Complete Guide to Technical Website Audit for SEO

These terms are related but aren’t exactly the same.

A broader SEO audit may evaluate:

• Technical SEO
• Content
• Keywords
• Backlinks
• On-page optimization
• Local SEO
• Competitors

A technical SEO audit focuses primarily on the website’s technical foundation.

For example:

A complete SEO strategy may require both.

1. Check Website Crawlability

Search engines need to crawl your website before they can understand its pages.

Crawlability problems can occur because of:

• Incorrect robots.txt rules
• Broken links
• Poor website architecture
• Server errors
• Excessive redirects
• Orphan pages
• Incorrect canonicalization

During an audit, check whether important pages can be discovered and crawled.

Google provides guidance about how search engines crawl and access websites through Google Search Central.

2. Review Indexability

Crawling and indexing are different.

A search engine can crawl a page but still decide not to index it.

Check for:

• noindex directives
• Incorrect canonical tags
• Duplicate pages
• Soft 404s
• Low-value pages
• Server errors
• Incorrect robots directives

Important commercial and informational pages should be technically eligible for indexing when appropriate.

Google Search Console can help website owners inspect indexing information and search performance.

3. Check Robots.txt

The robots.txt file provides instructions to crawlers about which areas of a website they should or shouldn’t access.

An incorrectly configured robots.txt file can accidentally restrict important pages or resources.

During a technical SEO audit, check:

• Whether the file exists
• Whether important sections are blocked
• Whether unnecessary areas are restricted
• Whether the configuration matches your SEO strategy

Don’t use robots.txt as a substitute for controlling indexing when another method is more appropriate.

4. Review XML Sitemap

An XML sitemap helps search engines discover important URLs on your website.

Check whether your sitemap:

• Exists
• Is accessible
• Contains important URLs
• Avoids unnecessary URLs
• Uses correct canonical URLs
• Is updated appropriately
• Is submitted through relevant search engine tools

For larger websites, maintaining a clean sitemap is particularly important.

5. Check HTTPS and Website Security

HTTPS protects data exchanged between users and websites.

A technical audit should verify:

• HTTPS is active
• HTTP redirects correctly to HTTPS
• SSL certificates are valid
• Mixed-content problems are resolved
• Internal links use the preferred HTTPS version

Website security also matters for user trust.

Businesses should maintain secure CMS software, plugins, themes, frameworks, and integrations.

6. Analyze Website Speed

Website performance is an important part of user experience.

A slow website can frustrate visitors and make it harder for them to:

• Read content
• Navigate pages
• Submit forms
• Complete purchases
• Contact a business

During a technical SEO audit, check:

• Page loading time
• Server response
• Image sizes
• JavaScript
• CSS
• Caching
• Hosting performance
• Third-party scripts

Use Google PageSpeed Insights to analyze page performance and receive optimization suggestions.

7. Review Core Web Vitals

Core Web Vitals are metrics designed to evaluate important aspects of page experience.

The key metrics include:

• Largest Contentful Paint (LCP)
• Interaction to Next Paint (INP)
• Cumulative Layout Shift (CLS)

Google provides detailed documentation about these metrics through Web Vitals.

During an audit, review performance data and identify pages that require improvement.

8. Check Mobile Usability

Many users browse websites on smartphones.

A technical audit should confirm that your website works properly across:

• Smartphones
• Tablets
• Laptops
• Desktop computers

Check:

• Responsive layouts
• Font sizes
• Buttons
• Forms
• Navigation
• Images
• Videos
• Pop-ups

Google’s mobile-first indexing means businesses should ensure their mobile experience contains the important content and functionality available to users.

9. Review URL Structure

A clear URL structure helps users and search engines understand website organization.

Good URLs are generally:

• Descriptive
• Simple
• Consistent
• Relevant
• Easy to read

For example:

Poor:

example.com/page?id=12345

Better:

example.com/technical-seo-audit/

Avoid unnecessarily complicated URL structures with excessive parameters or confusing folders.

10. Check Canonical Tags

Canonical tags help communicate the preferred version of similar or duplicate URLs.

They can be useful when websites have:

• Product variations
• Tracking parameters
• Multiple URL versions
• Duplicate pages
• Filtered content

During an audit, check whether canonical tags:

• Exist where appropriate
• Point to the correct URL
• Use the preferred protocol
• Avoid unnecessary conflicts

Incorrect canonical tags can cause important pages to be overlooked.

11. Find Broken Links

Broken links can negatively affect user experience.

Look for:

• Broken internal links
• Broken external links
• Deleted pages
• Incorrect URLs
• 404 responses

Fix them by:

• Updating the link
• Removing unnecessary links
• Redirecting relevant permanently moved pages

A clean linking structure makes navigation easier.

12. Review Redirects

Redirects are useful when URLs change.

However, poorly implemented redirects can create problems.

During a technical SEO audit, look for:

• Redirect chains
• Redirect loops
• Incorrect destination URLs
• Temporary redirects used unnecessarily
• Large numbers of redirects

Where appropriate, permanently moved pages should use suitable permanent redirects.

13. Analyze Internal Linking

Internal links connect pages on your website.

They help users discover related information and can help search engines understand the relationships between pages.

Review:

• Important pages with few internal links
• Orphan pages
• Navigation links
• Contextual links
• Anchor text
• Links to deleted pages

For example, a blog about technical SEO can naturally link to your technical SEO services page.

14. Check Duplicate Content

Duplicate content can make website management and search engine understanding more difficult.

Common causes include:

• Multiple URL versions
• Similar product pages
• Duplicate category pages
• HTTP and HTTPS versions
• www and non-www versions
• URL parameters

A technical audit should identify duplicate URLs and determine whether they should be:

• Consolidated
• Canonicalized
• Redirected
• Improved with unique content

15. Review Structured Data

Structured data provides search engines with additional context about webpage content.

Depending on your website, you may use structured data for:

• Articles
• Products
• Organizations
• Local businesses
• Events
• Breadcrumbs
• FAQs where eligible

Structured data must accurately represent the content on the page.

Avoid adding markup simply to manipulate search appearance.

16. Check 404 Errors

404 errors indicate that a requested page cannot be found.

Some 404 errors are normal, especially when old URLs are intentionally removed.

However, important pages returning 404 errors can cause problems.

During an audit:

1. Identify 404 URLs.
2. Determine why they are being requested.
3. Restore important pages if appropriate.
4. Redirect relevant permanently moved pages.
5. Remove broken internal links.

17. Review Website Architecture

Website architecture determines how pages are organized and connected.

A logical structure makes it easier for users and search engines to navigate the site.

For example:

Home → Services → SEO Services → Technical SEO

This creates a logical relationship between pages.

Avoid creating unnecessarily deep page structures where important pages are difficult to reach.

18. Check Image Optimization

Images can improve content but may also affect performance.

Check:

• File size
• File format
• Dimensions
• ALT text
• Responsive images
• Lazy loading where appropriate
• Image filenames

Use modern formats such as WebP or AVIF when appropriate.

Don’t add keywords to ALT text when they don’t accurately describe the image.

19. Review JavaScript and CSS

Modern websites often depend heavily on JavaScript and CSS.

Technical audits should check whether important content and functionality remain accessible when scripts fail or are delayed.

Review:

• Render-blocking resources
• Unused CSS
• Excessive JavaScript
• Third-party scripts
• Client-side rendering
• Interactive elements

Performance optimization should focus on both speed and functionality.

20. Analyze International SEO

Businesses serving multiple countries or languages may need additional technical SEO considerations.

Check:

• Language versions
• Country versions
• Hreflang implementation
• Canonical URLs
• Duplicate translated pages
• International URL structure

Incorrect international targeting can cause search engines to show the wrong language or regional version to users.