McDonald's offers free medium fries with any purchase of $1 or more every Friday, valid through December 31, 2024. This promotion is accessible exclusively through the McDonald's App using the Mobile Order & Pay feature. 

 For just a $1 minimum purchase, unlock a delicious freebie – a Big Mac – by downloading the McD's app and joining MyMcDonald's Rewards!* But that's not all! With MyMcDonald’s Rewards, every eligible order earns you points that can be redeemed for more mouthwatering free food. Why not treat yourself to another Big Mac? The options are endless!