Best Online Slots Casinos UK

Compare the best online slots casinos in the UK and read our comprehensive online slots guide below.

Written by Steven Hubbard
Verified by BettingGuide team
Last updated 03/01/2024

Top 13 UK Online Slots Casinos (2024)

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50 Free Spins + 100% Deposit Match Bonus Up To £100
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  • Wager Free Spins, T&Cs apply. New reg only. Opt in & deposit £10, £25 or £50 within 7 days & further 7 days to wager cash stakes 35x to unlock reward (£50 on 2 deposits). 3 day exp. Wagering/game contributions vary. 25 wager-free spins x10p to added to Big Bass Splash with each qualifying deposit, 3 day expiry.
Stake £10 Get 100 Free Spins on Big Bass Bonanza
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*New UK customers only. 100 free spins on Big Bass Bonanza (£0.10 per spin) credited after a successful £10 deposit and £10 stake on Casino, Vegas or Live. No wagering requirements on free spin winnings. Debit Card deposit only (exclusions apply). This offer is valid 7 days from the new account being registered. 18+ Bet the Responsible Way. Full terms apply.
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  • 500+ Casino Games
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New customers only. Opt In required. £/€10 min stake on Casino slots within 30 days of registration. Max bonus 200 Free Spins on selected games credited within 48 hours. Free Spins expire after 7 days. iOS app restrictions may apply. Email/SMS validation may apply. Not available in NI. Full T&Cs apply.
Grab up to 200 Cash Free Spins on Book of Dead (No Wagering)
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18+ new customers only. £/€20 stake on slots each day within 5 days of 1st deposit to qualify. £0.1 Spins on Book of Dead. £/€250 total max withdrawal. Full T&Cs apply
Zodiac Casino
Stake £1 Get 80 Free Spins
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  • 550+ Games
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Welcome Offer is for New Customers Only. The 80 chances are credited as £20 welcome bonus and players can spin 80 times at £0.25 on the Mega Moolah progressive slot game. The minimum first deposit required is £1, for all subsequent deposits the minimum deposit is £10. A two hundred times wagering requirement applies on all bonuses and certain games contribute a different percentage to the wagering requirement.
Pokerstars casino
100 Free Spins No Deposit + Bet £20 Get £200
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New casino players only. Min. deposit £20 with code ‘FIRST200’. Debit card (Visa or Mastercard) only. Selected Slots only, 7 day expiry. Wagering requirements apply, 5 redemption points per £1 to clear bonus. Game contributions vary. Maximum bet £5 per round. Terms apply. 18+ Play responsibly.
Bet £10 Get 20 Wager Free Spins
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New customer offer. Minimum deposit £10. Gamble Responsibly. T&C's Apply 18+
Get 50 Free Spins on 1st Deposit (Wager Free)
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First deposit only. 50 Free Spins on the Book of Dead slot. Minimum deposit £10. Each Free Spin valued at 10p.OJO’s Rewards and Game Play policy applies.
Yukon Gold Casino
Deposit £10 get 125 Free Spins
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The minimum deposit is £10. The 125 chances are credited as £37.50 welcome bonus and players can spin 125 times at £0.30. A two hundred times wagering requirement applies on all bonuses and certain games contribute a different percentage to the wagering requirement.
Grand Mondial
Stake £10 Get 150 Free Spins on Massive Jackpots
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Welcome offer for new customers only. The minimum deposit is £10. The 150 chances are credited as £37.50 welcome bonus and players can spin 150 times at £0.25 on the mega moolah Progressive slot game. A two hundred times wagering requirement applies on all bonuses and certain games contribute a different percentage to the wagering requirements
Quatro Casino
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Spins must be played on day of allocation. In the event that the player fails to log into their casino account, or does not play the spins on the day of allocation, the spins will be forfeited on that individual day. Winnings from spins are credited to the casino account in bonus money. A two hundred times wagering requirement applies on all bonuses and on any winnings from the spins. Certain games contribute a different percentage to the wagering requirement.
Golden Tiger
Welcome Bonuses up to £1500
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The minimum deposit is £10. A two hundred times wagering requirement applies on all bonuses and certain games contribute a different percentage to the wagering requirement.
Captain Cooks Casino
Stake £5 Get 100 Free Spins
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Welcome Offer Is For New Customers Only. The Minimum First Deposit Required Is £5, For All Subsequent Deposits The Minimum Deposit Is £10. The 100 Chances Are Credited As A £25 Bonus And Players Can Wager 100 Times At £0.25 On The Mega Moolah Slot Machines. A Two Hundred Times Wagering Requirement Applies On All Bonuses And Certain Games Contribute A Different Percentage To The Wagering Requirement.

Best Online Slots in the UK (2024)

Slot RTP Volatility Max Win Studio
Big Bass Bonanza 96.71% Medium 2,100x Pragmatic Play
Big Bass Splash 95.67% High 5,000x Pragmatic Play
Gold Blitz Extreme 96.00% High 5,500x Fortune Factory
Gold Blitz 94.00% High 5,000x Fortune Factory
Starburst 96.09% Low 50,000x NetEnt
Bonanza 96.00% High 26,000x Big Time Gaming
Book of Dead 96.00% High 5,000x Play'n GO
Gates of Olympus 1000 96.50% High 15,000x Pragmatic Play
Rising Rewards 96.01% High 5,000x Triple Edge Studios
Big Bass Christmas Bash 96.71% High 5,000x Pragmatic Play

How to Pick the Best Slot to Win Real Money

Online real money slots are the heart of casino games. It's an understatement to say a slot game collection determines the future of an online casino. To cover every player's needs, the number of slot games at the best online casinos in Ireland can add up to several thousand these days.

However, having too many options often leads to confusion. Some of you might wonder, "Which slots should I play for real money?" or "Are there any ways to find the best real money slots for me?".

There are many elements to consider when choosing the best slots to play online for real money. So, here are the key factors you should know about real money online slots:

  • RTP
  • Volatility
  • Bonus Rounds and Free Spins
  • Bonus-buy Feature
  • Game Studios

Let us break down each element for you below.

  • RTP

    RTP stands for Return to Players in online gambling. It indicates how much an online real money slot pays out to players from all the money bet on the game.

    • For example, in theory, an online real money slot with an RTP of 97% returns £97 for the total bet amount of £100. The rest 3% is the so-called house edge, i.e. profit for the house (casino).

    Theoretically, you are expected to lose 3% of your money in the long run if you keep playing on an online slot whose RTP is 97%. However, it does not mean you cannot win big money by playing online slots if you understand the concept of probability and volatility.

    Of course, the higher the RTP of an online slot, the more winnings you can expect in the long term.

  • Volatility

    Volatility in online real money slots is like a game's way of saying how often and how much it will give winnings. Imagine a slot game is like a treasure chest. If a game has high volatility, it's like a treasure chest that doesn't open very often, but when it does, there's a chance of finding a lot of treasure there.

    Sugar Rush Volatility

    Let's say there are two online slot games for real money whose RTPs are the same at 97%, but one has high volatility while the other has low volatility. The high volatility slot pays less often, but when it does, you're likely to hit a big win. On the other hand, the low volatility slot pays more often but in small amounts.

    By and large, these two games pay out in different frequencies and sizes but return the same amount of money to you in the long run.

    Playing slots with high volatility might make you feel like you never win because of their low payout frequency, but it comes with the absolute excitement of potentially winning a fortune. On the contrary, real money slots with low volatility would be a better option if you want to keep it safe and enjoy the experience of playing slots for a long time.

  • Bonus Rounds and Free Spins

    In essence, slot bonus rounds are special game rounds within a slot machine that activate at certain moments during your play.

    These bonus games might be triggered by landing scatter symbols or activated randomly. Sometimes, you can initiate them at any point for a fee.

    Nolimit City Punk Rocker Bonus round

    Free spins are spins that don't require you to use your balance. These are commonly found in numerous online slots for real money. To access them, you typically need to land a set of special symbols in a single spin.

    Engaging in online slots with real money can be expensive, especially when luck isn't on your side. Free spins offer an opportunity to play and potentially win without any cost. Additionally, some video slots provide opportunities to gain extra free spins while using your current free spins, leading to an extended series of cost-free gaming rounds.

  • Game Studios

    There are a multitude of game studios that produce real money slot games online. They strive to add something unique to their products to stand out. Some of them put efforts into creating high-quality animation and sounds, while others specialise in developing new features to make the experience exceptional.

    Hacksaw Chaos Crew2 Gameplay

    Knowing what game studios have what slot styles helps you select the best game studio that suits your taste.

Introduction to Online Slots - Real Money Slot Games

Slot machines, once known as one-armed bandits, have evolved with advanced technology, offering fun and exciting online gaming today. Over 70% of casino games online are now slot games, available on online gambling sites and mobile apps.

Online slots attract players with the potential to win big from small bets. Their entertaining gameplay also adds to their appeal. The UK is home to a vast array of online slots from numerous developers, featured on top slot sites.

For those overwhelmed by the choices, our guide highlights the best UK online slot sites. Easily compare the best UK online casinos offering real money slots, including their game variety, payout rates, and top game providers like NetEnt and Microgaming.

Why Choose Online Slots?

Their simplicity and the chance to win big - often in the millions - make online slots hugely popular in the UK. Additionally, many casinos offer free spins as incentives, adding to their attractiveness.

Online slots are user-friendly and convenient, playable on mobile devices anywhere. They often feature higher jackpots than physical machines and progressive jackpots that can grow to significant amounts.

With high Return to Player (RTP) rates, typically between 94% and 97%, players receive a large proportion of their stakes back over time. Slot tournaments add excitement, with competitors vying for prizes and grand rewards based on their winnings.

Understanding Online Slots

Unlike old mechanical machines, modern online slots use software to simulate reel spinning. Wins are based on lining up matching symbols in various patterns. Players can choose how many lines to play, affecting the stake per spin.

Jackpot symbols offer the most significant prizes but are less likely to appear. Many games feature bonus rounds triggered by specific symbols, offering extra challenges or puzzles for additional wins.

Online slots function similarly to physical machines but are controlled by software and display results on a screen. They use Random Number Generators (RNG) to ensure fair play, with independent audits required for legality in the UK.

In gameplay, you select your stake, wager amount per pay line, and the number of paylines. Options like autoplay allow for continuous spinning without manual input. Wins are automatically added to your balance, which you can choose to either gamble with or withdraw.

Different Types of Online Slots for Real Money

Online slots have diversified significantly, offering a variety of gameplay styles despite all being governed by Random Number Generators. In the United Kingdom, top online slot casinos often prioritise these games, presenting a vast selection that includes 3D slots, video slots, and those themed around popular media.

3-Reel Slots

  • Also known as classic slots, these are the traditional form of slot machines.
  • They have three vertical sections, or reels, which spin when the game is played.
  • Winning combinations are typically made by matching symbols across a single payline, often the middle line of the reels, although some 3-reel slots may have more paylines.
  • These games are known for their simplicity and often feature classic slot symbols like fruits, bars, bells, and 7s.
  • The design and sound effects often mimic old-school mechanical slot machines, appealing to players who enjoy a nostalgic gaming experience.
Fire Joker 3-reel slot

5-Reel Slots

  • These slots are a more modern variation and are prevalent in online casinos.
  • They consist of five vertical reels and usually have more paylines than 3-reel slots, increasing the number of possible winning combinations.
  • 5-reel slots often come with additional features like free spins, bonus rounds, and various types of wild symbols.
  • The themes and graphics in 5-reel slots are typically more diverse and visually engaging, ranging from adventure and fantasy to pop culture themes.
  • The complexity and variety of bonus features in 5-reel slots make them attractive to players looking for a more dynamic and interactive gaming experience.
Striking Hot 5 5-reel slot

Megaways Slots

  • Megaways is a slot game format developed by Big Time Gaming. It revolutionized online slots with a unique reel modifier mechanism.
  • These slots offer a dynamic payline system that changes the number of symbols appearing on each reel during every spin, typically ranging from two to seven symbols per reel.
  • The changing reel structure means the number of ways to win varies with each spin, often offering thousands of possible winning combinations, sometimes exceeding 100,000 Megaways.
  • Megaways slots often include features like cascading reels, free spins, multipliers, and wild symbols.
  • The unpredictability and potential for high numbers of winning combinations make Megaways slots very popular among players who enjoy dynamic and fast-paced gameplay.
Great Rhino Megaways slot

Jackpot Slots

  • Jackpot slots are games that offer a jackpot as the main prize, which can be won in various ways depending on the game’s rules.
  • There are two main types of jackpot slots: fixed and progressive.
  • Fixed Jackpot Slots have a predetermined maximum payout that does not change.
  • Progressive Jackpot Slots have a jackpot that increases every time the game is played, but the jackpot is not won. The jackpot continues to grow with a portion of every bet made by players until it is won, often reaching extremely high amounts.
  • Progressive jackpots can be individual to a single game or linked across multiple games and even multiple casinos, leading to multi-million-dollar prizes.
  • Jackpot slots are favoured by players seeking the chance for large payouts, though the odds of hitting the jackpot can be quite long.
Coin Charge Jackpot slot

Cascade Slots

  • Also known as cascading reels or tumbling reels.
  • In these slots, winning symbols are removed from the reels after a win, allowing new symbols to fall or 'cascade' into their place.
  • This can lead to consecutive wins from a single spin, as the new symbols can form new winning combinations.
  • The cascades continue until no more wins are formed.
  • Often, these slots include additional features like increasing multipliers with each cascade.
  • The cascading mechanism adds an extra level of excitement and can lead to extended play from just one spin.
Gonzo's Quest Cascade slot

Cluster Slots

  • Cluster slots, also known as cluster pays slots, are a type of online slot game where payouts are awarded based on clusters of symbols.
  • Instead of the traditional payline system, these games typically pay out when a group of the same symbols form a cluster, often touching horizontally or vertically.
  • The size of the cluster needed to win varies from game to game, but it typically involves a minimum number of matching symbols that must be adjacent to each other.
  • These games often come with unique features like cascading reels, where winning symbols disappear and new symbols drop down to replace them, potentially forming new clusters.
Reactoonz Cluster slot

Grid Slots

  • Grid slots are characterised by their layout, which is typically in the form of a grid (like 5x5, 7x7, etc.).
  • Unlike traditional slots, which have reels that spin vertically, grid slots display their symbols in a grid format, and winning combinations can be formed in various patterns across the grid.
  • These games can include cluster pays mechanics, but they may also employ other methods of determining wins.
  • Grid slots often feature more complex gameplay and may include elements like cascading symbols, bonus rounds, and special features triggered by certain symbol combinations.
Sugar Rush Grid slot

Highest Payout Slot Machines in the UK (2024)

Below we listed the top highest payout slot machines in the UK:

Slot RTP Studio
Moody Fruits 99.91% Relax Gaming
Greatest Circus 99.54% Gragoon Soft
Fruity Beats Xtreme 99.08% Spinmatic
Ugga Bugga 99.07% Playtech
Book of 99 99.00% Relax Gaming

Online Slots Bonuses and Promotions

If there’s one thing that online casinos do well, it’s promotions and bonuses - especially when it comes to online slots.

Online slots are very, very popular with players, which is why the online casino sites are keen to offer lucrative bonuses to attract new players and run regular promotions to keep players loyal.

Here is a rundown of the most common types of bonuses and promotions for online slots that you can find out there and where to find them.

Welcome Bonus - Deposit Match

The welcome bonus is only open to new players that register at an online casino and players can only claim it once. A deposit match bonus is a welcome offer that gives new players a bonus that matches (or sometimes doubles) the amount of their first deposit (or first two or three deposits).

One of the best-matched deposit bonuses available at an online slots site at the moment is with The Grand Ivy which offers a 100% match bonus up to the value of £1500 (spread over the first three deposits), plus 100 bonus spins.

Welcome Bonus - No Deposit Slots Bonus

As online casinos compete more and more fiercely with each other to get new customers, no-deposit welcome bonuses are becoming increasingly common. As the title suggests, these welcome offers don’t require any deposit, you simply need to register for the site and verify your ID to qualify.

The best no-deposit welcome bonus at the moment is available at 888casino where they give you £88 worth of free play credits.

Free Spins

Free spins can be offered as part of a welcome bonus or as an offer to existing customers. There is no deposit needed, but they usually have wagering requirements attached to them to release any winnings.

In other words, you usually need to wager between 20 and 50 times the bonus amount before you can withdraw the winnings as cash.

No Wagering Bonus Spins

These are sometimes referred to as no wager free spins and they are the best time of “free spin” as you don’t need to meet any wagering requirements. This means that any money you win by using the bonus spins is yours to keep and you can withdraw it right away.

Reload Bonuses

Reload bonuses are bonus spins or deposit match bonuses that are given to you when you reload your account, i.e. make another cash deposit into your casino balance. Reload bonuses are usually run as occasional special offers that are time-limited, rather than ongoing promotions.  

Slots Tournaments

Slots tournaments are fun promotions that have a set prize pool to be distributed amongst players that score highly on a leaderboard. During the set time of the tournament, players score points for money won or money staked. The prizes are usually heavily weighted towards the top one, two, or three players.

William Hill, Bet Victor and Virgin Casino are recognised as the top 3 casinos for online slots tournaments.

Popular Online Slot Providers 

Irish slots casinos are likely to feature games from a wide range of providers. Some companies are better known than others, but even smaller developers can produce fantastic slot games.

With that in mind, here are 10 of the most popular slot providers at Irish online casinos right now:

Microgaming: Claiming to have developed the world's first true online casino software in 1994, Microgaming has long been one of the industry's most important companies. Microgaming was also a pioneer in the launch of the first mobile casinos, having launched its software in 2004.

NetEnt: Swedish studio NetEnt has been one of the most popular slot providers in the world for many years. Founded in 1996, NetEnt produces all types of casino games but has a strong focus on slots. Over 200 online slots have been released on to the market by NetEnt so far.

IGT: International Game Technology is one of the best known casino game providers in the world, with a long and proud history of slot development. IGT has been around for decades but the release of a new game from this slot provider still provokes a lot of excitement.

Novomatic: A range of video slot classics are available from Novomatic, with Book of Ra, Sizzling Hot and Lucky Lady's Charm some of the company's biggest hits to date.

Playtech: Founded in 1999, Playtech is now one of the most popular slot providers in the world. At the end of 2019, Playtech launched an industry-first, with its Live Slots potentially offering a glimpse of the future of online casinos. Age of the Gods: King of Olympus is one of the best Playtech slots that is available to play at online casino sites in Ireland.

Play'n GO: Specialising in high variance slot games, Play'n GO has grown into one of the most popular slot providers around over the course of recent years. Play'n GO titles include the huge Rich Wilde series, which has spawned a wide variety of imitations across the industry.

Pragmatic Play: A leading provider of slot game content for online casinos, Pragmatic Play hits include Wolf Gold and Dog House. Despite only being founded in 2015, Pragmatic Play games can be found at most of the top online slots sites in Ireland, with the company continuing to grow.

Yggdrasil: Slots from Yggdrasil are known for their incredible design, with progressive jackpot games among those produced by the developer. ‎Valley of the Gods is one of the top online slot games to have been released by Yggdrasil, with Holmes and the Stolen Stones up there too.

Quickspin: Another Swedish studio operating at the top of the online slots industry is Quickspin, a company that focuses on quality rather than quantity. This means that Quickspin does not release nearly as many new slot games as other providers, but they are always worth trying.

Realistic Games: Last on our list of the best online slots providers is Realistic Games, a leading casino content developer. Realistic Games is the company behind the hilarious Hot Cross Bunnies game, with the UK-based firm also producing games like Take Note.

Online Slots - Winning Strategy & Tips

Although online slots rely on random chance, there are some things you can do to try and increase your chance of winning or at least limit your losses.

Check out the following list of tips to help you get the best value for money when playing online sites in the UK.

Take Advantage of Sign Up Offers

The best way to make a bit of extra money when playing slots is to find the best welcome bonuses and make sure you claim them. Whether it’s a deposit match bonus or free spins, it’s always worth trying to get hold of this free cash that is offered to new players.

Just be aware that most welcome bonuses have wagering requirements attached, which means you have to bet a certain amount on the site before the bonus is turned into cash. Look for the welcome bonuses that have no or few wagering requirements. No deposit bonuses are good too, as you don’t need to spend a penny of your own money to get a chance of making some winnings.

Define and Use a Stop-Loss Strategy

This is a more practical tip that you need to implement before and during playing. First, you need to decide how much you are willing to lose in any one session. This is not necessarily the total amount you can afford to lose, it could be the amount that is going to really annoy you and make you want to chase your losses.

Write down the limit and keep it in mind while you are playing. If you reach the stop-loss limit, let’s say £30, then you log off straight away and stop playing. You can decide how long to stop for, whether it’s a ten-minute break or stop for the day, or even week. If you stick to this strategy it will stop you from chasing your losses and should limit the amount you lose overall.

Define and Use a Stop-Win Strategy

Similar to the stop-loss strategy laid out above, the stop-win is exactly the same, but you set a limit for the amount of profit you’re in. When you get to that maximum limit you stop and take a break - ten minutes, one hour, a day - whatever you decide.

The reason for setting a stop-win limit is that it’s all too easy to feel like you’re invincible and can’t lose. Many people will then start playing at higher stakes and quickly lose all their winnings. You need to avoid this at all costs.

Set a Time Limit

Another way to limit your losses and maximise your winnings is to set a strict time limit for playing the slots. It’s easy to get carried away and play for hours upon end, but this can possibly turn into irresponsible gambling if you’re not careful. Set an alarm on your watch or phone for 30 minutes, or however long you’re willing to play, then be disciplined enough to stop when it goes off - whether you’re winning or losing. 

Only Play High RTP Slots 

Use our lists of high RTP slots and slots sites above to help you choose games that offer the best return on your money. This will help to make your bankroll last a bit longer and give you more chance of hitting some big wins.

Play the Maximum Number of winlines on Progressive Jackpot Slots

This applies to most slots sites - you cannot win the maximum amount of the progressive jackpot if you don’t play at the full stake. In other words, if you only play one winline when there are ten available and you hit the jackpot, you’ll only win 10% of it. Not everyone is aware of this fact.

Frequently Asked Questions