A digital promotional graphic for Dunkin' "ProDUNKtivity Week" featuring a free coffee offer for 12/29 with the promo code PRODUNKTIVITY, set against a blurred coffee shop background with a pink frosted doughnut icon and a mobile app interface.

Dunkin Free Coffee 12 29

Dunkin' started a "ProDUNKtivity Week" campaign to help customers get through the "least productive week of the year" as a way to celebrate the end of 2025. On Monday, December 29, Dunkin' Rewards members who entered the promo code PRODUNKTIVITY in the Dunkin' mobile app could get one million free hot or iced coffees of any size. The codes were claimed very quickly, reaching the one-million limit by the early afternoon of the 29th. However, those who successfully added the reward to their account usually have five days (until early January) to use it. As part of a series of year-end deals, this promotion includes a merchandise sweepstakes on New Year's Eve and a free doughnut with any drink purchase on Friday, January 2.

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