How to Make the Billing Form PIN Code Field Optional in WooCommerce?

If you want to make the postcode field optional in the WooCommerce checkout billing form, you can use the following code snippet. This code modifies the default address fields to set the postcode as not required.

add_filter( 'woocommerce_default_address_fields', 'customise_postcode_fields' );
function customise_postcode_fields( $address_fields ) {
    $address_fields['postcode']['required'] = false;

    return $address_fields;
}

Output

The below output shows that the Postcode has changed from a required field to an optional field in the WooCommerce checkout billing form.

Additionally, you can also change postcode shipping field to a dropdown in WooCommerce checkout page.