A player from Belgium played at their favorite online casino and won the eight-digit sum after reportedly only spinning the slots a handful of times. On the 28th of September 2018, Mega Moolah engraved its name in the history of rewarding jackpots for good by handing out yet another historic prize. Right in the middle of this list is the very first WowPot jackpot hit for Games Global. Right after New Years celebrations in 2019, a lucky player was playing Mega Moolah at Zodiac Casino when they Wise Slots hit the fantastic Mega jackpot. We hope you're not tired of reading this little fact, because we'll probably keep repeating it until the list ends. Sometimes, online casino jackpot winners ask to remain unnamed for the fear of being targeted for their new-found wealth. On August 20, 2020, Microgaming confirmed another astounding online casino jackpot winner. The first game on the list is Mega Moolah, and that’s not the first time you will see this game appear on this list as the jackpot-winning game.
For these reasons, all of the big wins listed here came from recreational gamblers who just happened to get lucky, rather than professional streamers. Before the maximum stake limits of £5 for those aged 25+ and £2 for gamblers aged were introduced in September 2024, UK streamers could also have used these very high stakes. Speaking of ridiculously high stakes, it was decided to exclude any wins from online casino streamers showing their wins on video-sharing sites for a couple of reasons. All of the wins came from hitting a jackpot on a progressive jackpot slot, as these are by far the biggest payouts available from slots, at least without using ridiculously high stakes on regular slots. As such, this won't necessarily be a definitive list of the biggest UK winners to date. There's a lot of conflicting information about big casino winners on the internet, with some overseas players being incorrectly listed as UK players, and some wins that are mentioned in a couple of places but aren't easily verified. When selecting the big winners for this list, care was taken to make sure that there was a reliable source for the win.
A British player at the Grand Mondial Casino clinched a $23.5m jackpot (about £18.9m), setting a new benchmark that was only slightly overtaken later. Mega Moolah, a frequently mentioned name on this list, stands out as a leading progressive jackpot slot. Diving into the tales of the biggest online casino jackpot wins, we uncover not just the amounts but the stories behind these extraordinary moments. Dorking banker Martin Proctor discovered he had won a share of the jackpot when he checked Teletext that evening, allowing him to immediately set his sights on a new dream house with a swimming pool. They said they would buy a new home, go on a family holiday to New Zealand and upgrade their Skoda Octavia to a Skoda Superb or a Volvo so that Gerry could fit his golf clubs in the boot. The couple, who were both teachers, added that it ‘didn’t seem real’ when they realised they had won and that family members took a long time to be convinced.
First, check which welcome offer the casino is currently running from the list above, and read the terms before you sign up. Already have an account at Virgin Games Casino? Virgin Games is the only casino on this list built around games you cannot play anywhere else. NetBet is the slots specialist in this top 10, with one of the largest reel libraries of any operator I rate and a welcome offer built entirely around them. New players get 70 no deposit free spins, with a further offer of up to 200 free spins available on a £10 deposit, which makes it the lowest-risk way onto this list. It also runs one of the larger spins bundles on the list, credited on Big Bass Splash. BetMGM is the strongest mobile experience in my top 10, with native apps on both iOS and Android and a library of more than 2,000 games behind them. Already have an account at Betfred?
UK Peoples Postcode Lottery
This jackpot continues to increase until a lucky player triggers it, either through a special bonus feature, a random event, or a specific symbol combination. Jackpot slots are popular among players who love to chase the big win and don’t mind taking big risks either. While stats like RTP and volatility are important, player opinions reveal how enjoyable and rewarding a game actually feels in practice. Players often prefer titles with more regular, achievable wins, even if the top prize is smaller. Theme and design greatly influence the appeal of progressive jackpot slots. I rank higher those slots that combine creative mechanics with fair chances, as they enhance both entertainment value and the potential for jackpot wins.
Their record jackpot win was a jaw-dropping $2.72m (£2.15m) in September 2013. BTG offers you titles such as Bonanza Megapays, Star Clusters Megapays, Danger High Voltage Megapays and Who Wants to be a Millionaire Megapays. Megapays offers 4 progressive jackpots with the Mega Jackpot beginning at £300,000. With just winner to date, a lucky player won €10,973,078 on Gold Blitz King Millions in February 2025. Offering 2 colossal progressive jackpots seeding at £1 million (Major Jackpot) and £2 million (Grand Jackpot), expected wins should exceed £30 million. With 4 progressive jackpots, the series gives players unmeasurable exhilaration and great payouts. A lucky player enjoyed a €2.97 million payout not too long ago (February 2024) and there have been 21 Mega Jackpot winners to date (at the time of writing).
Bonuses and promotions
We’ve put together a list of the highest paying online casino games, so you can keep the house’s edge under wraps. In the short term, results are heavily influenced by volatility, so it’s possible to win much more or lose much more than the RTP suggests. It’s calculated over a very large number of spins or rounds, so it doesn’t predict what will happen during a single session or over a handful of bets. Likewise, a blackjack game with a 98.7% RTP has a house edge of 1.3%. A game’s RTP tells you the percentage of stakes it is programmed to return to you over the long term. Trustworthy operators are also open about how their games are tested. The best payout online casinos in the UK typically feature games with RTPs of 96% or higher, with some titles exceeding 98%. That included navigation, loading speeds, account management, and whether key features felt intuitive.
On the other hand, the smallest jackpot payout ever is $/£/€632. You are playing for straight up symbol payouts and for the jackpot prize itself. Super Diamond Deluxe Jackpot is a very simple slot coming from Blueprint Gaming. The top jackpot prize on the game is awarded randomly and can be won on any bet size. But the slot has been known to seed for a much longer time, bringing the top jackpot prize to hundreds of thousands of dollars. Diamond Valley is a simple 5 payline slot with a design native to older Playtech slots. The lowest payout on the other hand is just under €2,000.