Checkout UX: Removing Friction Without Losing Trust

How to remove checkout friction without losing trust: guest checkout, visible costs, only the fields you need, and technical errors that make people abandon.

info Quick Definition
Checkout is the final stretch of a purchase, where the user gives personal and payment data. Designing it well means removing unnecessary friction without removing the sense of control and security that makes paying possible.

What is checkout, and why does it hurt so much?

Checkout concentrates the most tension in a commerce product. The user has already decided to buy, but still has doubts about the final price, whether their data is safe, and whether the order will arrive. Every extra field, every unexpected cost, and every technical error can change their mind.

There are two forces to balance. Shopify notes that friction in checkout can affect conversion, and that customers should understand why they are asked for personal information. Removing one without caring for the other does not work: a very fast checkout that hides the final cost creates distrust, and one that asks for too many steps creates abandonment.

Why does this matter for a junior designer?

Because checkout is one of the few places where a design change has a direct, measurable effect on revenue. One unnecessary field or a screen that does not explain a cost can cost more than any visual redesign. In addition, in checkout, design mistakes are paid for with the customer’s money, which calls for more care than any other screen.

How do you remove friction without losing trust?

  1. Allow guest checkout. NN/g notes that forcing registration loses sales, and that stores adding a guest option often see more orders. NN/g advises making it the most salient of the checkout options.
  2. Show the order summary early. NN/g recommends showing it prominently at the top of the checkout pages, because on mobile, costs placed low on the page are easy to overlook.
  3. Ask only for what the purchase needs. Baymard indicates an ideal flow can be reduced to about 12 form elements, and that the average US flow shows 23.48 by default. NN/g advises removing questions that are nonessential, nonurgent, or irrelevant. Show optional fields only when they are needed, and label them clearly.
  4. Explain why you ask for sensitive data. Shopify recommends that customers understand why personal information is requested and what happens when they submit it. Its example is a birth date for buying alcohol.
  5. Postpone what is not urgent. In its EAS framework, NN/g suggests checking out as a guest and creating the password on the confirmation page, when the user already has what they wanted.

For validating these fields, the article on form validation timing explains when to show an error.

How is trust lost at checkout?

Baymard identifies several causes of cart abandonment that are not just friction. Among them are fear of fraud, when the store does not feel safe and trustworthy, and extra costs for shipping, taxes, or fees that appear late.

The same source lists other causes: a complicated checkout, which triggers buyer’s remorse quickly, and doubt about fit when the user cannot try an item on. Each calls for a different response: simplify the flow, give clear size and returns information, or show real signs of security.

Technical errors are even more direct. In a 2011 Baymard test with technical problems, 8 of 9 participants abandoned their cart immediately. A checkout that loses card details or returns a generic error does not have a visual design problem: it has a trust problem.

To design those states, the article on destructive action safeguards helps you think about what information must be kept and what confirmation is needed.

When should you NOT remove friction?

  • When registration is needed for real reasons. A subscription or an order history needs an account. There, explain the benefit rather than removing the step.
  • In flows that are not payments. A contact form or a lead sign-up is not a checkout, and applying the same rules may remove information that is needed.
  • When the friction is a protection. A confirmation before a large payment or an address change may look like friction, but it prevents costly errors. The boundary is set by dark patterns: friction should protect the user, not trap them.

Example

Illustrative example: a clothing store has a four-step checkout. Sixty percent of users who reach the payment step never finish.

  • Change 1: the account step becomes a guest checkout option, with sign-in as a secondary alternative.
  • Change 2: the total with shipping and taxes appears on the first screen.
  • Change 3: address fields are reduced to what is needed, and the postal code is validated when the user leaves the field.
  • Change 4: if payment fails due to a server error, the cart is kept and the message explains what to do.

The figures in this store are illustrative, not real data. What matters is that each change responds to a known cause of abandonment, and that each is measured separately.

Common mistakes

  • Forcing registration before showing the final price.
  • Showing extra costs only at the end of checkout.
  • Asking for data the purchase does not need, such as a physical address for a digital product.
  • Asking for sensitive data without explaining what it is for.
  • Losing the cart when payment fails.
  • Using a long dropdown for the state on mobile; NN/g recommends an open field, because typing the abbreviation is faster.

Sources

Frequently asked questions

What is checkout in UX?
It is the final stretch of a purchase, where the user gives personal and payment data. It is where friction and trust weigh the most on the decision to buy.
Should you force users to create an account to buy?
No, according to Nielsen Norman Group. Forcing registration loses sales, and stores that add guest checkout often see more orders. If an account gives something real, such as order history, explain it rather than imposing it.
How many fields should a checkout have?
Baymard indicates an ideal flow can be reduced to about 12 form elements, while the average US flow shows 23.48 by default. Ask only for what the purchase needs.
What should appear early in the checkout?
Nielsen Norman Group recommends showing the order summary prominently at the top of the checkout pages, because on mobile, added costs placed low on the page are easy to miss. According to Baymard, costs that appear late are a cause of abandonment.
Why can a technical error make people abandon a purchase?
In a 2011 Baymard test, in 8 of 9 cases with technical problems, participants abandoned their cart immediately. Checkout needs clear error states and data that does not get lost.