Best Online Slots & Real Money Slot Games 2021


Play the best real money slots in minutes at any of the shortlisted casinos on this page. With hundreds of slot machines and progressives from top providers, these online casinos offer lucrative slots bonuses to get you started. Read on to find the best slots casinos and key tips for playing online slots for real money.

Best Casinos for Online Real Money Slots

#1 Top Rated Casino
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Gambino Slots screenshot
  • Play over 90 free casino slots
  • Huge jackpots and wins
  • Free chips every 3 hours
  • VIP club, contest and challenges
2
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WorldWinner screenshot
  • Compete against other players in exciting tournaments
  • Over $500,000 given out in prizes every day
  • Compatible with mobile devices
  • Play for free and for real money
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Big Fish Casino screenshot
  • Exciting Bonus Games
  • Unique Friend Play
  • Play Blackjack & Poker
  • Customizable Experience

The latest slots casinos on our blacklist

Every now and again, we come across a casino that we recommend you avoid playing on. We have a strict 25-step review process, looking at things like a site’s software, promotions, how easy the banking process is, security and more. When any of these steps fall below our standards, the casino is added to our blacklist.


Types of online slot machines and games

There are four main types of slot machines in online gambling. Online slots range from the classic three-reel games based on the very first slot machines to multi-payline and progressive slots that come jam-packed with innovative bonus features and ways to win. Take a look at the slot varieties below for an introduction to each one.


Three Reel Classics

Old-school slot machines, featuring the usual assortment of aces, lucky horseshoes and wild symbols. Here you need to line up three matching symbols on a single payline. Just set your coin value and away you go.

Three Reel Classics

Browse Our Full List of Slot Reviews

Want a little more information before choosing your game? Check out our slot reviews to discover one that’s right for you.

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The Best Payout Slots in 2021

The payout percentage tells you how much of your money bet will be paid out in winnings. This means you can work out how much you could win on average. For example, if a slot game payout percentage is 98.20%, the casino will on average pay out $98.20 for every $100 wagered. This is also known as Return To Player (RTP).

The following slots are ordered in terms of the highest payout percentage:


Rank Slot game RTP Read more
#1
Avalon II
97%
#2
Guns N’ Roses
96.98%
#3
Thunderstruck II
96.65%
#4
Wheel of Fortune
96.6%
#5
Mega Fortune
96.4%
#6
Starburst
96.1%
#7
Wizard of Oz
95.99%
#8
Flaming Hot
95.53%
#9
Book of Ra Deluxe
95.5%
#10
Triple Diamond
95.06%

Best online slot sites


Rank Casino Bonus Offer Number of Games Payout Speed Win Rate Play Online
#1
Gambino Slots
100K Free Coins & 200 Free Spins
-
N/A
N/A
#2
WorldWinner
$25
-
N/A
N/A
#3
Big Fish Casino
Free Chips @ Signup
-
N/A
N/A
#4
My Jackpot
Free Spins @ Signup
-
N/A
N/A
#5
Vera Vegas
Free Chips @ Signup
-
N/A
N/A
#6
Goldfish Casino
3.5M Free Chips @ Signup
120+
N/A
N/A
#7
Heart Of Vegas Slot
Free Chips @ Signup
100+
N/A
N/A
#8
Double Down Casino
Free Chips @ Signup
-
NA
N/A

What A Top Slots Casino Offers You


A Huge Range of Slots You Can Play For Fun

All the shortlisted online casinos here offer a great variety of slot machines for players to enjoy, including classic and video variations with plenty of different themes to choose from. You can expect a thrilling experience with any slots game online, with a range of top 3 reel and 5 reel titles. We look out for casinos that offer plenty of free slots, so you can spin just for fun, and great real money games if you favour the thrill of gambling.

Range of Slots

Solid Games Software That Offers Fair Games At Secure Sites

The best gambling sites will of course have games software from top developers, such as Playtech, BetSoft and Microgaming. You can be sure to find slots with great graphics and plenty of dynamic features that will run smoothly, whether it’s a desktop, iPhone or mobile device that you’re using. When you play online slots for real money, you'll want to be reassured that your money is in good hands. You can rely on our recommendations being licensed by the relevant gaming authorities, and guaranteeing a fair game using random number generators to put out those winning combinations on the reels.

Software and Security

Great Welcome Bonuses to Use on High Payout Slots

A generous welcome bonus is a must for any reputable online casino. This is particularly true when it comes to slots, so you can get in plenty of extra spins. All our top-rated sites offer excellent bonuses for a great start to your online slots experience. The games themselves all offer high payout percentages to give you the best return on your bet, and cashing out any big win is very easy with all popular banking options. If you’re a winner, you can expect any funds to be in your account within hours.

Welcome Bonuses

An All-round Great Experience Playing Slots Online

As long as the slots games deliver on all of the points noted above, the casino will be added to the shortlist here, giving players the choice of the very top casinos online. You can be sure that you'll get the best slots games and variety of titles for desktop and mobile gaming, as well as bonus rewards and handy customer support if required. We put all our recommendations through a 25-step reviews process and check them every three months to make sure they are still delivering on quality games.

4.2 /5

Meet the Games Makers

Online casinos offer an expansive range of video slot titles, many of which come from a handful of industry-leading software developers. When it comes to video slots, these guys really know their stuff. Here are some of our favorites to look out for.


  • Real Time Gaming
  • Playtech
  • Microgaming
  • Aristocrat
  • IGT
  • NETent
  • Novomatic
  • Merkur
  • NYX
  • Cryptologic
  • Belsoft

Quick Slots Strategy Tips

Online slots are entirely reliant on chance so unfortunately, there’s no secret strategy to help players win more. However, there are still things you can do to make the most out of every game.


  • Study the paytable

    Before you start playing, have a look at the paytable. Every slot game has its unique symbols and features and the paytable explains how they all work.

  • Go for smaller jackpots

    Opt for games with smaller jackpots, over massive progressive prizes. The allure of a big win is understandable but you're far more likely to be a winner this way.

  • Give the classics a try

    Simpler slot games tend to have a higher payout percentage. Sometimes it's worth sticking with the classic alternatives, even if that brand new video slot looks exciting!

  • Stick to safe sites

    Only play online slots for real money at reputable, trustworthy online casinos. If you're ever in doubt, head to Casino.org to find top rated sites.

  • Look out for bonus rounds

    Keep your eyes peeled for enticing bonus rounds. This is where you'll find free spins and jackpots and knowing your paylines means knowing your chances of winning.

Here are the Best Rated Online Slots to Play in 2021

We understand the task of picking a good slot machine can be tricky with so many options available. When trying to uncover what is the most popular slot machine, high payouts and high jackpots are always important. Titles that do this include Thunderstruck, Mega Fortune and Wizard of Oz. We have summarized our top slot picks in the table below.


Slots Strategy

Online slots are entirely reliant on chance, but that doesn’t mean there aren’t things you can do to put yourself in a better position to win. Experienced players follow a distinct strategy, like only playing games with the highest payout percentages, practicing their bonus rounds, and knowing their paylines inside and out. Follow these guides to give yourself the best possible chance to win jackpots on slot machines online.

Learn more with our game guides

Discover everything there is to know about slots with our game guides.

Real Money vs. Free Games

While free slots are great to play just for fun, many players prefer the thrill of playing real money games as it can lead to big wins. As you can see from the table below, both real money and free games come with advantages and disadvantages.


Real Money slots

Players have the opportunity to win huge sums of cash, adding a massive element of anticipation to the gameplay

Players have the opportunity to play for progressive jackpots

Real money gaming can see players lose money if they don't play responsibly

Free Games slots

Available to play instantly with no app download or sign-up required

Can be played anonymously with no need to divulge personal information or bank details

No real money can be won

Real Money slots Free Games slots

Players have the opportunity to win huge sums of cash, adding a massive element of anticipation to the gameplay

Available to play instantly with no app download or sign-up required

Players have the opportunity to play for progressive jackpots

Can be played anonymously with no need to divulge personal information or bank details

Real money gaming can see players lose money if they don't play responsibly

No real money can be won


Play Free Online Slots

At Casino.org, we have a whole host of top rated free slots from the world's most exciting online casinos, that you can play right here. These exclusive free games are available to play instantly, whether at your desk or on your mobile, as there’s no registration or requirement to download an Android or iPhone app. Play for fun, practice your strategies or use these games to test the latest releases from leading slots developers. Try your luck at the free game above to get started!

Goldfish
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Spartacus Gladiator of Rome
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Buffalo
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Mega Jackpots Wheel of Fortune on Air
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Super Monopoly Money
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Frequently Asked Questions


How do online slots work?

The basic concept of spinning the reels to match up the symbols and win is the same with online slots as it is in land based casinos. The key difference playing slots online is that the variation of games will be wider, and you'll find that most online slots offer more reels and paylines, so your chances of netting a winning combination increases.

Can I play slots for free?

Yes. Every reputable slots casino will offer players the option to play slots for free. This means you won't have to deposit any money to get started, you can simply enjoy the game for fun. Playing free online slots is a great way to get a feel for the game before you advance to wagering with real money.

What should I look for in an online slot casino?

After security and legitimacy, you want to look at the payout percentage of an online slot. The payout percentage tells you how much of your money bet will be paid out in winnings. This is especially important if you're planning on playing for real money.

What’s a progressive jackpot?

This is a jackpot that builds up over time and then pays out a big sum of money to a single player. Most online slots casinos offer progressive jackpot slots so it's worth keeping an eye on the jackpot total and how frequently the game pays out.

Can you win real money playing online slots?

Yes, you can. While online casino slots are ultimately a game of chance, many players do frequently win decent sums and some lucky ones even score life-changing payouts. If you're in it for the big bucks, progressive jackpot slots will probably suit you best.

Are online slot casinos trustworthy?

Absolutely. Provided you play at a recommended online slots casino, and avoid any blacklisted sites, your personal details and your money will stay perfectly safe online. We independently test and verify every online casino we recommend so selecting one from our list is a good place to start.

How do welcome bonuses work?

Welcome bonuses reward players when they make their first real money deposit. The exact terms and requirements vary from casino to casino and some offers that seem too good to be true probably will be. Before you commit your cash, we recommend checking the wagering requirements of the online slots casino you're planning to play at. These will explain how much of your money you're required to deposit upfront, and what you can expect to receive in return. The best bonuses will offer large payouts on minimal deposits.

Which online slots payout the most?

Progressive slots games pay out the most money, with Mega Moolah being the record breaker at €18,910,668.01. Our list of top rated online slot casinos show you the recommended games paying out real money. There are a huge variety of online casino slots paying out varying sums. These include classic three-reel slots, multi payline slots, progressive slots and video slots.

How do I pick a winning slot machine?

To try improving your chances of winning a jackpot, choose a progressive slot game with a fairly small jackpot. These games pay out most often. Another method is to pick simpler games. If a game is complex and exciting, software developers have spent more time and money to build it. This could mean frequent wins are less likely. Either way, the slot machine will still be fair and random.

Are online slots rigged?

No, all regulated online slot machines are completely fair. The results are random every time, meaning that nothing in the game is rigged. To ensure fair play, only choose slots from approved online casinos, such as those we list on this page. Playing at any of these will give you a fair chance of winning.

How do I pick a good slot machine?

You need to make sure you are playing slots with high Return to Player (RTP) percentages, advantageous bonuses, good overall ratings and a theme you appreciate. Check out our recommended slots to play in 2021 section to make the right choice for you.

What is the best online slot site?

The one that offers the biggest payouts, jackpots and bonuses along with exciting slot themes and a great player experience. To find out our top casino for this month head to our toplist.