A website may have useful content and a good design, but technical problems can still make it difficult for search engines to access and understand its pages.
This is where a technical SEO audit becomes useful.
A technical SEO audit assesses a website’s technical health and identifies issues that may affect crawling, indexing, performance, and search visibility. It can also uncover problems that aren’t immediately visible when browsing the website normally.
You don’t need to be a developer to understand the basics. With tools like Google Search Console, Screaming Frog, and Google PageSpeed Insights, you can identify and review many common technical SEO issues.
This guide covers the main areas you should check during a technical SEO audit and explains why each one matters.
What Is a Technical SEO Audit?
A technical SEO audit is a review of the technical elements that affect how search engines access, crawl, understand, and index a website.
The purpose is not simply to collect warnings from SEO tools. It is to identify problems that could prevent important pages from performing properly in search.
A good audit helps you understand whether search engines can reach your pages, whether the correct URLs are indexable, whether the site structure is clear, and whether technical problems are affecting the user experience.
Technical SEO Audit Checklist
1. Check Whether Search Engines Can Crawl the Website
Crawling is how search engines discover pages and follow links across a website.
Start by checking whether important sections of the website are accessible to search engine crawlers.
Review your internal linking structure, crawl depth, server responses, and any restrictions that could prevent crawlers from reaching important pages.
A crawler such as Screaming Frog SEO Spider can help you see the website in a similar way to a search engine crawler and identify pages that are difficult or impossible to reach.
2. Check Which Pages Can Be Indexed
A page being crawlable doesn’t automatically mean it can be indexed.
Review your important pages to make sure they aren’t accidentally excluded from search results.
Pay attention to noindex directives, canonical URLs, HTTP status codes, and other signals that may affect indexability.
Google Search Console’s URL Inspection tool is useful when you want to investigate the indexing status of a particular page.
The goal is simple: pages that should appear in search should be technically eligible for indexing, while pages that shouldn’t appear should be handled intentionally.
3. Review Robots.txt
The robots.txt file tells search engine crawlers which areas of a website they are allowed or not allowed to crawl.
Check the file for rules that could unintentionally block important pages or resources.
Be careful when editing robots.txt. Blocking crawling and preventing indexing are different things, so robots.txt should not automatically be used when your actual goal is to keep a page out of search results.
4. Review the XML Sitemap
An XML sitemap provides search engines with a list of URLs you want them to know about.
Check that your sitemap is accessible and contains the correct URLs.
Ideally, it should include important indexable pages and avoid URLs that are broken, redirected, duplicated, or intentionally excluded from search.
You should also make sure the correct sitemap is submitted in Google Search Console.
A clean sitemap makes it easier to communicate which URLs are important on your website.
5. Make Sure the Website Uses HTTPS Correctly
HTTPS protects information transferred between the website and its visitors.
Check that the main version of your website uses HTTPS and that HTTP URLs redirect correctly to their HTTPS versions.
Internal links, images, scripts, and other important resources should also use secure URLs where appropriate.
You should avoid having different HTTP and HTTPS versions of the same content accessible unnecessarily.
6. Check HTTP Status Codes
HTTP status codes tell browsers and search engines what happened when they requested a URL.
During an audit, pay attention to unexpected responses on important pages.
Common status codes include:
- 200 for a successful request
- 301 for a permanent redirect
- 302 for a temporary redirect
- 404 when a page cannot be found
- 410 when content has been intentionally removed
- 5xx codes for server-side problems
The important part isn’t simply finding these codes. You need to determine whether each response makes sense for that particular URL.
7. Review Redirects
Redirects are normal when URLs change, but poor redirect setups can create unnecessary crawling and usability problems.
Check for redirect chains, loops, outdated redirects, and internal links that still point to redirected URLs.
Where practical, internal links should point directly to the final destination.
Pay particular attention to redirects after website migrations, URL changes, or major site restructuring.
8. Check Canonical Tags
Canonical tags help indicate the preferred URL when similar versions of a page exist.
Review the canonical configuration of important pages and check for URLs pointing to incorrect, redirected, broken, or unrelated pages.
Also look for conflicting signals between canonical tags, redirects, sitemaps, and indexability settings.
Canonical tags should reflect the actual structure and purpose of the website rather than being changed simply because an SEO tool reports a warning.
9. Review Internal Linking and Site Structure
Internal links connect related pages and help create a clear website structure.
During the audit, check whether important pages are easy to reach and logically connected to other relevant content.
Look for broken internal links, pages buried unnecessarily deep within the website, and important pages receiving very few internal links.
A clear site structure makes navigation easier for users and helps search engines understand how your content is connected.
10. Find Orphan Pages
Orphan pages are URLs that cannot be reached through the observed internal linking path of a normal website crawl.
Some may still appear in an XML sitemap, Google Search Console, or analytics data.
Finding these pages can help you identify valuable content that has become disconnected from the website.
However, don’t automatically add internal links to every orphan URL. First check whether the page is useful, current, indexable, and still relevant to the website.
11. Check Website Performance
Website performance affects how quickly and smoothly visitors can use a page.
Google PageSpeed Insights can help you identify performance problems and review Core Web Vitals.
The main Core Web Vitals are:
- LCP (Largest Contentful Paint) for loading performance
- INP (Interaction to Next Paint) for responsiveness
- CLS (Cumulative Layout Shift) for visual stability
Don’t focus only on achieving a perfect performance score. Look at the issues that are genuinely affecting users and prioritize meaningful improvements.
12. Review the Mobile Experience
Your website should work properly across different screen sizes.
Check important pages on mobile and make sure navigation, text, buttons, forms, images, and other elements are easy to use.
Also watch for layout problems, overlapping content, or elements that extend beyond the screen.
Mobile testing should focus on the experience of using the website rather than simply whether the layout technically fits on a smaller screen.
13. Check Structured Data
Structured data provides additional information that can help search engines understand certain types of content.
Depending on the website, you may have structured data for articles, products, organizations, breadcrumbs, events, or other supported content types.
Check that the markup is valid, relevant to the visible page content, and implemented on the correct URLs.
Google’s Rich Results Test can help you validate supported structured data.
Remember that valid structured data doesn’t guarantee that Google will display a rich result.
14. Look for Duplicate and Unnecessary URLs
Websites can sometimes create multiple URLs with identical or very similar content.
This can happen because of URL parameters, filters, CMS settings, duplicate pages, or different URL versions.
Review whether these URLs serve a genuine purpose.
Depending on the situation, duplicate URLs may need better canonicalization, redirects, internal-link changes, or other technical adjustments.
The goal isn’t to eliminate every similar page. It is to avoid unnecessary URL duplication that makes the website harder to manage and understand.
15. Check Important On-Page Elements
A technical crawl can also reveal problems with basic page elements.
Review important URLs for:
- Page titles
- Meta descriptions
- H1 headings
- Image alt attributes where appropriate
- Canonical URLs
- Indexability
Look for missing, duplicated, or incorrectly implemented elements.
These checks sit between technical and on-page SEO, but including them in an audit can help you catch problems efficiently.
16. Check JavaScript-Dependent Pages
Some websites depend heavily on JavaScript to display content, navigation, or links.
If your website uses JavaScript extensively, make sure important content is available when the page is rendered and that search engines can discover important links.
JavaScript itself is not automatically an SEO problem.
The concern is whether your implementation prevents search engines or users from accessing important content correctly.
Tools for a Technical SEO Audit
You don’t need a large collection of SEO tools to perform a useful audit.
Google Search Console can help with indexing, URL inspection, search performance, and sitemap monitoring.
Screaming Frog SEO Spider is useful for crawling the website and reviewing internal links, status codes, redirects, canonicals, indexability, headings, structured data, and other technical elements.
Google PageSpeed Insights can help you investigate performance and Core Web Vitals.
Platforms such as Semrush and Ahrefs can provide additional information when you need a broader site audit, organic search, or backlink data.
The right tool depends on what you’re investigating. More tools don’t automatically produce a better audit.
How Often Should You Perform a Technical SEO Audit?
There is no single schedule that works for every website.
A small website that changes occasionally may not require the same level of monitoring as a large e-commerce or publishing website.
However, a technical audit is particularly useful after:
- A website migration
- A redesign
- Major URL changes
- Significant CMS or development changes
- An unexpected drop in organic visibility
Periodic checks can also help identify problems before they become larger issues.
Common Technical SEO Audit Mistakes
One of the biggest mistakes is trying to fix every warning an SEO tool reports.
SEO tools provide information, but they don’t always understand the purpose of every page or technical decision.
Another mistake is changing important settings such as canonical tags, robots directives, or redirects without understanding why they were implemented.
Technical SEO changes can affect crawling and indexing, so they should be made carefully.
Finally, don’t assume that a technically perfect website will automatically rank well. Technical SEO creates a stronger foundation, but search performance also depends on content quality, relevance, competition, links, and other factors.
Final Thoughts
A technical SEO audit helps you understand whether anything on your website is making it unnecessarily difficult for search engines or users to access important content.
Start with the fundamentals: crawlability, indexability, robots.txt, XML sitemaps, HTTPS, status codes, redirects, internal links, performance, mobile usability, and structured data.
Then prioritize the problems that actually affect important pages instead of trying to achieve a perfect score in every SEO tool.
Technical SEO doesn’t need to be complicated. A good audit is simply a structured way to find technical problems, understand why they matter, and fix the ones that can make a meaningful difference to your website.
October 6, 2026
