Biggest Online Casinos

Biggest Online Casinos

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The biggest online casinos in the world are websites with the largest online casino libraries, diverse selection of available banking methods and an extensive list of casino game providers.  Best Casinos has prepared a list of biggest casino sites in the world which includes operators offering 2,000+ casino games. 

Large casino sites accept millions of players worldwide. Big operators offer the best casino games from top-rated software providers and small-scale developers. The largest casinos online also have extensive bonus offers, including top Welcome Bonuses. This page is dedicated to finding the biggest and best online casinos. investigates gambling websites with the largest portfolios from major software companies. We use content, banking options, Customer Service, and bonuses as critical factors for the best gambling sites on the internet. The greatest operators are both the largest casinos in the world and the best online casinos sites for gambling entertainment. To find the greatest online casino sites, read guide for the biggest online casino websites.

While smaller casinos do have their advantages, the largest online casino websites are known for consistently offering players an unbeatable online casino gaming experience. For players seeking out the biggest casinos in the world, their search stops here with  We present a comprehensive list of biggest casino websites with at least 500 online casino games in their portfolios.

While choosing an online casino to play at, players usually take into consideration several important factors. Those include bonus offers, licensing and ownership, customer support, and banking details. They also spend a lot of time researching the casino’s software and game portfolio. To avoid ending up in a limited portfolio site, punters should register at the biggest online casino in the world.

The biggest international online casino sites also offer the largest number of games. Besides slots, their libraries include table and card games, video poker, specialty games, and instant play. Of course, there are the popular pastimes like lottery games, scratch cards, and keno and craps. In other words, large online casinos have something for everybody, irrespective of the size of their bankroll, gaming taste, age, and gender.

Since most large online casinos use the latest HTML5 technology, you can use a wide range of devices to access. They are fully accessible via Mac computers, PCs, smartphones, and tablets. Players do not have to download any casino gaming software.

All they need to do is create an account and enjoy. Once they join, they can play games, claim bonuses, and partake in the promotions on any device under the sun.

9 Biggest Online Casinos FOUND
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Up to €300 Welcome Bonus + 100 Free Spins
* New Customer Offer. T&C's Apply. 18+. Please Gamble Responsibly.
Target Markets: Canada, Europe, Finland, Germany, International, Netherlands, Norway, Sweden Software: Betsoft, Big Time Gaming, Evolution, Genii
, GiG Games, Microgaming, NetEnt, Nolimit City, NYX, Play'n Go, Pragmatic Play, Quickspin, Red Tiger, Yggdrasil Games: 1,100+ Cash Out Time: 12 hours
Truckload of casino games from respectable developers. Hassle-free and faster payouts. Proactive and intelligent customer support.
Get €100 Bonus + 200 Free Spins
* New Customer Offer. T&C's Apply. 18+. Please Gamble Responsibly.
Target Markets: Canada, Europe, Finland, Germany, International, Netherlands, Sweden, United Kingdom Software: 4ThePlayer, Betsoft, Big Time Gaming, Elk Studios, Evolution, Ezugi, IGT, Merkur Gaming, Microgaming, NetEnt, Next Generation, Nolimit City, NYX, Play'n Go, Pragmatic Play, Quickspin, Red Tiger, WMS, Yggdrasil Games: 2,500+ Cash Out Time: 12 hours
Award-winning gambling venue. Extensive offering of casino games. Top-quality live dealer - 80+ titles. Engaging bonuses. Fast withdrawals.
£100 Cash + 20 Wager-Free Spins
* New Customer Offer. T&C's Apply. 18+. Please Gamble Responsibly.
Target Markets: Canada, Denmark, Europe, Finland, Germany, India, International, Ireland, Nigeria, Norway, Pakistan, Singapore, Sweden, United Kingdom Software: Betsoft, Big Time Gaming, Blueprint, Elk Studios, Evolution, Ezugi, Genesis, Genii
, iSoftBet, Microgaming, NetEnt, Nolimit City, Novomatic, NYX, Play'n Go, Playtech, Pragmatic Play, Quickspin, Red Tiger, Thunderkick, WMS, Yggdrasil Games: 2,500+ Cash Out Time: 12 hours
King of mobile casino. Award-winning gambling venue. Slick, easy-to-navigate interface. Impressive array of casino games. Top-notch live dealer.
100% up to €200 Sign-up Bonus
* New Customer Offer. T&C's Apply. 18+. Please Gamble Responsibly.
Target Markets: Africa, Canada, Denmark, Finland, Ireland, New Zealand, Norway, Russia, Sweden, United Kingdom Software: 1x2Gaming, Aristocrat, Betsoft, Big Time Gaming, Blueprint, Cryptologic, EGT, Elk Studios, Endorphina, Evolution, Habanero, IGT, iSoftBet, Leander, Merkur Gaming, Microgaming, NetEnt, Next Generation, Nolimit City, NYX, Play'n Go, Playtech, Pragmatic Play, Quickspin, Red Tiger, Rival, Thunderkick, WMS, Yggdrasil Games: 5,360+ Cash Out Time: 12 hours
World’s largest slots casino. Huge jackpots. Generous deposit bonuses. Free cash giveaways. 5,360+ casino games.
100% up to €200 Welcome Bonus
* New Customer Offer. T&C's Apply. 18+. Please Gamble Responsibly.
Target Markets: Canada, Finland, Germany, Netherlands, New Zealand, Norway, Sweden, United Kingdom Software: Betsoft, Big Time Gaming, Blueprint, Evolution, Genii
, GiG Games, IGT, Microgaming, NetEnt, Nolimit City, NYX, Play'n Go, Pragmatic Play, Quickspin, Thunderkick, Yggdrasil Games: 2,500+ Cash Out Time: 12 hours
Innovative, user-driven interface. Unique gaming experience. Instant rewards & low wagering requirements. High-quality casino games.
100% up to £300 Sign-Up Bonus
* New Customer Offer. T&C's Apply. 18+. Please Gamble Responsibly.
Target Markets: Africa, Asia, Canada, Europe, Finland, Germany, Sweden, United Kingdom Software: 4ThePlayer, Big Time Gaming, Evolution, Microgaming, Nolimit City, NYX, Playtech, Pragmatic Play, Yggdrasil Games: 2,600+ Cash Out Time: 12 hours
Long-standing reputation. Slots, table games, card games, jackpots, live dealer. William Hill Macau. Impressive bonuses & promotions.
Up to €1200 Bonus + 200 Free Spins
* New Customer Offer. T&C's Apply. 18+. Please Gamble Responsibly.
Target Markets: Canada, Europe, Finland, Germany, International, Netherlands, New Zealand, Norway, Sweden, United Kingdom Software: 4ThePlayer, Big Time Gaming, Elk Studios, Evolution, IGT, Leander, Merkur Gaming, Microgaming, NetEnt, Nolimit City, Novomatic, NYX, Play'n Go, Playtech, Pragmatic Play, Quickspin, Thunderkick, WMS, Yggdrasil Games: 2,800+ Cash Out Time: 12 hours
Wide selection of casino games. Completely instant-play casino. Impressive offering of innovative slots. Unique adventure promotions.
100% up to £100 Deposit Bonus + 50 Free Spins
* New Customer Offer. T&C's Apply. 18+. Please Gamble Responsibly.
Target Markets: Canada, Finland, Germany, Norway, South Africa, Sweden, United Kingdom Software: Aristocrat, Betsoft, Evolution, Microgaming, NetEnt, Next Generation, NYX, Play'n Go, Quickspin Games: 2,100+ Cash Out Time: 24 hours
2,100+ different games available. Top-notch live dealer casino. Impressive welcome bonus. Free-to-play casino games. Fast deposit and withdrawals.
$1500 Signup Bonus & 300 Free Spins
* New Customer Offer. T&C's Apply. 18+. Please Gamble Responsibly.
Target Markets: Canada, Germany, Norway, Sweden, United Kingdom Software: Evolution, Microgaming, NetEnt, NYX, Play'n Go, Quickspin, Yggdrasil Games: 1,400+ Cash Out Time: 12 hours
Over 1,400 different casino games from industry giants, premium gaming experience. Free spins, casino bonuses. Mobile compatible.

Online Casinos with the Most Casino Games

What is the biggest online casino in the world?

This is is a question easy to ask and tricky to answer.

That is why we have deployed an army of online casino experts. Their mission is to check and examine a great number of online gambling venues. Afterwards, their task revolved around reviewing these handpicked largest online casinos based on numerous, strict criteria.

Before we could display a venue on the website, we had to check the licences, Customer Support, banking methods, and content. We had to make sure each venue sported the most popular online casino slots and sought-after titles.

It took a lot of time, effort and dedication to compile relevant standards and lists before unveiling the best online casinos before you. We at choose only the most distinguished and finest casino sites for our readers. Our biggest online casino recommendations are honest and unbiased.

Discovering the biggest online casinos in Europe & World is time-consuming and requires dedication. For impatient players, here is a list of what we deem the best and biggest casino sites in different categories:

The Best & Biggest Online Casino Sites in the World

1.       Guts (Best for Casino Bonuses) 2.       William Hill (Best Casino for UK)
3.       Mr. Green (Best Casino for Reliability) 4.        Casumo (Best for Fast Withdrawals)
5.       LeoVegas (Best Mobile Casino) 6.       Play OJO (Best for High-Quality Games)
7.       VipSlots (Best Casino for Slot Promos) 8.       Sloty (Best Casino for Online Slots)
9.       Rizk (Best Casino for Roulette) 10.   1xBet (Best for Live Dealer Casino Games)

We want you to have the most quality casino content, so we have done all the heavy lifting instead of you.  What follows is a compilation of key touchstones which we considered in the process of finding the largest online casinos in the world.

Casino Licensing & Security

The aspect you need to look at before all others!

Legitimate online casinos are checked above all based on their licenses. So we need to address the elephant in the room immediately.

Having at least a couple of distinguished regulatory bodies makes a good online casino. But having 3+ strict supervisory organs is optimal for the biggest online casinos.

The most reputable and rigid monitory firms are the UK Gambling Commission (UKGC), the Malta Gaming Authority (MGA), Gibraltar Betting and Gaming Association (GBGA), and the Swedish Gambling Authority (Spelinspektionen). There are many others like Alderney, Ireland and Curacao, but the above are known as the definition of strictness. Only the largest online casinos possess their licences.

You can check every online casino’s licensors on the bottom of the homepage. Simply scroll down and you will see the stamps of approval.

What’s more, the best international online casino site takes care of your safety through other means of protection. One of the precautionary measures is the utilisation of the SSL protocols. Secure Socket Layer encryption makes sure all your financial transactions are intact.

They safeguard your deposit/withdrawal request by establishing a secure connection between you and the operator.

Likewise, a reliable and trustworthy online casino website posts its audits for the public to see. Some of the most eminent agencies are eCogra and TST. These independent auditing bodies check the regulation of all activity at the casino premises.

Moving on to the main part of the list, here is a visual representation of what we deem crucial in the process of recognising the world’s largest online casinos:

How to Recognise Big Casinos Online

Multi Software Casinos

All the biggest casino companies know that it’s important to have a plethora of casino suppliers by their side. Sure, sticking with one slot provider can be a good tactic for some casino operators. However, it is usually favourable to boast at least several developers support the content library.

The main reason behind this logic is the diversity of styles. While players usually prefer a particular kind of visuals, they like to shift to others from time to time. You might be into fantasy slots, but you can get tired of them. Perhaps then you’d like to give branded video slots a shot. Or animal games might be up your alley. At the end of the day, it is good to have a choice.

From a technical point of view, the gameplay and mechanics of those titles should be user-friendly. What we mean by this above all is a solid payout percentage (RTP). RTP is the Return to Player.

For information about the highest-paying slots from various providers, check out our top RTP online slots lists:

Additionally, it’s also nice to check out different approaches to the same theme.

Therefore, you can play Asian or Egyptian slots from Realtime Gaming (RTG), NetEnt, Play’n GO or Microgaming. And it’s just one instance. You can experiment with a litany of titles if your favourite online casino partners with multiple manufacturers.

Lastly, let’s not forget jackpots. Progressives are a burning topic, especially among high-limit players. They take some time to accumulate, but when they do, they pay out immensely. Progressive jackpots are made for patient players. Big online casinos should offer at least a dozen jackpots.

Biggest Online Casino Boasts Rich Slots & Casino Games Lobby

We are not concerned only with slots. We at are aware that some players might be fonder of table and card games, as well as live dealer tables. Besides hundreds of diverse releases, a top online casino will boast a display of Roulette and Blackjack variants. Baccarat, Sic Bo, Keno, Craps and video poker should also be members of the team.

The same rules apply to live casino. A live dealer lounge is an ever-welcome guest at all top online casinos. In today’s fast-paced world, few people have time to go to a physical casino. Instead, they seek an ultra-lifelike, authentic live gambling experience from home.

At the largest online gambling venues, players can play Live Roulette, Live Blackjack and Live Baccarat, to mention a few. Big software suppliers like Evolution Gaming, NetEnt and Playtech are the most famous and prolific live dealer providers.

Top 5 Biggest Casinos in the World

Web-based operators have been steadily growing their libraries over the years thanks to the increase of popularity of such games. Today, digital gambling is one of the favourite pastimes of numerous online punters – and they all enjoy thousands of modern casino titles.

But certain venues stand out from the rest. Their defining characteristics might include unique designs, a charming backstory, or even special payment methods. But our favourite characteristic is a massive portfolio with thousands of games. And here these five venues come into play.

Below is a list of five casinos with the largest content offers on the internet. We have no doubts that you are quite familiar with them, especially with the top-rated biggest casino in the world.














William Hill



Mr Green


Videoslots passed its 4,000th game mark long ago, and is slowly building towards its 5,000-title target. We are confident we will not have to wait long before the operator reaches it – as it gets content from the biggest casino companies around the globe!

Moreover, the rest of the venues are to follow suit, enriching their offers and filling their lobbies with premium-quality titles and releases every day.

Helpful Customer Service

A frequently overlooked factor of a successful online casino is a good customer support team. But what does “good” in this context mean? To start with, the client service team should be available 24/7.

In other words, you get an around-the-clock service, and approachability at all times. So, if an online casino’s customer service operates 24 hours a day, 7 days a week, it’s already a good start.

Besides, various communication methods are also typical of a big online casino. The most popular option right now is Live Chat. The live facility is hot with players because it provides instant help and is hassle-free. It is simple and quick, and it solves issues immediately. Furthermore, the second most popular support option is the phone.

The biggest online casinos offer its international players toll-free phone numbers. Moving on, every online gaming brand should cater to an e-mail service. Some players prefer written correspondence. A comprehensive FAQ section is always welcome, as well as an online enquiry form. The latter is available directly on the website; all you need to do is fill it out with required info.

Biggest Casinos Offers Attractive Promotions

Let’s be honest, promotions and bonuses are what first attract your attention when checking out a casino.

How cool is it to see that the casino you are considering offers a no deposit bonus?

That means you just need to sign up and you’ll have free cash to spend on your favourite games! There are also first and second deposit bonuses at hand. All of these are reserved for new customers only.

Nevertheless, existing clients are not left hanging. As a regular player at a big casino, you can benefit from daily deals and exclusive promotions.

Daily promotions are hosted by a big number of casinos. They have a special deal surrounding a specific game or banking method on a particular day. Here on this website, you can find a definitive list of the best daily deals in the industry. You can play any day of the week and get free stuff, such as comp points.

On the other hand, some casinos are keener on short-lived campaigns that are announced from time to time. Luckily, professionals keep their eyes peeled and post the ongoing promos regularly.

So, a big online casino has to have attractive promotions and bonuses.

Numerous Banking Methods Available at Biggest Online Casino Websites

The next thing on our list concerns finances. A necessary part of your real money online casino journey is banking. To gamble for real money, you have to have a means of financial transactions. It depends on a few criteria which one would suit you, and your casino of choice should offer it.

At the time of writing, the most popular payment method is an e-wallet. With this banking option, you get fast and easy transfers where additional costs don’t ensue.

Great examples of popular e-wallets options in online gambling are:

Apart from electronic wallets, mobile payment options are also quite popular. The most popular mobile casino payment options are:

Moreover, having a selection of prepaid vouchers and various bank transfers is a green light for a large casino.

Finally, you’d likely want your online casino to let you utilise your preferred currency. In addition to traditional national currencies, nowadays the biggest casinos accept cryptocurrencies like Bitcoin and Ethereum.

Biggest Online Casino Sites & Device Optimisation

Last, but certainly not least, is the technical adaptability of the casino. Every self-respecting online casino boasts optimised performance across all platforms.

Times have changed over the years and fewer players use the desktop version. The world has gotten faster and most people don’t have the time to sit down before a computer. Instead, they like to enjoy a mobile casino, be it on an Apple or Android phone.

A modern player likes to be able to play on the go. Therefore, all the biggest online casinos in the world are mobile-friendly. That means easily accessed on smartphones, tablets and Blackberry phones.

In most cases, you are not required to download any software. You can simply load the homepage of the casino in your mobile browser.

And those are the basic things which make an online casino good and big.

Reasons for the Popularity of Big Online Casinos

Let’s sum up what makes the biggest online casinos on the planet. The most trusted online casino will have a checklist that at all times needs to be complete.

First and foremost is safety. This regards the likes of licensing, encryption protocols and auditing services. Second, is the partnership with numerous, industry-leading software providers. As a result, the third factor comes, which is an ample selection of diverse games. This portfolio should encompass classic and video slots, table and card games, jackpots, live casino tables and speciality titles.

Next up is banking. A plethora of diverse payment methods should be at your disposal always. In times of wonder, a good customer service team should be at hand. A helpful agent of a big casino will pick up the phone 24/7, and answer your queries round the clock.

Taking walk on the fun side, it’s always great to see a fine selection of rewarding promotions and bonuses. Ultimately, everything above-mentioned should be available on mobile, as well.

So, it all comes down to these 7 factors that make the biggest online casino in the world.

Frequently Asked Questions
Do casinos with massive lobbies have no deposit bonus offers?

No deposit bonus offers are a popular form of promotions on gaming websites. Punters enjoy using such deals when they first enter the casino. As you know, this is a deal reserved for newcomers – and the biggest online casinos do enjoy accommodating their potential customers. So, yes – the biggest online casinos in the world do offer no deposit bonuses and promotions.

What is the biggest online casino in the world?

In terms of content, Videoslots is the biggest casino in the world. This web-based operator boasts one of the biggest content libraries on the internet. However, in terms of outreach and market presence, it is 888. This brand is present on all continents, with business operations in most countries. So, depending on the form of the question, we could say that both Videoslots and 888 are the biggest online casinos in the world.

What are the benefits of playing in a big online casino?

Besides having a massive portfolio with thousands of games at your disposal, there are many benefits to joining biggest casinos online. They are hubs where you can find popular online casino slots, exclusive tables, limited-edition promos, and special boosters. Moreover, they are certifiably safe to join, as strict licencing ensures they perform their duties with care about their customers.

Are the biggest casinos available in all countries?

No, the biggest operators are not available in all countries. Web-based operators depend on the gambling laws in each state, and laws are different in each country. So, they are present only in those markets that which they’ve acquired licences from international regulatory bodies. You can check which countries are restricted with each venue which we rated and reviewed.

What is the best and biggest online casino in the UK?

Videoslots, the biggest online casino in the world, caters to UK players as well. What is more, the UK is one of the operator’s main targets, so there are always exclusive offers for players from that region. You can check which other venues with impressive libraries offer their services to players from the UK on our corresponding page.