Some websites have to present hundreds or thousands of items at once: online shops, streaming services, recipe libraries and gaming platforms. Online gaming sites make a useful case study, because they show a very large catalogue to visitors who want to start within seconds, mostly on a phone. The same design principles apply to any UK business with a big product range or content library.

Design for the visitor’s first ten seconds

Visitors decide very quickly whether a page is worth their time. Put the actions people use most at the top of the page: search, the main categories and a short row of featured or recent items.

Avoid large autoplaying sliders on the home page. They push useful content below the fold, slow the page down and are often ignored. A single static introduction block with one clear call to action usually performs better.

Make a large catalogue easy to browse

• Use a consistent card grid. Give every item the same image ratio, a clear title and one key detail, such as a price, a category or a “new” label.
• Offer filters that match how people think. Price, size, category and “newest” beat internal jargon. Show how many results each filter returns, and keep the selection when the visitor presses Back.
• Make search forgiving. Suggestions as people type and tolerance for typos stop visitors hitting a dead end.
• Choose pagination or “load more” over endless scrolling when people need to return to their place or reach the footer for contact details.
• Add “recently viewed” and favourites, so returning visitors can pick up where they left off.

Design for the phone first

On catalogue-heavy sites, most visits now come from mobiles. Keep the main navigation within reach of the thumb, use a sticky bottom bar for the one or two key actions, and never hide important information behind hover effects that do not exist on touch screens.

Make tap targets comfortably large. The WCAG 2.2 accessibility guidelines set a minimum target size of 24 by 24 CSS pixels; around 44 pixels is more comfortable for most people.

Use colour with a purpose

Dark backgrounds are common on gaming, film and music sites because colourful artwork and thumbnails stand out against them. They can work for other catalogues too, but only if text stays readable. WCAG asks for a contrast ratio of at least 4.5:1 for normal body text.

Pick one accent colour for primary actions, such as “Add to basket” or “Start”, and use it consistently. Never rely on colour alone to show meaning; add a label or an icon as well.

Keep forms and checkout short

• Ask only for the information you genuinely need at that step.
• Use the correct input types and autocomplete attributes, so phones offer the right keyboard and saved details.
• Validate fields as people type, and explain errors in plain words next to the field.
• Show the total cost, delivery charges and any fees before the final step.
• Offer the payment methods UK customers expect: cards, Apple Pay, Google Pay and often PayPal.
• In regulated sectors, such as gambling, financial services or age-restricted products, identity and age checks are legal requirements. Explain why they are needed instead of hiding them.

Treat speed as part of the design

A beautiful catalogue that loads slowly loses visitors before they see it. Google’s Core Web Vitals give useful targets: the largest element should load within 2.5 seconds, the page should respond to taps within 200 milliseconds and the layout should not jump around as it loads.

• Serve images in modern formats such as WebP or AVIF, at the size they are displayed.
• Lazy-load images further down the page.
• Set width and height on images, so the layout does not shift.
• Use a content delivery network (CDN) for images and static files.

Good hosting matters as much as good design here. Our guide to choosing hosting for high-traffic websites covers what to look for.

Build trust into the layout

Visitors look for signs that a business is real before they hand over money or personal details. Make contact details, company information, delivery and returns policies and a privacy policy easy to find from every page. Keep promotional wording honest and put the key terms next to the offer, not hidden in small print.

Regulated industries show how seriously this is taken. UK gambling operators, for example, must give players clear terms and easy access to safer-gambling tools. Trust and compliance are design tasks, not afterthoughts.

A quick checklist before launch

• Can a first-time visitor find search and the main categories within a few seconds?
• Do filters and Back behave as people expect on a phone?
• Does all text meet contrast guidelines, including on dark backgrounds?
• Is the checkout or sign-up form as short as it can be?
• Does the site pass Core Web Vitals on a mid-range phone?
• Are contact details, policies and terms easy to find?

Choosing the right people to build a site like this matters just as much as the design itself. See what to look for in web design services before you brief an agency.