What is conversion optimisation? Turning visitors into action
Most sites do not have a traffic problem. They have a conversion problem wearing a traffic problem's clothes. You can pour more visitors into a page that does not persuade, or you can fix the page and let every channel you already run work harder. Conversion optimisation is the second option, and it is almost always the cheaper one.
What is conversion optimisation?
Conversion optimisation — CRO for short — is the practice of increasing the share of your visitors who take the action you want, whether that is starting a trial, booking a call, or buying. It works on the traffic you already have. That is what makes it high leverage: a page that converts a little better lifts the return on every ad, every post and every search result at once, because they all land on the same page.
It is also the lens where a founder is least able to see their own site. After enough months inside a product you stop reading your homepage the way a stranger does. You know what the button means, so you cannot tell that a first-time visitor does not. Conversion work is largely the discipline of recovering that stranger's view and building the page for them instead of for you.
The anatomy of a page that converts
A page that converts is not clever. It is clear. Almost every high-converting page does the same handful of things, and almost every low-converting one fails at the same handful.
| Element | The question it answers |
|---|---|
| Value proposition | What is this, who is it for, and why should I care — answered above the fold, in plain words |
| A single obvious action | What do you want me to do next, made visually unmistakable and not competing with five other buttons |
| Proof | Why should I believe you — logos, numbers, testimonials, or work I can see |
| Low friction | What are you asking of me, and is it the least you could ask at this stage |
| Specificity | Does the copy say something a competitor could not paste onto their own page unchanged |
Where pages leak
The failures are predictable enough to list. If a page is underperforming, the cause is usually here.
- A hero that describes a category, not a product: "Revolutionise your workflow" tells a visitor nothing they can act on.
- No single next action — three equally weighted buttons is the same as no button, because the visitor has to choose and often chooses to leave.
- The ask before the value: a signup that demands a card before the product has shown it is worth one.
- No proof, or proof that is invisible: claims with nothing behind them, or testimonials buried below the fold nobody reaches.
- Copy written for the team that built it, in internal vocabulary a customer never uses.
How the audit scores conversion
Conversion is worth 35 of the audit's 100 points — tied with trust as the heaviest lens. It is scored against a fixed rubric: value-proposition clarity, call-to-action presence and hierarchy, social proof, friction, and the specificity of the copy. The same checks run against every site, which is the entire point — a conversion score only means something if the thing producing it did not move between your page and your competitor's.
Every conversion finding is pinned to the specific element that triggered it, with the fix attached. "The hero makes a category claim, not a product claim" is a note you can act on this afternoon. "Improve your messaging" is a note that survives in every audit ever written because it can never be wrong.
How to lift conversion
- Rewrite the hero to state the product, the audience and the outcome in plain words — the test is whether a competitor could paste it unchanged. If they could, it is not specific enough.
- Reduce the page to one primary action and make every other link visibly secondary, so the eye lands where you want it.
- Move your strongest proof up, and make it concrete — a real number or a real logo beats an adjective.
- Cut the ask to the minimum for this stage: show value before requesting a card, an email, or a long form.
- Read every line as a stranger and delete the internal vocabulary. If a first-time visitor would not use the word, neither should the page.
Frequently asked questions about conversion optimisation
Is conversion optimisation just A/B testing?
Testing is one tool, not the whole discipline. Before you can test meaningfully you need a page worth testing — clear value, one action, real proof. Most sites gain more from fixing obvious leaks than from testing button colours on a page that was never clear to begin with.
How much traffic do I need before CRO is worth it?
Less than people think. High-traffic sites can run statistically clean tests, but any site benefits from the fundamentals — clarity, a single action, proof, low friction. Those are judgment calls, not experiments, and they help from your first visitor.
What is the single most common conversion mistake?
A hero that describes a category instead of a product. "Revolutionise your workflow" could sit on forty thousand homepages. A visitor cannot act on a claim that is not about anything specific.
Does the free audit check conversion?
Yes — it is the heaviest lens alongside trust, worth 35 points. The audit scores value-proposition clarity, call-to-action hierarchy, social proof, friction and copy specificity, and pins each finding to the element that caused it.
Related guides
- TrustWhat is taste?Taste is the judgment that separates considered design from template and AI slop. What slop looks like, what craft looks like, and how the audit tells them apart.
- SEOWhat is SEO?Search engine optimisation is the practice of making your site easy to find and rank in search. Its three pillars, and why it is still the foundation for AEO and GEO.
- AEOWhat is AEO?Answer engine optimisation is the practice of getting AI assistants to read, understand and cite your site. What it is, how citation works, and how to improve it.
See how your site scores on all of this.
The free audit runs the AI-visibility checks from these guides against your homepage and returns a scored, specific checklist in about sixty seconds.
Run a free audit