UX/UI impact on conversion
How design and user experience influence conversions on your site.
Your site may look beautiful, but is it effective?
The difference between a site people like and a site that actually converts often comes down to UX (user experience) and UI (user interface). Seemingly small details can have a huge impact on your results.
UX and UI: two complementary concepts
UX: the user journey
User experience (UX) covers everything a visitor feels while browsing your site:
- How easy it is to find information
- How smooth the journey feels
- Overall satisfaction
- How efficient it is to achieve their goal
Good UX is when users do not have to think about the interface: everything feels natural and intuitive.
UI: the visual interface
User interface (UI) is about visual design and interactive elements:
- Colours and typography
- Buttons and interactive components
- Layout and visual hierarchy
- Micro‑interactions and animations
A good UI guides the eye and nudges people toward action.
Numbers that tell the story
Studies consistently show the business impact of UX/UI:
- 88% of users never return after a bad experience
- Around 70% of e‑commerce projects fail because of poor UX
- Every euro invested in UX can return 10 to 100 euros
- A mere 1‑second delay can reduce conversions by 7%
This is why I pay so much attention to UX/UI in my client projects.
UX principles that drive conversions
Clarity first
Within 5 seconds, users should understand:
- Who you are
- What you offer
- How to take action
On the home page of this site, the objective is obvious: “Freelance web developer” + a clear contact button.
Visual hierarchy
Guide the eye to what matters most:
- Size: important elements are larger
- Colour: calls to action stand out
- Whitespace: breathing room highlights key content
- Position: “hot zones” (top, centre) for crucial information
Principle of least effort
Every extra click means lost users. Reduce friction by:
- Keeping forms short – only ask for what you really need (see my article on accessible, high‑performing forms)
- Designing simple navigation – no more than three clicks to any key page
- Adding search if you have a lot of content
Social proof
Humans are social creatures. Show that others already trust you:
- Client testimonials
- Partner logos
- Number of completed projects
- Ratings and reviews
On my portfolio, each project tells a story and demonstrates my ability to deliver.
UX mistakes that kill conversions
Overloaded homepages
Too much information often means no information. I have seen homepages with 15 sections, pop‑ups, sliders, auto‑play videos… The result: users leave.
Fix: prioritise. What must the visitor absolutely see?
Invisible CTAs
If your primary button blends into the background, nobody will click it.
Fix: use contrast, size and strategic placement. The CTA should be impossible to miss.
Endless forms
Asking for first name, last name, email, phone, address, postcode, city, country, date of birth and more just to sign up for a newsletter?
Fix: an email address is enough. Collect the rest later if needed.
Ignoring mobile
More than 60% of traffic now comes from smartphones. A site that is not mobile‑friendly ignores most of its audience.
Fix: use responsive design and think mobile‑first.
Neglecting performance
A slow site is a bad experience, full stop. Users will not wait.
Fix: optimise your Core Web Vitals and images.
Accessibility: UX for everyone
An accessible site offers better UX for everyone.
Good web accessibility practices benefit all users:
- Sufficient contrast → better readability, even in bright light
- Keyboard navigation → also useful for power users
- Alt text → context when images fail to load
- Clear structure → easier content comprehension
My work with the MAHVU association convinced me that accessibility is not a luxury – it is a necessity.
How to improve the UX of your existing site
1. Analyse your data
Before changing anything, understand current behaviour:
- Google Analytics: user journeys, exit pages, bounce rates
- Hotjar / Clarity: session recordings, heatmaps
- Google Search Console: queries that bring traffic
2. Test with real users
Ask five people to complete a task on your site (buy a product, contact you, find specific information).
Observe without helping. The main problems will become obvious.
3. Prioritise quick wins
Some improvements are simple and highly impactful:
- Improve CTA contrast
- Reduce the number of fields in a form
- Add a search bar
- Clarify the navigation
4. Iterate
UX is never “done”. Test, measure, improve, repeat.
Design at the service of the business
Good design is not just about aesthetics; it is a business tool.
The web design trends for 2025 I apply always serve a clear objective: conversion.
On every project, I think in terms of outcomes:
- Landing pages with optimised journeys
- Forms that do not scare users away
- Hierarchy that leads to action
- Performance that does not frustrate
Conclusion
UX/UI is not cosmetic. It is the core of your site’s effectiveness.
A beautiful but unusable site has little value. A modest‑looking but fluid site will convert better (even though the ideal is to have both).
If you feel your site could convert more, I offer audits and redesigns focused on conversion.
You can explore my portfolio to see concrete examples of UX/UI designed for performance.