Largest Online Casinos

If you are a novice player who has just found out that gambling is an entertaining and rewarding activity, you might be wondering how to separate the wheat from the chaff or how to figure out which are the largest online casinos out there.

There are so many casinos on the ever-evolving online gambling market and so many of them declared themselves to be “the largest” that one may get totally confused. The truth is that the casinos that are actually the largest do not compete for honorary titles simply because they have nothing to prove. Check out the essential factors indicating casino’s legitimacy, and have a look at the last section where we have compiled a list of the largest and most reputable online casinos that tick all the right boxes in terms of security, game variety, and customer service.

Which are the largest online casinos?

Available in United States | All casinos

Welcome bonus

€200 + 200 Free Spins

Highlights

Huge game library
Decent welcome bonus
Mobile friendly

9.9

Woo Casino Review

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Players from United States not accepted

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Welcome bonus

€1200 + 260 spins

Highlights

Exclusive VIP Program
Huge game variety
Safe & secure banking

9.6

Captain Spins Casino Review

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Welcome bonus

up to €1100 + 375 Free Spins

Highlights

Over 1500 games
Trusted Payment Methods
Everyday Bonuses

9.6

CasiGo Casino Review

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Welcome bonus

100% up to $1000 + 200 spins!

Highlights

Respected online casino brand
Superior quality games
Bonuses come in all shapes and sizes

8.9

Casino.com Review

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Welcome bonus

Divine €1500 + 300 Free Spins

Highlights

Regulated and legit
Fantastic game variety
Great bonuses for new and existing players

8.8

Casino Gods Review

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Welcome bonus

$€1000 + 200 Free Spins

Highlights

Regulated by respected authorities
Powered by the best software providers
Decent number of payment options

Casino Joy Review

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Welcome bonus

€1000 + 300 Free Spins

Highlights

Flawless mobile compatibility
Diverse game selection
Attractive welcome bonus

Genesis Casino Review

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Welcome bonus

€1000 + 50 Free Spins

Highlights

Massive welcome bonus
Impressive game selection
Verified and trusted casino operator

Vegas Hero Casino Review

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Players from United States not accepted

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Welcome bonus

100% up to €500

Highlights

Many years of industry experience
Hand-picked games
Sleek interface

Mansion Casino Review

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Players from United States not accepted

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Welcome bonus

€1500 + 200 Free Spins

Highlights

Licensed and regulated
Generous bonus offers
Recently launched

Casoola Casino Review

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Players from United States not accepted

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Welcome bonus

100% bonus up to €300 and 20 free spins

Highlights

plenty of chances to win a reward and level up
mobile friendly
holds licenses from trusted jurisdictions

7.4

Casumo Casino Review

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Welcome bonus

€400 on first four deposits + 120 free spins

Highlights

Large game library
Fast payout
Mobile friendly

CasinoChan Review

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Welcome bonus

100% Bonus up to £/€/$150 + 10 free spins

Highlights

Regulated and legit
No wager free spins

Chilli Casino Review

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Casino security and reputation

The first thing you should do when you load a casino site is to check out which jurisdiction has granted it a license. Trustworthy European online casinos usually have a Maltese and sometimes Curacao licenses. To be able to operate in the UK, they must possess a license from the UK Gambling Commission. No reputable casino would hold a license from an offshore jurisdiction. If you decide to open an account at a casino licensed in Panama, for example, you should not expect anyone to protect your interests in case of a dispute.

Also, make sure the site has an SSL certificate (it should have a green locker next to the web address) proving that all sensitive information you enter is heavily encrypted and protected against ill-intended people.

Game selection

The largest online casinos that strive to meet all players’ demands never stay idle. They constantly add new games to their portfolio and sign contracts with new game providers. Still, there are a few renowned online casinos that use the services of one or two providers. 32Red, for example, is an industry pioneer known as a purely Microgaming casino and only the live dealer games are powered by Evolution Gaming.
So, if you see that the casino you have chosen lends its games from NetEnt, Playtech, Microgaming, Play’n’Go, NYX, Red Tiger, SG, Novomatic, you may rest assured that each available game is exceptional on its merits.

Games Mobile compatibility

Due to the rapid technology growth, players are no longer tied to the desktop computers. Every self-respected online casino has a well-optimised mobile site, but the largest among them go an extra mile and release native apps said to be more convenient for playing on the go.

Bonuses and promotions

Some players open a casino account because of the free spins or the free cash upon registration. Once they clear the wagering requirements or figure out that they are impossible to fulfil, they abandon or close their accounts. There are many examples of such failures to retain customers.
Prominent online casinos offer something beyond the welcome bonus. They have a gamification feature, reload bonuses, lower wagering requirements, or different missions for players to unlock and make their stay even more enjoyable. Opening an account at a reputable casino should be equal to erasing the boredom from your life.

Payment methods available

Online casinos are flexible in terms of deposits and withdrawals and most of them support VISA, MasterCard, Neteller, Skrill, Paypal, Euteller, Sofort, bank transfer among others. The caveat is to choose the payment method that has the best deposit and withdrawal limits. Beware that sometimes, fees on deposits and withdrawals apply. In most cases, it is not the casino, but your bank that deducts the fee.

Customer support

The best online casinos usually provide customer support round the clock. Players can get in touch with the customer care agents via live chat, email, and sometimes via phone. To eliminate the language barrier, the largest casinos’ employees speak not only English but also German, Swedish, Norwegian, Finnish, Polish, Russian, etc.

Largest online casinos for 2019

All casinos mentioned below, know the struggles of becoming a successful, recognisable brand in such a competitive industry. They have gone through fines, scandals, lawsuits, and rigorous checking procedures to secure themselves a spot among the most popular providers of online gambling services worldwide.

Each of them is an innovator in the niche and one thing is for sure. They will keep pushing the boundaries to stay on top and be among the casino companies with the largest market share.

If you love switching between slots, live dealer games, and bingo, you will be delighted to know that these casinos offer everything under one roof.

If you fancy a certain type of games, you’d better find the casino offering as many variations as possible. Check out the recommended online casinos offering the largest selection of the most popular casino games.

Casino

Rating

Games#

Bonus

888 Casino

6.5/10

1000

100% up to C$200 + 50 Freespins

Review

Bet 365 Casino

9.8/10

1000

welcome 100% match deposit bonus

Review

Mr Green Casino

9.8/10

1000

100% up to $/€100* + 200* FREE Spins

Review

Largest Blackjack casinos

Blackjack is an iconic game, there is no two ways about it. It requires both skills and a piece of luck to beat the dealer. And remember, in order to win, your hand doesn’t need to be as close to 21 as possible. It just has to be better than the dealer’s. Think carefully and STAND when the risk of exceeding 21 is too high.

Casino

Rating

Games#

Bonus

LeoVegas Casino

8.8/10

1000

Up to £400 in Welcome Bonus Offers + 100 Spins

Review

888 Casino

6.5/10

1000

100% up to C$200 + 50 Freespins

Review

Betspin Casino

8/10

400

Up to C$400 + 150 free spins

Review

Largest Roulette casinos

Roulette is one of the most popular table games and it probably has more variations than you have ever heard of. Apart from the traditional European, American, and French Roulette, there are other variations you might be tempted to try. Beware, though. Each Roulette variation differs in terms of layout and payout. Here are the most intricate online Roulette variations we have found for you.

Casino

Rating

Games#

Bonus

Mr Green Casino

9.8/10

1000

100% up to $/€100* + 200* FREE Spins

Review

Betsson Casino

9.9/10

700

100% Match up to $/€100

Review

Largest slot casinos

The slots sections are usually the largest ones featuring 400 titles on average. Game providers compete against each other to release slots that outshine the product of their rivals, integrate an intricate feature to make it recognisable one. Although we have a soft spot for the NetEnt slots, we cannot deny that there are some really good products courtesy of Novomatic, Yggdrasil, Microgaming, BetSoft, IGT. Playtech also releases eye-catching slots on a regular basis, but we still grieve the removal of the Marvel-themed ones.

Casino

Rating

Games#

Bonus

Slots Million

9.6/10

2000

up to £100 + 100 free spins

Review

Casumo Casino

7.4/10

800

100% bonus up to €300 and 20 free spins

PLAY NOW

Betsson Casino

9.9/10

700

100% Match up to $/€100

Review

Largest poker casino

If you have played poker at a brick-and-mortar casino, you should know that the land-based establishments offer no more than two or three poker variations at once. Online casinos, however, give you the opportunity to engage in a variety poker games, take part in poker tournaments or even get an invitation for private poker events (if you are a VIP player). At specialised poker sites, you will be able to play the all-time classic Texas Hold’em, as well as Omaha, 3-card poker, Caribbean Stud, and other less common variations. To have both a profitable and enjoyable poker game, you should pay attention to the following:
Stacks – normal, small, heads-up, deep, capped, six-max
Tournament format – ante levels, payout, blind levels

Casino

Rating

Games#

Bonus

888 Casino

6.5/10

1000

100% up to C$200 + 50 Freespins

Review

Bet 365 Casino

9.8/10

1000

welcome 100% match deposit bonus

Review

Largest Baccarat casinos online

More often than not, the first table game new players try is Baccarat, as it has the lowest house edge of only 1.06% on a Banker bet, 1.24% on a Player bet, and 14.36% on a Tie. Baccarat is a game with predefined rules – there is no HITs, STANDs, RAISEs or FOLDs. For the same reason, it is the favourite game of high rollers. What’s more, it is the most commonly played table game in the Asian gambling haven – Macau. In case a Macau getaway is not on the agenda, check out the best online casinos where you can play Baccarat from the comfort of your home or while on the go.

Guts – Baccarat Lobby, Baccarat A, Baccarat Controlled Squeeze, Baccarat Squeeze, No Commission Baccarat, Speed Baccarat, Speed Baccarat B

LeoVegas – Punto Banco, Baccarat Pro High, Baccarat Controlled Squeeze, Baccarat Pro, Baccarat VIP, Baccarat Pro – Low, Live Baccarat Squeeze, Live Baccarat Collection, Live Speed Baccarat, No Commission Baccarat

Casino

Rating

Games#

Bonus

Guts Casino

9.5/10

1000

100% up to $100 + 50 Free Spins

Review

LeoVegas Casino

8.8/10

1000

Up to £400 in Welcome Bonus Offers + 100 Spins

Review

About the author

Stan / Casino expert

Last updated: 31 December 2021

Stan is the one that founded CorrectCasinos.com back in 2018. He is really passionate about fair-play in online casinos, transparency and responsible gaming.