Largest & Biggest Online Casinos

Do you find yourself wanting to play at some of the biggest and best online casinos? With their expertise, they can be some of the best casinos to take for a spin! We’ve prepared a complete list of these large casinos, with the best range of gambling options. All of the online casinos listed below have a huge number of casino games in their arsenal. Now that’s a lot of winning! Let's have a look at these online casinos.

Biggest Online Casinos in 2021

Rank Rating Bonus Offer Secure Link
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Top Features

  • Live Casino
  • Jackpot slots
  • Fast payouts

Payment Methods

Visa MasterCard Neteller Skrill Trustly Bank Transfer Credit / Debit Cards Revolut
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Top Features

  • Tax Free Winnings
  • Excellent Support
  • Low wager

Payment Methods

Visa MasterCard Skrill Neteller Apple Pay Bank Transfer Interac Maestro
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Top Features

  • Highroller
  • Top Bonus
  • 24/7 support

Payment Methods

Visa MasterCard Neteller Skrill Trustly Paysafecard Credit / Debit Cards Revolut
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Top Features

  • Jackpot slots
  • Live Casino
  • Super-secure

Payment Methods

ecoPayz Maestro MasterCard Neteller Paysafecard Visa iDeal Sofort
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Top Features

  • Live Casino
  • Easy registration
  • Classic slots

Payment Methods

MasterCard Visa ecoPayz Paysafecard Boku Trustpay Paypal Much Better
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Top Features

  • Jackpot slots
  • Live Casino
  • Sportsbook
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Top Features

  • Easy registration
  • Live Casino
  • Player's Choice

Payment Methods

Visa MasterCard ecoPayz Neteller Skrill Trustly Astropay CashtoCode
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Top Features

  • Easy registration
  • Fast payouts
  • Jackpot slots

Payment Methods

MasterCard Neteller Paysafecard Visa EntroPay Neosurf Trustly Skrill

Top Features

  • Editor's choice
  • VIP
  • Easy registration

Payment Methods

Klarna Visa MasterCard Credit / Debit Cards Sofort Skrill Neteller Trustly
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Top Features

  • VIP
  • Top Bonus
  • Super-secure

What Makes Large Casinos so Great?

The largest online casinos are able to give an unparalleled experience for online gambling. With the best range of games, a huge slot game volume and some of the best industry bonuses, large casinos have the best of the best available to them. Some smaller casinos might not have the same resources available.

Pick from the best and biggest range of casino games available. Slots of every kind, including movie themed video slots, classic fruit slots and jackpot slot are all waiting to be played at these casinos. If you’re on the lookout to chase a truly massive win then why not try out one of the many progressive slots you’ll find at these large online casino sites?

How about trying your hand at live casino table games such as poker, baccarat or roulette where you’ll have the chance to play against other punters such as yourself? With plenty of games on offer, such as Casino Hold’em, Three Card Poker, Vegas games and everything in between, table game players will not be disappointed!

Which are the biggest online casinos?

Largest Online Casinos so Far

At a glance, here are some of the biggest online casinos you can find that we have reviewed.

Rank Casino Bonus AmountFree Spins Games
1 Rizk CasinoUp to €100501000+
2 Barz Casino Up to €50050 2600+
3 CasimbaUp to €50050 1200+
4 SlotsMillionUp to €100100 3950+
5 Casino GodsUp to €1500300 1500+

What Kinds of Games Are Available At Large Casinos?

You can find a wide array of different online casino games, ranging from well-known games to the most obscure niches. Here you will find the most common slot machines, with a good payout, from popular providers like Starburst by NetEnt as well lesser-known and independent software developers like StormCraft Studios.

Top Online Slots

Players are always on the lookout for a great slot. When you first start out on your online casino journey, opting to play at a large casino might be the best way to go as you can try many different slot games to find out which ones you like best. The largest online casinos tend to have some of the best game providers and have many kinds of slots.

Classic Slots

If you discover that you’re a big fan of classic pub slots with 3-reels and easy gameplay then Merkur, Pragmatic Play, IGT and Novomatic are the software providers with the best games for you.

Video Slots

If you prefer fancy and flamboyant video slots with a good RTP and exciting graphics and lots of different features, then games by Thunderkick, Yggdrasil Gaming, Red Tiger Gaming and Play’n Go are more up your alley.

Jackpot Slots

Adding up to a huge total win, jackpot slots can have potential wins in the hundreds of thousands if you hit on the lucky combo on the reels. These tend to be specialities of the largest online casinos, meaning you are more likely to find these amazing deals when playing at the biggest jackpot slot casinos.

Megaways Slots

When people play the biggest slots, sometimes you want to spice up the gameplay – and Megaways slots make that excitement happen! Megaways Slots are a staple of the biggest online casinos, as they tend to be a reworking of some of the biggest names such as Gonzo’s Quest, brought to you by Big Time Gaming and Red Tiger. The extra reel added by Megaways Slots

Large Casino Bonuses

By choosing to play at a large casino, you have the freedom and variety to try out all of these games. The best thing is, large casinos know that they have lots to choose from, hence why they often have the ability to try out a few with different bonuses or even play for free modes. But what bonuses can you benefit from at a casino? We've laid out some of the most common casino bonuses below.

Type of Bonus Deposit required When is it given?
Deposit Bonuses Yes When adding money to your account
Welcome package bonuses Varies When registering with a casino
Reload bonuses Yes When topping up your account
Refer a friend bonuses  Yes When somebody registers using your referral link 
VIP Casino bonuses  Yes As part of a loyalty program at a casino 
Free Play bonuses Varies Upon bonus conditions being met
Cashback Bonuses Yes When your bet isn't successful
No deposit free spins No When registering with a casino

The biggest live casino tables

The most common casino bonuses which you can find are deposit bonuses (which also include welcome package bonuses and reload bonuses), however, it is not uncommon to see cashback bonuses and VIP and loyalty bonuses in many of the largest casinos. VIP and Loyalty programs are not often found on smaller casinos, so for these, the best ones can be found on the largest casinos.

Live Casino Games and Table Games

A large casino usually has a huge variety of different table and live casino games. Ranging from the standard roulette and blackjack versions to various video pokers and other games like Sic Bo, Pai Gow and Red Dog, players can get the best gaming experience.

To sweeten the deal, even more, large casinos usually have dedicated live casino bonuses available for players who prefer these games. This means that both slot players and live casino players can both enjoy fantastic bonuses, free spins, free bets and no deposit bonuses on their favourite games.

When you visit large casinos, then do not forget to check out their live casino and table games section for the latest and best game offerings.

Bingo, Keno and Instant Win Games

Instant win games, like scratch cards and lottery tickets, are often found under the games section of larger casinos. Simply place your deposit and select your preferred game to reveal your instant prize. If you are lucky, you might be in for a quick win! The best thing about the instant win and scratch cards is that the casino offers them for mobile devices, meaning you can easily play these games on the go.

Huge Progressive Jackpots

If you are a veteran of the gambling industry, you must know the big casinos usually have the biggest jackpot slots. Casinos featuring progressive jackpots are the ones to watch out for in particular – every spin by every player stands to increase the jackpot! With the arrival of Megaways slots on the scene, these jackpots only stand to increase further!

Check out the gambling sites on this page to redeem the best offers in the online gaming industry. T&Cs apply to each offer you select; make sure to read them and some info about the gambling companies of your choice before making a deposit.

Largest International Casinos

There are plenty of casinos in the world – but there are a few which are the biggest movers and shakers. So with the biggest online casinos being some of the best value for players, we’ve put together a few top lists to help you pick.

RankCasinoBonus AmountFree Spins
1VulkanVegas Up to €1000175
2888 CasinoUp to €150030
3Jackpot VillageUp to €50050
4Yaa CasinoUp to €200N/A
5Rizk CasinoUp to €10050

Largest Casinos in the UK

Some of the casinos in the UK with the biggest payouts are the biggest casinos in the industry. With so many to pick from, all licensed with the UKGC, it could be hard to make a decision as to which to pick. We’ve handpicked some of the largest online casinos in the UK, that promise the biggest UK casino bonuses and huge amounts of fun.

RankCasinoBonus AmountFree Spins
1WildzUp to €500200
2Jonny Jackpot
Free Spins500
3NY Spins
Free Spins365
5Spades Planet
Up to £500NA

Largest Casinos in the EU

Playing in the EU? There are plenty of casinos licenced across the continent, including European casinos which accept UK players. Whether you want to play classic slots or take a spin on the biggest jackpots European casinos have to offer, there’s plenty to find in the largest European online casinos. Here are a few of our favourites

RankCasinoBonus AmountFree Spins
Up to €1000175
2Jackpot Village
Up to €50050
3Yaa Casino
Up to €200N/A
4Rizk Casino
Up to €10050
Up to €200100

Largest Casinos in Canada

Canada’s online casino market is super varied, with plenty of casinos available for players. Some of the largest online casinos in Canada are well-known to many players, so it’s not surprising people flock to them to make their deposits and get playing! With live casino, top slots, and the best bonuses around, here are some of the largest casinos in Canada.

RankCasinoBonus AmountFree Spins
Up to C$1000175 
Up to C$500 + C$20 no deposit200 
Up to C$500 + C$20 no deposit 
4Jonny Jackpot 
Up to C$1000 
Up to C$1600 

Largest Casinos in the US

There are quite a few big players when it comes to US online casinos – from sweepstakes casinos to the online versions of some of the biggest casinos in the business, there’s plenty to pick from if your state is one of those which allows for online gambling!

RankCasinoBonus AmountFree Spins
1Gambino Slots
2Draft Kings
Up to $10N/A
3Monkey Knife Fight
Up to $50N/A
$5 FreeN/A

Pros and Cons of the Biggest Online Casinos

There are advantages and disadvantages to every casino, but what is there to gain and avoid when it comes to the biggest online casinos?

Pros Not found icon

  • Great mobile casino access
  • Better international options
  • Huge range of games
  • More payment method options

Cons Not found icon

  • Sometimes hard to become used to
  • More general, and less targeted

Advantages of the Largest Online Casinos

There are many advantages of playing at established mobile casinos because they’re some of the best in the business and have been around for a long time. The following are some of the advantages that players will benefit from when playing at the largest online casinos. If you’re a beginner then the more options you have to choose from, the better. Playing a wide variety of casino games is the only way to find out which ones are your favourite (and there will be many), and which ones you excel at the most.

Don’t be afraid to experiment with a particular casino game you’ve never attempted before – bonuses or free play options at larger casinos will help you try more out!

Better Mobile Casino Access

Playing at a large casino also gives you the opportunity to use different devices. Perhaps you want to finally try playing your favourite slots or table games on your mobile device? There’s no better way to be a winner while on the move than by choosing a casino that has a wide variety of mobile games for you to play.

Better International Access

Most well established online casinos accept players from a number of regions, as long as it's legal to play in that certain jurisdiction. For instance, whether you're looking for the best Canadian online casinos or the largest casinos in the UK, chances are that the largest ones accept all players.

Huge Range of Games

Last but definitely not least, a great reason to play at huge online casino sites is due to the range of games available that you may not find at smaller casinos. These are games other than slots and table games, but rather the more casual games such as scratch cards, bingo games, lotteries and so much more!

The possibilities are endless when playing at the best online casino sites boasting large catalogues of games from different software providers, so be sure to try out one of the many options we have listed on this page.

Wide Choice of Payment Methods

Whether you play the casinos licensed from the UK gambling commission or MGA, or any other respected legislator, you will find a wide choice of payment methods to play. The largest online casinos offer payment options such as debit cards, Neteller, PayPal, Skrill, VIP Preferred and many other methods available for quick withdrawals and easy deposits.

Disadvantages of the largest casinos

Sometimes the biggest online casinos can seem a little intimidating. Perhaps you feel they won’t be great value for money, or that you won’t have great customer service. These, however, aren’t an issue on the sites that we list.

One downside with large casinos is they may be less targeted – perhaps you like your casino to offer very specific payment methods, or to be designed around a theme. In this way smaller casinos excel – but that doesn’t mean you can’t find an amazing experience at a larger casino!

biggest online casino = biggest game selection

Huge Range of Games

Last but definitely not least, a great reason to play at huge online casino sites is due to the range of games available that you may not find at smaller casinos. These are games other than slots and table games, but rather the more casual games such as scratch cards, bingo games, lotteries and so much more!

The possibilities are endless when playing at the best online casino sites boasting large catalogues of games from different software providers, so be sure to try out one of the many options we have listed on this page.

FAQs About the Largest Casinos

Wondering more about the internet’s biggest online casinos? Check out our FAQ below to find your answers.

Do the biggest online casinos offer better welcome bonuses?

Yes and no - it depends on the casino itself! The biggest online casino are generally able to offer a larger welcome bonus or deposit bonus, for example, but it doesn't always follow that they will choose to. Check the bonuses available to you on our top lists to see!

What benefit is there in playing with the largest casinos?

They have the capacity to offer some of the best bonuses and promotions, often without a casino promo code. They also have the best range of casino games and often have 24/7 customer support.

Can I get a no deposit bonus at the largest online casinos?

Yes, many of the largest online casinos offer amazing no deposit bonuses when you register! Simply check out the bonuses or promotions page of the casino you want to play at to find out how to play with these bonuses.

This page was written in 2015 and is now maintained by Sean Johnson. Should you have any questions or see any discrepancies on this page, feel free to reach out to him at The casino list at the beginning of the page is revised each month, to ensure we only offer the very best casino sites to our readers.

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