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Shopify Checkout Optimization

Shopify checkout optimization for speed, pre-checkout UX, and payment options. Basic and Shopify plans: we maximize conversion within the locked checkout. Shopify Plus: full checkout customization. Average 33% lower cart abandonment.

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The Truth About Shopify

Can You Replace Shopify Checkout?

No. Shopify does not allow you to completely replace their checkout with a fully custom-built one.

Shopify owns the checkout. The old checkout.liquid (which previously allowed deep code-level customization for Plus merchants) has been deprecated and replaced with Checkout Extensibility, a modern, app-based framework for checkout customization. You cannot host your own checkout page, use a third-party checkout, or build one from scratch on Shopify.

We work within Shopify's framework to maximize conversion. On Basic and Shopify plans, we focus on pre-checkout optimization: cart page, speed, payment options, and trust signals. On Shopify Plus, we leverage Checkout Extensibility to build custom fields, branded experiences, and checkout UI extensions. Our clients typically see 33% lower cart abandonment and 25%+ conversion increases.

Plan Comparison

Shopify Basic vs Plus: What's Possible

Checkout flexibility varies by plan. We optimize within your plan's constraints.

Feature
Basic / Shopify
Shopify Plus Full customization
  • Checkout page
    Locked, no customization
    Checkout Extensibility, UI Extensions
  • Custom fields & upsells
    No
    Yes, via Checkout UI Extensions
  • Shopify Functions
    Via apps only
    Direct, custom logic
  • Checkout Branding API
    Limited
    Full control (fonts, colors, favicon)
  • B2B approval workflows
    Via apps
    Native, Script Editor
  • Our focus
    Pre-checkout: cart, speed, payments, trust
    Full checkout + pre-checkout
Why Shopify Locked Down Checkout

Why Shopify Controls the Checkout

Shopify's decision to control the checkout core was driven by security, reliability, and compatibility. We work within these constraints to deliver results.

Security

Custom code in the old system could break during updates and create vulnerabilities exposing customer data. Shopify's controlled checkout ensures PCI compliance and reduces risk.

Shop Pay compatibility

The legacy approach was incompatible with Shop Pay, Shopify's one-click payment solution that reportedly delivers a 91% higher conversion rate. Shopify decided that controlling the checkout core is non-negotiable.

Reliability

We work within these constraints. Our optimization strategy focuses on what you can control: pre-checkout pages, theme speed, payment options, and on Plus, Checkout Extensibility. Even with a locked checkout on Basic and Shopify plans, we typically reduce abandonment by 20-30%.
Checkout Extensibility

What You Can Customize on Shopify Plus

With Checkout Extensibility, Plus merchants get significant flexibility within Shopify's framework.

Checkout UI Extensions

On the frontend, we add custom fields, trust badges, in-checkout upsells, and more via Checkout UI Extensions. These extensions plug into defined checkout points and let you extend the experience without replacing it.

Shopify Functions

On the backend, Shopify Functions let you implement custom discounts, validation rules, dynamic shipping options, and payment logic. We build Functions for Plus stores and can help Basic/Shopify merchants access similar logic through apps.

Checkout Branding API

The Checkout Branding API gives granular control over fonts, colors, corner radii, and favicon. Plus stores can make checkout feel on-brand without touching core checkout code.

Post-Purchase Extensions

Extend the post-purchase experience with thank-you page customizations, order status updates, and upsell opportunities. Available on Plus via Checkout Extensibility. We build post-purchase flows that increase AOV and repeat purchases.
Any Plan

Shopify Functions on Any Plan

Shopify Functions are available to merchants on any plan through apps or custom development, not just Plus stores. They cover discounts, shipping calculations, and payment rules. We help you implement Functions via apps on Basic and Shopify, or build custom Functions directly on Plus. Get a free site audit to see which approach fits your store.

Your Options

If You Need Fully Custom Checkout

If you truly need a fully custom checkout that you own end-to-end, your options are limited on Shopify.

Leave Shopify

Use a headless commerce platform (like Medusa, Saleor, or commercetools) where you own the entire frontend including checkout. We optimize Magento and custom/headless checkouts for clients who need that level of control.

Headless Shopify

You can build a custom storefront using Shopify's Storefront API, but the actual payment/checkout step still redirects to or uses Shopify's checkout. You can't fully bypass it. We optimize the handoff from your storefront to checkout and the checkout experience itself.

Maximize Checkout Extensibility

For most use cases, the combination of UI Extensions, Shopify Functions, and the Branding API on Plus gives enough control to make checkout feel very custom. We help Plus stores get the most out of Extensibility without replacing it.
Our Process

How We Optimize Shopify Checkout

Our Shopify checkout optimization process: from free audit to launch.

01

Free Site Audit

We analyze your cart flow, page speed, payment options, and on Plus, your current Checkout Extensibility setup. Identifies bottlenecks and opportunities. Get your free audit.

5-7 business days
02

Pre-Checkout + Theme Optimization

We optimize cart page, product pages, and the path to checkout. Theme performance, Core Web Vitals, and asset optimization. Works on all Shopify plans.

20-30% reduction
03

Checkout Extensibility (Plus)

For Plus stores: Checkout UI Extensions, Shopify Functions, and Checkout Branding API. Custom fields, trust badges, upsells, and branded checkout.

Full customization
What We Offer

Shopify Checkout Optimization Services

We optimize every aspect of your Shopify checkout experience within your plan's constraints. Pre-checkout pages, speed, payments, and trust signals. Shopify Plus: full checkout customization.

  • Pre-Checkout Optimization

    Cart page, product pages, and the path to checkout. We optimize everything before the checkout lock.

    • Cart page design and upsells
    • Sticky cart and mini-cart
    • Trust badges and security signals
    • Checkout button placement
    • Speed optimization for cart flow

  • Speed Optimization

    Fast-loading stores convert better. We optimize your Shopify theme and assets for sub-3-second loads.

    • Theme performance audit
    • Image and asset optimization
    • App performance review
    • Core Web Vitals optimization
    • Mobile speed focus

  • Payment Options

    More payment methods mean fewer drop-offs. We integrate Apple Pay, Google Pay, BNPL, and regional options.

    • Shopify Payments optimization
    • Apple Pay and Google Pay
    • Klarna, Afterpay, Affirm
    • PayPal and alternative gateways
    • Shopify Markets and multi-currency

  • Shopify Plus Checkout

    Full checkout customization for Plus stores: one-page, custom fields, approval workflows, branded experience.

    • Checkout Extensibility
    • Custom checkout UI
    • Approval workflows
    • B2B and wholesale flows
    • Script Editor optimizations

  • Trust & Security Signals

    Build confidence at checkout. Trust badges, PCI messaging, and security cues that reduce abandonment.

    • Trust badge placement
    • Security messaging
    • PCI compliance display
    • Return policy visibility
    • Guarantee badges

  • Cart & Checkout UX

    Optimize the path from cart to checkout. Sticky cart, upsells, and friction reduction.

    • Cart page design
    • In-cart upsells
    • Mini-cart optimization
    • Checkout button placement
    • Guest vs account flow

Also optimize for Magento, Adobe Commerce, BigCommerce, and WooCommerce. See eCommerce checkout platforms for platform-specific details.

Not sure what's possible on your Shopify plan?

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Common Questions

Shopify Checkout FAQ

Shopify-specific checkout questions. Get a free site audit for your store.

No. Shopify does not allow you to replace their checkout with a fully custom-built one. You cannot host your own checkout, use a third-party checkout, or build one from scratch. Shopify owns the checkout and replaced checkout.liquid with Checkout Extensibility, an app-based framework. We maximize what's possible within Shopify's framework: pre-checkout optimization on all plans, and full Checkout Extensibility customization on Plus. See our eCommerce checkout platforms guide for platform comparisons.
Checkout Extensibility is Shopify's app-based framework for checkout customization. It replaced the deprecated checkout.liquid. With Extensibility, Plus merchants can add Checkout UI Extensions (custom fields, trust badges, upsells), Shopify Functions (discounts, shipping, payment logic), and use the Checkout Branding API for fonts, colors, and styling. We build Extensibility-based solutions for Plus stores: custom checkout UI, branded experiences, and approval workflows. Get a free audit to see what's possible for your store.
Shopify Basic and Shopify plans lock the checkout page. We focus on pre-checkout optimization: cart page design, product page speed, payment options (Shopify Payments, PayPal, etc.), trust signals, and the path to checkout. These changes typically reduce abandonment by 20-30%. For full checkout customization via Checkout Extensibility, you need Shopify Plus.
Shopify Plus allows custom checkout via Checkout Extensibility and Script Editor. We build one-page checkout, custom fields, approval workflows, and branded experiences. Plus stores get the same flexibility as Magento or WooCommerce for checkout design.
We optimize the cart page (sticky cart, upsells, trust badges), improve page speed (theme optimization, lazy loading), add payment options (Apple Pay, Google Pay, BNPL via Shopify apps), and streamline the path from cart to checkout. Even with a locked checkout, these changes significantly reduce abandonment.
Yes. Shopify headless (Hydrogen, custom frontends) and Shopify Plus with custom storefronts still use Shopify Checkout. We optimize the checkout experience and the handoff from your storefront to checkout. We also optimize for Shopify Markets and multi-currency.
Our Shopify clients see average improvements of 25-33% lower cart abandonment and 20-30% conversion increase on pre-checkout optimizations. Plus stores with full checkout customization often see 40%+ gains. We provide ROI projections as part of your free audit.
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Related Services

Shopify Checkout + Related Services

Pre-checkout optimization, payment options, mobile checkout, and one-page solutions. We combine these with Shopify and Checkout Extensibility for maximum conversion.

Get in Touch

Optimize Your Shopify Checkout

Tell us your Shopify plan (Basic, Shopify, or Plus) and we'll show you what's possible within your constraints. Free consultation.

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