Checkout optimization best practices: 9 design changes that actually move the needle

The average ecommerce checkout loses over half its shoppers before they finish paying. Baymard Institute found that better checkout design alone can lift conversions by 35%. And yet 65% of the top ecommerce sites still score “mediocre or worse” at checkout.

That means most stores are leaving money on the checkout page. These nine checkout optimization best practices are the specific design changes with the biggest measured impact. Not vague advice. Specific tactics you can test this week.

If you want the bigger picture (audit frameworks, checkout types, platform comparisons), our checkout optimization framework covers that. This post is the tactical companion. It’s about what to change on your checkout page and how to measure whether it worked.

For a full store-wide approach, start with the ecommerce CRO checklist. For what makes a good product page before checkout even begins, we have a dedicated guide. Or if you want a structured audit process, our ecommerce conversion checklist covers every page type from homepage to post-purchase.

1. Show all costs before the checkout page

Surprise fees are the number one checkout killer. Baymard’s meta-analysis of 50 studies puts the number at 48%. Nearly half of shoppers abandon because of unexpected shipping, taxes, or handling fees. A separate Statista survey confirms the same pattern every year.

The fix is simple. Show the total cost before people reach the checkout page.

What to do:

• Add a shipping calculator to your cart page. Let people enter their ZIP code and see their exact shipping cost before they click “checkout.”
• Show estimated tax based on the shopper’s location. Most ecommerce platforms can do this automatically.
• Use a free shipping progress bar: “Add $12 more for free shipping.” 80% of American shoppers expect free shipping above a certain order value. Show them how close they are.

This is checkout page optimization at its most basic. No redesign needed. Just move the pricing information earlier.

Our take: If your checkout page is the first time a shopper sees their total, you’ve already lost them. The price reveal should happen on the cart page, not the payment page.

2. Default to guest checkout

Baymard’s research across 500+ retailers shows that 26% of shoppers abandon checkout when forced to create an account. And 62% of ecommerce sites still don’t make guest checkout prominent enough.

There’s a famous case study that nails this. A $25 billion retailer replaced their “Register” button with “Continue” at checkout. UX researcher Jared Spool documented the result: 45% more completed purchases. $15 million in extra revenue the first month. $300 million more per year.

The kicker? When they investigated, they found 45% of customers already had multiple accounts they’d forgotten about. The site was getting 160,000 password reset requests per day. And 75% of people who tried to log in never finished buying.

Account creation was literally blocking the people it was supposed to help.

The better approach for checkout flow optimization:

• Make guest checkout the default, most visible option
• Offer account creation on the order confirmation page after they’ve already bought
• Post-purchase account creation converts at 30-50% because the person is already happy

Shopify’s own data backs this up. Shop Pay increases checkout conversion by up to 50% compared to guest checkout. Even just having the Shop Pay button visible (not clicked) increases conversion by 5%. People see a familiar payment method and feel safer.

If you’re working on your Shopify conversion rate, enabling Shop Pay is probably the single fastest win.

3. Cut your form fields to 7 or fewer

Baymard’s checkout benchmarks show the average checkout has 11.3 form fields. Their research says you need 8. Some go lower. Every field you remove is one less reason for someone to quit.

Fields you can probably cut:

• Company name (unless you sell B2B)
• Phone number (unless your shipping carrier requires it)
• Second address line (make it optional, collapsed by default)
• Separate billing address (default to “same as shipping” with a checkbox)

Then speed up the fields you keep. Google’s Chrome team analyzed millions of page loads and found that browser autofill makes a real difference. Shoppers who used it abandoned forms 75% less often and had 45% higher checkout conversion.

Address autocomplete helps too. Google’s research shows it cuts typing by 30% and errors by 20%. Real example: Universal Yums tested address autocomplete across 33,000 customers and saw a 1.5% conversion lift. Sounds small. For a $1 million store, that’s $15,000 a year from one change.

One more thing about checkout page design. How you validate form entries matters as much as how many fields you have. Luke Wroblewski (Product Director at Google) ran usability research on validating fields as people type (called inline validation). The result: 22% more completed forms and 42% faster checkout. Don’t wait until they hit submit to tell them something’s wrong.

4. Put express checkout buttons above the fold

Most stores add Apple Pay, Google Pay, or Shop Pay buttons somewhere in their checkout. Good. But WHERE you put them matters more than which buttons you offer.

Data from a 14-client study showed that express checkout buttons above the fold (visible without scrolling) convert at double the rate of buttons placed lower on the page. Those stores saw a 26% mobile conversion increase within 30 days of adding Apple Pay and Google Pay.

Stripe’s numbers are even bigger. Their analysis of $1.4 trillion in transactions found that adding one relevant payment method boosted revenue by 12% and conversion by 7.4%. Apple Pay alone drove a 22.3% conversion increase.

The psychology is straightforward. If a shopper sees a full form with 11 fields, their brain registers friction. If they see an Apple Pay button first, they think “oh, I can skip all that.” The ecommerce checkout page design matters. Lead with the shortcut.

Where to put express checkout buttons:

• Top of the checkout page (before the form)
• On the cart page
• On individual product pages (for impulse buys)

This is one area where product page optimization and checkout overlap. Adding express checkout to product pages lets people skip the cart entirely.

Our take: Every competitor article says “offer Apple Pay.” None of them tell you where to put the button. Above the form, not below it. That’s the whole tip.

5. Add buy now, pay later options

Buy now, pay later (BNPL) lets shoppers split a purchase into installments, usually interest-free. Think Afterpay, Klarna, Affirm, or Shop Pay Installments.

Stripe ran an A/B test across 150,000+ checkout sessions and found that BNPL increased revenue by up to 14%. Two-thirds of that volume came from net-new sales. People who wouldn’t have bought at all without the option.

It works across price points too. You’d think BNPL only matters for big-ticket items. Stripe’s data says otherwise. A $40 purchase benefits just as much as a $400 one.

86.5 million Americans used BNPL in 2024. PayPal’s consumer research found that 58% of Gen Z and 64% of Millennials prefer it when available. That’s not a niche audience. That’s most of your younger customers.

This is checkout conversion optimization that practically runs itself.

Which BNPL to pick: If you’re on Shopify, start with Shop Pay Installments (it’s built in). For other platforms, Afterpay and Klarna have the widest brand recognition. Don’t overthink the choice. Having any BNPL option is the big win.

6. Design your mobile checkout separately

Mobile accounts for over 75% of ecommerce traffic. But mobile conversion sits at just 1.53% compared to 2.9% on desktop. Most stores treat this like a screen-size problem. It’s not.

Behavioral research shows mobile shoppers deal with 1.8x more mental effort than desktop users during checkout. They’re distracted, they’re multitasking, and their thumbs are doing the work their mouse used to do.

In practice, that looks like this:

• Mobile form entry has a 25% error rate on touchscreens. Each error adds 45 seconds and raises the chance of abandonment by 18%.
• Touch keyboards eat 50% of the screen in portrait mode. Your form fields need to be big enough to tap accurately (48px minimum).
• Google’s performance data shows that every 100ms improvement in page responsiveness (what developers call INP) correlates with a 6.4% improvement in checkout completion.

Mobile-specific ecommerce checkout optimization best practices:

• Show numeric keyboards for phone numbers, ZIP codes, and credit card fields
• Place your primary action button in the thumb zone (bottom-center of the screen)
• Use larger input fields than you would on desktop
• Auto-scroll to the next field after each entry
• Test your checkout on an actual phone. Not a browser simulator. An actual phone with an actual thumb.

This is one of the biggest gaps in ecommerce checkout conversion rate optimization. Most stores make their checkout “responsive” (meaning it reshapes to fit the screen) and call it done. Responsive is not optimized. A checkout that works on mobile needs its own design thinking.

If you’re looking at your overall ecommerce conversion optimization strategy, mobile checkout is where the biggest gains are hiding.

7. Show progress and reduce anxiety

When people don’t know how many steps are left, they assume the worst. A progress indicator (step 1 of 3, step 2 of 3) sets expectations and keeps people moving forward.

Progress bars are just the start, though. The real issue is anxiety. Your shopper is about to hand over their credit card number. Any uncertainty at that moment, and they’re gone.

Three anxiety-reducing checkout design changes:

• Show the exact delivery date, not “3-5 business days.” Say “Arrives by Thursday, June 18.” 85% of European shoppers say poor delivery information prevents them from ordering again.
• Keep the order summary visible at every step. People want to double-check what they’re buying as they enter payment details.
• Validate form fields in real time. As we covered in section 3, inline validation (checking each field as the shopper types) lifts completion rates by 22%. Show green checkmarks as they go. It feels like progress.

This is part of the broader conversion funnel optimization picture. Checkout is the last stage of your funnel. If you’ve done everything right on the product page and cart, don’t lose people with a confusing checkout.

8. Build trust at the payment step

Baymard found that 19% of checkout abandonments come from security concerns. People worry about typing their credit card number on a site they’ve never heard of. If you’re not Amazon, you have to earn that trust visually.

Trust signals that work for Shopify checkout conversion rate optimization and beyond:

• Payment method logos (Visa, Mastercard, Amex, PayPal) near the card input field
• An SSL padlock icon next to the payment form (that little lock icon in the browser bar, which tells people the connection between their computer and your store is encrypted)
• A one-line return policy summary right on the checkout page, not buried in the footer
• Customer ratings or review counts pulled from the product they’re buying

Placement matters. Trust badges in the footer are almost invisible. Put them next to the credit card field where the anxiety actually happens.

If you’re on Shopify, a lot of this comes built in. Shopify’s checkout already shows familiar branding that builds trust. For stores on custom platforms, you need to add these elements manually. Our guide on checkout optimization for Magento and WooCommerce covers the platform-specific steps for adding trust signals and streamlining checkout on those platforms.

For more social proof examples that work at checkout, we’ve got a separate guide. And if you’re building a full CRO audit, trust at checkout should be one of the first things you check.

9. Test every change instead of copying a checklist

Every other checkout article gives you 10-15 tips and tells you to implement them all. That’s risky. (Yes, including this one. Don’t do all nine at once.)

Peep Laja, founder of CXL, shared some uncomfortable numbers in an interview on eCommerce Fuel. Roughly 50% of checkout redesigns actually hurt conversions. In 60-70% of tests, there’s no measurable difference. And about 20% of redesigns make things actively worse.

Research from BTNG.studio backs this up: opinion-based ecommerce optimization fails 80% of the time.

Why? Because every store is different. Your customers are different. Your products, your price point, your brand trust level. A change that lifts conversion for a luxury fashion brand might tank it for a $20 subscription box.

Even something “obvious” like adding more payment methods has a limit. The Iyengar and Lepper jam study from Columbia showed that 24 choices produced 3% conversion. Six choices? 30%. More options aren’t always better. Peep Laja says diminishing returns kick in beyond 4 payment methods.

How to test checkout changes the right way:

1. Pick the highest-impact change from this list (cost transparency and guest checkout usually win)
2. Run a split test with your current checkout vs the changed version
3. Let it run for at least 2 weeks to capture different buying patterns
4. Only change one thing at a time so you know what moved the number

Tools like Kirro let you split-test checkout page elements without writing code. Set up a test in about three minutes, point half your traffic at the new version, and let the data decide.

That’s the difference between guessing and knowing. Use the Baymard data to decide what to test first. Use your own data to decide what actually works.

For more on building a testing practice, check out our guides on A/B testing for UX and CRO best practices. Or browse the best CRO tools for ecommerce to find the right tool for your budget.

What is a good checkout conversion rate?

The checkout conversion rate is the percentage of people who start the checkout process and actually finish buying. It’s different from your overall conversion rate (which counts everyone who visits your site).

How to calculate it:

(Completed purchases / Checkout sessions) x 100

If 1,000 people start checkout and 550 buy, your checkout conversion rate is 55%.

Benchmarks by device (Statista 2024):

Metric	Desktop	Mobile
Overall conversion rate	2.9%	1.53%
Cart abandonment rate	~66%	~80%
Checkout completion (typical)	50-70%	35-55%
Top performers	4%+	5%+

These are site-wide conversion rates. Your checkout-specific rate (people who started checkout and finished) should be much higher, in the 40-65% range. If yours is below 40%, there’s a friction point worth finding.

Baymard’s meta-analysis of 50 studies puts the average cart abandonment rate at 70.22%. But remember, a big chunk of that (around 42%) is people who were just browsing and never intended to buy. The addressable abandonment (people you can actually win back with better checkout design) is closer to 30-40%.

If you’re tracking this in Google Analytics, our guide on ecommerce conversion rates in Google Analytics walks through exactly where to find these numbers.

Want to see if your checkout is underperforming? Run a quick A/B test with Kirro on any of the nine best practices above. Start with whichever one you haven’t done yet. The data will tell you where the money is.

FAQ

How do I optimize my checkout page?

Start with the three highest-impact changes: show all costs before checkout (48% of abandonments are from surprise fees), enable guest checkout as the default (26% leave when forced to register), and cut form fields to 7-8 maximum. Test each change individually rather than redesigning everything at once, because about half of full checkout redesigns actually hurt conversion.

Single-page vs multi-step checkout: which converts better?

Neither format has a universal advantage. What matters more is the total number of form fields and how well the form is designed. A bloated single-page checkout can perform worse than a clean multi-step flow. For a deeper comparison of checkout types and when to use each, see our checkout optimization guide.

How do you reduce checkout abandonment?

Address the top causes in order: remove surprise costs by showing totals earlier (48% of abandonments), offer guest checkout (26%), simplify forms to 7-8 fields (22%), add express payment options like Apple Pay above the fold, and build trust with security signals near the payment form. Each of these nine best practices targets a specific cause of checkout abandonment.

Does offering more payment methods increase conversion?

Yes, up to a point. Stripe’s study of $1.4 trillion in transactions found that adding one relevant payment method increases revenue by 12%. But behavioral research shows diminishing returns beyond about 4-5 options. Too many choices can cause decision paralysis. Start with credit cards, one digital wallet (Apple Pay or Google Pay), and one BNPL option like Afterpay or Klarna.

What’s the average checkout conversion rate?

The global average cart abandonment rate is 70.22%, meaning roughly 30% of shopping carts result in a purchase. But checkout-specific conversion (people who actually start checking out) runs between 40-65% for most stores. On mobile, overall ecommerce conversion rates average 1.53% vs 2.9% on desktop. If your checkout conversion is below 40%, focus on the nine best practices above to identify friction points.