Short answer: A technical SEO audit is a systematic review of your website to find issues that prevent search engines from crawling, indexing, and ranking your pages. It covers crawl errors, index coverage, site speed, mobile usability, site structure, security, and structured data.
Key takeaways
- Use Google Search Console to find crawl and index errors.
- Check site speed with PageSpeed Insights and fix slow resources.
- Ensure your site is mobile-friendly and passes Google’s test.
- Review site structure for clean URLs and proper internal linking.
- Confirm HTTPS is active and all pages redirect to the secure version.
- Validate structured data with Google’s Rich Results Test.
What you will find here
If your site isn’t ranking, the problem is often technical. A technical SEO audit uncovers hidden issues that block search engines from finding and indexing your pages. You don’t need to be a developer to run one. Follow these 7 steps to conduct a thorough technical SEO audit yourself.
1. Check Crawl and Index Coverage
Start with Google Search Console. Open the Indexing section and look at the Pages report. It shows how many pages Google has indexed and flags errors like “Crawled – currently not indexed” or “Discovered – currently not indexed”.
Export the list of unindexed pages and investigate why. Common causes are thin content, canonical issues, or missing internal links. If Google found a page but didn’t index it, improve the page’s quality and add more internal links pointing to it.
Next, check your sitemap. In Search Console, submit your XML sitemap and ensure it’s valid with no errors. The sitemap should list only canonical pages, not paginated or filtered URLs.
Also look at your robots.txt file. Make sure it doesn’t block important resources like CSS or JavaScript. Go to yourdomain.com/robots.txt and review the rules. Blocking essential files can prevent Google from rendering your pages correctly.
2. Evaluate Site Speed
Page speed is a direct ranking factor. Use Google’s PageSpeed Insights to test both mobile and desktop versions. The tool gives you a score (out of 100) and a list of specific recommendations.
Common fixes to prioritize
Image optimization: Compress images using tools like TinyPNG. Use WebP format for faster loading. Server response time: If your server takes longer than 200ms, consider upgrading hosting or using a CDN. Render-blocking resources: Defer non-critical CSS and JavaScript so the main content loads first.
Run the test again after each change to measure impact. Aim for a score of 90+ on both mobile and desktop.
3. Verify Mobile Usability
More than half of all web traffic comes from mobile devices. Google uses mobile-first indexing, meaning it primarily evaluates your mobile page. Use the Mobile-Friendly Test tool. Enter your URL and see if it passes. Common failures include text too small to read, clickable elements too close together, and viewport not set.
Also check your site on a real phone. Navigate a few key pages and look for layout issues. If you have pop-ups that cover the screen, remove them for mobile visitors. Ensure the menu is easy to tap with a thumb.
4. Review Site Structure and URLs
A clean site structure helps search engines understand your content hierarchy. Pages should be 3 or fewer clicks from the homepage. Use descriptive, short URLs that include your target keyword. For example, /guides/technical-seo-audit is good; /p=123 is not.
Check for duplicate content issues. Use canonical tags to tell Google which URL is the primary version. If you have multiple URLs serving the same content (e.g., HTTP vs HTTPS, www vs non-www), set a preferred domain in Search Console and implement 301 redirects.
Internal linking matters for crawling. Every important page should have at least a few internal links pointing to it. Use descriptive anchor text. Avoid links in navigation that are blocked by nofollow or JavaScript events.
5. Ensure HTTPS and Security
HTTPS is a ranking signal and essential for user trust. Confirm your site loads over HTTPS with a valid SSL certificate. Go to your site in a browser and click the padlock icon to check. If the certificate is expired or invalid, renew it immediately. Make sure all versions of your site (http, https, www, non-www) redirect to a single preferred version. Use 301 redirects.
Also scan for mixed content. Mixed content happens when a secure page loads insecure resources (e.g., images from http://). Use a free tool like Why No Padlock? to scan and fix those URLs.
6. Validate Structured Data
Structured data helps search engines understand your content and can trigger rich results. Use Google’s Rich Results Test. Enter a URL and see if structured data is detected. Schema types like Article, Product, FAQ, and HowTo are common.
If you have existing markup, check for errors and warnings. A single error can prevent all rich results from showing. If you don’t have structured data yet, add it to key pages. For blog posts, use Article schema with properties like headline, image, datePublished, and author.
7. Audit for Soft 404s and Broken Links
Soft 404s are pages that return a 200 status but show an error or empty content. They confuse search engines. Use a crawler like Screaming Frog to find URLs that return 200 but have thin content. Set those pages to 404 or improve the content.
Broken links hurt user experience and waste crawl budget. Use Screaming Frog to find all 404 errors on your site. Redirect each broken internal link to a relevant working page. For external broken links, remove them or update the URL. Also check your sitemap for 404s and remove those entries.
8. Monitor Crawl Budget Allocation
Crawl budget is the number of URLs Googlebot will crawl on your site within a given timeframe. For large sites (over 10,000 pages), managing crawl budget becomes critical. In Search Console, check the Crawl Stats report to see how many requests Google makes per day and the average response time. If Google is spending budget on low-value pages like filtered product pages or session IDs, block them in robots.txt or use noindex tags.
Prioritize crawl budget on pages that drive traffic and conversions. Use internal linking and sitemaps to signal importance. Avoid crawling parameters by setting up proper URL parameters handling in Search Console. If you notice a sudden drop in crawl rate, it could indicate server issues or a penalty.
9. Check for JavaScript Rendering Issues
Many modern websites rely on JavaScript to load content. If Google can’t render your JavaScript properly, it may miss important content. Use the URL Inspection Tool in Search Console. Enter a URL and click “View Crawled Page”. Compare what Google sees with what a user sees. If there’s a mismatch, you have a rendering problem.
Common fixes include using server-side rendering (SSR) or pre-rendering for dynamic content. Ensure your JavaScript framework outputs content in HTML that Google can parse. Avoid lazy-loading critical content with JavaScript—use HTML alternatives when possible. Test pages with JavaScript disabled to see what Googlebot encounters.
After you finish these 7 steps, run a second audit a month later to see if your fixes improved indexation and traffic. Technical SEO is ongoing. Regularly schedule audits every quarter to catch new issues early.
Frequently asked questions
What is a technical SEO audit?
A technical SEO audit is a systematic review of your website to identify issues that prevent search engines from crawling, indexing, and ranking your pages. It covers areas like site speed, mobile usability, site structure, security, and structured data.
How often should I run a technical SEO audit?
Run a full technical SEO audit at least once every quarter. If you make major changes to your site (like a redesign or new platform), audit immediately after launch. Smaller checks like crawl errors in Search Console can be done weekly.
What tools do I need for a technical SEO audit?
The essential free tools are Google Search Console, Google PageSpeed Insights, and the Mobile-Friendly Test. For deeper analysis, use Screaming Frog SEO Spider (free up to 500 URLs) or Sitebulb. Ahrefs and Semrush also offer site audit features.
How long does a technical SEO audit take?
For a small site (under 100 pages), an audit can take 2–4 hours. For larger sites (10,000+ pages), expect 8–20 hours depending on crawl depth and number of issues. Automated tools speed up the process significantly.
Can I fix technical SEO issues without a developer?
Many issues are fixable without coding. You can compress images, update alt text, fix redirects, and add structured data using plugins or content management systems. For server-side fixes like caching or HTTPS, you may need a developer’s help.