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5 Most Common Mistakes That Hurt Online Sales — and How to Fix Them

You have a great product, strong reviews, and advertising campaigns that drive traffic, yet sales still refuse to grow.


Do not worry — this is a common situation. In many cases, the issue is not the offer itself, but what happens on the website.

At UseWeb, we regularly analyze online stores and we see the same pattern over and over again: simple technical and UX mistakes are responsible for a significant part of lost conversions.

Below, we present the five most common problems — and specific ways to solve them.

1. No Clear CTA — The Customer Does Not Know Where to Click

CTAs (Calls To Action) guide users through your website. When a page lacks clear buttons such as:

  • “Buy Now”
  • “Add to Cart”
  • “View Offer”
  • “Order Now”

…users simply lose direction. Too many elements and too few indications of what to do next result in lost sales.

How to Fix It

  • Use contrasting, visible buttons
  • Focus on one main CTA per section
  • Place CTA buttons above the fold, in the first visible screen

2. A Slow-Loading Website

Every moment of delay increases the chances that the visitor will leave your website. Search engines also evaluate loading speed when ranking pages.

The most common causes of slow performance include:

  • Large, uncompressed images
  • Too many plugins or scripts
  • Weak hosting
  • Lack of mobile optimization

How to Fix It

  • Compress images, ideally using formats such as WebP
  • Reduce the number of plugins
  • Use a Content Delivery Network (CDN)
  • Test your speed regularly using PageSpeed Insights

3. Chaotic UX — The Customer Cannot Find What They Need

A website can look visually appealing, but if users cannot complete simple actions, they will not buy.

Typical UX issues include:

  • Unintuitive navigation
  • Too much information displayed at once
  • Poorly organized product categories
  • Inconsistent design elements

How to Fix It

  • Simplify — focus on clarity over complexity
  • Present information in a natural, logical order
  • Maintain consistent design throughout the site
  • Use clear, readable headings

4. Hidden Cart and Complicated Checkout Process

The goal of your website is to guide the customer smoothly toward a purchase.
Unfortunately, many online stores make the process unnecessarily difficult.

Common checkout-related issues include:

  • Cart not visible on mobile
  • Too many steps in the purchasing process
  • Forced account creation
  • Confusing or unclear messages

How to Fix It

  • Make sure the cart is always visible, especially on mobile
  • Simplify checkout to the fewest steps possible
  • Allow customers to buy without creating an account
  • Use short, understandable language

5. No Mobile Version or a Poor Mobile Experience

It is common to see a store that looks great on a desktop – but completely falls apart on a phone.
With the majority of traffic coming from mobile devices, this is one of the most serious mistakes.

Frequent mobile issues include:

  • Misaligned elements
  • Buttons that are too small
  • Text that is difficult to read
  • Slow performance
  • Poor cart usability

How to Fix It

  • Use responsive design
  • Increase the size of buttons and text
  • Optimize layouts for thumbs and natural mobile gestures
  • Test your site on multiple devices and screen sizes

Conclusion

What hurts online sales is rarely related to the product itself.
In most cases, the website does not guide users in the right direction.

The good news is that every issue described above can be fixed — and improvements often bring visible results quickly.

If you want to know which of these problems appear on your website, we can help.
Contact us and we will prepare a free analysis with practical recommendations.

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FAQ's

How do I know which errors are occurring on my website?

We can conduct an audit covering UX, technical aspects, speed, and mobile experience. You’ll receive a specific list of areas for improvement.

Do I have to rebuild the entire website?

Not always. Often, just a few changes are enough to significantly improve conversions. A redesign is only necessary if a site is outdated or poorly designed.

How quickly can you see the effects?

Changes in CTA, speed, or mobility usually produce visible results in a short time.

Do you also help with advertising campaigns?
Yes. We combine website optimization with campaign optimization to ensure that ad-generated traffic translates into sales.
My website works fine on desktop but poorly on mobile. Does it really matter?
Yes. Most users use phones. A poor mobile version significantly reduces sales.