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The Biggest Online Casinos In The World

What is the biggest of all online casinos around the world? Well, the word ‘biggest’ can mean a lot of different things in this context. Are we talking about the biggest turnover of cash? The most games? The most registered casino users? In order to find the answer to which is the largest online casino, we have taken a number of different factors into account to generate our list.

We have come up with ten of the biggest and best online casinos in the world. All of the sites listed here have an impeccable reputation for fair play and security. You will find casinos with fantastic welcome bonus offers, great selections of games and rewarding customer loyalty programmes. Read on to find out a little more about the biggest and best online casinos in the world.

888 Casino

Established in 1997, 888 Casino is one of the largest casinos operating today with a fantastic selection of slot and table games, including extensive live dealer rooms. 8 is a lucky number in many cultures, and 888 has certainly proved a lucky hunting ground for millions of players from all over the world.

Apart from offering games from providers like industry-leading NetEnt, you will find a number of custom games exclusive to this casino. There are plenty of banking options and when a casino has been in business for as long as this one you can rely on it for security.

William Hill

This British bookie has been a familiar site on the high streets of Britain for many, many years. Since moving online to open a sports book and later a casino, William Hill has expanded beyond the shores of the UK.

You will find over 400 games to choose from here, with Playtech providing the bulk of these. Fans of Playtech slots will know to expect titles like the popular Age of Gods series of games. Their jackpot slots include Jackpot Giant and Pink Panther.

Paddy Power

Paddy Power is the premier bookmaker in Ireland, and they have been online since 2004. This site is powered by Playtech and so provides a similar selection of games to William Hill. Like the British casino, once you register with the casino site you will also have access to sports betting and poker platforms with the same login details. Paddy Power has gained an army of fans around the world thanks to its innovative and sometimes controversial marketing which has kept it in the headlines.


Leo Vegas is a multi-award winning casino which offers some truly superb gaming, especially for mobile users. There is a giant selection of games available at this site including one of the best live dealer game rooms you will find anywhere in the world. Leo Vegas has proved to be the king of the casino jungle with its rewarding bonus schemes and fantastic gaming options.

Jackpot City Casino

Jackpot City has a number of games from fan-favourite Microgaming, including top slots like Terminator 2 and the record-breaking Mega Moolah jackpot game. The sign-up bonus is worth €1,600 if you take full advantage, making it one of the biggest offers around.

You will find hundreds of games to suit all tastes here, from video slots to traditional table games to video poker and live dealer titles. Jackpot City has been around since 2003, making it one of the longest running casinos still in business today, which is always a good sign.


Founded in 2000, bet365 is one of the premium brands in the world of online gambling. bet365 became famous thanks to their sportsbook – especially regarding football – but their casino offering has grown over the years in leaps and bounds. Today this Playtech powered casino is up there with the best of its type, offering a good selection of games from that brand.

These include many table gaming options plus a live dealer room. bet365 have a separate Games platform which offers a great selection of slots and other casino games from a variety of providers, and once you sign up with the casino you will have full access to these as well.

Mansion Casino

Mansion made a statement of intent in 2006 when it became a shirt sponsor for Premier League club Tottenham Hotspurs. These days it is much more than a sports betting site, as it has a thriving casino.

This is another Playtech powered casino, which means that you can expect to see a great selection of games from this popular developer. Mansion Casino offers personalised customer service and is a great option for mobile players.


While there may not be a million slot games available at this site, you will find considerably more than a thousand, making it one of the biggest operators in the industry. SlotsMillion Casino has been at the forefront of new technologies, designing the first ever virtual casino lobby for use with VR headsets.

You can also enjoy a selection of slots with your VR device, which takes you inside the games. Add in a generous welcome bonus and a great selection of other casino games and you can see why this is one of the most popular casinos around.


Casumo is a quirky little casino that has been earning rave reviews since its launch in 2012. While many new casinos sink without a trace after a couple of years, this innovative site has gone from strength to strength, picking up awards along the way.

You will find hundreds of games to choose from here, including slots, jackpots, table games and live dealer options. The real beauty of this casino is its elaborate loyalty programme which allows you to journey through different worlds, picking up rewards as you go.


Betsson is a giant Swedish casino which has been in business since 2000. This Malta-based site offers hundreds of the latest games from a wide variety of different providers. Betsson has long been regarded as a very secure and fair casino to play at. Choose from a variety of different bonus offers and enjoy excellent customer support from one of Scandinavia’s most popular online casinos.