SEO Audits
A technical SEO audit is a structured review of a site’s infrastructure to make sure search engines can crawl, render, index, and trust its pages.
Key takeaways
- A technical SEO audit checks crawlability, indexability, performance, mobile usability, and markup.
- Use Google Search Console and a site crawler to identify issues.
- Prioritize fixes that block crawling or indexing first.
- Audits should be repeated regularly, especially after site changes.
- Common mistakes include one-time thinking and ignoring mobile or structured data.
Technical issues can prevent otherwise strong content from appearing in search results, so audits help protect visibility and organic traffic.
Example: Fixing a crawl block that hid 500 pages
A mid-size e-commerce site had 500 product pages that never appeared in Google. A technical audit revealed:
- robots.txt blocked the entire
/products/directory. - Google Search Console showed 0 indexed URLs from that section.
- The XML sitemap included those URLs, but Google couldn't crawl them.
Fix: Removed the disallow rule in robots.txt, resubmitted the sitemap, and monitored Coverage reports. Within 2 weeks, 450+ pages were indexed, and organic traffic to product pages increased by 30%.
Quick-start: Run a basic technical SEO audit in 5 steps
- Set up Google Search Console – Verify your site and check the Coverage report for errors, warnings, and valid pages.
- Crawl your site – Use Screaming Frog SEO Spider or Semrush Site Audit to find broken links, redirect chains, duplicate content, and missing meta tags.
- Check indexability – Review robots.txt, XML sitemaps, and canonical tags. Ensure no important pages are blocked from indexing.
- Test performance – Run Google PageSpeed Insights on key pages. Focus on LCP, INP/FID, and CLS.
- Review mobile usability – Use Google Search Console’s Mobile Usability report. Fix tap targets, viewport issues, and content wider than screen.
How to judge audit results: Practical criteria
- Crawlability: Can Googlebot access all important pages? Check robots.txt, sitemap coverage, and crawl errors.
- Indexability: Are pages in the index? Use the URL Inspection tool in Search Console.
- Performance: Are Core Web Vitals passing? LCP < 2.5s, INP/FID < 200ms, CLS < 0.1.
- Mobile: Is the site usable on mobile? No horizontal scroll, readable text, adequate tap targets.
- Content quality: Is there duplicate content? Are canonical tags correct?
- Security: Is HTTPS enforced? Are there mixed content warnings?
- Structured data: Is schema markup valid? Use the Rich Results Test.
Common mistakes in SEO audits
- Treating the audit as a one-time checklist – Technical SEO needs ongoing monitoring; issues reappear after site updates.
- Focusing only on crawler warnings – Validate findings against Search Console data and real user behavior.
- Fixing low-impact issues first – Prioritize crawl, indexation, and performance blockers over minor errors.
- Ignoring mobile, structured data, or internal linking – These areas often hold significant potential opportunities.
Next step
Related topics
Sources
- Google Search Central — Primary source for crawl, indexation, sitemaps, robots.txt, structured data, and Search Console guidance.
- Google Search Console Help — Best source for interpreting Coverage, crawling, and index-related reports.
- Google PageSpeed Insights — Useful for Core Web Vitals and performance-related audit checks.
- Semrush Academy / Blog — Widely used practitioner reference with practical audit workflows and tool usage.
- Screaming Frog SEO Spider — Industry-standard crawler for technical audits and URL-level issue discovery.
Reviewed by Lucía Marín, Founding editor.