E-commerce teams spend enormous amounts of time and money driving traffic to their product pages. Paid search, content marketing, social campaigns, influencer partnerships, SEO. The funnel looks great until the moment a customer clicks "Buy Now" and hits the checkout form. From that point, industry data shows that most of those hard-won visitors disappear before completing their purchase. The Baymard Institute tracks checkout abandonment rates across thousands of e-commerce sites, and the average hovers around 70 percent. That is not a typo. Seven out of ten people who add items to their cart never finish buying.
The uncomfortable truth is that most of this abandonment is preventable. It is not caused by comparison shopping or impulse regret. It is caused by checkout form design that introduces friction where none needs to exist. Understanding the specific causes, and fixing them, is one of the highest-leverage things any e-commerce team can do for revenue.
The Real Reasons People Abandon Checkout
Survey research across multiple studies has identified consistent reasons customers abandon checkout. Some are genuinely outside your control. The majority are not.
Unexpected costs at checkout. Shipping fees, taxes, or additional charges that appear only after the customer has invested time in the checkout process create a sense of bait-and-switch that frequently leads to abandonment. The fix is not hiding these costs elsewhere. It is showing them earlier, on the product page or in the cart, so the customer's expectation matches what they see at checkout.
Forced account creation. Many e-commerce platforms default to requiring account creation before checkout. Every additional step in the checkout flow reduces completion rates, and account creation is one of the costliest additional steps. Guest checkout should be the default option, with account creation offered as a benefit ("Save your information for faster checkout next time") rather than a requirement.
Slow page loads. A checkout flow that feels slow creates anxiety that the payment did not go through. Users click the submit button again, end up with duplicate orders or errors, and abandon the process entirely. Google's research on page speed shows that every second of load delay on mobile reduces conversion rates by around 20 percent.
Concerns about security and trust. Entering credit card information requires trust. Sites that look outdated, lack visible security indicators, or ask for information that seems unnecessary trigger legitimate concern. Trust signals like security badges, visible customer reviews, and clear return policies reduce this hesitation measurably.
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The Specific Form Problems That Kill Conversion
Beyond these macro issues, specific form design choices compound into conversion loss. Each of these issues is independently fixable.
Too Many Fields
A standard checkout form asks for billing address, shipping address, payment method, and contact information. That is already a lot. Every additional field you ask for (phone number, company name, how did you hear about us, birthday) reduces completion rates. Review your checkout form honestly: is each field essential for completing the transaction, or is it there because a marketing team wanted the data?
If a field is not required to fulfill the order, remove it from checkout. Collect it later through an optional post-purchase survey or a profile completion flow. The checkout form should be focused entirely on completing the purchase.
Poor Address Form Design
Address fields are where international customers often give up. A form that demands a US-style state dropdown, a 5-digit zip code, and a specific phone format confuses every customer outside the United States. Smart address forms use a single country dropdown that dynamically adjusts the rest of the address fields to match that country's conventions.
Address autocomplete from services like Google Places API or Loqate reduces the typing required and reduces errors in address entry. Users start typing their street address and the system suggests complete, validated addresses. Implementation takes a few hours and can significantly improve checkout completion.
Unclear Payment Field Labels
"CVV" means nothing to most customers. "The 3-digit code on the back of your card" makes sense immediately. Payment fields often use industry jargon that confuses users who are not processing payments every day. Replace jargon with plain language explanations, and include a small visual showing where to find each piece of information on a physical card.
Credit card number fields should format as the user types, breaking the number into groups of 4 digits automatically. The expiration date should use a date picker or dropdown rather than requiring specific text formatting. These micro-improvements reduce entry errors and make the form feel more professional.
Aggressive Validation
Validation that fires as the user types, highlighting their credit card number in red before they have finished typing it, creates anxiety. Wait until they move to the next field (on blur) before showing validation errors. If they leave a field incomplete and try to submit, then show validation errors. The principle is to help users succeed, not to catch them mid-error.
"Every checkout form I audit has 3 to 5 specific improvements that would measurably increase conversion. The fixes are small individually, but they compound into significant revenue differences over time. It is almost always worth the engineering effort to get them right." - Dennis Traina, 137Foundry
Mobile Checkout: A Special Case
Mobile checkout needs specific attention because the constraints are different from desktop. Thumb-sized tap targets, autofill behavior, keyboard types, and viewport scrolling all affect mobile conversion in ways that do not apply on desktop.
The mobile keyboard should match the field type. Email fields should trigger the email keyboard. Number fields should trigger the numeric keyboard. Phone number fields should trigger the phone keyboard. This is controlled by the HTML inputmode and type attributes, but many production forms use generic text inputs that force users to manually switch keyboards.
Autofill should work. The WebKit guide to autocomplete attributes covers the specific attributes that enable proper autofill behavior on iOS. A well-configured checkout form on mobile can let the user complete the entire billing address with a single tap on an autofill suggestion.
Apple Pay, Google Pay, and similar payment methods should be prominently offered on mobile because they eliminate most of the checkout form entirely. Users who have these configured can complete checkout in 2-3 taps instead of filling in every field manually. For many e-commerce sites, making these payment options more visible has a larger impact on mobile conversion than any form optimization.
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Testing Your Way to Better Conversion
The specific fixes that will improve your checkout conversion depend on your specific customers. Instead of guessing, instrument your checkout flow to see where users actually abandon.
Session replay tools like Hotjar or FullStory let you watch real customers attempt checkout. The patterns become obvious quickly. You will see specific fields where users hesitate, error messages that confuse them, or moments where they get distracted by non-checkout elements on the page. These observations are more valuable than any abstract best practices list because they show exactly where your specific customers get stuck.
Then A/B test your fixes. Changes that look like obvious improvements sometimes have unexpected effects. A field that seems redundant might actually be important for a segment of your customers. Run experiments, measure results, and ship the changes that measurably improve completion rates.
For a broader guide on form design principles that apply to checkout forms as well as signup forms, contact forms, and onboarding flows, this guide on designing web forms that users actually complete covers the full design framework. When you need help auditing your checkout flow and implementing improvements, 137Foundry works with e-commerce teams to identify the specific conversion killers in their funnels and build solutions that drive measurable revenue improvements.
The best e-commerce teams do not treat checkout as a solved problem. They continuously test, measure, and improve their forms because even small improvements compound into significant revenue over time. Every percentage point of conversion improvement on a checkout form that handles thousands of orders per month is real money that was previously leaking out of an otherwise well-built funnel.
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