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10 Common UI/UX Website Design Mistakes to Avoid

Since 201565+ in-house teamKolkata office, 5 team bases

By , Full stack developer (back end and front end) with Benjamin SardarPublished 30 Oct 2025Updated 20 Aug 20265 min read

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In short.

Ads, blogs and SEO bring people to your site, but small design flaws send them away before they click, buy or sign up. PromotEdge checks a site on a phone first and measures where visitors drop off, so every fix is tied to enquiries.

Aesthetic design is trending, but user experience (UX) is not something to take lightly. With a reliable web design company helping you with strategizing, it can become a tool for conversion.

This article explores the common UI/UX mistakes and how to correct them before they cost you more traffic, trust and sales. But first take a look at:

The role of UI and UX in conversion

There is a common misconception about UI from UX being the same. User Interface (UI) is about the visual layout, including

  • Buttons,
  • Colors,
  • Fonts,
  • Spacing, and
  • Overall aesthetics.

User Experience (UX), on the other hand, is how easy it is to move through your site and complete tasks. The two are deeply linked, but they are not the same. Both are important to attract an audience. You can have a beautiful UI. But your conversion rate may drop if users can’t find what they’re looking for, or if the site is slow, confusing, or clunky.

10 UI/UX website design mistakes to look out for

Here is a list of top 10 UI/UX mistakes and how working with web designers in Kolkata can help you avoid them:

1: Unclear navigation

When a user visits a website, they don’t know where they can find the information they are looking for. According to one source, it takes about 2.66 seconds for users to scan the website. So, it is essential to create smooth, easy navigation. There are a few things that can make your visitor feel confused:

  • Site menus overloaded with options,
  • Poor labeling, or
  • Multiple dropdowns,

So, when planning the framework, ask your partnered web design company to use clear labels and organize content logically. The important pages, for example the home page, are easy to find within a few clicks. This helps users move through the site and find information faster.

2: A cluttered interface

Minimalist designs are trending in 2025. There is a reason behind it. A site cluttered with many visual elements looks busy. It can also make decisions harder for your audience. Brands try to gain attention through visuals. But too much makes it overwhelming.

Here are a few things to avoid:

  • Crowded layouts,
  • Overusing animations,
  • Conflicting design elements

That is why many brands prefer to work with a professional web design company. These professionals use whitespace and visual hierarchy, and place content strategically to draw attention.

3: Choosing looks over function

Trendy visuals and animations make a website look trendy on the outside. But what about functionality? Users are not visiting your website for timepass. They want actual information and buttons that work. If your website “add to cart button” doesn’t work, or users can scroll down through the products smoothly, it will hurt performance.

Brands should not design a website for themselves. It should be focused on their audience and their overall experience for conversion. Professional web designers in Kolkata help to create a website that is functional, purposeful and user-centered.

How do you make your audience take action? It is through call-to-action (CTA). These CTAs should be placed somewhere users can easily find them. But often brands place them where users can’t find them. So the users leave.

5: Slow loading

No one likes to wait for a site to load. Even a one-second delay can reduce conversions. Slow sites enrage users on mobile and drive up bounce rates overall.

Big pictures, code not optimized, and excessive scripts can all slow down performance. Each second counts in keeping interest. A responsive, fast site keeps users engaged and flowing through the conversion path.

6: Mobile unfriendliness

Mobile traffic often outpaces desktop in most sectors. So not optimizing for mobile is one of the most expensive UI/UX errors today. Phone or tablet users expect the same ease, clarity, and functionality as they would on a desktop. Brands should thoroughly check whether the mobile version of the website has

  • Awkward-to-tap buttons,
  • Tightly packed text, or
  • Misplaced images

These frustrated users and they end up ditching your site. Professional web designers in Kolkata make sure your website is responsive across multiple devices.

7: Lack of trust-building elements

Consider from a user perspective. Would you make a purchase from a site that you don’t trust? A website should have social proof to make themselves reliable, such as

  • Reviews,
  • Testimonials,
  • Actual address
  • Contact details

Some brands go an extra step and add security badges during checkout, indicating verified customer reviews, and making transparent policies. These features build trust and make users feel confident about their decision.

8: Forms that frustrate instead of convert

Adding forms to a website is important. Be it a sign-up, a contact form, or a purchase, they help you gain new leads. But your audience may lose interest if you use them too often or they are too long. The form should be to the point, without asking for unnecessary information.

For users to follow through easily, use

  • Clear labels,
  • Logical flow,
  • Autofill features, and
  • Mobile optimization

9: Disregarding user feedback

A website made from a designer’s perspective may not always be perfect. It needs feedback from real users, to improve where they are lacking. This can be done through surveys, abandoned sessions, or usability tests. That is why web design agencies often check user feedback. They run A/B tests and use heatmaps to identify what will work for them.

10: Accessibility issues

A website that is supposed to be accessible to all. It is more about social responsibility. Brands need to consider people with disabilities when designing the site.

There are several designing elements that helps brands to deliver an inclusive experience, such as

  • Alt text,
  • High-contrast color schemes,
  • Keyboard navigation, and
  • Readable fonts

Final word

Websites are critical for businesses to convert potential customers. And for that brands need to focus on user interface (UI) and user experience (UX). Collaborating with a skilled web design company like PromotEdge might be helpful here. We are experienced in custom UI /UX design and can help you find the areas that you need to work on.

Not sure which of these your site has? A UX audit finds the ones that cost you enquiries.

Starting from scratch? UX research shows what your buyers need first, and ecommerce website design plans the pages that decide a sale.

FAQs

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What clients told us after working with PromotEdge.

“PromotEdge and their team did an excellent job with our website. They engaged with every team member, understanding their needs with great patience before collating them into a user requirement and a design spec. …”
Bimal ShahBimal ShahExecutive Director at Fine Organic Industries LimitedManufacturing
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Medha SharmaMedha SharmaStrategic Head at TATA MetaliksSteel and metals
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Rajat ChatterjeeRajat ChatterjeeHead Business Development at Birdman Chemeng Pvt Ltd.Manufacturing
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Rahul MishraRahul MishraAssistant Manager Digital Marketing & Ecommerce at Magik LightingElectricals
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Shubham GadodiaShubham GadodiaDeputy Brand Manager at Shyam Metalics GroupSteel and metals
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Abhijit BhattacharyaAbhijit BhattacharyaFormer Captain Indian VolleyBall Team; and Founder of Brahmaputra Volleyball LeagueSports
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Harsh GuptaHarsh GuptaManaging Director at Rishta FoodsFMCG
“I would just like to congratulate, PromotEdge Led by Sayantan and his Team who have done an absolutely fantastic job of branding for the Kolkata Thunderbolts, the Branding, the social media campaign was bang on, and I think …”
Joy BhattacharjyaJoy BhattacharjyaCEO at Prime Volleyball LeagueSports
“I am delighted with the successful launch of our new website, thanks to the exceptional support from PromotEdge. …”
Mom MitraMom MitraMarketing Head at IleadEducation
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Priyanka GuptaPriyanka GuptaDirector at Nitya Gold & DiamondsJewellery retail
“PRAN & PromotEdge have been working together for last 1.5 years. Throughout, the work experience is good and satisfactory. As a client, we found PromotEdge very professional and dedicated towards any project assigned to them. …”
Sharif Rezwan KabirSharif Rezwan KabirBrand Manager at PRAN RFL GroupFMCG
“As a progressive and emerging digital marketing company, PromotEdge is doing something right to enhance the experience of companies associated with them. …”
Anish Basu MallikAnish Basu MallikMarketing Executive at Unimark GroupReal estate
“Hi, my name is Hitesh Malhotra. I'm working in FIVB. We are working with PromoteEdge (with Team Sayantan). I would like to give you a brief detail. …”
Hitesh MalhotraHitesh MalhotraSports Development at Fédération Internationale de Volleyball - FIVBSports
“Working with PromotEdge has been an enriching experience for ABP at many different levels. Your understanding of the digital space, customized brand solutions and prompt servicing have helped us achieve our brand goals with so much ease. …”
Satabdi SahuSatabdi SahuLead - Brand and Content at ABP EducationEducation
“The PromotEdge Agency stay with us all these 3 days, since when we arrived..more, more than 3 days. Since in the airport, they stayed together with us (FIVB team). …”
GibaGibaBrazilian Former Volleyball PlayerSports
“In the city of Kolkata , there are very few full service advertising agencies which are compact, agile, quick and yet have the vision and creative /executional abilities of large reputed agencies. …”
Hardeep SinghHardeep SinghMarketing ConsultantIndependent view
“It’s a great way to be back at PromotEdge. …”
Priyam GhosePriyam GhoseContent Creator
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Common questions.

  • UI (user interface) is how a website looks, such as buttons, colours, fonts and spacing. UX (user experience) is how easy it feels to move around the site and finish a task. A site can look beautiful and still lose sales if visitors cannot find things or the pages feel slow.

  • Nobody likes to wait for a page to load. Even a one second delay can reduce conversions. Slow sites annoy mobile users and push up bounce rates. Big pictures, unoptimised code and too many scripts are common causes. A fast site keeps visitors moving towards an enquiry or a purchase.

  • Too many visual elements make a site look busy and make decisions harder for visitors. Crowded layouts, heavy animations and clashing design elements overwhelm people. Whitespace, a clear visual hierarchy and well placed content draw attention to what matters, so visitors know where to click next.

  • Keep the form short and ask only for the information you really need. Use clear labels, a logical flow, autofill features and a layout that works well on mobile. Long forms, or forms shown too often, make people lose interest, so every extra field should earn its place.

  • Do not rely only on the designer's view. Real users show where they struggle. Use surveys, usability tests, abandoned sessions, heatmaps and A/B tests, which compare two versions of a page. Also check the mobile version for awkward buttons, tightly packed text and misplaced images.