Every Friday through December 28, at participating McDonald's restaurants, place an order of $1 or more via Mobile Order & Pay on the McDonald's app for iOS or Android and get medium fries for free. (Tap "Start Your Order" under Mobile Order & Pay, then tap "Deals" and scroll down to select this offer. Tap "Add to mobile order" to get this deal.) That's a savings of about $2 and a great deal for McDonald's fries. Some exclusions may apply. Deal ends December 28.

Note: This offer can only be redeemed once per customer per visit.