Best Online UK Slots Sites in 2021

Slots are among the most popular casino games to date, with billions of players gambling at least once a year.

Learn about the best online UK slots, where you can find them, and how to win big!

Top 10 Best Online UK Slots Casinos

The top 10 best UK slots casinos feature the best possible combination of game variety, big UK slot bonuses, high payouts and high jackpots, rounded off with top-quality software and faultless attention to detail.

Overall Rating Play Now

Play Zee

100% up to £300 + 100 zee spins

  • #1 Best Online Slots Casino
  • Almost 2000 slots
  • 98 different slots providers
  • NetEnt Slots Jackpots
  • Search slots by provider
  • Old school slots to latest slot releases
Overall Rating Play Now

21 Casino

121% Bonus up to £300

  • #2 Best Online Slots Casino
  • Incredible 114 different slots providers
  • Bonus spins at the weekend
  • Constantly adding new slots
  • 1000+ mobile slots games
Overall Rating Play Now

Spin Rider Casino

100% up to £300 + 50 Bonus Spins

  • #3 Best Online Slots Casino
  • All top software firms
  • 31 progressive jackpots
  • High-octane design
  • 900 mobile slots games
Overall Rating Play Now

Casino Lab

100% up to £100 + 300 spins

  • #4 Best Online Slots Casino
  • Latest casino from Genesis Group
  • Use power potions to win real money
  • Accepts Paypal, Boku, Jeton, and more
Overall Rating Play Now

Betfred Casino

Stake £10 get 100 free spins

  • #5 Best Online Slots Casino
  • Top UK All-round Gambling Site
  • *New* £10 Million Betfred Blackjack
  • Free Spin Accumulator
Overall Rating Play Now

Sun Vegas

100% up to £300

  • #6 Best Online Slots Casino
  • Official casino of The Sun newspaper
  • 60+ progressive jackpot slots
  • Become a Sun VIP for exclusive rewards
Overall Rating Play Now

Casino Planet

100% up to £100 + 200 spins

  • #7 Best Online Slots Casino
  • Awesome Cyberpunk themed casino
  • Free spins weekly
  • £2,500,000 WEEKLY tournament prizes
Overall Rating Play Now

Mr Play

100% up to £50 + 100 spins

  • #8 Best Online Slots Casino
  • Fun challenges
  • Easy withdrawals
  • Thousands of games
Overall Rating Play Now

Playluck

100% bonus plus 200 extra spins

  • #9 Best Online Slots Casino
  • Bonus for first 4 deposits
  • Special offer for our visitors
  • 100+ live games selection
Overall Rating Play Now

Spinyoo

100% up to £250 + 100 Bonus Spins

  • #10 Best Online Slots Casino
  • Live Casino Challenge
  • Bonus Back Every Week
  • Daily Dose of Spins

How to Play Online UK Slots

If you are new to online slots, follow these simple steps to help get you started with your first game:

  1. First, you need to choose the online slot machine you want to play. 
  2. Once you have selected your game, launch it on your preferred device. Upon opening the game, you will see the reels, your bankroll, and some control buttons such as “spin” and “max bet.”
  3. Next, you should check the game’s paytable and see how much each symbol is worth. This way, you will know which symbols to look out for while you spin. 
  4. Before you spin, you can place your bet and select how many pay lines you’d like to play at once. If you decide to play a fast-paced game, you can use the ‘max bet’ button to play all pay lines at the same time.
  5. As soon as you’ve placed your bet, you can spin the reels and try your luck. 
  6. If you win, your winnings will be displayed and you will get the option to play a bonus game. These games can offer you extra opportunities to win prizes without wasting more spins. 
  7. Once you’ve got the hang of it, you can keep spinning and gambling, as long as your bankroll doesn’t run out!

Best Online UK Slots Features

The best online UK casinos have a variety of features you can pick from. Here’s what you should look for when picking a game of slots:

  • Bonus rounds. They can vary from simple prediction games to a more complex series that gives you extra opportunities to collect coins.
  • Free spins that allow you to make a set number of spins without eating into your pocket.
  • Scatters of special cards that can trigger events such as bonus rounds or free spins if three or more appear anywhere on the reel.
  • Cascading reels means that when you get a winning combo, you get another free spin, allowing you to keep repeating without any extra cost as long as you keep getting combos.
  • Progressive jackpots increase the value of the jackpot for as long as they are not claimed, meaning you could win very big if you just keep playing.
  • The multiplier multiplies your payout by up to 10x, depending on which symbol you get.
  • Megaways allows you to bet on multiple games at once, providing large prizes.
  • Wilds are common symbols that can complete any combination you spin, which then allows you to take home the jackpot, unlock special prizes, or trigger other features.

Why Play Slots Online

If you’re looking for reasons to get into slots, here are some of the top benefits to help you make up your mind.

Online slots:

  • Are easy to play. You can access the online casinos from anywhere and don’t have to wait for a free machine. 
  • Have a wide range of games. The best online UK slots casinos provide so many slots that you’ll never run out of new games to try. 
  • Host slot tournaments. If you’re looking for larger payouts along with some competitive fun, online casinos host slots tournaments that you can easily join in on. 
  • Offer many rewards and incentives. Enjoy bonuses and rewards through welcome bonuses, free spins, or bonus rounds. 
  • Are easy to make deposits for. You can usually make your deposits using Neteller, credit cards, debit cards, or PayPal.
  • Offer bigger payouts. Since online casinos have fewer overheads, you can usually expect around 92-97% returns, giving them the edge over land-based casinos. 
  • Have games available on-demand. No more waiting for a machine to free up. Online slots can be played by multiple players at once. 

Offer flexible stakes. The best online UK slots offer you the option to wager as little as a few pence or as much as thousands of pounds.

Best UK Online Slots – Free Slots & Online Slots Reviews

Check this list of some of the best UK online slots. All of the UK slot games listed below come with reviews and free demo modes. Give them a try before you play online slots for real money!

Why You Should Read Online Slots Reviews

Playing safely is one of the great reasons to read online slots reviews. Sites that are genuine scams are few and far between. And they don’t last long because word soon spreads. So a review of a casino site is a great sign that it’s passed a minimum lifespan and can be regarded as legitimate.

When it comes to games, a slot review should give you good information. A good look at the pay-table and a good walk-through of the rules is the last you should expect.

We always say this: forewarned is forearmed, and a player who knows their way around a game is much less likely to make bad decisions.

What Makes a Good Online UK Slots Casino Stand Out

There are now hundreds of slot casinos UK online gambling fans can choose from. It’s no easy task to sort the wheat from the chaff. While it’s getting more and more difficult to get scammed online, the multiplicity of options can leave players scratching their heads and constantly browsing for new sites.

So, what makes a good slots casino stand out?

#1. Safety Features

Forget everything if a site isn’t safe to gamble on. You want to see a valid, up-to-date UK Gambling Commission license, or you should hit the back button faster than you hit the collect button after a big win.

You can be picky if you want because some quite big names have endorsements on their licenses for dodgy behavior of one sort or another. Not many sites are bad enough to lose their license, but if you want to be completely sure, look for clean licenses.

#2. Selection of Games

Do you have an idea of how many new slots are released each month? We don’t, and we’re slots are our expertise! There are simply too many games to keep up with, so you should do some research and pick your favorites.

A good way to do this is to follow developers you like; big names like NetEnt slots and Microgaming, but also innovative designers like Thunderkick. You want to see your old favorites, plus a good supply of new titles.

#3. Welcome Bonuses

We ask players to be wary of bonuses. They have a lot of restrictions on them and we’d urge every single slot player to rest upon and fully understand what a big welcome bonus actually means. But once you’ve got your head around them you should absolutely play the system for all that it’s worth. We don’t think you’re likely to get rich off bonus cash, but you can certainly save yourself money by using bonuses and free spins to try out new online slots.

#4. Social Life

Slots are kind of a solitary pursuit. How about finding a social aspect to your gaming? A lot of the best sites have lively social media sites where you might meet your fellow players. And some promotions – like tournaments or team games – also have a social aspect. If you want to lose some of the loneliness of the long-distance slot player then look for a slots casino with a good social aspect!

Types of Games Among the Best Online UK Slots Casinos

There are many different types of games you’ll find among the best online UK slots. Some of them include:

#1. Three-Reel Slots

Three-Reel Slots are the most basic type of slot game. You’ll see three columns and three rows of symbols in a window, with the center row being the pay line. You receive a return if the symbols on the reel match up with any of the symbols displayed on the pay line.

#2. Five-Reel Slots

Five-Reel slots can have up to 100 pay lines, making this game of slots far more complicated than the three-reel version! This means you have far more winning combinations and chances to win with each spin. You also get extra bonuses like wilds and scatter symbols with five-reel-slots, which also increases your winning potential. 

#3. 3D Slots

These slots are almost exactly the same as video slots, only they have 3D animations and characters you can interact with. These games tend to have a story-telling element for a more immersive and exciting gaming experience.

#4. Video Slots

It seems odd to talk about video slots because really every online slot is an online video slot. That is, they use some sort of moving images to represent the reels rather than actual mechanical reels. The technology used to do this today is usually HTML5, JavaScript, or Flash.

#5. Fruit Slots

Fruit seems to be an odd mix with gambling. In fact, it was a trick used in order to make early slot machines not look like gambling games. These crafty slot machine owners continued to rake in cash, but the police were left scratching their heads trying to stop simulations of card games being played. And fruit symbols still hold a place in the heart of slot players today.

#6. Slots with Progressive Jackpots

These types slots give you the chance to receive potentially huge returns. This is because when a player loses a bet, the money is added to the collective jackpot pool. This means that if you win, the jackpot could even be millions, depending on how many players are taking part in the same progressive jackpot game.

#7. I-Slots

I-Slots are the modern solution for players who enjoy online video games. Like the 3D slots, this type of slot game includes storylines, although in this case, the players can create their own story depending on which combinations they spin.

What is RTP in Online Slots

A Return to Player (RTP), which is usually displayed as a percentage, is the return rate of all wagered money that a slot machine will give out to players.

The higher the percentage, the more likely you are to see a higher return. So, for example, if the RTP is 97%, the slot machine gives back £97 for every £100 it receives.

The best online UK slots have an RTP of at least 95%, but the RTP can never be 100% as it would not be profitable for the casino.

The RTP is calculated by dividing all money the slots have paid out to players with all money the slots have wagered. For a more accurate representation, this is calculated using data from a large number of spins (usually at least 1 million).

The Best Online UK Slots Software Providers

There are many software providers currently out there—some are well established and with a lot of experience, while most are new, up-and-coming startups. While there are many promising new developers, we recommend sticking with the tried and tested giants that have the experience and resources to regularly deliver the highest quality games.

Here are some of the top slots providers on the market:

Best Online UK High Payout Slots

If you’re looking for the highest payout online UK slots, here are our top picks:

Overall Rating Play Now

Play Zee

100% up to £300 + 100 zee spins

  • #1 Best Online UK High Payout Slots
  • Almost 2000 slots
  • 98 different slots providers
  • NetEnt Slots Jackpots
  • Search slots by provider
  • 97.12% RTP (Genie Megaways)
Overall Rating Play Now

Spin Rider Casino

100% up to £300 + 50 Bonus Spins

  • #2 Best Online UK High Payout Slots
  • All top software firms
  • 31 progressive jackpots
  • High-octane design
  • 900 mobile slots games
  • 97.87% RTP (Big Bounty Bill)
Overall Rating Play Now

21 Casino

121% Bonus up to £300

  • #3 Best Online UK High Payout Slots
  • Incredible 114 different slots providers
  • Bonus spins at the weekend
  • Constantly adding new slots
  • 1000+ mobile slots games
  • 97.4% RTP (Big Bad Wolf)

Best Mobile Slots Sites in the UK

The best online UK slots can be played from almost any device, including mobile phones. On mobile, you can either download the casino app or play directly on the browser.

Here are some of the most mobile-friendly slots sites in the UK:

Overall Rating Play Now

Betfred Casino

Stake £10 get 100 free spins

  • #1 Best UK Mobile Slots
  • Top UK All-round Gambling Site
  • *New* £10 Million Betfred Blackjack
  • Free Spin Accumulator
  • 500 mobile slots
Overall Rating Play Now

Sun Vegas

100% up to £300

  • #2 Best UK Mobile Slots
  • Official casino of The Sun newspaper
  • 60+ progressive jackpot slots
  • Become a Sun VIP for exclusive rewards
  • 600+ mobile slots
Overall Rating Play Now

Casino Lab

100% up to £100 + 300 spins

  • #3 Best UK Mobile Slots
  • Latest casino from Genesis Group
  • Use power potions to win real money
  • Accepts Paypal, Boku, Jeton, and more
  • 1200+ mobile slots

Online Slots Strategy: How to Win on Slot Machines

We’ll make this short and sweet.

There is no online slots strategy that will help you win on slot machines. Anyone who tells you that they have such a strategy is a liar and a scammer and you should get away from them without giving them any money!

Historically, there was an outside chance that a very skilled observer, or someone who broke the law in order to get at the internal workings of a mechanical machine, might work out when a machine was more likely to pay out.

This is no longer possible.

So the best way to play online slots is to play them safely, legally, and sensibly.

Always play at licensed sites with a current UK Gambling Commission licence. Always play at sites you trust and that look legit.

And play safely – for fun, for limited amounts of time, and with genuine limits on what you spend.

Enjoy!

What are Online Slots Tournaments

Taking part in an online slots tournament is kind of like playing competitive sports. It’s fast-paced and provides the thrill of winning.

To participate in one of these tournaments, you’ll first have to sign up at your favorite online casino site. There will likely be an entrance fee but, in return, you won’t have to pay for spins.

Not only are these tournaments great fun, but having a social side to them also adds a new and healthy dimension to your gaming experience. Some of the best online UK slots casinos – Videoslots, for example – even feature battle slot tournaments as one of their main attractions, with hourly slot battles across a variety of slot games, featuring some large payouts and jackpots.

Keep in mind, however, that tournaments are time-limited and a good way for casinos to plug new, or perhaps underperforming machines. So, make sure to always read the rules and know exactly what to expect.

Online UK Slots Payment Methods 

The best online UK slots sites offer a wide variety of payment methods to make depositing money on players’ accounts quicker and more convenient. For most casinos you can make deposits using:

  • Debit cards
  • Electronic Wallets like PayPal, Skrill, and Neteller
  • Bank or wire transfers
  • Prepaid cards such as Paysafecard and Entropay
  • Mobile payment methods like Boku or Apple Pay

Best Online UK Slots FAQ

This Q&A will get you started in the exciting area of online casino slots and tell you how to play online slots safely and sustainably.

#1. What are online slots?

Slot games are a form of gambling based on cards. The games were first conceived as a way to automate poker. The deal became a spin.

The games you play today online work in a very similar way and with similar basic probabilities governing the outcomes of these games. Players stake an amount of money on the spin and they are rewarded for unusual sets of symbols.

#2. Can you win real money when playing online slots?

Yes, though many online casinos do offer slots for practice or just for fun that do not win you any real money, you can bet and win real money playing any of the best online UK slots on our list.

#3. Are online slots safe to play?

Playing on some of the best online UK Slot sites is totally safe. In the UK, you must use a site that is licensed by the UK Gambling Commission in order to play slots legally for real money. This license should be displayed on the front page of the site and you’ll be doing yourself a favor if you click to check if it is legitimate.

#4. What are the rules of online slots?

Before you start any slot game, always make sure you understand the rules. So click on that pay-table button and do some reading. However, remember that slot games work in a very simple way. Almost all of them can be understood in terms of a couple of controls – a spin button and a button to set the amount you’re betting.

#5. Why can’t I play free online slots in the UK?

You can play online slots for free but, of course, you can’t win any real money that way. Free slots are available for players who want to get familiar with the different types of games, or just want to play for fun and without any real betting involved.

#6. What is a slot RNG (random number generator) and how does it work?

A random number generator (RNG) is used to make slot games fair and luck-based. In order to determine whether the player wins or loses, a slot machine generates a random number between 0 and 100. Any number above 55 is considered a win, while any number below is a loss, giving the house a slight advantage.

#7. How do I keep my betting safe on online slots?

Before you start to gamble with slots, we advise you to do some reading on safer gambling.

There are lots of great tricks out there to help you stay financially safe when you play any online gambling game. The best online slot sites in the UK will not only give you good advice but a number of tools that you can use to help keep you safe, too. Actually, they are legally required to provide some of them, so keep an eye out.

Learn how to set a limit on your spending and the time you spend at a site. Learn how to exclude yourself from a site if you feel you’re spending too much. Best of all, learn how to spot problem behaviors and how to reach out for help. That’s the best thing you can do before you play a single online slot.

#8. Are all British online casinos legit?

Most online UK casinos are safe and legit. However, there are always some scammers looking to steal unsuspecting people’s money online. You can always tell which ones are legit by making sure the casino is licensed by the UK Gambling Commission.

#9. What are classic online slots and video slots?

The best online UK Slots come in every shape, size, and colour these days and are divided into broad categories. The two most popular are classic slots and video slots.

Classic slots borrow their gameplay and aesthetic cues from old-style games. They are likely to have fewer reels (sometimes as few as three), and their symbols usually come from a set of established icons like fruits, 7s, bells, and bars.

Video slots can broadly be described as “everything else” and generally have sophisticated gameplay and imagery.

#10. How do I find the best online slots sites?

There are hundreds of companies making slots these days, with a few main players dominating the industry.

The biggest slot companies, like SG, NetEnt, and Microgaming, now own many smaller design studios that produce titles for them.

The best online UK slots site will have a range of games from different producers and will allow you to search or filter games by their developer so you can follow your favorites.

#11. Where can I find the newest UK online slots?

All of the best online UK slots sites regularly update their slots menus so that their customers always have the best and newest games available at all times.