An SEO audit is a methodical review of your site that identifies what stops it from ranking higher on Google and what to fix first. It examines three dimensions: the technical foundation (indexing, speed, mobile display), the content (keywords and page quality), and the popularity (the links pointing to you). You can do a good part of it yourself with free tools, or hand a full audit to a professional for a budget that usually runs from 800 to 2,500 francs. Here’s the step-by-step method, the tools that actually work, and how to turn your findings into a concrete action plan.
What is an SEO audit?
An SEO audit is a complete diagnosis of how visible your site is on search engines. It measures the gap between what your site does today and what Google expects in order to rank it among the top results, then lists the concrete fixes that will move your pages up.
In practice, an audit examines three broad dimensions, the same ones that make up all of search optimization. The first is the technical foundation: Google has to be able to crawl your site, understand each page, and render it quickly, or the best content in the world stays invisible. The second is the content: your pages have to answer precisely what people type into the search bar, with the depth and clarity they expect. The third is the popularity: the links other sites make to yours act as recommendations and weigh heavily in the ranking. These three dimensions map onto the three families of SEO, on-page, off-page, and technical, which we’ll walk through one by one.
An SEO audit is different from a broader website audit, which also covers security, design, and the general experience. The SEO audit focuses only on visibility in search results. It’s also not a cosmetic check you run once to tick a box, but a starting point that leads to measurable action, with a before and an after you can track in your own analytics.
Why and when should you run an SEO audit?
An SEO audit helps you understand why your site doesn’t get the traffic it deserves, and above all where to start fixing it. Without that diagnosis, you correct at random, moving commas while the real problem stays intact, and you end up believing that SEO doesn’t work when you never really worked it in the first place.
Several situations call for an audit without delay. The most common is traffic that stalls or slips while you publish regularly: the content goes nowhere because a technical or strategic brake is holding it back. A site redesign is another critical moment, because changing your structure without an SEO plan often loses positions you fought hard to earn. A domain change, a move to a new host, or a new content management system all call for a full check too, as does launching a brand-new site you want to set on the right track from day one.
Beyond these triggers, an annual review keeps your site healthy. Google changes its criteria several times a year, your competitors keep moving, and technical errors pile up quietly. An audit once a year is enough for a stable showcase site, while an e-commerce site or one that publishes a lot benefits from a review every six months. The logic stays the same: better to catch a problem when it costs an hour to fix than when it has already pushed you onto page two.
How do you audit the technical side of your site?
A technical SEO audit checks that Google can crawl, understand, and quickly render your pages, because that’s the foundation everything else rests on. A site Google struggles to read will never rank, no matter how good its content is.
The first thing to check is indexing, meaning the pages Google has actually recorded. In Search Console, the coverage report shows you the indexed pages and the excluded ones, with the reason for each exclusion. A quick check you can do yourself is to type the site:yourdomain.com command into Google, which shows how many pages the engine knows about: if you know you have fifty pages and Google shows only twelve, you have already found a serious problem. You verify along the way that your sitemap file lists all the important pages and that the robots.txt file doesn’t accidentally block part of the site. An important page missing from the index is a sale lost before it even started.
Next comes page speed, which Google measures directly through the Core Web Vitals: the loading time of the largest visible element, the responsiveness to the first clicks, and the visual stability of the page while it loads. A slow page on mobile loses half its visitors and slips in the results. You check in the same pass that the site displays correctly on a phone, since it’s the mobile version Google uses to rank, and that the HTTPS security certificate is in place, the minimum condition to earn the trust of both the browser and the engine.
That leaves the structure to review. Clean, readable page addresses, a consistent heading hierarchy, no broken links or 404 error pages, proper handling of redirects when an address changes, and no duplicate content across several addresses: these are the technical details that, taken together, separate a site Google crawls happily from one where it gets lost. On a site built with WordPress, an SEO audit adds a review of the installed plugins, because a poorly configured or heavy plugin often slows the whole thing down without the owner ever noticing.
How do you audit content and keywords?
A content audit checks that every page targets a real search and answers it better than the competing pages already ranking. This is the heart of search optimization, because Google mostly tries to send its users to the most useful answer to their question.
The starting point is search intent. For each page, you ask which precise query it targets and whether its content really matches what the person typing those words is looking for. A sales page trying to rank for a purely informational question is aiming at the wrong target and will never climb. You then map your keywords: ideally, each page targets a distinct main query, without two pages fighting over the same word, a common problem that makes your own pages compete against each other.
Then comes the page-by-page review, into the detail of each one. Title tags and meta descriptions have to contain the target keyword and make people want to click, the heading hierarchy has to structure the text logically, and the content has to be complete enough to cover the topic without drowning in filler. You spot the thin pages that add nothing, the passages that repeat from one page to another, and the important topics you have not covered yet. Competition between your own pages deserves special attention: if you wrote three articles all targeting “website creation”, Google doesn’t know which one to promote and all three suffer, whereas a single strong article would have ranked better. Spotting these duplicates and merging them often lifts a page within a few weeks, without writing a single line of new content. Internal linking, the links your pages make to one another, is part of this audit too: it helps Google understand which pages matter most and guides your visitors toward the logical next step in their reading.
How do you assess popularity and link building?
A popularity audit measures the quantity and above all the quality of the links other sites make to yours, because those links are among the strongest signals for Google. A link from a respected site acts as a public recommendation, and it’s often what separates two pieces of equivalent content.
You can already see part of your links for free, without a paid tool: Search Console offers a “Links” report that lists the referring sites and the most-linked pages on your domain. It’s a good starting point for a first audit, even if it stays less complete than the databases of Semrush or Ahrefs. In this part, you first look at the number of different domains pointing to you, which matters more than the total number of links, since a hundred links from a single site weigh less than ten links from ten serious sites. You then examine the quality of those referring sites: a link from a recognized outlet or a partner in your sector is worth far more than a link bought on a shady directory. You also check the text those links sit on, and you flag the toxic links, the ones from disreputable sites that can hurt rather than help.
The other half is comparing your link profile to that of your direct competitors. If the sites outranking you have three times as many referring domains as you do, you have a concrete explanation for your gap, and a clear line of action. This analysis connects to all the link building work you’ll do afterward to gain authority, a long game that builds over time and remains, alongside content, one of the two levers that truly move a ranking.
Which tools should you use, and is a free SEO audit worth it?
Google’s free tools cover the essentials of a first SEO audit, while paid tools automate the analysis at scale and save time on large sites. You can go a long way without spending a franc, as long as you accept doing part of the work by hand.
On the free side, four tools already form a complete kit. Google Search Console shows how Google sees your site, which pages are indexed, which queries you appear for, and at what position. Google Analytics tracks how visitors behave once they arrive. PageSpeed Insights measures the speed of your pages and gives precise improvement leads. And Bing Webmaster Tools adds a second opinion, useful on technical problems. To that you can add the free version of Screaming Frog, software that crawls your site the way Google does and surfaces the errors, with a limit of five hundred addresses, plenty for a showcase site.
Paid tools like Semrush, Ahrefs, or the full Screaming Frog license at around two hundred francs a year mainly bring two things: a database of links and keywords that Google doesn’t share, and the automation that makes an audit manageable on a site of several thousand pages. They’re valuable for a professional, less essential for a small site. As for the one-click free SEO audit offered by some sites, it gives a score and a list of alerts, which is a good starting point, but it shows the symptoms without saying which ones really matter or in what order to handle them. A score of sixty out of a hundred doesn’t tell you which fix will actually lift your page, and that’s exactly where human judgment takes over from the tool.
How much does an SEO audit cost, and how do you prioritize the fixes?
A professional SEO audit costs, in Switzerland, between 800 and 2,500 francs for a showcase site, more for an e-commerce site, and a basic technical audit sits around 200 to 500 francs. In France, a complete audit with an action plan usually runs between 1,000 and 3,000 euros, averaging around 2,000 euros. The price difference comes from the size of the site, the depth of the analysis, and the quality of the document delivered at the end.
| Audit type | What it covers | Price in Switzerland |
|---|---|---|
| Basic technical audit | Technical crawl, essential tags, page speed | 200 to 500 CHF |
| Complete audit | Technical, content and popularity, with a prioritized action plan | 800 to 2,500 CHF |
| Deep audit | Large e-commerce site, big architecture or redesign | 2,500 to 6,000 CHF |
Price isn’t everything: an audit that ends in a list of three hundred problems with no hierarchy is worth no more than a free automated report. What you pay a professional for is precisely the sorting, the ability to say which fixes will move your traffic and which can wait. A deep audit for a large e-commerce site or a redesign project climbs toward 2,500 to 6,000 francs, but for most sites belonging to freelancers and small businesses, a complete audit at the lower end of the range fits the need perfectly.
Once the audit is done, everything comes down to prioritization, and the simplest rule is to cross expected impact with the effort required. You always start with the high-impact, low-effort technical blockers: an important page blocked from indexing, a catastrophic loading time on mobile, a broken link on your home page. You move on to content, rewriting first the pages that already get impressions in Search Console without earning clicks, since they’re on the verge of taking off. Link building, slower to bear fruit, comes last once the foundations are sound. This translation of the diagnosis into an ordered series of actions is what separates a useful audit from a nice document nobody applies, and it’s also the moment when working with a website professional saves the most time. If you would rather move forward on your own, our guide to ranking your website on Google covers each of these actions in detail.
