URL variants and rank none of them well.

Common canonical issues include pages accessible at both www and non-www versions, pages accessible with and without a trailing slash, and category or tag archive pages that duplicate content from posts.

On WordPress, Yoast SEO or Rank Math handles canonical tags automatically for most cases. Check that the plugin is active and configured correctly, and spot check a few pages by viewing the page source and searching for rel=”canonical”.

Check Your Internal Link Structure

Internal links pass authority from page to page within your site. Pages with many internal links pointing to them tend to rank better than orphaned pages with no internal links.

Run a crawl and identify orphaned pages. articles that have no internal links pointing to them at all. These pages are effectively invisible to search engines regardless of how good their content is.

For each important article, make sure at least two or three other pages on your site link to it. Use descriptive anchor text that includes relevant keywords where it reads naturally.

What to Fix First

Not everything you find in a technical audit needs immediate attention. Prioritise in this order:

Fix anything that prevents Google from accessing or indexing your most important pages. robots.txt blocks, noindex tags on the wrong pages, and server errors come first.

Fix broken links and redirect chains next. These are relatively quick to address and have a direct impact on crawl efficiency and user experience.

Address page speed issues after that, focusing on mobile performance and Core Web Vitals.

Everything else. canonical refinements, schema markup, log file analysis. comes after the fundamentals are solid.

A technical SEO audit is not a one-time task. Run one every quarter, or whenever you make significant changes to your site. The goal is not to find problems. The goal is to make sure nothing is quietly preventing your content from being found.