Want a free McDonald's meal? Its simple! Just keep your last McDonalds receipt and visit mcdvoice.com survey. Complete the quick customer satisfaction survey by entering the code printed on your receipt. Once done, youll 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 varysome 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.