SEO
How to Complete a Technical SEO Audit in 8 Steps
For someone performing their first technical SEO audit, the results can be both overwhelming and intimidating. Often, you can’t see the wood for the trees and have no idea how to fix things or where to even begin.
After years of working with clients, especially as the head of tech SEO for a U.K. agency, I’ve found technical SEO audits to be a near-daily occurrence. With that, I know how important it is, especially for newer SEOs, to understand what each issue is and why it is important.
Understanding issues found within a technical audit allows you to analyze a site fully and come up with a comprehensive strategy.
In this guide, I am going to walk you through a step-by-step process for a successful tech audit but also explain what each issue is and, perhaps more importantly, where it should lie on your priority list.
Whether it’s to make improvements on your own site or recommendations for your first client, this guide will help you to complete a technical SEO audit successfully and confidently in eight steps.
But first, let’s clarify some basics.
Technical SEO is the core foundation of any website. A technical SEO audit is an imperative part of site maintenance to analyze the technical aspects of your website.
An audit will check if a site is optimized properly for the various search engines, including Google, Bing, Yahoo, etc.
This includes ensuring there are no issues related to crawlability and indexation that prevent search engines from allowing your site to appear on the search engine results pages (SERPs).
An audit involves analyzing all elements of your site to make sure that you have not missed out on anything that could be hindering the optimization process. In many cases, some minor changes can improve your ranking significantly.
Also, an audit can highlight technical problems your website has that you may not be aware of, such as hreflang errors, canonical issues, or mixed content problems.
Generally speaking, I always like to do an initial audit on a new site—whether that is one I just built or one I am seeing for the first time from a client—and then audits on a quarterly basis.
I think it is advisable to get into good habits with regular audits as part of ongoing site maintenance. This is especially if you are working with a site that is continuously publishing new content.
It is also a good idea to perform an SEO audit when you notice that your rankings are stagnant or declining.
What do you need from a client before completing a technical audit?
Even if a client comes to me with goals that are not necessarily “tech SEO focused,” such as link building or creating content, it is important to remember that any technical issue can impede the success of the work we do going forward.
It is always important to assess the technical aspects of the site, offer advice on how to make improvements, and explain how those technical issues may impact the work we intend to do together.
With that said, if you intend on performing a technical audit on a website that is not your own, at a minimum, you will need access to the Google Search Console and Google Analytics accounts for that site.
For the most part, technical SEO audits are not easy. Unless you have a very small, simple business site that was perfectly built by an expert SEO, you’re likely going to run into some technical issues along the way.
Often, especially with more complex sites, such as those with a large number of pages or those in multiple languages, audits can be like an ever-evolving puzzle that can take days or even weeks to crack.
Regardless of whether you are looking to audit your own small site or a large one for a new client, I’m going to walk you through the eight steps that will help you to identify and fix some of the most common technical issues.
Step 1. Crawl your website
All you need to get started here is to set up a project in Ahrefs’ Site Audit, which you can even access for free as part of Ahrefs Webmaster Tools.
This tool scans your website to check how many URLs there are, how many are indexable, how many are not, and how many have issues.
From this, the audit tool creates an in-depth report on everything it finds to help you identify and fix any issues that are hindering your site’s performance.
Of course, more advanced issues may need further investigation that involves other tools, such as Google Search Console. But our audit tool does a great job at highlighting key issues, especially for beginner SEOs.
First, to run an audit with Site Audit, you will need to ensure your website is connected to your Ahrefs account as a project. The easiest way to do this is via Google Search Console, although you can verify your ownership by adding a DNS record or HTML file.
Initially, after running the audit, you will be directed to the “Overview” page. This will give you a top-level view of what the tool has found, including the number of indexable vs. non-indexable pages, top issues, and an overall website health score out of 100.
This will give you a quick and easy-to-understand proxy metric to the overall website health. From here, you can head over to the “All issues” tab. This breaks down all of the problems the crawler has found, how much of a priority they are to be fixed, and how to fix them.
This report, alongside other tools, can help you to start identifying the issues that may be hindering your performance on the SERPs.
If your site has pages that can’t be crawled by search engines, your website may not be indexed correctly, if at all. If your website does not appear in the index, it cannot be found by users.
Ensuring that search bots can crawl your website and collect data from it correctly means search engines can accurately place your site on the SERPs and you can rank for those all-important keywords.
There are a few things you need to consider when looking for crawlability issues:
Priority: High
Ensuring your pages are indexed is imperative if you want to appear anywhere on Google.
The simplest way to check how your site is indexed is by heading to Google Search Console and checking the Coverage report. Here, you can see exactly which pages are indexed, which pages have warnings, as well as which ones are excluded and why:
Note that pages will only appear in the search results if they are indexed without any issues.
If your pages are not being indexed, there are a number of issues that may be causing this. We will take a look at the top few below, but you can also check our other guide for a more in-depth walkthrough. Priority: High
The robots.txt file is arguably the most straightforward file on your website. But it is something that people consistently get wrong. Although you may advise search engines on how to crawl your site, it is easy to make errors.
Most search engines, especially Google, like to abide by the rules you set out in the robots.txt file. So if you accidentally tell a search engine not to crawl and/or index certain URLs or even your entire site, that’s what will happen.
This is what the robots.txt file, which tells search engines not to crawl any pages, looks like:
Often, these instructions are left within the file even after the site goes live, preventing the site from being crawled. This is a rare easy fix that acts as a panacea to your SEO.
You can also check whether a single page is accessible and indexed by typing the URL into the Google Search Console search bar. If it’s not indexed yet and it’s accessible, you can “Request Indexing.”
Priority: High
A robots meta tag is an HTML snippet that tells search engines how to crawl or index a certain page. It’s placed into the <head> section of a webpage and looks like this:
This noindex is the most common one. And as you’ve guessed, it tells search engines not to index the page. We also often see the following robots meta tag on pages across whole websites:
This tells Google to use any of your content freely on its SERPs. The Yoast SEO plugin for WordPress adds this by default unless you add noindex or nosnippet directives.
If there are no robots meta tags on the page, search engines consider that as index, follow, meaning that they can index the page and crawl all links on it. But noindex actually has a lot of uses:
But improper use also happens to be a top indexability issue. Using the wrong attribute accidentally can have a detrimental effect on your presence on the SERPs, so remember to use it with care.
Priority: High
An XML sitemap helps Google to navigate all of the important pages on your website. Considering crawlers can’t stop and ask for directions, a sitemap ensures Google has a set of instructions when it comes to crawling and indexing your website.
But much like crawlers can be accidentally blocked via the robots.txt file, pages can be left out of the sitemap, meaning they likely won’t get prioritized for crawling.
Also, by having pages in your sitemap that shouldn’t be there, such as broken pages, you can confuse crawlers and affect your crawl budget (more on that next).
You can check sitemap issues in Site Audit: Site Audit > All issues > Other. The main thing here is to ensure that all of the important pages that you want to have indexed are within your sitemap and avoid including anything else.
Priority: High (for large websites)
A crawl budget refers to how many pages and how rapidly a search engine can crawl.
A variety of things influence the crawl budget. These include the number of resources on the website, as well as how valuable Google deems your indexable pages to be.
Having a big crawl budget does not guarantee that you will rank at the top of the SERPs. But if all of your critical pages are not crawled due to crawl budget concerns, it is possible that those pages may not be indexed.
Your pages are likely being scanned as part of your daily crawl budget if they are popular, receive organic traffic and links, and are well-linked internally across your site.
New pages—as well as those that are not linked internally or externally, e.g., those found on newer sites—may not be crawled as frequently, if at all. For larger sites with millions of pages or sites that are often updated, crawl budget can be an issue. In general, if you have a large number of pages that aren’t being crawled or updated as frequently as you want, you should think about looking to speed up crawling.
Using the Crawl Stats report in Google Search Console can give you insight into how your site is being crawled and any issues that may have been flagged by the Googlebot.
You will also want to look into any flagged crawl statuses like the ones shown here:
It is important to check your on-page fundamentals. Although many SEOs may tell you that on-page issues like those with meta descriptions aren’t a big deal, I personally think it is part of good SEO housekeeping.
Even Google’s John Mueller previously stated that having multiple H1 tags on a webpage isn’t an issue. However, let’s think about SEO as a points system.
If you and a competitor have sites that stand shoulder to shoulder on the SERP, then even the most basic of issues could be the catalyst that determines who ranks at the top. So in my opinion, even the most basic of housekeeping issues should be addressed.
So let’s take a look at the following:
Priority: Medium
Title tags have a lot more value than most people give them credit for. Their job is to let Google and site visitors know what a webpage is about—like this: In recent years, title tags have sparked a lot of debate in the SEO world. Google, it turns out, is likely to modify your title tag if it doesn’t like it.
Priority: Low A meta description is an HTML attribute that describes the contents of a page. It may be displayed as a snippet under the title tag in the search results to give further context.
You can find out if any meta descriptions are missing, as well as if they are too long or too short.
Priority: High
A canonical tag (rel=“canonical”) specifies the primary version for duplicate or near-duplicate pages. To put it another way, if you have about the same content available under several URLs, you should be using canonical tags to designate which version is the primary and should be indexed. If spiders are wasting their time crawling duplicate pages, it can mean that valuable pages are being missed.
You can find duplicate content issues in Site Audit: Site Audit > Reports > Duplicates > Issues.
Priority: High
Although hreflang is seemingly yet another simple HTML tag, it is possibly the most complex SEO element to get your head around.
TBH hreflang is one of the most complex aspects of SEO (if not the most complex one). Feels as easy as a meta-tag, but it gets really hard quickly.
— 🐝 johnmu.xml (personal) 🐝 (@JohnMu) February 19, 2018 The hreflang tag is imperative for sites in multiple languages. If you have many versions of the same page in a different language or target different parts of the world—for example, one version in English for the U.S. and one version in French for France—you need hreflang tags.
Translating a website is time consuming and costly—because you’ll need to put in effort and ensure all versions show up in the relevant search results. But it does give a better user experience by catering to different users who consume content in different languages.
Plus, as clusters of multiple-language pages share each other’s ranking signals, using hreflang tags correctly can have a direct impact as a ranking factor. This is alluded to by Gary Illyes from Google in this video.
You can find hreflang tag issues in Site Audit under localization: Site Audit > All issues > Localization.
Priority: High
Structured data, often referred to as schema markup, has a number of valuable uses in SEO. Most prominently, structured data is used to help get rich results or features in the Knowledge Panel. Here’s a great example: When working with recipes, more details are given about each result, such as the rating.
Nowadays, JSON-LD is the preferred format for structured data, so keep it that way if possible. But you can also encounter Microdata and RDFa.
As part of your technical audit, you should be testing your structured data. A great tool for this is the Classy Schema testing tool.
Image optimization is often overlooked when it comes to SEO. However, image optimization has a number of benefits that include:
Image issues can be found in the main audit report: Site Audit > Reports > Images.
Priority: High
Broken images cannot be displayed on your website. This makes for a bad user experience in general but can also look spammy, giving visitors the impression that the site is not well maintained and professional.
This can be especially problematic for anyone who monetizes their website, as it can make the website seem less trustworthy.
Priority: High
Large images on your website can seriously impact your site speed and performance. Ideally, you want to display images in the smallest possible size and in an appropriate format, such as WebP. The best option is to optimize the image file size before uploading the image to your website. Tools like TinyJPG can optimize your images before they’re added to your site.
If you are looking to optimize existing images, there are tools available, especially for more popular content management systems (CMSs) like WordPress. Plugins such as Imagify or WP-Optimize are great examples.
Priority: Medium
HTTPS pages that link to HTTP images cause what is called “mixed content issues.” This means that a page is loaded securely via HTTPS. But a resource it links to, such as an image or video, is on an insecure HTTP connection.
Mixed content is a security issue. For those who monetize sites with display ads, it can even prevent ad providers from allowing ads on your site. It also degrades the user experience of your website.
By default, certain browsers restrict unsafe resource requests. If your page relies on these vulnerable resources, it may not function correctly if they are banned. Priority: Low
Alt text, or alternative text, describes an image on a website. It is an incredibly important part of image optimization, as it improves accessibility on your website for millions of people throughout the world who are visually impaired.
Often, those with a visual impairment use screen readers, which convert images into audio. Essentially, this is describing the image to the site visitor. Properly optimized alt text allows screen readers to inform site users with visual impairments exactly what they are seeing.
Alt text can also serve as anchor text for image links, help you to rank on Google Images, and improve topical relevance.
When most people think of “links” for SEO, they think about backlinks. How to build them, how many they should have, and so on.
What many people don’t realize is the sheer importance of internal linking. In fact, internal links are like the jelly to backlinks’ peanut butter. Can you have one without the other? Sure. Are they always better together? You bet! Not only do internal links help your external link building efforts, but they also make for a better website experience for both search engines and users.
The proper siloing of topics using internal linking creates an easy-to-understand topical roadmap for everyone who comes across your site. This has a number of benefits:
Priority: High
Go to Site Audit > Internal pages > Issues tab > 4XX page.
These are problematic because they waste “link equity” and provide users with a negative experience.
Here are a few options for dealing with these issues:
Priority: High
Go to Site Audit > Links > Issues tab > Orphan page (has no incoming internal links).
There are two reasons why indexable pages should not be orphaned:
If your website has multiple orphaned pages, filter the list from high to low for organic traffic. If internal links are added to orphaned pages still receiving organic traffic, they’ll certainly gain far more traffic.
External links are hyperlinks within your pages that link to another domain. That means all of your backlinks—the links to your website from another one—are someone else’s external links. See how the magic of the internet is invisibly woven together? *mind-blown emoji*
External links are often used to back up sources in the form of citations. For example, if I am writing a blog post and discussing metrics from a study, I’ll externally link to where I found that authoritative source.
Linking to credible sources makes your own website more credible to both visitors and search engines. This is because you show that your information is backed up with sound research.
Here’s what John said about external links:
Step 2. Spotting crawlability and indexation issues
Identifying indexation issues
Checking the robots.txt file
Robots meta tags
<meta name="robots" content="noindex" />
<meta name="robots" content=”max-snippet:-1, max-image-preview:large, max-video-preview:-1" />
Checking the sitemap
Checking the crawl budget
Step 3. Checking technical on-page elements
Page titles and title tags
<title>How to Craft the Perfect SEO Title Tag (Our 4-Step Process)</title>
Meta descriptions
Check canonical tags
International SEO: hreflang tags
Structured data
Step 4. Identifying image issues
Broken images
Image file size too large
HTTPS page links to HTTP image
Missing alt text
Step 5. Analyzing internal links
4xx status codes
Orphan pages
Step 6. Checking external links
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