Get a FREE medium fry from McDonald's with any $1 minimum purchase today! Only in the McDonald’s app. Must be opted into Rewards. Valid 1x each Friday thru 12/31/23 at participating McDonald’s. Excludes tax. If you aren't signed up for MyMcDonald’s Rewards, you can join and get a free large fry with $1 minimum purchase. Plus, when you join MyMcDonald’s Rewards, you start earning points on every eligible order—points you can put towards more free food.