Are Shopify discount codes case sensitive?

Where does Shopify say capitalization doesn't matter?

Shopify's checkout extensions documentation answers it in one line: “The discount system treats SAVE10 and save10 as the same code.” Four more developer references — the Storefront API cart, its discount-code mutation, the Admin GraphQL lookup by code and the legacy REST resource — call codes case-insensitive: five developer pages, one answer.

The Help Center discount pages we read in October 2026 don't say whether discount codes are case sensitive. The only Help Center line on code case we found, “Gift card codes aren't case sensitive,” is about gift cards, a separate code type.

What can stop a code from applying instead?

Since case isn't the cause, three documented points are worth checking:

• Special characters in the name. Shopify advises avoiding them so the name is added correctly to your store's checkout URL.
• An inactive discount. Shareable discount links and QR codes work only for active discounts, so confirm its status before sharing.
• A draft-order checkout. When the checkout came from a draft order invoice or link, customers can't apply a code themselves by default; add the code to the draft yourself (shipping and Buy X get Y codes aren't supported on draft orders) — see how discount codes behave on draft orders.