How to Limit Quantity per Collection on Shopify

Maximum collection quantity

Add a Collection Max Quantity limit, pick the collection, and set the cap. Checkout is blocked if the cart holds more than that many items from anywhere in the collection.

Applies to: All Shopify plans
Any Shopify collection, manual or automated
Doesn't apply to: Capping one product — use maximum product quantity
Limits across separate orders

Capping a single product instead? Use maximum product quantity

The cap that closes the obvious loophole. Limiting each product to two does nothing if the range has ten products — a collection cap limits the range as a whole.

Before you start

The collection, and the cap across it.
Whether an automated collection would be easier to maintain than a manual one.

Steps

1. Install Nex Validator

Search Nex Validator in the Shopify App Store, or use the button below. Approve the permissions and the app appears in your admin under Apps. There is a free trial, and it works on every Shopify plan.

Install on Shopify Already installed? Skip ahead

2. Go to Simple Order Limit → Create Rule.

3. Give the rule a title, and switch Enable/Disable Limit on. A rule that is saved but not enabled looks identical to one that is not working.

4. Open the Collection tab, choose Collection Max Quantity, and pick the collection and set the cap.

5. Write the message, then save, naming the range so the customer knows which items to remove.

Verify it worked

Cart above the cap, spread across several products in the collection → blocked.
Cart at the cap → completes.
Cart mixing collection and non-collection items → only the collection items count toward the cap.

Common setups

Goal	Maximum
Limited edition line	2 across the range
Regulated category	Whatever the rules require
Event merchandise	Per-attendee allowance
Clearance, to spread stock	3–5

Frequently asked

Why cap a collection instead of each product?

It stops the workaround. A per-product cap of 2 across a ten-product range still lets someone take twenty; a collection cap of 2 means two from the whole range.

Does an automated collection work?

Yes, and it is often the point — a tag-driven collection lets you cap a category without maintaining a list.

Does it stop a second order?

No. It caps one cart.