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

  • Easy registration
  • Fast payouts
  • Cashback Bonus

Payment Methods

Bank Transfer Skrill Rapid Transfer Neteller Paysafecard Visa MasterCard ecoPayz
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Top Features

  • Classic slots
  • Easy registration
  • Live Casino

Payment Methods

Skrill Rapid Transfer Neteller MasterCard Visa Paysafecard Klarna ecoPayz
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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

  • Wide choice
  • Popular
  • Low wager

Payment Methods

Visa MasterCard Jeton Neteller ecoPayz Paysafecard Skrill Interac
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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
  • Easy registration
  • Quick Withdrawals

Payment Methods

Visa MasterCard Credit / Debit Cards Sofort Skrill Neteller Trustly Maestro
NYspins
LeoVegas
Royal Panda
SlotsMillion
Casino Gods
SpinAway
Genesis Casino
VulkanVegas Casino
Kassu Casino
Voodoo Dreams
Dunder
Betfair Casino
BGO Casino
CasinoLuck
Bitstarz
Casino.com
Unibet
Casino Joy
Casumo
William Hill
Duelz
EUcasino
Energy
Genting Bet
Grand Ivy
Highroller
Hyper Casino
Kaboo Casino
Mansion
Paddy Power
Ladbrokes Casino
PartyCasino
32Red
PlayFrank
Playzee
Casino Heroes
Shadow Bet
Slotty Vegas Casino
Spin Rider
Spela
Wishmaker
Spinland
Spinia
TempleNile
Twin Casino
Vegas Hero
Casino Cruise
Vera & John
Mr Green
Sloty
21 Casino
Mucho Vegas
Casilando
Casinoland
Spinit
Betsson
Bob Casino
Playamo
10Bet
SpinStation
Betway
Dream Vegas
Metal Casino
JackpotCity
Guts Casino
Slots Magic
Agent Spinner
PlayOjo

What Makes Large Casinos 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 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?

How about trying your hand at live casino table games such as poker, baccarat, craps 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!

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 online casino games for you to play. Here are the devices they should be available for:

  • Android (72.18% of mobile gamblers use it);
  • iOS (26.96% of mobile gamblers use it);
  • Samsung (0.43% of mobile gamblers use it).

International Access

Most well established online casinos accept players and high rollers 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. However, these casinos must accept players coming from the top 5 countries with most gamblers:

  1. Ireland;
  2. Canada;
  3. The United States;
  4. United Kingdom;
  5. Germany.

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. Here are some numbers for casinos to be considered BIG:

  • Slots: 500 or more;
  • Table Games: 30 or more;
  • Live Games: 30 or more;
  • Skill Games: 10 or more;
  • Video Poker: 20 or more.

Responsible Gambling Commitment

Big online casinos are also responsible. In the best UK casinos or the European casinos in general, you will find a lot of attention when it comes to playing responsible online. These casinos have different measures to ensure you won't exaggerate and play the money you don't need. Here are some options available on these largest (and responsible) casino sites:

  • Deposit limits;
  • Withdrawal limits;
  • Game session limits;
  • 24/7 helpline;
  • Link to Begambleaware.org or similar.

Wide Choice of Payments

Whether you play the casinos licensed from the UK Gambling Commission or the famous Malta Gambling Commission, 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 or e-wallets, Neteller, PayPal, Skrill, Bitcoin (where legal) VIP Preferred and many other methods available for quick withdrawals and easy deposits. Here are some of the common options in these casinos:

  • Online Casinos With PayPal

    PayPal has won multiple awards and is viewed as a faster and easier way to pay online. Nowadays, it is also a preferred payment method for online gaming. It is currently available to players from the following countries: UK, Austria, Denmark, Finland, Ireland, Italy, Portugal and Sweden. PayPal comes with many advantages including low risk, convenience and optimisation for any device.

    See All PayPal Casinos
  • Online Casinos With Skrill

    Skrill/MoneyBookers is a secure and convenient method to transfer funds online, providing real-time instant payments. You do not need to expose any credit card information when you play at online casinos.. You can fund your Skrill account using credit/debit cards, bank transfer, instant electronic funds transfer, GiroPay and other payment methods in over 30 countries.

    See All Skrill Casinos
  • Online Casinos With Neteller

    NETELLER is similar to Skrill and is the most widely accepted method for playing online. You can fund your NETELLER account using credit/debit cards, bank transfer, instant electronic funds transfer, GiroPay, and supported local payment methods in your country. You can access your account balance and transaction history anytime, anywhere, via the NETELLER website.

    See All Neteller Casinos
  • Online Casinos With PaySafeCard

    PaySafeCard is a pre-paid voucher available at thousands of local shops throughout Europe. They come in increments of €25, €50 and €100. No registration is required, funds are instantly credited. It is not required to use the full value in a single transaction. PaySafeCard is used for deposits only. You can withdraw by wire transfer, cheque, and other methods available on their site.

    See All PaySafeCard Casinos

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, freeplay 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.

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. Click on each casino to read the review and see what bonus is available today to play with real money:

Ranking Casino Games Win Rate
#1 888 Casino 1630 97.68%
#2 Casino.com 1450 96.03%
#3 Rizk Casino 1340 96.68%
#4 William Hill Casino 1420 97.24%
#5 Betway Casino 1280 97.39%
#6 Bwin Casino 1510 97.22%
#7 Unibet Casino 1860 97.33%
#8 Bet365 Casino 1390 95.10%
#9 Betfair Casino 1270 97.03%
#10 LeoVegas Casino 1470 97.63%

Games Available at Large Casinos

You can find a wide array of different online live 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 Playtech or StormCraft Studios.

Best 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.

Keep in mind the best online slots can be divided into several categories. We have selected these categories below, with 3 games for each. These titles can't be missed by the biggest casinos, at least if they want to keep their reputation and weight.

Classic Slots

If you discover that you’re a big fan of the 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. Veteran players love these games and you should check them out:

  • Mega Joker;
  • Break da Bank;
  • Ultra Hot Deluxe.

Video Slots

If you prefer fancy and flamboyant video slots or VLT 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. When you land on the biggest online casino in the world, please, check for these games:

  • Gonzo's Quest;
  • Wolf Gold;
  • Book of Dead.

Jackpot Slots

Adding up to a huge total win, jackpot online 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. Go and play these games in the largest online casinos:

  • Mega Moolah;
  • Divine Fortune;
  • Megabucks.

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. Here are our top megaways slots:

  • Buffalo Rising Megaways;
  • Medusa Megaways;
  • Montezuma Megaways.

The biggest live casino tables

Table Games

A large casino usually has a huge variety of different tables. 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 casino bonuses available for players who prefer these games. This means that both slot players and 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 casino and table games section for the latest and best game offerings.

Live Casino Tables

Nowadays, a live casino is essential. The largest online casinos know this, and they strive to offer a full solution of live dealer games to their players. It's almost impossible to find a casino without a live dealer section. You can find many professional dealers, speaking different languages too. Here are the live games big casinos cannot miss:

  • Roulette Live;
  • Blackjack Live;
  • Football Studio.

Bingo and Instant Wins

Instant win games, like scratch cards and lottery tickets, are often found under the games section of larger casinos. Simply place your 1st 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. Here are the unmissable games:

  • Pig Wizard;
  • Wish Upon Jackpot;
  • Lucky Numbers.

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.

  • Bonanza Megapays;
  • Queen of Alexandria;
  • Arabian Nights.

Sportsbook

If you know our website, you know we're all about casinos. However, a decent sports betting platform offer can't be missed in the biggest online casino in the world. There are so many sports out there and so many winning opportunities, that is almost impossible to find a website without a sports section.

Largest Online 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 sign-up bonus 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. Keep in mind all the bonus listed are valid for the first deposit of new players and there are some wagering requirements.

Bonus funds, bonus spins and all the promos you get when depositing are intended to be played accepting the terms and conditions (read the full T&C before playing) you'll need to accept as new customers. Most of the promos in the largest casinos need a minimum deposit to be done prior to receiving the bonus money.

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.

Largest Casinos in the World

We know the story: different casinos, different licenses. For this reason, the world's biggest online casino won't be the same in the UK and Canada. We have divided the list of the largest casinos by country, to give you a better overview of them.

Largest International Casinos

There are plenty of casinos in the world, and most of them are very active with advertisements on TV and social media, suck as PlayOJO or Grosvernor – 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.

Ranking Casino Payout Speed Win Rate
#1 Betway Casino 2 days 97.39%
#2 Bwin Casino 2 days 97.22%
#3 Unibet Casino 1-5 days 97.33%
#4 Bet365 Casino 3 days 95.10%
#5 Betfair Casino 2-3 days 97.03%

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 British casino bonuses and huge amounts of fun.

Ranking Casino Payout Speed Win Rate
#1 888 Casino 2 days 97.68%
#2 Casino.com 2 days 96.03%
#3 Rizk Casino 2-5 days 96.68%
#4 William Hill Casino 3 days 97.24%
#5 Betway Casino 2 days 97.39%

Largest Casinos in the EU

Playing in the EU? There are plenty of casinos licenced across the continent, including European online 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

Ranking Casino Payout Speed Win Rate
#1 Vulkan Vegas Casino 2 Days 97.04%
#2 Jackpot Village Casino 2 Days 96.20%;
#3 Yaa Casino 3 Days 97.40%
#4 Rizk Casino 2 Days 96.68%
#5 CasiGo 2-5 Days 97.15%

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 casinos, top slots, and the best bonuses around, here are some of the largest casinos in Canada.

Ranking Casino Payout Speed Win Rate
#1 Vulkan Vegas Casino 2 Days 97.04%
#2 Caxino Casino 2 Days 96.40%
#3 Wildz Casino  3 Days 98.17%
#4 Jonny Jackpot Casino  3 Days 96.26%
#5 NYSpins Casino  2 Days 95.40%

Largest Casinos in the US

There are quite a few big players when it comes to the best US online casinos – from the popular online 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!

Ranking Casino Payout Speed
Win Rate
#1 Gambino Slots 2-5 Days94.12%
#2 Draft Kings 2 Days
96.48%
#3 Lucky Land Slots
2 Days
97.45%
#4 Chumba2 Days
96.10%
#5Global Poker
2 Days
96.10%

Largest Casinos in Asia

Asia is wide and there are casino players from Indonesia and experienced gamblers from Vietnam, looking for those wide casinos with hundreds of games online. Here's a list for them, with the biggest casinos accepting Asian players to gamble:

Ranking Casino Payout Speed Win Rate
#1 888 Casino2 Days 97.68%
#2 Betway Casino
2 Days 97.39%;
#3 Yaa Casino 3 Days 97.40%
#4 Rizk Casino 2 Days 96.68%
#5 22Bet Casino 2 Days 98.28%

Largest Casinos in India

India has some unique features, and one of these is the huge number of gamblers. Among the best online casinos in India, there are some giants we are going to list below. What we have considered? Easy: number of games, players, licenses, years on the market and general reputation:

RankingCasinoPayout SpeedWin Rate
#1Vulkan Vegas Casino2 Days97.04%
#2GG Bet Casino2 Days98.05%
#3Videoslots Casino
3 Days96.72%
#420Bet Casino3 Days96.50%
#5Yaa Casino
2 Days98.28%

Pros and Cons of These 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? Let's have a look at the pros and cons brought by our team of experts.

  • Wide selection of games and slots
  • Better welcome offers and bonuses
  • Many licenses acquired
  • Customer service available in more hours
  • More general, and less targeted

Play the Largest Online Casinos or not?

When it comes to choosing between the small or the big online casinos, it becomes very personal. Some people love the feeling of being part of something big, while others feel the opposite. Personally, we trust the largest casinos because they have more experience in dealing with customers and solve any kind of problem.

The bonus offers will be bigger and the selection of games too. The biggest casinos usually have a great VIP scheme, where you can increase your status and get nice bonuses. Also, due to the many licenses they may have, you can play under different jurisdictions, even when abroad. 

If you are a new casino player, we suggest you create a gaming account on one of these casinos, in order to have a better casino experience and no problems during the deposit or cash out of your winnings. Experience matter when it comes to online gambling, keep it in mind.

Big Online Casinos FAQs

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.

What are the largest online casinos?

The largest online casinos are Unibet, 888, Betfair and William Hill.

Giuseppe Faraone
Giuseppe Faraone
Author
279 Articles
Based in Valencia, Spain, Giuseppe gave up Milan for sunny shores. New licenses, new casinos, new bonuses, new games - there's always something to write about. Being so close to the action in the gambling industry, he's on top of any new developments the minute they come through the door. Aiming to deliver updates and comprehensive information to you, he does his best to thoroughly test out and rate what he reviews.
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