The largest jackpot of all time was a $23.6m bonanza (around £19m) landed by one player from Belgium back in 2021. The logic is that the more popular a jackpot slot is, the quicker the jackpot will rise – and so will its size – hence its ubiquity on the list of biggest online casino payouts. This cumulative effect sees the prize fund increase every single minute of the day until somebody, somewhere triggers the payout with the required combination of symbols. What’s a progressive jackpot slot, you may be thinking? This is a game in which all players, no matter where they are and which online casino they are using, feed into the jackpot with every spin of the reels. This is why any reputable online casino from the newest one on the market to those that have been around for years all want to have Mega Moolah in their games libraries.

Mega Moolah is a jackpot slot that will feature a few times on this list, and the reason for that is simple: it is one of the most popular progressive jackpot slots around. There aren’t many lottery draws around the world that pay out a jackpot of £19m, which explains why online casino gamers are happy to try their luck with jackpot slots instead.