SEO Audit Checklist: 25 Steps to Diagnose and Fix Your Website

SEO auditing without using an SEO checklist is similar to conducting surgery without a strategy. While some improvements might be achieved, chances are that you will definitely overlook the problems which really need your attention.

This SEO auditing checklist includes all aspects of SEO from technical SEO to off-page SEO, and hence, it is going to help you identify what needs to be done.

Table of Contents

What Is an SEO Audit?

An SEO audit consists of a thorough review of your website to discover elements that hinder its ability to achieve a better ranking position. You can imagine an SEO audit as your site’s doctor visit, during which technical issues, content deficiencies, and missed opportunities come to light.

A Thorough SEO Audit Covers:

Technical SEO (crawling, indexing, performance)
On-page SEO (content, keywords)
Off-page SEO (backlinks)
User experience indicators

Why Run an SEO Audit?

Without frequent auditing, minor issues will turn into major ones. Even one noindex page may cause losses for many months. Usually, it is advised by SEO specialists to perform site audits each 3 to 6 months, especially after any major changes.

Technical SEO Audit Checklist

1. Check Your Robots.txt File

Your robots.txt is where you specify which URLs should be crawled by the search engines. Go to yourdomain.com/robots.txt and check the “Disallow” statements. Check whether Googlebot has access to your critical pages using the Robots Tester of Google Search Console.

Common issue: Inadvertently disallowing access to necessary CSS/JS files by Googlebot.

2. Verify Your XML Sitemap

Visit Search Console -> Sitemaps and ensure that your site map is registered, there are no errors with your sitemap, and the number of URLs on it is approximately equal to the number of your indexed pages.

Common issue:Sitemaps with no indexed pages or redirects.

3. Fix Crawl Errors

In Ahrefs Site Audit, analyze all 4xx and 5xx codes. In Google Search Console, go to Coverage > Error.

Common issue:404s and soft 404s for deleted pages.

4. Audit Redirect Chains

Check the reports on redirect chains in Ahrefs Site Audit (A→B→C). All internal links should lead straight to the destination URL.

5. Confirm HTTPS Implementation

Check to see that the padlock icon is present when you visit your website.

Check for mixed content errors using Chrome DevTools.

Common issue:Images or scripts delivered via HTTP on HTTPS sites

6. Test Core Web Vitals

Use Google PageSpeed Insights or the Core Web Vitals report on Search Console.

Targets:

Largest Contentful Paint <2.5 seconds
Input Delay <200ms
Cumulative Layout Shift <0.1

7. Review Canonicalization

Look at Ahrefs Site Audit to identify pages having duplicate and canonical tags.

Common issue:HTTP and HTTPS are indexable; www and non-www are indexable.

8. Check Mobile-Friendliness

Use the Google Mobile Friendly Test. Look at the Mobile Usability report in Search Console.

Common issue: Font too small, clickable items too close.

On-Page SEO Audit Checklist

9. Audit Title Tags

Use Ahrefs Site Audit or Screaming Frog to get all the title tags.

Look for:

Missing titles
Duplicates
Titles exceeding 60 characters
Keywords not in titles

10. Review Meta Descriptions

Flag:

Missing
Duplicate
Exceeding 155 characters

Meta descriptions may be well-written to increase click-through rates despite not being a ranking factor.

11. Analyze Header Structure

H1s are used on each page only once, containing the keyphrase. H2s serve for the structure of the content. Missing and redundant H1s can be found with the help of Ahrefs.

12. Check Keyword Optimization

Get the organic keyword report for your key pages using Ahrefs Site Explorer. Check how the ranking keyphrase matches with the targeted one.

13. Assess Content Quality

Go through your top 20 pages manually.

Ask:

Does this cover the query sufficiently?
Does this provide more value than the number-one result now?
Is the information up-to-date?

14. Fix Keyword Cannibalization

In Site Explorer of Ahrefs, search for the targeted keyword. If there is more than one page ranked for that keyword, it means cannibalization exists. Resolve the issue by either merging or splitting the pages.

15. Review Internal Linking

Important pages must be linked internally from multiple pages. Orphan pages should be linked from related pages.

16. Check Image Optimization

Check for:

Images without alternative texts
Large-sized files (convert to WebP format)
Non-descriptive filenames

Off-Page SEO Audit Checklist

17. Audit Your Backlink Profile

In Ahrefs Site Explorer, examine your backlinks report. Filter by DR and identify spammy links originating from bad-quality or spammy websites.

18. Disavow Harmful Links

If there are manipulative links identified, make use of the disavow tool on Google Search Console. Be cautious and conservative when using the disavow tool; most websites will not require its usage.

19. Analyze Referring Domain Diversity

Backlinks from 100 sites are better for SEO than backlinks from 100 webpages on one site. Check the DR spread and relevance of your referring sites.

20. Review Anchor Text Distribution

Your backlink profile should consist mainly of branded, naked URLs, and generic anchors. Over-optimization of keyword anchors is an obvious sign of blackhat techniques.

Content Audit Checklist

21. Identify Thin Content

Export all pages containing less than 300 words and less than 10 organic visits/month.

Choose:

Update
Consolidate
Delete

22. Find Outdated Content

Filter the content according to publication dates older than 18 months.

Update:

Statistics
Create new sections
Update examples
Publication dates

23. Close Content Gaps

Ahrefs Content Gap tool (Site Explorer > Content Gap)Enter up to three of your main competitors to see what they are ranking for and you aren’t.

24. Review Click Depth

All the relevant pages must be accessible within 3 mouse-clicks from the homepage. Use internal links from high authority pages to deep content.

25. Check Schema Markup

Run Google’s Rich Results Test on your key pages.

Think about:

Crawl errors
Manual actions
Index problems
HTTPS errors

How to Prioritize Your SEO Audit Findings

Critical (Fix Immediately)

Crawl blocks
Manual actions
Indexing problems
HTTPS implementation problems site-wide

High (Fix Within 1 Week)

Core Web Vitals problems
Title tag issues on key pages
404s on linked pages

Medium (Fix Within 1 Month)

Thin pages
Schema missing
Slow secondary pages

Low (Fix When Possible)

Tiny copy tweaks
Minor image optimization changes

How Often to Run an SEO Audit

Full Technical Audit

Every 3–6 months

Content Audit

Every 6–12 months

Backlink Audit

Monthly (Ahrefs Alerts will tell you when there are new links)

Core Web Vitals

Monthly search console review

Tools You Need

Ahrefs Site Audit: Automatic crawl with more than 100 SEO problems detected
Google Search Console: Index coverage, Core Web Vitals, manual actions taken
Google PageSpeed Insights: Page speed & CWVs
Screaming Frog: Deep technical crawl for bigger websites

Conclusion

An effective SEO audit checklist ensures that you have a structured approach to determine the precise reason for underperformance of your website. By addressing all parts of the checklist and working on the critical problems first, you can resolve issues systematically. An SEO audit should be conducted every three to six months.

Many successful websites differ from unsuccessful ones not in terms of budget or skills but in their discipline of conducting audits and resolving problems identified.