A merchant using the Prestige theme wants to add a quantity selector to the checkout page, allowing customers to adjust item quantities after viewing their order total without returning to the cart page.
Key Limitations Identified:
Shopify’s checkout page is locked and cannot be customized on standard plans
Customization is only possible with Shopify Plus, though options remain limited for security and consistency
The checkout is intentionally streamlined to minimize distractions during purchase completion
Suggested Solutions for Plus Users:
Use Shopify’s Checkout UI extension components, specifically the Stepper component, to create a quantity selector
A third-party app currently exists that enables this functionality
Alternatively, hire a developer to build a custom app for the store
The discussion confirms this feature is achievable only on Shopify Plus plans, with implementation requiring either app installation or custom development work.
Summarized with AI on November 15.
AI used: claude-sonnet-4-5-20250929.
Hi there, we’d like to add the quantity selector to our checkout pages, we are using Prestige Theme.
Our customers can increase or decrease their selected number of items on the cart page and the quantity selector is working fine but we want to give them the option of being able to add 1 or 2 more items to their order if they feel the need to do so once they are on the checkout/order page where they can see the total they are about to spend (so they don’t have to go back a page to increase it).
Just adding to @ZenoPageBuilder 's reply here, that even in the Shopify Plus plan, keep in mind that customization options are still limited in order to maintain a consistent checkout experience for customers. The checkout page is a secure and standardized part of the Shopify platform, so limiting its code access helps us ensure that the information processed on checkout is kept safe at all times.
Remember also that the checkout page is designed to streamline the purchasing process and minimize distractions overall, so it typically only displays the order summary and necessary fields for completing a transaction.
In saying this, your request is indeed achievable if you’re on the Shopify Plus plan. A third-party app currently exists that will allow you to add the quantity selector on checkout, which you can take a closer look at here. Otherwise, a Plus store could also hire a developer to assist them with building a custom app to install directly within their store. The app can utilize Shopify Components, more specifically the Stepper component, to create the quantity selector on checkout. Other Checkout UI extension components listed here may also assist with this.
