How to Perform a Technical SEO Audit Step by Step

Yet most businesses either skip the audit entirely, run a surface-level check using a free tool, or receive an audit report from an agency that lists hundreds of issues without telling them which ones actually matter. The result is either inaction or effort spent fixing low-priority problems while critical issues remain unresolved.

This guide gives you a complete, step-by-step technical SEO audit framework — covering every major audit area in priority order, explaining what to look for, which tools to use, and exactly how to fix the issues you find.

What Is a Technical SEO Audit and Why Does It Matter?

A technical SEO audit is a systematic evaluation of all the technical factors that affect how search engines discover, access, interpret, and rank your website. Unlike on-page SEO (which focuses on content) or off-page SEO (which focuses on authority), technical SEO focuses on the infrastructure that underpins everything else.

Even the best content, written with perfect keyword optimisation and backed by hundreds of quality backlinks, will underperform if technical issues prevent Google from properly accessing and understanding your pages. Technical SEO is the foundation — and a cracked foundation limits how high you can build.

A thorough technical SEO audit addresses all three areas — in that priority order. Fixing crawlability issues first ensures your subsequent work is not wasted on pages Google cannot reach. Fixing indexability next ensures crawled pages actually appear in search results. Fixing rankability signals last maximises the competitive performance of indexed pages.

Tools You Will Need for a Technical SEO Audit

You do not need every tool listed here — but you do need the right combination for your audit scope. Google Search Console is the only non-negotiable; it provides data directly from Google and is completely free.

Tool	Cost	Best For
Google Search Console	Free	Crawl coverage, indexing status, Core Web Vitals, manual actions, search performance — the essential starting point for every audit.
Google PageSpeed Insights	Free	Core Web Vitals scores, page speed metrics, and specific optimisation recommendations for desktop and mobile.
Screaming Frog SEO Spider	Free/Paid	Full site crawl — broken links, redirect chains, duplicate content, missing meta tags, response codes, and crawl depth.
Ahrefs Site Audit	Paid	Automated technical audit with issue prioritisation, historical tracking, and integration with backlink and keyword data.
Semrush Site Audit	Paid	Comprehensive crawl with categorised issues, Core Web Vitals integration, and scheduled re-crawling.
GTmetrix	Free/Paid	Detailed page speed analysis with waterfall charts, historical tracking, and specific recommendations.
Bing Webmaster Tools	Free	Secondary crawl data, backlink insights, and keyword performance from Bing — useful supplement to Search Console.
Chrome DevTools	Free	On-page technical inspection — network requests, JavaScript rendering, console errors, and mobile simulation.

The 10-Step Technical SEO Audit Framework

Work through these ten audit areas in order. Each step builds on the findings of the previous one, and the priority order ensures you address the most impactful issues first.

The first step in any technical SEO audit is running a full crawl of your website using a dedicated crawl tool. This gives you a complete picture of what exists on your site — including pages you may not know about — and identifies the most common technical issues across all pages simultaneously.

• Open Screaming Frog (or Ahrefs/Semrush Site Audit) and enter your root domain
• Let the crawl complete fully — for large sites this may take hours
• Record total pages crawled, number of pages with errors, and top-level issue categories
• Export the full crawl data to a spreadsheet — this is your audit working document
• Cross-reference the crawl data with your XML sitemap — are all important pages being crawled?
• Note any pages being crawled that should not be — staging pages, admin pages, duplicate parameter URLs
• Compare crawl page count to your Google Search Console index coverage count — significant discrepancies need investigation

Before Google can index or rank any page, it must first be able to crawl it. The two most common technical barriers to crawlability are misconfigured robots.txt files and missing or incorrect XML sitemaps. These issues are easy to introduce accidentally and can have catastrophic consequences if left undetected.

• Access your robots.txt file at yourdomain.com/robots.txt — review every Disallow rule carefully
• Use Google Search Console’s robots.txt tester to check for accidental blocks on important pages
• Verify your XML sitemap exists at yourdomain.com/sitemap.xml and is submitted in Search Console
• Check that your sitemap only includes pages you want indexed — remove redirected, noindex, and canonical URLs from the sitemap
• Ensure all sitemap URLs return a 200 HTTP status code — not 301, 404, or 500
• Verify sitemap lastmod dates are accurate — outdated dates can reduce crawl frequency
• If your site has multiple sitemaps, ensure they are all listed in a sitemap index file
• Check that your sitemap is being read by Google: Search Console > Sitemaps > check status and last read date

Being crawled and being indexed are different things. A page that is crawled but excluded from Google’s index will never appear in search results. The Index Coverage report in Google Search Console is your primary tool for diagnosing indexing issues at scale.

• Open Search Console > Index > Pages and review the breakdown of indexed vs not indexed URLs
• Investigate every category of excluded pages — understand why each group is excluded
• Check for accidental noindex meta tags: in Screaming Frog, filter by ‘Noindex’ in the Directives column
• Review pages excluded as ‘Crawled — currently not indexed’ — these pages were visited but Google chose not to index them, often due to thin or duplicate content
• Check for canonical tag issues — ensure canonical tags point to the correct, preferred URLs
• Identify orphaned pages with no internal links — these may be crawled but signal low importance to Google
• Confirm that all pages you want indexed have a self-referencing canonical tag pointing to the correct URL
• Use the URL Inspection tool in Search Console to check the indexing status of specific pages

Every URL on your site returns an HTTP status code — and incorrect or inefficient status codes directly affect crawl efficiency, link equity distribution, and user experience. A site with numerous 404 errors, long redirect chains, or redirect loops is wasting crawl budget and diluting its own authority.

• In your Screaming Frog crawl, filter by response code to identify all 3xx, 4xx, and 5xx pages
• Fix all 404 errors on important pages — either restore the content or implement a 301 redirect to the most relevant existing page
• Eliminate redirect chains (A redirects to B which redirects to C) — point all redirects directly to the final destination
• Remove redirect loops — two pages that redirect to each other — these create infinite loops for crawlers
• Ensure all HTTP pages redirect to HTTPS — check for mixed redirect paths
• Verify that www and non-www versions of your domain redirect consistently to one canonical version
• Check that your homepage URL is consistent — trailing slash vs no trailing slash should be standardised
• Review internal links — update any internal links that point to redirected URLs to point directly to the final destination

HTTPS is a confirmed Google ranking signal and a fundamental trust signal for users. An insecure website — or one with HTTPS implementation errors — can suppress rankings and trigger browser security warnings that devastate click-through rates.

• Confirm all pages are served over HTTPS — check for any HTTP pages remaining after migration
• Check for mixed content warnings: pages served over HTTPS that load resources (images, scripts, CSS) over HTTP
• Use Chrome DevTools (F12 > Console) to identify mixed content errors on specific pages
• Verify your SSL certificate is valid, not expired, and covers all subdomain variations you use
• Check that your SSL certificate covers both www and non-www versions of your domain
• Ensure all internal links use HTTPS URLs — not HTTP
• Test your security headers at securityheaders.com — look for HSTS, CSP, and X-Frame-Options

Page speed and Core Web Vitals are direct ranking signals and among the most impactful technical SEO factors for user experience. Google’s Core Web Vitals report in Search Console gives you site-wide performance data; PageSpeed Insights gives you page-level recommendations.

• Open Search Console > Experience > Core Web Vitals — review the proportion of URLs rated Good, Needs Improvement, and Poor
• Identify the specific pages driving Poor CWV scores — these are your highest-priority speed fixes
• Run your most important pages through PageSpeed Insights — review both mobile and desktop scores
• Largest Contentful Paint (LCP) under 2.5 seconds: optimise images, enable lazy loading, improve server response time, use a CDN
• Interaction to Next Paint (INP) under 200ms: reduce JavaScript execution time, remove render-blocking scripts, defer non-critical JS
• Cumulative Layout Shift (CLS) under 0.1: set explicit width and height attributes on images and video embeds, avoid inserting content above existing elements
• Compress and convert images to next-generation formats (WebP, AVIF) — image size is the most common LCP bottleneck
• Enable browser caching and GZIP compression at the server level
• Review Time to First Byte (TTFB) — a TTFB above 800ms indicates server or hosting issues that need addressing

Google uses mobile-first indexing — it primarily uses the mobile version of your site for crawling, indexing, and ranking. A site that performs well on desktop but poorly on mobile will see suppressed rankings across all devices. The Mobile Usability report in Search Console identifies the most common mobile issues.

• Open Search Console > Experience > Mobile Usability — review all flagged issues
• Common issues to check: text too small to read, clickable elements too close together, content wider than screen
• Test your most important pages using Google’s Mobile-Friendly Test tool
• Verify your site uses responsive design — a single design that adapts to all screen sizes
• Check that your mobile viewport meta tag is correctly configured: content=‘width=device-width, initial-scale=1’
• Ensure tap targets (buttons, links) are at least 48x48 pixels and have sufficient spacing between them
• Verify that no content is hidden behind interstitials or pop-ups that trigger immediately on mobile — Google penalises intrusive interstitials
• Test form usability on mobile — are form fields properly sized and do they trigger the correct keyboard type?

Duplicate content — multiple URLs serving identical or near-identical content — is one of the most common and impactful technical SEO issues. It confuses Google about which version of a page to index and rank, dilutes link authority across multiple versions, and wastes crawl budget on pages that should not exist.

• In Screaming Frog, use the Duplicate Content report to identify pages with identical or near-identical content
• Check for common duplicate URL patterns: trailing slashes (/page vs /page/), parameter URLs (?sort=price), session IDs, www vs non-www
• Verify canonical tags are present on all pages and point to the correct preferred URL
• Check that canonical tags are self-referencing on unique pages — not pointing to unrelated pages
• Identify pagination issues — paginated series should use rel=‘next’ and rel=‘prev’ or canonical to the first page
• Check for duplicate or near-duplicate title tags and meta descriptions across the site
• Review category and tag pages on blogs and e-commerce sites — these are frequent sources of thin duplicate content
• If you have print versions, mobile versions, or translated pages, ensure proper hreflang and canonical implementations

Beyond crawlability and indexing, the technical implementation of on-page elements directly affects how well Google understands your content and how competitive your pages are in search results. This step audits the technical quality of the page-level signals across your site.

• Check for missing, duplicate, or over-length title tags: Screaming Frog > Page Titles report — flag any missing, duplicate, or over 60 characters
• Check for missing, duplicate, or over-length meta descriptions: flag any missing, duplicate, or over 155 characters
• Verify every page has exactly one H1 tag — no pages with missing H1s or multiple H1s
• Check that heading structure is logical — H2 follows H1, H3 follows H2 — no skipped heading levels
• Review image alt text: Screaming Frog > Images > filter for missing alt text — add descriptive alt text to all important images
• Check internal link anchor text — ensure descriptive, keyword-rich anchor text rather than generic ‘click here’ or ‘read more’
• Identify broken internal links (pointing to 404 pages) and update them to the correct destination
• Review structured data implementation using Google’s Rich Results Test tool — fix any schema markup errors
• Verify Open Graph and Twitter Card tags on key pages for accurate social sharing previews

Site architecture — the way your pages are organised and connected — has a direct impact on how effectively Google discovers and evaluates your content, and how authority flows through your site. Poor architecture can leave valuable pages buried deep in the site structure and undermine the topical signals you are trying to build.

• Check crawl depth: in Screaming Frog, filter by Level to identify pages more than three clicks from the homepage
• Identify orphaned pages — pages with no internal links pointing to them — and add relevant internal links
• Review the distribution of internal links across pages — high-priority pages should receive more internal links from other pages
• Check that your most important pages (key service pages, pillar content) are linked from the homepage and top navigation
• Identify internal link opportunities: for each cluster of related content, ensure cross-linking between pages
• Review navigation structure — can users and crawlers reach every important page within three clicks?
• Check for pages with excessive outbound links (over 100 links per page) which dilute link equity
• Verify breadcrumb navigation is implemented on category and product pages — improves crawl path clarity and user experience

Technical SEO Issues — Impact, Detection & Resolution Reference

Use this reference table to quickly identify the severity of common technical SEO issues, understand how to detect them, and know how to resolve them efficiently.

Issue	Impact	How To Detect	How To Fix
Pages blocked by robots.txt	Critical	robots.txt review + GSC URL Inspection	Update robots.txt Disallow rules — remove blocks on important pages
Accidental noindex tags	Critical	Screaming Frog > Directives > Noindex	Remove noindex meta tags from pages that should be indexed
Pages not in sitemap	Critical	Compare sitemap URLs to crawl — identify gaps	Add all indexable pages to XML sitemap; regenerate and resubmit
404 errors on key pages	High	Screaming Frog > Response Codes > 4xx	Restore page or implement 301 redirect to most relevant live page
Redirect chains (3+ hops)	High	Screaming Frog > Redirects	Update redirects to point directly to the final destination URL
Duplicate title tags	High	Screaming Frog > Page Titles > Duplicate	Write unique, descriptive title tags for every page
Missing H1 tags	High	Screaming Frog > H1 > Missing	Add a unique, keyword-rich H1 heading to every page
Slow LCP (over 2.5s)	High	Search Console > Core Web Vitals	Optimise images, improve server response, use CDN, enable lazy loading
Missing canonical tags	High	Screaming Frog > Canonicals > Missing	Add self-referencing canonical tags to all unique pages
Mixed content (HTTP on HTTPS)	High	Chrome DevTools > Console tab	Update all resource URLs to HTTPS; check CDN and plugin settings
Mobile usability errors	High	Search Console > Mobile Usability	Fix text size, tap targets, and viewport configuration issues
Broken internal links	Medium	Screaming Frog > Response Codes > internal 4xx	Update broken internal links to point to correct live URLs
Missing image alt text	Medium	Screaming Frog > Images > Missing Alt Text	Add descriptive, keyword-relevant alt text to all significant images
Orphaned pages	Medium	Crawl pages with no internal links pointing to them	Add contextual internal links from relevant pages to orphaned content
High CLS (over 0.1)	Medium	Search Console > Core Web Vitals / PageSpeed	Set explicit dimensions on images and embeds; avoid dynamic content injection
Schema markup errors	Medium	Google Rich Results Test tool	Fix schema syntax errors; validate with structured data testing tool

How to Prioritise Your Audit Findings

A thorough technical SEO audit will almost always surface more issues than you can fix at once. Prioritisation is essential — working on the wrong issues first delays the results that matter most. Use this framework to sequence your fixes effectively.

• P1Immediate action — crawlability & indexability blockersAny issue preventing Google from crawling or indexing important pages. These are emergencies. A site that cannot be crawled generates no organic traffic regardless of other SEO work. Fix within 48 hours.
• P2High impact — critical technical errors on important pages404 errors on key pages, redirect chains, duplicate content issues, missing canonicals, HTTPS errors, and failing Core Web Vitals on your most important pages. Fix within 1–2 weeks.
• P3Medium impact — page-level optimisation issuesDuplicate title tags, missing meta descriptions, missing H1s, broken internal links, missing alt text, and orphaned pages. Fix progressively over 2–4 weeks.
• P4Lower impact — enhancements and improvementsSchema markup implementation, structured data enhancements, security headers, and non-critical page speed improvements. Address as ongoing maintenance.

How Often Should You Run a Technical SEO Audit?

Technical SEO is not a one-time event — it is an ongoing maintenance discipline. Websites change constantly: new pages are added, plugins are updated, redirects multiply, and content management errors introduce new issues regularly. A site that was technically clean six months ago may have accumulated dozens of new issues since then.

Frequency	What To Audit
Weekly	Monitor Google Search Console for new crawl errors, manual actions, and Core Web Vitals changes. Review any new pages added to the site.
Monthly	Run a targeted crawl of new or recently changed pages. Review index coverage for any newly excluded pages. Check for new broken links.
Quarterly	Full site crawl and comprehensive review of all audit areas. Update the audit findings document. Re-prioritise any outstanding issues.
After major changes	After any significant website change — platform migration, redesign, URL restructure, new plugin installation — run an immediate full audit to catch any issues introduced by the change.

Technical SEO Audit Master Checklist

Work through this checklist systematically during your audit. Each section corresponds to one of the ten audit steps above.

This article was written by the Innovsystems team. Innovsystems is a results-driven digital marketing agency specialising in SEO, PPC, social media, content, AI automation, and influencer marketing.