Last month a CMO at a £30M skincare brand sat across from me and asked, with a straight face, whether her team should rebuild the PDP. I asked her to open her phone and walk through her own checkout. She stopped after the shipping page. The keyboard had covered the postcode field. She could not see what she was typing. She closed the tab, looked up, and said, “Right. Yes. I see.”
That is the conversation I keep having in 2026, and I want to write it down once so I can stop repeating myself.
Mobile checkout optimisation is the highest-leverage, lowest-glamour profit lever in DTC right now. Almost every brand I audit has a mobile conversion rate structurally below desktop, has not put a money figure on the gap, and is spending its product roadmap on things that move the number less.
Here is what I tell every founder who asks me about mobile.
1. Mobile checkout optimisation starts with a number, not a redesign
The first thing I do on any engagement is open Shopify analytics and pull two figures: device-split sessions and device-split conversion rate. On almost every brand I have looked at this year, 60 to 70 per cent of sessions are mobile, and the mobile conversion rate sits roughly a third below desktop. Some brands are at half.
I then do something almost nobody on the client side has done: I multiply the gap by their AOV and their mobile session count. That tells us, in pounds, what closing half the gap is worth per month.
Once a founder sees that number, the politics of the roadmap change in about ninety seconds. The PDP rebuild gets pushed. The mobile work gets fast-tracked. I have never had that conversation go the other way.
If you have not done that calculation this quarter, do it before you read the rest of this. It will reframe everything.
If you cannot say in pounds what your mobile gap is worth, you are not optimising. You are decorating.
2. The mobile gap is a UX problem, not a creative one
Founders love to believe their mobile gap is a creative problem. New imagery. Better video. Tighter copy. None of that is wrong, but none of it is the lever.
The lever is friction. Specifically, the kind of friction a desktop user never feels and therefore the founder never feels, because the founder buys their own product on a laptop at 11pm to test something.
Here is what I find on roughly every mobile audit:
- The cart page renders below the fold on a 6.1″ phone, so the user scrolls past upsells without ever seeing them.
- The shipping page asks for full name, address line 1, address line 2, city, county and postcode as six separate keyboard interactions. Each one is a chance to bounce.
- The express payment row (Shop Pay, Apple Pay, Google Pay, PayPal) sits below the email field instead of above it, so the user types an email before they realise they could have skipped the form entirely.
- The trust badges, the guarantee, the returns line are all on desktop and missing on mobile because the theme was built desktop-first three years ago.
None of that is a creative problem. All of it is build quality. And build quality is what gets cut when a brand is moving fast.
3. Speed is not a vanity metric on mobile
I am tired of being polite about this one. If your mobile Largest Contentful Paint is over three seconds on a mid-range Android on a 4G connection, you do not have a CRO problem. You have a physics problem.
A user on a train, on a phone with 12 apps open, on a network that just dropped a bar, will not wait for a hero image to decode. They will hit back. Shopify’s analytics will record that as a bounce. Your paid team will record it as a bad audience. Nobody will record it as what it actually was, which is a site that was too slow to load.
The fixes are unglamorous. Lazy-load everything below the fold. Compress hero assets to under 150KB. Remove the third-party scripts that were installed for a campaign two years ago and never removed. Audit the apps. On one £18M home goods brand we worked with, we removed nine apps that nobody on the team could justify, and mobile LCP dropped by almost a second. The mobile conversion rate moved with it.
Speed is the only optimisation that helps every single page on the site at once. Treat it like infrastructure, not like a project.
4. Cart-page mobile UX is where the money hides
Most founders think of “checkout” as the Shopify checkout itself. That is a mistake. The biggest mobile leaks I see are on the cart page, before the user ever clicks the checkout button.
The cart page on mobile is doing three jobs at once: confirming the order, presenting any upsell or threshold logic, and giving the user enough confidence to keep going. On most themes I audit it is doing one of those badly and two of those not at all.
What works on mobile carts, in my experience:
- A single, fixed-width primary CTA above the fold that says what currency the user is paying in.
- A free-shipping or gift threshold message with a progress bar, sized so it is legible without zooming.
- One trust line directly under the CTA. Returns policy or guarantee. Not three.
- Express payment buttons stacked, full-width, above the standard checkout button. Not hidden in a drawer.
If you want to see what a well-thought-through cart threshold can do to revenue, we wrote up the £25,535/month cart threshold test in detail. The cart page is the most under-loved page on a Shopify site and the one with the cleanest A/B testing surface.
5. The shipping page is a keyboard problem
This is the observation that nobody in the brand believes until they watch session recordings on a real phone.
On mobile, every input field is a keyboard event. Every keyboard event covers half the screen, hides the form, and forces the user to scroll within a scrolling page. The user’s thumb is doing work it should not be doing. The user’s patience is finite. Each input is a coin flip on whether you keep them.
The brands that win on mobile do three things on the shipping page:
- They use address auto-complete (Loqate, Google Places, or the native browser version) so the user types two characters and taps once instead of typing six lines.
- They surface express payment options above the form, so 30 to 50 per cent of users skip the form entirely.
- They suppress fields the user does not need on mobile. “Company name”, “address line 2” and county can almost always be hidden behind a tap.
None of this is hard. It is just unglamorous, which is why it is undone. If you want a structured way to find these on your own site, our Shopify CRO audit framework walks through every page in order, mobile-first.
6. Payment breadth is not optional anymore
I will keep this short because it is the easiest fix on this list.
If you are not offering Shop Pay, Apple Pay, Google Pay and PayPal as express options on mobile, you are pricing your conversion rate down for no good reason. The cost of installing them is one afternoon. The lift, on every brand I have personally seen, has been measurable within a week.
Klarna and Clearpay are a category decision, not a checkout decision. If your AOV is over £80 and your customer base skews younger, they are worth testing. If your AOV is £25 and your customer base is older, do not bother. The rule is: do not offer payment methods that confuse the customer about how much they are paying.
What I tell every founder who asks me about mobile
I tell them three things, in this order.
One. Open the site on your own phone, on 4G, with a fresh browser, and try to buy something. If anything about that experience embarrasses you, stop reading and fix it. You will be more productive in the next ninety minutes than your last team off-site was in a day.
Two. Put a money figure on your mobile gap before you commission another project. The number will discipline the roadmap.
Three. The mobile work is unglamorous and it compounds. Speed, cart-page UX, payment breadth and address auto-complete are not a quarter’s worth of strategy. They are a fortnight of focused build. The brands that do them quietly outperform the brands that do not, and almost nobody in the trade press writes about it because there is no story in “we removed three apps and our LCP improved”.
If you want a structured view of how mobile checkout fits into the broader profit picture, we covered the wider stack in our Shopify profit optimisation framework, and if you want our team to do the diagnosis for you, that is what our profit optimisation engagement is built for.
FAQs
What is mobile checkout optimisation?
Mobile checkout optimisation is the practice of removing friction from every step a customer takes on a phone, from the cart page through to order confirmation. It covers page speed, form design, payment options, trust signals and the small interaction details (like keyboard behaviour) that desktop users never encounter.
How much is a mobile conversion gap typically worth?
It depends on your traffic split and AOV. The calculation is straightforward: multiply your mobile sessions by the gap between your mobile and desktop conversion rates, then multiply that by AOV. For most brands I audit, closing half the gap is worth a meaningful five-figure sum per month.
Is page speed really part of mobile checkout optimisation?
Yes, and it is the part most brands underweight. If your Largest Contentful Paint on mobile is over three seconds on a mid-range Android, a chunk of your paid traffic is bouncing before they ever see your offer. Speed is a checkout problem before it is a hero-image problem.
Should I prioritise the cart page or the Shopify checkout itself?
The cart page, in most cases. The Shopify checkout is largely locked down (unless you are on Plus with Checkout Extensibility), but the cart page is a free testing surface where threshold logic, trust messaging and express payment placement can be iterated weekly.
Which payment methods are essential on mobile in 2026?
Shop Pay, Apple Pay, Google Pay and PayPal as express options are non-negotiable. Klarna or Clearpay are a category decision based on AOV and audience age. Do not add payment methods that obscure the total the customer is paying.
How long does a mobile checkout optimisation project usually take?
The unglamorous fixes (speed, address auto-complete, payment buttons, cart UX) typically take two to four weeks of focused build for a single brand. The compounding gains continue for months afterwards because every campaign, every email, every paid click benefits from the work.