Landing page design that converts: clarity, proof and one call to action

A landing page is a page built for one purpose: to get visitors who arrive from an advert, email or search result to take one action. Book a call, start a trial, download a guide, buy a product. Unlike a home page, it doesn’t need to explain everything the business does. It needs to answer the visitor’s questions about one offer and make the next step obvious.

This guide covers the three things that do most of the work (clarity, proof and a single call to action), the UK rules that apply to reviews and urgency claims, and how to test changes without fooling yourself. You won’t find promised conversion rates here. They vary too much by market, offer and traffic to be useful as targets.

Clarity: say what it is in the first screen

Visitors decide quickly whether a page is relevant. NN/g’s eyetracking research on scrolling and attention found that people spent about 57% of their page-viewing time above the fold and 74% in the first two screenfuls. People do scroll, but attention drops sharply as they go.

That makes the opening screen the place for four things:

1. A headline that names the outcome. “Bookkeeping for sole traders, from £30 a month” beats “Your financial partner”.
2. A line of support that says who it is for and what happens next.
3. The call to action, visible without scrolling on a phone.
4. An image that shows the product or result, rather than generic stock photography.

Match the page to whatever sent the visitor there. If an advert promises a free audit, the page should be about the free audit, using the same words. Google describes landing page experience in its Quality Score help as how relevant and useful the page is to people who click your ad, and it is one of the three components of Quality Score.

Proof: show why someone should believe you

Visitors arrive sceptical. NN/g’s article on trustworthiness in web design lists four credibility factors that still hold: design quality, upfront disclosure, content that is complete, correct and current, and being connected to the rest of the web. In practice:

• Upfront disclosure. Show prices, fees, contract length and contact details. The NN/g study found users disliked sites that hid rates and asked them to make contact first.
• Specific testimonials. A named customer describing a concrete result is stronger than “Great service!”.
• Independent proof. Links to third-party reviews, recognised accreditations, or press coverage. NN/g notes people increasingly trust external sources over company-sponsored content.
• Clear detail. What is included, how it works, what happens after they click.

Proof must be real. Since 6 April 2025, fake reviews have been a banned practice under the UK’s Digital Markets, Competition and Consumers Act. The CMA’s short guide for businesses says you must not publish fake reviews, hide that a review was incentivised, or publish misleading review information such as ratings based on fake reviews. Businesses that publish reviews must also take steps to prevent and remove banned content.

One call to action

A landing page should ask for one thing. Every extra link, menu or competing offer gives visitors another way to leave without doing it. Remove the main site navigation if you can, or keep it minimal.

• Use a button label that says what happens: “Book a free 20-minute call”, not “Submit”.
• Repeat the same call to action further down the page for people who need to read first, rather than adding different ones.
• Keep any form short. Ask only for what you need at this stage.
• Say what happens next, for example “We’ll email you within one working day”.

A secondary action, such as “See pricing”, is acceptable if it helps people reach the main one, but it should look clearly less important.

Urgency: only if it’s true

Countdown timers and “only 3 left” messages are popular because they push people to act. In the UK they can also break the law. The CMA’s unfair commercial practices guidance lists falsely stating that a product will only be available for a limited time as a banned practice, and gives the example of a countdown timer that restarts when it runs out while the offer continues. It also describes a “Be quick! We’ve sold 10 in the last 5 mins” pop-up as misleading where stock is high. A genuine deadline, honestly stated, is unlikely to be a problem.

A worked example

An example (illustration only). A freelance web designer runs search ads offering a “website health check”. The current landing page is her home page: a headline reading “Creative digital solutions”, a full menu, a portfolio carousel, a blog feed and a contact form with eight fields.

She builds a dedicated page instead. The headline reads “Free website health check for small businesses” with a line underneath: “I’ll review speed, mobile layout and contact forms, and send you a written report within five working days.” The button says “Request my free check”. Below are three short sections: what the report covers, a sample page from a real report, and two named client testimonials linked to their websites. The form asks for name, email and website address. The menu is removed. There is no timer, because there is no deadline.

How to test without fooling yourself

• Change one thing at a time where you can, such as the headline, so you know what made the difference.
• Wait for enough data. Small sites rarely get the traffic for a reliable A/B test in a short period. Calling a winner after a few dozen visits often reflects chance.
• Watch people use it. A handful of usability sessions will show whether visitors understand the offer, which numbers alone can’t tell you.
• Measure the right outcome. More form fills of poor quality may be worse than fewer good ones.

Common mistakes

• Sending paid traffic to the home page.
• Clever headlines that don’t say what the offer is.
• Several competing calls to action of equal weight.
• Hiding price or commitment until after sign-up.
• Anonymous or invented testimonials.
• Fake urgency, such as resetting timers or made-up stock levels.
• Copying another company’s reported conversion rate as your target.

A dedicated landing page is worth building when you’re paying for traffic or running a campaign with one clear offer. For visitors who are still exploring what you do, a well-structured home page or service page usually serves them better.