Biggest Online Casino Jackpots in History

Online slots and other casino games have created some of the most mind-blowing jackpots and payouts in gambling history. As online casinos continue to gain popularity around the world, we’re seeing record-breaking wins on a more regular basis.

While land-based casino wins have produced some mega winners, online progressive slots seem to be where the highest payouts happen these days. That’s because internet casino jackpots are pooled across hundreds of different sites, allowing the top prizes to quickly grow into eight and even nine-figure sums.

Top 10 Biggest Online Casino Jackpot Wins

Below, we’ll count down the 10 largest SkyCrown payouts on record as of 2025:

As you can see, Mega Moolah from Microgaming lives up to its name, producing the majority of the biggest online casino payouts over the years. Most winners are playing the mobile version as well, highlighting the growth of online casino apps and mobile compatible games.

Online Slots Provide the Biggest Jackpots

It’s no surprise that online slots provide the biggest jackpots and record wins at internet casinos. That’s due to the huge progressive prizes that slots developers like Microgaming and NetEnt offer.

On a progressive slot, the top prize increases with every bet placed across the entire network. That allows the jackpots to quickly escalate into the multi-million dollar range.

For instance, Mega Moolah starts its jackpot at $1 million, and then keeps rising until somebody triggers the grand prize. The largest Mega Moolah win so far paid out an astonishing €18,915,872, or over $21 million.

Many other slots also provide eight-figure prizes, though, like:

• Mega Fortune
• Mega Fortune Dreams
• Hall of Gods
• Arabian Nights
• Major Millions

These games have all created millionaires with a single spin of the reels.

While slots provide the biggest online gambling payouts, other games have produced massive wins as well:

• A Norwegian player won €11.7 million playing Mega Fortune on his mobile in 2015.
• A Finnish man earned €17.9 million Euros playing the Mega Fortune Touch mobile slot in 2013.
• A British soldier won a £13.2 million jackpot on a Major Millions progressive slot in 2009.

Smart Bet Sizing Helps Trigger Huge Wins

While winning any progressive jackpot requires a healthy dose of luck, bet sizing plays an important role in triggering a mega payout too.

Most online slots require the maximum bet to activate all paylines and make the full jackpot eligible on a spin. If you’re betting too low, you reduce your chances of actually winning the grand prize.

The 25-year-old British soldier who won €17.8 million on Major Millions was playing the max €5 bet. So he spent relatively little for the chance to win millions.

Jon Heywood was also betting the max €6.25 across all 20 paylines when he triggered the record €18.9 million Mega Moolah jackpot.

So while it may be tempting to stretch your bankroll and play pennies, betting too little reduces your chances of winning the biggest online casino prizes.

Verification Process Ensures Winners Get Paid

With jackpots frequently paying seven-figures and higher these days, online casinos take extra steps to verify winners and ensure payouts.

After a big win, expect to go through identification checks, provide documentation, and wait several weeks for payment. Sites need to confirm things like:

• You are who you say you are
• You’re of legal gambling age
• You didn’t break any terms and conditions

But once the verification process is complete, these real money online casinos do pay out record-setting jackpot sums.

That legitimacy and assurance of payment gives players even more incentive to keep trying to hit that mega progressive slot or table game prize.

So while winning tens of millions of dollars takes an incredible amount of luck, these biggest online casino jackpots show anything is possible with the right bet size and a little patience during the payout process.