Technical SEO Checklist: 20 Things to Audit Before Anything Else.

The most common SEO mistake many business owners make is hiring a non-rewarding SEO agency. Much more than the payment, they also lose time while their competitors gain ground. The interesting part is that the SEO agency might be doing all they are supposed to do but missing a golden gem. Hence, it’s always important to have a technical SEO checklist that audits any agency’s SEO approach. 

You can have the best content in your industry, the strongest backlinks, and the most thoroughly researched keyword strategy. However, none of it will matter if your website has technical problems preventing Google from finding, reading, and ranking your pages.

Hence, this article covers the 20 technical issues that most commonly hold businesses back. It’s a must-read for every business owner. 

What Is Technical SEO?

Technical SEO is the process of ensuring your website can be discovered, crawled, understood, and indexed by search engines — and increasingly, by AI platforms — without unnecessary friction.

It is the foundation on which everything else in your SEO strategy depends. Content strategy, keyword research, backlink building — all of these generate results only when the technical foundation is solid.

Think of it this way: technical SEO is not what attracts people to your website. It is what ensures Google can see your website clearly enough to recommend it in the first place.

20 Things For Your Technical SEO Checklist

1. Confirm Your Site Is Actually Indexed by Google

Indexing is the process by which Google saves a copy of your page in its database. If a page isn’t indexed, it cannot appear in search results. You cannot rank for what Google cannot see. This is the first thing to check because everything else is irrelevant if your pages aren’t indexed.

To check this, open Google Search Console and go to the Pages report. This shows you exactly which pages are indexed and which are excluded. However, you can also know the specific reason for each exclusion.

Common exclusion reasons:

• Crawled: Google visited but decided the content wasn’t valuable enough to save
• Blocked by robots.txt: Something is telling Google not to crawl these pages.
• Excluded by noindex tag: Someone added a tag explicitly telling Google to skip these pages.

Every page that should be indexed but isn’t is a potential customer search result that will never show your business. If your pricing page, services page, or key blog posts are excluded, you are invisible for the exact searches you need to win.

2. Audit Your robots.txt File

In simple words, robots.txt is a plain text file at your domain that tells search engine crawlers which parts of your site they are allowed to access. It is one of the most powerful files on your website, but a lot of people often misconfigure it.

A single incorrect line in robots.txt can block your entire website from Google. It happens more often than most business owners realize.

How to check

• Visit yourdomain.com/robots.txt and read every line. 
• Look for any “Disallow” directives that might be blocking important sections.
• Confirm that AI crawlers are not blocked if you want visibility on AI platforms.

Blocking the wrong directories can make entire sections of your website invisible for months. So, ensure you do things right. 

3. Check and Submit Your XML Sitemap

An XML sitemap is a file that lists all the important pages on your website and tells Google they exist. It is your website’s table of contents for search engines.

Without a sitemap, Google discovers your pages by following links. However, a sitemap is a direct instruction that indicates the pages you are considering for indexing. Research suggests broken or missing sitemaps appear on roughly one in four websites audited.

Confirm if your sitemap exists, loads correctly, and contains the pages you want indexed. Then in Google Search Console, go to Sitemaps and verify if it has been submitted and that Google is processing it without errors.

4. Fix Broken Links and 404 Errors

A 404 error occurs when a user or search engine crawler follows a link to a page that no longer exists. Broken links are one of the most common technical SEO issues. According to an analysis of over 50,000 domains, statistics show that this error appears on over half of all websites.

No one likes a broken link because it creates dead ends for both visitors and Google’s crawler. Internally, they waste crawl budget on pages that return nothing. For visitors, they remove trust instantly after clicking a link that signals a neglected website.

So, use Google Search Console’s Pages report to find 404 errors.

How to fix:

• For broken internal links, you can restore the deleted page or redirect the old URL to a relevant replacement with a 301 redirect
• For broken external links, you can find a working replacement URL or remove the link entirely. 

5. Resolve Redirect Chains and Loops

A redirect chain occurs when a URL redirects to another URL which redirects to another, rather than reaching the final destination directly. A redirect loop occurs when URLs redirect to each other in a circle with no exit.

Each redirect will slow down the page, waste crawl budget, and dilute the link equity passed through the chain. About 12% of websites have redirect chains or loops affecting their performance. For visitors, redirect chains mean slower page loads. For Google, it means wasted resources that could be used to crawl your most important pages.

You can use Screaming Frog to crawl your site and look for redirect chains. Google Search Console will also flag some redirect issues.

The way to fix this si to update internal links and redirects to point directly to the final destination URL. If Page A redirects to Page B which redirects to Page C, update Page A’s redirect to go straight to Page C.

6. Verify If HTTPS Is Active Across All Pages

HTTPS (Hypertext Transfer Protocol Secure) encrypts the connection between your website and visitors. The reason is to protect data, and Google has been using HTTPS as a ranking signal since 2014.

Browsers actively warn visitors when a site isn’t secure, and most people leave immediately when they see that warning. Google also uses HTTPS as a ranking signal, giving secure sites an advantage. More importantly, a site that isn’t HTTPS signals to every visitor that you haven’t maintained your website properly.

Look at your URL bar. If it shows a padlock icon, you are on HTTPS. If it shows “Not Secure,” you have an urgent problem to fix. Also check that ALL pages use HTTPS and that HTTP versions of your URLs automatically redirect to HTTPS with a 301.

7. Fix Duplicate URL Versions of Your Site

Your website might be accessible through multiple URL variations. It could be with or without www, HTTP, HTTPS, or trailing slashes. To Google, each of these is technically a different website displaying duplicate content.

According to an analysis of over 50,000 domains, study found that 27% of websites had both HTTP and HTTPS versions accessible simultaneously. However, when Google encounters duplicate versions of your site, it has to guess which one is the “real” version. As such, it may split the authority and signals it assigns between versions rather than consolidating them on one.

8. Improve Page Loading Speed

Page speed measures how quickly your website loads for visitors. Google has confirmed page speed as a ranking factor, and it has a direct impact on how many visitors stay long enough to become customers.

Research consistently shows that a one-second delay in page load time reduces conversions by approximately 7%. A site that takes five seconds to load loses roughly half its visitors before they see a single word. Slow loading affects not just rankings but the fundamental question of whether anyone reads your content at all.

You can use Google PageSpeed Insights to determine your load time. Enter your URL and review the scores for both mobile and desktop. Pay attention to the diagnostics section.

Common fixes that produce the biggest improvements:

• Compress and resize images before uploading.
• Convert images to modern formats (WebP instead of JPEG/PNG).
• Defer loading of JavaScript that isn’t needed immediately.
• Use browser caching so returning visitors load your site faster.
• Upgrade to faster hosting if your server response time is above 200ms.

9. Confirm Your Site Is Mobile-Friendly

Mobile-friendliness refers to how well your site displays and functions on smartphones. Google uses mobile-first indexing, which evaluates the mobile version of your site when determining rankings.

More than half of all searches happen on mobile devices. If your site works beautifully on desktop but breaks on a phone, Google is evaluating the broken version when deciding where you rank.

How to confirm if your site is mobile-friendly; 

• Open your site on an actual smartphone. 
• Navigate through your main pages. 
• Is the text readable without zooming? 
• Are buttons large enough to tap comfortably? 
• Do forms work? Does the navigation make sense on a small screen?

Also check Google Search Console’s Mobile Usability report for specific flagged issues like text too small to read, clickable elements too close together, or content wider than the screen.

10. Fix Core Web Vitals Failures

Core Web Vitals include three specific metrics Google uses to measure user experience. These are; 

1. Largest Contentful Paint (LCP)
2. Interaction to Next Paint (INP), and 
3. Cumulative Layout Shift (CLS).

Google uses Core Web Vitals as a ranking factor. More importantly, they measure experiences that directly affect whether visitors stay and convert. Analysis of more than 50,000 domains found that 96% had at least one page failing the Core Web Vitals assessment. That means it is one of the most universal technical SEO issues.

Google Search Console’s Core Web Vitals report shows your performance using real user data. PageSpeed Insights shows lab-measured scores with specific recommendations. Field data from real users is what matters most for rankings.

11. Review and Fix Canonical Tags

A canonical tag is an HTML element that tells Google which version of a URL is the “official” one when multiple URLs display similar or identical content. Without canonical tags, Google may decide for itself which version of your content to index and rank. Every indexable page should have a self-referencing canonical tag. Inconsistencies between canonical tags, sitemaps, and internal links create confusion that dilutes your SEO signals.

12. Audit Title Tags and Meta Descriptions

Title tags are the clickable headlines that appear in Google search results. Meta descriptions are the brief summaries that appear below them. Together, they are what searchers see before deciding whether to visit your site.

According to an analysis of over 50,000 websites, 70% of these had no meta descriptions, and 10% had no title tags on some pages. Missing or duplicate title tags make it harder for Google to understand what each page is about. Also, weak or missing meta descriptions reduce click-through rates from search results. That means that you might rank but still lose the traffic.

You can use Google Search Console’s Search Results report to see the titles and descriptions Google is displaying. 

What good looks like:

• Title tag: 50–60 characters, includes the primary keyword.
• Meta description: 120–155 characters, accurately summarizes the page, includes a reason to click.

13. Fix Duplicate Content

Duplicate content is content that appears in more than one place. This could appear on your own website or between your site and another. About 41% of websites have internal duplicate content issues.

When Google encounters duplicate content, it has to decide which version to index and rank. Often it picks the wrong one, or it distributes the SEO signals across multiple versions instead of concentrating them. Duplicate content doesn’t cause Google penalties in most cases. However, it does dilute your rankings and confuse what should be sending clear signals.

Common causes:

• www and non-www versions both accessible.
• Product pages accessible via multiple URL structures.
• Printer-friendly page versions.
• Session IDs or tracking parameters creating URL variations.
• Pagination issues.

The solution;

• Implement canonical tags pointing to the preferred version. 
• Set up 301 redirects from duplicate URLs to the canonical. 
• Use URL parameter handling in Google Search Console for parameter-based duplicates.

14. Improve Heading Structure

Headings (H1 through H6) provide hierarchical structure to your content. They help both visitors scan your pages and search engines understand the topic and structure of your content.

Every page should have exactly one H1 tag that clearly describes the main topic. Multiple H1s or a missing H1 creates structural confusion. Beyond SEO, good heading structure is fundamental to accessibility. It helps screen readers navigate pages and encourages users to remain on the site.

Use your browser’s developer tools to inspect any page’s heading structure. Ensure it follows a logical hierarchy that doesn’t skip levels. Also ensure your H1 text includes the primary keyword.

15. Fix Orphan Pages

An orphan page is a page on your website that has no internal links pointing to it from elsewhere. Google can only discover it through your sitemap, but it cannot be reached by following links from other pages.

If your own website doesn’t link to a page, you are implicitly telling Google that page doesn’t matter. Orphan pages are crawled less frequently, accumulate less internal authority, and rank poorly regardless of content quality. 

The best way to fix this is to add internal links from relevant pages to any orphan pages you want Google to prioritize. Ensure every important page on your site is reachable by following links from your homepage within three to four clicks.

16. Strengthen Internal Linking

Internal linking is the practice of linking from one page on your site to another. It is how authority flows through your website and how Google understands the relationship between your content.

Internal links do three things simultaneously: 

• They help Google discover your content.
• They signal which pages are most important by how frequently and prominently they’re linked to 
• They guide visitors to the next logical step in their journey to directly affect conversions.

What good internal linking looks like:

• Important pages (services, contact, key articles) receive more internal links than less important pages
• Anchor text describes the destination page using natural language.
• Blog posts link naturally to relevant service pages and other related articles
• No page has excessive outgoing links (more than 100–150 is a signal of over-optimization)

17. Add and Validate Structured Data

Structured data (schema markup) is code added to your pages that explicitly tells search engines what type of content they’re looking at. It uses standardized vocabulary from Schema.org. Structured data increases your eligibility for rich results.

Schema types most relevant for most businesses:

• Organization: Your business name, website, and contact info.
• FAQPage: Question-and-answer sections on any page.
• Article: Blog posts and educational content.
• LocalBusiness: For businesses with a physical location.
• Product: For e-commerce product pages.
• HowTo: For step-by-step guide content.

18. Check for Server Errors (5xx)

5xx errors are server-level errors that indicate that something went wrong on its end when trying to fulfill a request. Common examples are 500 (internal server error), 502 (bad gateway), 503 (service unavailable), and 504 (gateway timeout).

Server errors prevent Google from crawling your pages. If Google repeatedly encounters 5xx errors when trying to crawl your site, it may reduce how frequently it crawls and fresh content takes longer to be indexed. 

19. Review Google Search Console Regularly

Google Search Console (GSC) is a free tool from Google that shows how your website performs in search. It shows what you rank for, which pages are indexed, what errors exist, and how often people click your results.

GSC is the closest thing to Google telling you directly what it thinks of your website. If you are running an SEO strategy without regularly checking GSC, you are making decisions based on assumptions rather than data.

What to check monthly:

• Pages report.
• Core Web Vitals report
• Manual Actions
• Sitemaps report
• Search Results

20. Audit AI Crawler Access and AEO Readiness

As buyers increasingly search through AI platforms, the technical infrastructure that determines whether AI systems can find, read, and cite your content has become as important as traditional search crawler access.

If you are invisible to AI search platforms, you are missing a growing share of the buying decisions being made in your market. Unlike traditional SEO, this gap is still largely unaddressed by most businesses. So, get in today.

Frequently Asked Questions About Technical SEO Checklist

Here are some of the frequently asked questions about the technical SEO checklist; 

Question 1: What is a technical SEO audit?

A technical SEO audit is a systematic review of the technical elements of a website that affect how search engines crawl, index, and rank its pages. 

Question 2: How often should I do a technical SEO audit? 

A comprehensive audit should be done once a year or after any significant website change.

Question 3: What is the most common technical SEO mistake?

Based on analysis of thousands of websites, the most common high-impact issues are broken internal links, orphan pages, missing meta descriptions, and duplicate content.

Question 4: Do I need a developer to fix technical SEO issues? 

Some issues, like page speed optimization, server configuration, and JavaScript rendering problems, can require developer involvement. You can confirm and resolve others through your CMS or with free tools without developer help. If you need a developer’s assistance, contact Rankova.

Question 5: What is the difference between technical SEO and on-page SEO?

Technical SEO ensures search engines can access, crawl, and understand your website. On-page SEO focuses on the content and signals on individual pages.

Where to Start If This Feels Overwhelming

Of course, a 20-item checklist can seem like a lot to process. However, you can always start with item one and gradually proceed to others. Fix one category at a time. Track what you fix and when so you can measure the impact in Search Console.

If you would rather have a specialist identify exactly which issues are affecting your specific website, contact Rankova immediately. The audit process sufficiently identifies the challenge. 

At Rankova, we map your current technical health across traditional search and AI platforms, prioritize every issue by its revenue impact, and show you what a clean technical foundation would unlock for your business. Let Rankova handle your SEO business for you today.

Book your free audit with Rankova.

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