Want a free McDonald's meal? It’s simple! Just keep your last McDonald’s receipt and visit www.mcdvoice.com survey . Complete the quick customer satisfaction survey by entering the code printed on your receipt. Once done, you’ll receive a validation code. Write this on your receipt and take it to any participating McDonald's location to claim your free meal. Offers may vary—some locations give a free sandwich, others a full meal. Make sure to complete the survey within 7 days of your visit. It's a great way to enjoy your favorite food while giving helpful feedback to McDonald's.