Cart Editor
Let buyers change product variants and quantities directly at checkout — without leaving the checkout flow. Cart Editor reduces friction and cart abandonment by enabling quick edits right in the Order Summary sidebar.
Requires Shopify Plus. Cart Editor uses Checkout UI Extensions, which are available on Shopify Plus plans.
What it does
Cart Editor adds editing controls to each product in the Order Summary sidebar at checkout:
Variant change — buyers can switch product options (size, color, material) via dropdown selectors directly at checkout.
Quantity change — buyers can adjust item quantity with a stepper control (plus/minus buttons).
Remove item — optionally let buyers remove products from their cart at checkout.
The widget appears as a collapsible link under each product. Buyers click to expand and make changes — cart updates instantly without page reload.
Step 1: Go to Extra Widgets
In the app sidebar, click Extra widget. Scroll down to find the Cart Editor card and click Select (first time) or Manage (if already created).
Cart Editor is a single-config widget — you have one cart editor config for your entire store (unlike Trust Badges or Custom Banners which support multiple configs).
Step 2: Configure editing options
The editor opens with a two-column layout: settings on the left and sidebar with live preview on the right.
The Editing options section controls what buyers are allowed to change at checkout:
Allow variant change
Buyers can change color, size, etc. via dropdown selectors
On
Allow quantity change
Buyers can adjust item quantity with a stepper
On
Minimum quantity
Lowest quantity allowed per item (shown when quantity change is on)
1
Maximum quantity
Highest quantity allowed per item
99
Allow remove item
Buyers can remove products from cart entirely (shown when quantity change is on)
Off
At least one editing option (variant change or quantity change) must be enabled. If both are off, a warning banner appears.
Step 3: Set trigger conditions (optional)
Control when the cart editor appears using trigger conditions. By default, it shows for all products and buyers.
Toggle between two modes:
No condition
Cart editor always shows for all products and buyers
Set conditions
Cart editor only shows when ALL conditions are met (AND logic)
Available conditions
Subtotal value
Cart subtotal meets a threshold (greater than, less than, equals, or range)
Product price
Product price meets a threshold
Included products
Cart must contain specific products
Excluded products
Cart must NOT contain specific products
Included collections
Cart must contain products from specific collections
Excluded collections
Cart must NOT contain products from specific collections
Customer tag
Buyer must have (or not have) specific customer tags
You can add up to 4 conditions. All conditions use AND logic — every condition must be true for the widget to appear.
For guest checkout (no customer account), customer tag conditions are skipped — the cart editor still shows.
Step 4: Configure display settings
The Display section controls how the cart editor appears at checkout.
Edit link text
Free text
"Change options"
Text shown on the collapsible link. Recommended max 25 characters
Default state
Collapsed / Expanded
Collapsed
Whether the editor starts open or closed at checkout
Variant appearance
Single dropdown
Single dropdown
How variant selectors are displayed
Step 5: Set schedule (optional)
The Schedule section controls when the cart editor is active.
Active date / Start date
When the cart editor becomes active
Set end date
Check to set an end date — uncheck for no expiry
Step 6: Sidebar settings
The right column shows status controls and a live preview.
Status
Toggle between Active (live at checkout) and Expired (hidden)
Widget name
Name for your reference — not shown to buyers (e.g., "Cart Editor #1")
App block
Shows whether the Cart Editor block has been added in the Theme Editor. Click "Go to theme settings" to open the Theme Editor
Preview
Live preview showing how the cart editor will look at checkout. Updates in real-time as you change settings
Preview — expanded state
Click "Change options" in the preview to see the expanded state with variant selectors and quantity stepper:
Step 7: Add the block in Theme Editor
After saving your cart editor config in the app, add it to your checkout page:
Go to Shopify Admin → Online Store → Customize
Navigate to the Checkout page in the theme editor
Click Add block → select AOV Cart Editor
Position the block in the Order Summary section
Click Save in the theme editor
If the Cart Editor block is not added in the Theme Editor, a yellow warning banner appears at the top of the editor page with instructions.
How it works at checkout
Collapsed state (default)
Below each eligible product in the Order Summary, buyers see a clickable link:
Change options ▼
Clicking the link expands the editing controls.
Expanded state
When expanded, buyers see:
Variant selectors — one dropdown per product option (Size, Color, etc.). Out-of-stock options show "(Out of stock)" and are disabled.
Quantity stepper — plus/minus buttons to adjust quantity within the min/max range.
Remove item — if enabled, when quantity reaches minimum, a "Remove this item from cart?" confirmation appears.
All changes apply instantly — cart total updates without page reload.
Edge cases
Single-variant product
Variant selectors are hidden, only quantity shown
Invalid variant combination
Error: "This combination is not available"
All variants out of stock
Dropdowns grayed out
Last item removed from cart
Shopify redirects buyer to cart page
Extension error
Graceful degradation — checkout works normally, widget hidden
Tips
Keep the edit link text short — under 25 characters to avoid wrapping on mobile
Use "Collapsed" as default state — keeps checkout clean; buyers expand only when needed
Set sensible min/max quantities — prevents buyers from ordering unreasonable amounts
Enable "Remove item" carefully — consider whether you want buyers to empty their cart at checkout
Use trigger conditions for specific products — if you sell both physical and digital products, you might only want cart editing for physical items
Test on mobile — the Order Summary sidebar collapses on mobile; verify the cart editor looks good
FAQs
General
Q: Do I need Shopify Plus for Cart Editor? A: Yes. Cart Editor uses Checkout UI Extensions, which require Shopify Plus.
Q: Can I create multiple cart editor configs? A: No. Cart Editor is a single-config widget — one config applies to your entire store.
Q: What happens if I deactivate the cart editor? A: It stops appearing at checkout immediately. Your config is preserved — reactivate it anytime.
Q: Does Cart Editor work with Volume Savings? A: Yes. When both are active for the same product, Cart Editor shows variant editing while Volume Savings handles quantity tiers — no duplicate controls.
Checkout behavior
Q: Where does the cart editor appear on the checkout page? A: In the Order Summary sidebar (right column), directly under each product item. It does not appear in the main checkout flow area.
Q: Do changes update the cart immediately? A: Yes. Variant and quantity changes apply instantly with automatic price updates — no page reload needed.
Q: What happens if a buyer selects an out-of-stock variant? A: Out-of-stock options are marked "(Out of stock)" and disabled in the dropdown. Buyers cannot select them.
Q: What if the buyer removes all items from their cart? A: Shopify automatically redirects the buyer to the cart page when the cart is empty.
Theme Editor
Q: I see a yellow warning banner about the Cart Editor block — what do I do? A: Follow the instructions in the banner: go to the Theme Editor, add the "AOV Cart Editor" block to the Checkout page, and save.
Q: Where should I place the Cart Editor block? A: Add it to the Order Summary section of the checkout page. The extension targets purchase.checkout.cart-line-item.render-after, so it automatically renders below each product line item.
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