An SEO audit is a structured look at why a site is not performing as well as it should. Done well it produces a short list of things to fix, in order. Done badly it produces a two hundred page report nobody acts on.
This article gives you the order that finds the expensive problems first. You can run most of it yourself.
Start the SEO audit with indexing
Nothing else matters if your pages are not in the index. So begin there, because it is also the cheapest thing to check.
Open Search Console and look at the page indexing report. It lists which pages are indexed, which are not, and usually why. Common reasons include a page being blocked, carrying a no index instruction left over from development, or being treated as a duplicate of another page.
Make a list of the important pages that are missing. That list is often the entire finding of the audit, and everything else is decoration.
Look for duplicated addresses
One page reachable at several addresses splits its own authority. Check whether your site answers on both www and the bare domain, whether it answers with and without a trailing slash, and whether filters or tracking parameters create endless variations.
Whatever you find, the fix is the same shape. Pick one address as the real one, redirect the rest to it permanently, and declare the canonical version on the page.
Measure speed on a phone
Test your most important pages on a mobile connection rather than on office broadband, which flatters everything. Large uncompressed images cause most of the damage on most sites, followed by scripts that are loaded on every page but used on one.
Note the numbers, then move on. Speed work is worth doing, and it is rarely the reason a site ranks badly.
Read the content as a visitor would
This is the part an automated SEO audit tool cannot do, and it is usually where the real answers are. Take your ten most important pages and ask three questions of each.
- Does this page answer the question somebody searched for, in its first paragraph?
- Is there a better page already ranking for that phrase, and if so, why is it better?
- Would a stranger know what to do next after reading it?
Be honest. A page that is thinner than everything on the first page of results is not a technical problem and no amount of tinkering will fix it. Instead, the fix is editorial, and what a search engine is trying to reward explains why.
Check the links inside your own site
Internal links are free and most sites waste them. Look for important pages that nothing links to, pages that link to nothing, and navigation that buries your best content four clicks deep.
Meanwhile, check that links use descriptive words. A page linked only as "read more" tells a search engine nothing about what it contains.
Look at what the search data already says
Search Console shows the phrases that bring people to you and where you rank for each. Two patterns are worth hunting for in every SEO audit.
First, phrases where you sit around positions five to fifteen. Those pages are close, and improving one is usually cheaper than writing a new one. Second, phrases bringing people to a page that does not really answer them, which is a request for a page you have not written yet.
Turn the SEO audit into a short list
A finding is only useful if somebody can act on it. So write each one as a sentence naming the page, the problem and the fix, and then order the list by how much it will change and how little it will cost.
Three to five items is a good audit. If your list has forty, you have written a description of a website rather than a plan for improving one.
Check the site on a phone, by hand
Automated tools report mobile problems as scores, which hides the ones that actually cost you customers. So open your three most important pages on an ordinary phone and use them properly.
Is the text readable without pinching? Are buttons far enough apart to tap without care? Does anything run off the side of the screen? Does the cookie banner cover the content and refuse to go away? Each of those loses visitors regardless of where you rank, and none of them shows up as a technical error.
Search engines evaluate the mobile version of a site, so anything hidden on mobile is effectively hidden altogether. That makes this ten minutes well spent in any SEO audit.
How often to repeat it
Once or twice a year suits most sites, plus a check immediately after any redesign, migration or platform change. Those three events cause most technical damage, because they change addresses and settings that nobody thinks to review afterwards.
Frequently asked questions
What is an SEO audit?
It is a structured review of why a site is not performing as well as it should in search. A good one produces a short ordered list of specific fixes. A poor one produces a very long report that nobody acts on, which is the more common outcome.
Can I run an SEO audit myself?
Most of it, yes. Search Console tells you what is indexed and why. Reading your own most important pages honestly, and comparing them with what already ranks, needs judgement rather than tools. Some fixes will need a developer even though finding them does not.
What should an SEO audit check first?
Indexing, always. A page that is not in the index cannot rank however good it is, and checking takes minutes. Duplicated addresses come second, because one page reachable at several addresses divides whatever authority it has earned.
How long should an SEO audit take?
A focused review of a small site takes a day or so. Anything much longer is usually producing detail rather than decisions. The test of length is whether the output is a list somebody can start working through tomorrow morning.
Do I need a paid tool to run an SEO audit?
No. Search Console is free and answers the most important questions. Paid crawlers save time on larger sites by finding broken links and duplicate titles quickly, but they cannot judge whether a page actually answers the question somebody asked.
How many findings should an SEO audit produce?
Three to five that genuinely matter. A list of forty findings is a description of a website rather than a plan for improving one, and long lists tend to be abandoned. Order what you find by effect first and effort second.
How often should I audit my site?
Once or twice a year for most sites, and always straight after a redesign, a migration or a platform change. Those three events cause the majority of technical problems, because they alter addresses and settings that nobody reviews afterwards.
What is the most common finding?
Content that is thinner than what already ranks for the same phrase. It looks like a technical problem because the page is not ranking, but no amount of tag tidying fixes it. The second most common is important pages that nothing internally links to.