E-commerce site not converting: 7 common causes (and how to fix them)

Campaigns are running, rankings are improving, visitors land on the product page and leave without buying. It's the most frustrating situation for a brand selling online: the traffic stats look fine, because the problem sits in the site itself. We see this often when we take over existing Shopify stores.

In most cases, the store was never built to convert the traffic it gets. Each cause shows up as a measurable symptom. Below are the 7 most common ones, in the order they weigh on conversion, with the signal to look for and the fix that follows.

A free or purchased theme was designed to suit thousands of different stores, so it fits none of them exactly. The sections are generic, the visual hierarchy doesn't put the product first, and the theme carries code for features never used on this particular store.

That dead code weighs down every page and dilutes the brand's identity. A visitor who recognizes a theme they've seen elsewhere sees nothing that sets the brand apart, and that difference is what makes someone buy over a cheaper competitor. We code each section for the specific catalog: the detail is in the comparison between a themed store and a custom one.

It's the most common cause we see when auditing existing stores, and the least often acknowledged by the agencies that built them. Every installed app (pop-up, upsell, reviews, page builder) loads its own script on every page, even when it isn't used on that particular page.

The symptom is measurable: a mobile LCP (the loading time of the page's main element) beyond 2.5 seconds, the threshold set by Google. The app bill, meanwhile, grows every month. The fix: build the recurring features directly into the code. The detail is in Shopify without paid apps and in diagnosing a slow Shopify store.

A visitor who doesn't know the brand decides within seconds whether to trust it. Without a distinct color palette, chosen typography, a recognizable tone, the store looks like an anonymous storefront among thousands of others. The product can be excellent: if the presentation says nothing, trust never builds.

The symptom shows up in the return-visitor stats: few visitors come back before buying, and the brand doesn't stand out at a glance. The fix happens before development starts. The service details are on /services/branding.

Every step between “add to cart” and “confirm order” is an exit door. A mandatory account, a lengthy form, no one-click payment: each one looks minor and costs orders all the same. The symptom shows up in the abandonment rate measured at checkout.

An efficient checkout flow fits in 2 to 3 steps, offers guest checkout, and includes Apple Pay and Google Pay. On a recycled theme, this flow can rarely be changed at depth. On custom-built code, each step gets reworked based on the friction observed in the store's traffic.

Most e-commerce traffic comes through mobile, and yet most sites are “responsive” only in the technical sense (the content adapts to the screen) without being designed for actual mobile use: buttons sized for a thumb, simplified forms, images framed so they never spill past the visible frame, whatever the screen size.

The symptom shows up in the by-device stats: a mobile conversion rate well below desktop, on the same store. This gap between “responsive” and “designed for mobile” explains most of that difference, and the fix happens at the design stage.

This one makes the five causes above last longer. When every text or section change requires contacting the agency again, urgent fixes (a message that doesn't reassure, a poorly worded product page) drag on for weeks. The symptom is measurable in the time between a request and it going live.

A store built for the team's independence lets you fix in hours what would otherwise take weeks of back and forth. That's why, at handover, the client's team is trained on the sections coded to be edited without a developer: text, photos, colors, whole blocks, without risking a broken layout.

Many stores that don't convert started from a vague quote, revised upward along the way, where trade-offs got made on speed, custom work or brand identity to stay within the initial budget. The symptom: a measurable gap between the quoted price and the final invoice.

A price fixed from the start, on a clear scope defined after a discovery call, avoids those silent trade-offs, which end up costing sales every month. For budget ranges, see the guide on Shopify site pricing.

In a Shopify redesign, we recode the store's pages around the brand: no pile-up of unnecessary apps, a brand identity defined before development starts, a checkout flow designed for mobile. One team and one point of contact follow the project from the first call to launch, for a price fixed after the discovery call, on a fixed timeline of 4 to 6 weeks.

At Bleu Mon Jules, the catalog and content were carried over without loss during the redesign (see). At Yade Paris, the store evolves every month in small batches (see). The team is trained to edit content, with a response within one business day for any bug. A store audit can be discussed via /contact.