The above casinos give away a free spins bonus to new customers. For some free spins bonuses you just have to register and no deposit is required, for other bonuses you will first have to make a deposit.
What is a free spins bonus?
A free spins bonus consists of a number of free spins on a slot machine. The number of turns varies per casino. The slot machine you play them on is usually determined by the casino. You can receive a free spins bonus in several ways:
As a bonus without deposit: register at the casino and receive your free spins bonus immediately
As part of a welcome bonus: make a 1st deposit and you will receive your free spins bonus. Sometimes you also get free spins on follow-up deposits
As part of an interim bonus: these are often temporary offers that you receive over the mail. You often have to deposit and / or play an x amount to receive your free spins
To introduce a new slot machine: when a new title comes out this is celebrated with free spins.
Most free spins bonuses are given away on Netent online slots, with Starburst by far the most popular. Free spins on new Netent titles are also popular. Recently we also see free spins bonuses on Thunderkick slots and Microgaming slots.