Preselect variant options on a checkout

What is variant preselection?

Preselecting variants populates the variant selection with a default choice through query parameters. Customers see the preset option selected and can change it if needed.

How to preselect using variant settings

1. Go to Pages and open the checkout you want to edit.
2. Go to Details → Variants and click on the variant.
3. Open Settings and check Preselect option.
4. Select the default option.
5. Click Save.

How to preselect using URL query parameters

Add the variant Reference and the option SKU value to the checkout URL. You must set the SKU on each option you want to preselect. It is found under Additional settings on the option.

Example:
A variant with reference size has an option "Large" with SKU large.

?size=large

Multiple variants: ?size=large&color=blue