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

What Makes Large Casinos so Great?

When you are new to playing at online casinos, it might be hard to choose the right one for you, with so many different games available from so many different providers. However, do not be put off by a casino that might look intimidatingly large, because we here at CasinoTopsOnline can tell you exactly what to look out for when it comes to finding great games and even greater jackpots.

The list above contains the very best and biggest range of casino games available. Slots of every kind, including movie themed video slots, classic fruit slots and jackpot slots 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?

Perhaps you’re looking for the classic casino experience to play in your free time? 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

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

Casino Rating Countries Free Play
VulkanVegas 8.5/10.0 CA, UK, IN, NZ, ROW, IE Yes
Rizk9.4/10.0 CA, UK, IE, EU, ROW Yes
VideoSlots 8.1/10.0 CA, UK, NZ, IE Yes
Leovegas 8.5/10.0 CA, DE, UK, NZ, EU, ROW Yes

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. Large casinos pride themselves in being able to cater to the needs of all online casino visitors and they can only do so by offering every single casino option available – from keno to bingo to sports betting, you can find everything.

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.

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.

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.

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.

Large Casino Bonuses

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 BonusesYesWhen adding money to your account
Welcome package bonusesVariesWhen registering with a casino
Reload bonusesYesWhen topping up your account
Refer a friend bonuses YesWhen somebody registers using your referral link 
VIP Casino bonuses YesAs part of a loyalty program at a casino 
Free Play bonusesVariesUpon bonus conditions being met
Cashback BonusesYesWhen your bet isn't successful
No deposit free spinsNoWhen registering with a casino

The biggest live casino tables

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 scratchcards 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 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 ever 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.

perks of playing the largest online casinos

Advantages of Playing at Established Online Casinos

There are many advantages of playing at established mobile casinos, but the main reason why it’s advantageous is because of the solid experience they would have accrued over the years in delighting their players. The following are some of the advantages that players will benefit from when playing at the largest online casinos:

  • Bigger selection of casino games;
  • Fast Withdrawal times;
  • 24 Hour support;
  • Unparalleled mobile experience through mobile apps;
  • More bonus offer & promotions on 1st deposit;
  • More payment methods available;
  • Regulated by the most respected regulatory bodies in the industry.

Largest Online Casinos: Quantity Over Quality?

One can argue that large casinos focus more on quantity than quality, but we beg to differ. Some of our favourite large online casinos are listed in our top 10 online casinos.

We chose to promote these casinos because they are frequently updated, offer weekly and monthly deals and welcome bonuses and generally provide excellent customer support across multiple languages. Reputation is everything for them – so they make sure their customers love them by providing a great experience!

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!

Benefits of a Larger Casino

There’s plenty of choice and a great wealth of options when playing at a large casino – but what are the biggest draws for players after a gaming experience at the largest online casinos? Here's a final roundup of the biggest factors in why they might be right for you.

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 ones in the UK, chances are that largest ones accept all players.

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.

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. 


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!

Which is the largest online casino in the world?

The largest casino in the world is 888 casino. This online casino is available in almost all countries in the world, including the US. It is so large, that it not only offers traditional casino games and slots, but has an entire wing of the website dedicated to sports betting, too. You can read our full 888 Casino review by scrolling up!

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.

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. Let's have a look at some handpicked references you may find interesting.

References for This Page