Want to get free food from McDonald's? Just take the McDVoice survey at www.mcdvoice.com survey ! After making a purchase at McDonald’s, keep your receipt. It contains a 26-digit survey code, which you'll need to access the online survey. Once completed, you'll receive a validation code that you can write on your receipt. Bring it back on your next visit to redeem free food or discounts. The survey takes only a few minutes and helps McDonald’s improve service while rewarding you in return. It's a win-win for customers looking to enjoy a free treat at McDonald's!