Score a Free Medium Fry at McDonald's with no purchase required! Find this under the 'Deals' section of the McDonald's app. Expires 1-31. Limit one offer per person per visit. Must have a McDonald’s rewards account (free to join) to redeem.
If this offer doesn't pop up right away, try clicking 'Order' at the bottom of the app, then looking in the 'Deals' section from there.