UI Design Best Practices for Higher Conversion Rates

Case Study: How an Online Store Improved UI and Increased Conversions by 30 Percent

A well-designed User Interface (UI) is critical to converting visitors into customers. Small design improvements—such as optimizing colors, fonts, and buttons—can significantly impact how users interact with a website.

This article explores best practices for UI design that can boost conversion rates, including a case study of an online store that improved UI and increased conversions by 30 percent.

1. Choosing the Right Colors and Fonts for Better Engagement

The Psychology of Colors in UI Design

Different colors evoke different emotions and influence purchasing behavior.

• Red – Creates urgency and stimulates action (often used in “Buy Now” buttons).

• Blue – Builds trust and reliability (commonly used in finance and SaaS websites).

• Green – Represents growth and relaxation (popular in health and eco-friendly brands).

• Black and White – Signifies luxury and simplicity (often used in high-end fashion).

Example: Coca-Cola uses red to encourage excitement and urgency, while PayPal uses blue to create a sense of trust.

 Choosing the Right Font for Readability

• Sans-serif fonts (such as Arial, Roboto) improve readability on screens.

• Font size should be at least 16px for body text to reduce eye strain.

• Avoid decorative fonts for important text, as they reduce clarity.

Example: Apple’s website uses San Francisco, a clean and readable font that enhances user experience.

2. Optimizing Call-to-Action (CTA) Buttons

Why CTAs Matter in Conversion Optimization

A well-designed CTA button guides users toward taking action, such as purchasing, signing up, or subscribing.

Best Practices for High-Converting CTA Buttons

• Use contrasting colors – The button should stand out from the background.

• Keep CTA text short and action-driven – Use “Get Started” instead of “Click Here.”

• Position CTAs strategically – Place above the fold and at key decision points.

• Use rounded corners – Studies show rounded buttons are more clickable than square ones.

Example: Amazon’s "Add to Cart" button is large, yellow, and positioned in a high-visibility area, making it easy for users to take action.

3. Designing Forms That Encourage User Interaction

Why Form Design Impacts Conversions

Poorly designed forms cause frustration and lead to high drop-off rates. A well-optimized form makes it easy for users to complete their actions.

Best Practices for Form Design

• Keep forms short – Only ask for necessary information.

• Use inline validation – Show errors in real-time rather than after submission.

• Auto-fill fields where possible – Reduce user effort by pre-filling known information.

• Use clear field labels – Avoid placeholders as labels, as they disappear when typing.

Example: Airbnb’s booking form is short and simple, with auto-fill features and clear field labels, reducing friction for users.

4. Case Study: How an Online Store Increased Conversions by 30 Percent

The Problem

An e-commerce website had a low conversion rate due to:

• Poor color contrast for CTA buttons

• Overly long checkout forms

• Small, hard-to-read fonts

UI Improvements

• Changed CTA buttons to high-contrast orange for visibility

• Simplified checkout forms by removing unnecessary fields

• Increased font size for better readability

The Results

• Conversion rate increased by 30 percent

• Cart abandonment rate decreased by 20 percent

• User engagement improved by 25 percent

Conclusion:

A well-designed UI can significantly improve conversion rates by:

• Using the right colors and fonts to create an engaging experience.

• Optimizing CTA buttons to guide users toward key actions.

• Simplifying forms to reduce user friction and encourage completion.

By making small but strategic UI improvements, businesses can increase user engagement, lower bounce rates, and drive more conversions. If you want better results from your website, start by analyzing your UI and implementing these best practices.