A conversion rate optimisation audit is a structured review of your website that explains why visitors are not taking the action you want, whether that is buying, booking or filling in a form. It combines analytics data, behaviour recordings and a hands-on review of the pages that matter most, then turns what it finds into a prioritised list of fixes.
If you are spending money on traffic and the enquiries are not following, this is usually the fastest way to find out where the leak is.
Quick answer
A CRO audit checks four things: whether your tracking is accurate, where in the journey visitors drop off, what friction they hit on key pages (confusing copy, slow load, broken forms, weak calls to action), and what to fix first. A good audit ends with specific, prioritised recommendations rather than a generic list of "best practices".
What a conversion rate optimisation audit actually covers
A proper CRO audit is not someone giving your homepage a quick look and sharing opinions. It works through evidence in a set order.
1. Measurement check
Every recommendation depends on the numbers being right. Before anything else, the audit confirms:
- Your key events in GA4 (form submissions, purchases, calls, bookings) fire once, at the right moment, and only when the action genuinely happens
- Thank-you pages or confirmation states cannot be triggered by people refreshing or landing on them directly
- Consent settings are not silently blocking most of your data
- Traffic sources are attributed sensibly, not dumped into Direct or Unassigned
If conversions are double counted or missing, the "conversion rate" you are trying to improve is fiction. This is why tracking checks come first.
2. Funnel and drop-off analysis
Next, the audit maps the journey from landing to conversion and measures how many people make it through each step. This shows where the biggest losses are: the product page, the basket, a specific form field, or the step between a service page and the contact page. We cover the method in detail in our guide to funnel analysis in GA4.
3. Behaviour analysis
Numbers tell you where people leave. Behaviour tools tell you why. Using heatmaps and session recordings (Microsoft Clarity is a common choice as it is free), the audit looks for:
- Rage clicks: repeated clicking on something that does not respond
- Dead clicks: clicks on elements people assume are links or buttons
- Excessive scrolling or scrolling back up, which often signals people cannot find what they need
- Quick backs: visitors who land and leave almost immediately
- Form behaviour: which fields people hesitate on, abandon or get errors on
4. UX audit and landing page audit
This is the hands-on part. A reviewer goes through your key pages on mobile and desktop as a real customer would, checking:
- Is it clear within a few seconds what you offer, who it is for and what to do next?
- Is the main call to action visible without hunting for it?
- Does the page match the promise of the ad or search result that brought people there?
- Are trust signals present and believable: reviews, accreditations, guarantees, clear pricing or next steps?
- Are forms as short as they can be, with sensible field labels and helpful error messages?
- How quickly does the page load, especially on a mid-range phone on mobile data?
A landing page audit applies the same lens to paid traffic destinations, where message match and a single clear goal matter even more.
5. Prioritised recommendations
The output should rank fixes by likely impact and effort. A broken mobile form button is a quick, high-impact fix. A full redesign of the product page is not. You want to know which to do this week.
How to run a CRO audit: step by step
You can run a basic audit yourself if you have access to your analytics and a few hours. Here is the process.
- Define the conversion. Pick the one or two actions that actually make you money. Newsletter sign-ups and button clicks are not the same as qualified leads.
- Validate your tracking. Test each key event yourself using GA4 DebugView and Google Tag Manager preview mode. Submit a real form and check it appears once.
- Pull your baseline. Note your current conversion rate by device, traffic source and landing page over a meaningful period, ideally at least a few weeks so you are not reacting to noise.
- Find the biggest drop-off. Build a funnel exploration in GA4 and identify the step that loses the most people.
- Watch real sessions. Filter recordings to people who reached that step and left. Twenty or thirty recordings usually reveal a pattern.
- Review the pages yourself. Complete the journey on your own phone. Note everything that is slow, unclear or annoying.
- Segment. Compare mobile and desktop, new and returning visitors, paid and organic. Problems often hide inside one segment.
- Write hypotheses. Phrase each fix as "Because we saw X, we believe changing Y will improve Z."
- Prioritise. Score each by impact, confidence and effort, then start with the high-impact, low-effort items.
- Measure the result. Test where traffic allows, or compare before and after carefully where it does not.
Common problems a CRO audit uncovers
These issues come up again and again across all kinds of sites:
- Forms that break or behave differently on mobile
- Calls to action hidden below long hero images or sliders
- Pricing or next steps that are vague, so people leave to "think about it"
- Pages that load slowly because of oversized images or too many third-party scripts
- Cookie banners that cover the call to action on small screens
- Ad copy that promises one thing while the landing page talks about another
- Tracking that counts page views of a thank-you page rather than genuine submissions
CRO audit vs UX audit vs landing page audit
The terms overlap, so it is worth being clear:
- UX audit: focuses on usability and ease of use across the site. It may not be tied to commercial outcomes.
- Landing page audit: a focused review of one or a few pages, often the destinations for paid campaigns.
- CRO audit: ties everything back to conversions. It uses data to decide which usability issues actually cost you money and which can wait.
When should you get a CRO audit?
Consider one when:
- Traffic is steady or growing but enquiries or sales are flat
- You are about to increase ad spend and want to make sure the site can convert it
- You have launched a new site or redesign and performance dropped
- Your agency and your sales team disagree on lead quality or volume
- You have never checked what visitors actually do on the site
It is also worth reading what a good website conversion rate looks like before you start, so you set sensible expectations.
DIY or independent audit?
Doing it yourself is fine if you have time and are comfortable in GA4 and GTM. The risk is familiarity: it is hard to see friction on a site you built or look at every day. An independent audit brings fresh eyes and no incentive to sell you a redesign or an ongoing retainer. Agencies also use independent audits to sense-check client sites before taking on campaigns.
FAQs
How long does a CRO audit take?
A focused audit of a small or medium site typically takes a few days, depending on how much traffic and behaviour data is already available. If behaviour tracking needs installing first, you need to allow time for enough sessions to be recorded.
Do I need a lot of traffic for a CRO audit?
No. You need traffic to run statistically reliable A/B tests, but an audit works on lower volumes too. Recordings, a UX review and tracking checks reveal plenty of fixable issues without huge numbers.
What tools are used in a CRO audit?
Usually GA4 for funnels and conversion data, Google Tag Manager for checking event tracking, and a behaviour tool such as Microsoft Clarity for heatmaps and session recordings.
Will a CRO audit tell me exactly what to change?
A good one will. You should receive specific, prioritised recommendations tied to evidence, not a generic checklist.
Get an independent CRO audit
Our CRO & Behaviour Audit costs a fixed £229. We review session behaviour in Microsoft Clarity, map your funnel drop-off, identify UX friction and give you clear, prioritised recommendations. If you also want your tracking checked and fixed first, the Conversion Clarity bundle covers both for £379. No retainers, no sales pitch. Get My Audit.
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