Main article: Shuffling

Shuffling is the process of bringing the cards of a pack into a random order. There is a large number of techniques with various advantages and disadvantages. Riffle shuffling is a method in which the deck is divided into two roughly equal-sized halves that are bended and then released, so that the cards interlace. Repeating this process several times randomizes the deck well, but the method is harder to learn than some others and may damage the cards. The overhand shuffle and the Hindu shuffle are two techniques that work by taking batches of cards from the top of the deck and reassembling them in the opposite order. They are easier to learn but must be repeated more often. A method suitable for small children consists in spreading the cards on a large surface and moving them around before picking up the deck again. This is also the most common method for shuffling tiles such as dominoes.

For casino games that are played for large sums it is vital that the cards are properly randomised, but for many games this is less critical, and in fact player experience can suffer when the cards are shuffled too well. The official skat rules stipulate that the cards are shuffled well, but according to a decision of the German skat court, a one-handed player should ask another player to do the shuffling, rather than use a shuffling machine, as it would shuffle the cards too well. French belote rules go so far as to prescribe that the deck is never shuffled between hands.