Best UK online slot sites & real money slot games 2025
William Macmaster
Updated 11 Jul 2025
Content Editor
Want to play slots? Get bonuses worth up to 150 free spins from the best slot sites and play for real money below, or find the UK's most popular slots to play for free – all licensed and tested by our team with 20+ years of experience.
We’ve assessed 300+ UK casinos to uncover standout slot sites for July. Scroll down to discover why these three platforms are top of our list:
1
Expert rating
5.0/5
Pub Casino - UK slot site with the highest payout rate
Pros
✅ Industry-leading 98.76% payout rate according to our data
✅ Withdrawals in under 3 hours (UK average 24 hours)
✅ 1,500+ slots from 19 top providers
Cons
❌ No free spins welcome bonus (offered by 70% of sites on our toplist)
Pub Casino boasts the highest RTP (Return to Player) among UK Gambling Commission-licensed slot sites and has over 1,500 slots from 19 providers. Other good news for slots fans is its 100% deposit match offer, which you can use to play popular games like Starburst by NetEnt and the latest releases, such as Le Pharaoh, by innovative mobile-first developers like Hacksaw Gaming.
👨💻 User review: “This is a great casino. Great games and super quick withdrawals… This is as good as any big brand casino - if you're thinking of joining, definitely do so!!!” 5/5 ⭐
- Mark Mckinley, Trustpilot review, 18th June, 2025
💡 Editor’s insight:“ To boost your chances of clearing the 40x wagering and keeping your winnings, I’d stick to high RTP slots. Pub Casino has Mega Joker at 99% – the highest RTP slot in the world – so it’s a smart choice for meeting the rollover.”
Magic Red - exclusive 100 free spins no wagering bonus
Pros
✅ Withdraw 100% of what you win from the free spins bonus
✅ Daily free spins offers
✅ 1,500+ slots from 45+ top providers
Cons
❌ No wagering free spins expire in 24 hours
Casino.org readers can claim a 100 free spins no wagering bonus from Magic Red Casino that lets you keep 100% of what you win – no rollover, no max cashout. Only 5% of UK sites offer a zero wagering bonus, so these promos are super rare. It also provides 1,500+ slots and daily free spins bonuses, making it ideal if you’re after variety and regular promos.
👩💻 User review: “I’ve had a good experience with this casino, had fast withdrawals, including today of £3,500 - the live chat team are super friendly and helpful. Would recommend.” 5/5 ⭐
- uhRazer, Trustpilot review, 25th March, 2025
💡 Editor’s insight: “Magic Red’s slot section is stacked and can make choosing games tricky. Want to try something new? Just select the homepage search bar to reveal currently trending games for some top suggestions.”
All British Casino gives you access to 1,000+ slots from big names like NetEnt, Play’n GO, and Big Time Gaming. If you’re into Book of Dead, the 110 free spins in the welcome offer give you plenty of extra play time from the start. Once registered, you’ll get 10% cashback on slot losses too!
👩💻 User review: “My new favourite! Everything is straightforward and fair! Withdrawals are so quick! Even received an email this morning apologising that my latest withdrawal was declined and they’ve processed it manually instead, but I didn’t even notice! customer service is better than most I’ve used in the past too!” 5/5 ⭐
- Francesca, Trustpilot review, May 7th, 2025
💡 Editor’s insight:“To qualify for this excellent welcome deal, deposit using PayPal, Visa or Mastercard – Skrill and Neteller payments won’t work for this offer.”
Wondering how we discover top online casinos for UK slots players? By spending hundreds of hours assessing platforms using 25+ years of industry expertise – that’s how. These are some of the many key areas we inspect:
Payout potential
One of the first things we check is a slot site’s overall RTP (Return to Player). RTP shows how much a game or casino theoretically pays back over time, based on millions of bets. Most slots range from 92% to 99%, but we don’t recommend sites that mainly feature low-paying games.
💡 Expert insight: Pub Casino has the best payout rate in the UK and is home to several high RTP slots, including Mega Joker at 99% – the highest you’ll find online.
Slot selection
Instead of ranking a slot site purely on the number of games, our expert team evaluates the variety and quality of its lobby. The best sites offer classic three-reelers, feature-packed video slots, progressive jackpots, branded titles, and exclusives from top providers like NetEnt, Hacksaw Gaming, and Play’n GO.
We also favour casinos that regularly update their slot library, so you always have access to the latest releases. A wide, up-to-date selection means you won’t need to join multiple sites just to find new and exciting games.
💡 Expert insight: Magic Red offers 1,500+ slots from 45+ top providers, including trending new releases and exclusive games you won’t find elsewhere.
Bonus value for slots players
The number of free spins in a bonus can deceive you into thinking it’s a great value deal. To qualify whether it’s worth claiming, our expert team examines the terms and conditions, including wagering requirements, max win limits, and game restrictions. The best casino bonuses have a low rollover (we consider 35x to be fair) because they are easier to cash out. Also, offers with generous win caps, and spins that can be used on the best slots in the UK receive extra plaudits.
💡 Expert insight: Love free spins bonuses? Magic Red gives you 100 no-wager free spins just for signing up, plus ongoing daily spin rewards.
Usability
The best slot sites make it easy to find what you’re looking for. Our expert team tests search tools, page load speed, and overall layout. Extra points go to sites that let you filter searches by provider, volatility, or even RTP – helping you get to the game you want to play faster.
💡 Expert insight: All British Casino scores well for its user experience, with slots neatly categorised and an intuitive search filter that lets you find games by name or provider in seconds.
Mobile play
According to a Gambling Commission study, mobile phones are the most common way to access online gambling. That’s why we test every slot site on phones and tablets. We check game load times, navigation, and whether there’s a dedicated app and only recommend sites optimised for mobile devices.
💡 Expert insight: One of the best mobile casinos in the UK is All British Casino. It offers an iOS app (rated 4.2/5 on the App Store), and the mobile browser version of the platform is quick to load, easy to use, and supports both portrait and landscape orientations for all games.
Trust, licensing, and player safety
We assess the safety of each slot site by verifying if it holds a UK Gambling Commission licence, utilises SSL encryption to protect your details, and offers professional customer support to assist you when needed via various channels such as live chat, phone, or email.
We also prioritise platforms with eCOGRA certification – a recognised, independent seal that confirms slot outcomes are random and fair.
💡 Expert insight: Jackpot City has eCOGRA-certified games and a customer support team on standby 24/7.
Overall slot player experience
Plenty of licensed slot sites offer big bonuses and huge game libraries, but still don’t make our list. If a site falls short in one key area, such as glitchy navigation, unfair free spins bonus terms, or unprofessional customer support, it doesn’t get the nod.
Don’t play at these UK online slots casinos!
Avoid these slot sites – they have unfair terms, poor support, and don’t always pay out. Instead, join one of our expert-recommended casinos that have passed our 25-step review process to ensure truly rewarding bonuses, fast withdrawals, and professional customer service.
"Having worked extensively within a top UK operator and testing 1,000+ games from over 30+ of the most recognisable game providers worldwide, you really get an understanding of what makes a slot game special. The UK market is bursting with new games almost daily meaning there's always new bangers on the horizon to slot into your 'must play' list like Big Bass Bonanza, Eye of Horus or Gold Blitz. Do your research and understand what really appeals to you; whether it be juicy jackpots, high RTP titles or a truly exciting bonus round including top mechanics like free spins, Hold & Win or special original bonus games."
Free online slots – No deposit, no download, no sign up
Play slots for free to explore innovative features, try games with different volatility (how often they pay), and find new favourites without risk. Our collection includes over 19,000 casino games – one of the largest in the UK. Not sure where to begin? Check out our expert picks below.
A recent YouGov study found that UK slot players value four things most: 51% want a user-friendly site or app, 43% look for top bonuses and promotions, 37% value a wide variety of games, and 26% prioritise smooth payments and loyalty rewards.
Based on this, our expert team has picked top casinos for each category.
PlayOJO – win or lose, get no wagering cashback on every bet
Top 10 online slots reviewed UK (2025)
With thousands of games available, choosing one to spin for real cash prizes is tricky. Need some help choosing? Our team – with over 20 years of slot expertise – have handpicked the 10 best real money online slots for UK players, based on RTP, volatility, bonus rounds, and overall gaming experience. Scroll down to compare your options
Slot
RTP
Volatility
Max win
Best casino to play
Big Bass Bonanza
96.71%
Med-High
2,100x
Betway
– 125 wager-free spins
Money Train 2
98%
High
50,000x
Jackpot City
– 100% up to £100
Book of Dead
96.21%
High
5,000x
HeySpin
– 100 free spins
Starburst
96.01%
Low
500x
Simba Slots
– 500 free spins
The Dog House
96.51%
High
6,750x
Myriad Play
– Daily free spins
King Kong Cash
95.79%
Low-Med
50,000x
All British Casino
– 10% cashback
Gonzo’s Quest
95.79%
Med-High
3,750x
Pub Casino
– 100% up to £100
Sweet Bonanza
96.60%
Med-High
21,100x
Jackpot City
– 100% up to £100
Rainbow Riches
95%
High
500x
Rainbow Riches Casino
– 30 free spins
Gold Blitz Extreme
96%
High
5,500x
Neptune Play
– 100% up to £100
🎣 Big Bass Bonanza - Pragmatic Play
Pragmatic Play's Big Bass Bonanza features a 200x max win in the base game and a whopping 2,100x max win limit in the free spins mode, cementing itself as a top pick for UK slots players.
💡Editor’s insight: "An instant hit that helped define Pragmatic Play’s slot portfolio. Still one of the most featured slots in UK welcome offers today." — William Macmaster, Casino Expert
Expanding on the Wild West action of the original, Money Train 2 has upgraded the total number of bonuses from 5 to a whopping 11 in the bonus game. The title also boasts one of the highest RTPs in the UK market (98% ) and has a huge max win of 50,000x your bet.
💡Editor’s insight: "Big win potential + high RTP = must-play. Its unique bonus round is among the best in the business.” — Lewis Crane, Casino Expert
Book of Dead builds on Novomatic’s classic Book of Ra with a higher RTP (96.21%) and more exciting bonus features. It’s one of the top high volatility slots for UK players looking for bigger wins.
💡Editor’s insight: "An all-time classic. Ideal for bonus chasers and anyone who enjoys high-risk, high-reward slots.” — Lewis Crane, Casino Expert
Starburst is a UK slot scene favourite thanks to its simple gameplay, glitzy graphics, and frequent win rate. With 10 paylines and up to 250x payouts, it’s easy to follow, making it a top pick for new and casual players alike – this is why it features in plenty of free spins offers at top UK casinos like NetBet.
💡Editor’s insight: "A staple of the slot world. Still a popular pick, especially with beginners.” — Adam Volz, Casino Expert
Slot fans love The Dog House for its quirky animal theme and huge 6,750x max win. It’s a high volatility slot, so keep in mind that wins are less frequent compared to low volatility games. On the flip side, the chances of hitting big wins on any successful spin are much higher than in games like Starburst or Big Bass Bonanza.
💡Editor’s insight:"Packed with sticky wilds and multipliers. The bonus round is where this game shines.” — Ian Zerafa, Casino Expert
King Kong Cash packs a primate punch with up to a 50,000x max win and an impressive 14 unique bonus games to unlock. The medium volatility also means it doesn't take long before you can land a winning spin. Additionally, the prizes are typically larger than those in low volatility slots, such as Da Vinci Diamonds or Butterfly Staxx.
💡Editor’s insight: "The huge win potential is what draws players in. For more action, try the Even Bigger Bananas sequel." — William Macmaster, Casino Expert
Perhaps only second to Starburst in popularity, this NetEnt slot has long held its spot as one of the top ten. The 3D graphics of Gonzo’s Quest and the innovative Avalanche reels feature have cemented the game as a top title for UK players. This slot also features special multipliers in both the base game and free spins, meaning you have the chance to unlock additional bonuses right from the first spin.
💡Editor’s insight:"A trailblazer. Gonzo’s animations and mechanics still hold up. Always worth a spin.” — Lewis Crane, Casino Expert
This slot features a 'Pay Anywhere' option, allowing symbols to pay regardless of their position on the reels. Sweet Bonanza’s Medium volatility also means there's a fair chance to trigger a win on any given spin. Plus, every win triggers a cascading feature, clearing the reels and giving you extra chances to win again and again.
💡Editor’s insight:"Bright, fast-paced and full of big-win potential thanks to those multipliers. Always a fun choice." — Adam Volz, Casino Expert
Along with being a stalwart at the best online casinos in the UK, Rainbow Riches is a popular slot machine at land-based casinos – a testament to its wide appeal. This Irish folklore-themed classic features three interactive bonus games – from rolling dice to spinning wheels and picking pots – that add an extra layer of excitement to every session.
💡Editor’s insight:"A retro slot that’s still going strong. Inspired a whole brand — can’t say that about many games.” — Lewis Crane, Casino Expert
The sequel to the massively popular Gold Blitz, Gold Blitz Extreme takes the solid foundation of 2022's original and supercharges it with brand-new features and a boosted max win of up to 5,500x (500x more than the original). Also, the title retains the High volatility and 96% RTP of the original.
💡Editor’s insight: "Builds on the solid gameplay of the first in the series with more firepower. If you liked Gold Blitz, this is an easy next step.” — William Macmaster, Casino Expert
"The games selected are the cream of the crop for UK online slots based on their popular themes and exciting mechanics. These are the titles that sit at the top of most UK casino lobbies and will sometimes make part of their welcome bonus. Big Bass Bonanza is a particular favourite of mine and makes up part of the welcome offers for top casinos like HeySpin and Mr Mega."
The best new slot releases for 2024
Every single day brand new slots hit casino game libraries across the UK. Here are some top picks you should look out for in the coming weeks and months.
🎰Slot
⚙️Software Provider
📅Release Date
Money Sleigh
Relax Gaming
🔥Out Now
Diamond Doggies
Red Tiger
🔥Out Now
Money Mayweather
Neon Valley Studios
🔥Out Now
Eternal Empress Freeze Time
Pragmatic Play
🔥Out Now
Big Bass Xmas Extreme
ReelPlay
🔥Out Now
Winter Champions
Relax Gaming
November 19th 2024
Munchies
NoLimit City
November 19th 2024
Emberfall
Slotmill
November 19th 2024
Saint Nicked 2
Lucksome
November 20th 2024
Split Happens
Thunderkick
November 20th 2024
How to play online slots
Slots are the #1 most popular type of online casino game in the UK and it's not hard to see why. Online slots are simple, fun, and can be packed with tons of unique features and bonus games. Whether you're a slots veteran or delving in for the first time, check out our step-by-step guide and you'll be spinning like a pro in no time.
Step 1 - Choose one of the top-rated slots sites from our toplist
Complete their sign-up process by registering your details. Most will come with a bonus for new sign-ups like free spins or bonus funds to help get you started.
Step 2 - Explore the casino's slot library
Once signed up, access the "Games" section of the casino to see what slots they have available for you to play.
Step 3 - Find the perfect slot for you
Filter slots based on game providers, slot type, or theme. Select a game of your choice and wait for it to load up.
Step 4 - Understand the game mechanics
Check the paytable options on any game to get an understanding of how to play, the available paylines, and all of the exciting bonus features to discover.
Step 5 - Choose bet size and spin
Choose your bet level by using the '+' or '-' or press spin to begin. Higher bet values do mean higher potential wins, but it makes bigger losses more likely too! Play responsibly and always stay within your means.
Step 6 - Inspect your spin outcome
Once the reels have finished spinning, wins are calculated with 3 or more matching symbols being a standard for triggering a win.
Step 7 - Look for bonus rounds to trigger bigger wins
Some slot games can include bonus base game features that can trigger on any spin including win multipliers, cascading reels or special Wilds that will substitute for any symbol in a win.
Slot game symbols and bonus features you should know
There are two elements of online slot gameplay, the base game and bonus rounds!
🎰 Base game
The base game in a slot is where you start whenever you load up an online slot. In this mode, you will attempt to turn your spins into cash by lining up symbols on the slot reels in what is known as "paylines" or "win lines". Different symbols will have money values with higher-value symbols offering you better payout amounts if you line them up. Paylines and symbols will vary from game to game with some offering more than others. As well as standard paying symbols, most slots also have special symbols that can add extra surprises to your gameplay. The most common you can find on any spin are "Wilds", "Multipliers" and "Scatter Symbols".
"Wilds" can be found on most slot games and can act as any paytable symbol when a win is triggered on the reels. Wilds can also sometimes have cash values of their own and be matched as their own symbol type.
"Multipliers" can appear in popular slot titles as part of existing symbols or as their own unique symbol. When matched on a winning spin, Multipliers can add to your total win value by adding a times multiplier to the value. No need to bust out the calculator as you can see your wins doubled, tripled, or even supercharged with up to a 10x win multiplier.
"Scatter Symbols" can be found on many slot games and are the key to unlocking special free spins modes or bonus games. Match 3 or more anywhere on the reels and you've punched your ticket to some extra games.
🏆 Bonus rounds
Bonus rounds come in many forms and generally take the form of a "free spins" round. You will be awarded a number of spins that do not deduct from your cash balance and tick down by 1 each time you spin.During a free spins round, any number of other special features can trigger to boost your overall winnings during the round. At the end of the free spins round, you will be awarded the total amount won in the free spins round directly into your casino credit. Titles like Big Bass Bonanza or Immortal Romance further spice up the experience with additional features unique to their free spins mode. Big Bass Bonanza features an exclusive 'Cash Collect' feature that allows for up to 2,000x in instant prizes while Immortal Romance has up to 4 unlockable free spins modes; each with their own set of character-themed bonuses like multipliers and Wild symbols. During a bonus round, you can activate a number of additional features including:
Stacked Wilds - Prominent in titles like Book of Dead and Eye of Horus, some bonus rounds will add Wilds that will stack to turn entire reels Wild; covering multiple paylines for wins.
Unlockable Reels - Some bonus rounds will give you even more space to spin with additional reels and expanded paylines for even more chances to win.
Random Modifiers - These can be found in a number of titles and will add special enhancers to your spins including random Wilds, win multipliers, giant paytable symbols, extra spins and more.
Win Boosters - Games like Enchanted Prince and Sugar Train award an instant multiplier for every win during the free spins mode to help boost your total values.
Other slot game features
The below features can appear either in the base game or the bonus round, depending on the game you are playing. Many online slots will offer some of these features but each game is different and will offer varying features including:
Feature
How it works
💧Cascading Reels
Symbols that disappear when matched in a payline causing the reels to drop down and add even more symbols onto the reels. These new symbols can then cause a medley of winning combinations with each consecutive win adding even more symbols.
📈Win Multipliers
An element of the game where winnings are multiplied gradually (1x each win) as your number of consecutive symbol matched grows.
🔄Respins
A free new spin that occurs after a paid or bonus spin due to an in-game event, giving you a second chance to win on that spin.
↕️Expanding Wilds
Wilds that extend to cover whole reels when triggered to turn the entire reel Wild and give a higher chance of activating a winning payline.
💥Exploding Wilds
Wilds that explode when triggered, causing new symbols to appear on reels close to the exploding wild.
What our experts say
Lewis Crane, Assistant Gaming Specialist
"Be mindful that not all slot games offer bonus rounds. Classic slot titles like 7s Deluxe or Burning Wins streamline the experience with just 5 available paylines and no bonus game to keep that retro slot machine feel. Always check the paytable to get an idea of what a game has on offer when it comes to bonus rounds."
Types of UK online slots
There are over 28,000+ available online slot games and they all come in different shapes and sizes. Each slot is its own adventure and can differ greatly from game-to-game. Take a look at the varieties below for an introduction to the different types of online slots in the UK.
Classic slots
Three-reel slot games are based on classic fruit machines found in land casinos. This type of slot machine usually features classic symbols like fruit and playing cards. To win, simply line up three matching symbols on a single payline. Three-reel games generally do not include a bonus game and use additional symbols like Wilds very sparingly.
Multi-reel or multi-payline slots give multiple winning combinations across the reels. Typically, the number of paylines can be anything from 25 to well over 100 and stretch diagonally, horizontally, in a V-shape or even zigzag over the reels. Tap below to play slots online for free and try out plenty of multi-reel games!
Video slots are another form of online slot machine. This type of slot tends to offer a more immersive experience and allows players to win through interactive bonus features or 3D animation. Most online casinos will have a good range of video slots including games like Wheel of Fortune, Thunderstruck II and Wizard of Oz.
Progressive slots offer a jackpot that increases every time a bet is made and won. Essentially, a small percentage of every winning bet goes towards the jackpot. For top games, the final prize can reach well into the millions including jackpot mechanics like Jackpot King or WowPot. Most online casinos will differentiate between a classic slot and a jackpot slot. To try progressive slots for yourself, head to our free games section below.
When Megaways began appearing on online slot site game libraries courtesy of Big Time Gaming, players instantly went crazy for the ability to benefit from more paylines than ever before. Thanks to a random reels modifier, with each spin you make, the paylines change. This equates to a massive 177649 total possible ways to win when you play on Megaways slots!
Keep your eyes peeled for the special Megaways tag on certain slot games to try them out for yourself including Bonanza, The Dog House Megaways and Big Bass Bonanza Megaways.
Must, Daily and Mega Drop Jackpot slots
Coming from the masterminds at Red Tiger, these twists on the classic progressive jackpot style mean that players can better predict slots that are about to pay huge winnings to lucky players. Must Drop jackpots indicate a slot where the winnings must be won before hitting £1000, Daily Drop jackpots mean that prizes are guaranteed before 22:00 GMT each day, and Mega Drop Jackpots will drop before a maximum value - which can max out as high as £15,000!
High volatility slots
For those looking to play the long game, high volatility slots are perfect for them. These use a mechanic where wins come less frequently but when they do come, they provide much larger win amounts. Hence, while you may not get a win for a while, when it does come, it will be worth the wait.
3D slots
3D slots take the impressive graphics of online slot games a step further with cutting edge 3D graphics that take the game to a whole new level.
Immerse yourself in your slots fun in a whole new dimension on titles like The Rift and Jungle Jim or browse the list below.
Maximum win slots
Maximum win slots are the best of the best when it comes to winning potential. All slots offer a limit to how much can be won but max win slots are games that blow other slot winnings out of the water. Ranging from as high as 200,000-300,000x your bet amount, they can see even modest bets pay out significant sums!
Keep in mind that, for most maximum win games, the top payouts are only available when playing at the highest potential bet levels. Ensure that you always play responsibly and only up your bets when you feel comfortable to do so.
Bonus buy slots
Many online slots offer a bonus round which gives players the chance to potentially win more when it is triggered. With bonus buy slots, players can pay to bypass the normal gameplay and dive straight into the bonus round giving them the chance to play the bonus round and potentially cash in. Please note though that these types of slots are prohibited in the UK.
Read more about slots strategies
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, practising their bonus rounds and knowing their paylines inside and out. Follow these guides to give yourself the best possible chance to win.
What is a payout percentage?
As a slots player, the payout percentage (RTP) indicates to you how much of your money bet will be paid out in winnings. Every slot and casino game has an RTP percentage that can be found in the paytable with most slots in the UK having an average of 95%-96%+ depending on game and provider. 💡Expert insight: "Remember that RTP is calculated on average over 1,000,000+ spins and is a guideline on what you could win. Your personal RTP can be higher or lower depending on how you play as RNG still plays the biggest factor on if a spin will be a winner or not."Check out the table below for a clear understanding of how RTP & volatility can affect your average slots experience including what makes them different.
Online slots by highest RTP in 2024
Every online slot has a built-in RTP percentage that is different for each game played. In the UK, 95%+ is seen as the standard for a solid game RTP with titles frequently hitting the 96%+ range to better cater to players. The following slots offer some of the highest RTP (Return-To-Player) in the UK to help maximise your chances of spinning a winner. Spin on the best RTP online slots including:
Rank
Slot Game
Developer
RTP
1
1429 Uncharted Seas
Thunderkick
98.50%
2
Bloodsuckers
NetEnt
98%
3
Money Train 2
Relax
98%
4
Blood Suckers Megaways
Red Tiger
97.66%
5
Aztec Powernudge
Pragmatic Play
97.57%
6
Sugar Rush 1000
Pragmatic Play
97.50%
7
Wild Swarm
Push Gaming
97.03%
8
9k Yeti
4ThePlayer
97%
9
Fruit Warp
Thunderkick
97%
10
Gorilla Gold Megaways
Blueprint
97%
RTP vs Volatility - what's the difference?
Understanding game, odds, and payout mechanics is crucial for all areas of online gambling. For slots, there are two key aspects to understand. Return to Player rate (RTP) and "Volatility" also known as variances. Our experts have broken them and compared them so you know the difference.
RTP (Return to Player)
Volatility
RTP indicates the average monetary return a player can expect when playing a slot game over a long period of time.
Volatility indicates the likelihood of a slot triggering a win on any given spin and also has a factor in determining the total win value of each successful spin.
RTP is calculated as a percentage out of 100% with most slot games ranging from 88%-96%+ depending on market and configuration.
Volatility is measured on a scale of Low-High with each slot having 1 of 5 preset volatility levels from Low, Low-High, Medium, Med-High, or High
Higher RTP games are objectively better for your gameplay than lower RTP slots as the chances to win are statistically higher on average.
While volatility has an impact on your playing experience, no specific volatility is objectively better and will depend on what you prioritise as a player between frequent wins and high value wins.
For example: A slot with an RTP of 98% will, on average, return £98 for every £100 spent on bets.
For example: A low volatility slot will have a higher chance of triggering a win on any given spin but the overall payout values will be lower than a high volatility slot.
My one top tip for playing online slots?
Steve Bourie - Author of the American Casino Guide
"Don't overbet your bankroll. The point of playing in a casino is entertainment. You want your money to last as long as possible. Don't go betting $10 a spin, or buying $50 bonus rounds if you only have $200 to play with. Also, find a game that matches your play style. If you like lots of small wins, find a game that is low volatility, if you like bigger wins less often, find a high-volatility game."
Slot bonuses and promotions in the UK
Wager free spins
Wager free spins remove the need for wagering so you can keep what you win. Make a deposit and earn your spins. Any winnings you make will then be yours to withdraw.
💡Example: Stake £20 and earn 100 wager free spins on Fire Joker.
Sometimes referred to as "Bonus" or "Extra" spins, free spins are a number of spins a casino will award you when you make a deposit. You can generally get between 50-200 free spins when you make a deposit to use on selected slots.
💡 Example: Deposit £20 and earn 100 free spins on Book of the Dead
✖ Typical wagering: 35x
▶️Available at: Neptune Play, Grand Ivy, Dream Vegas
No deposit free spins remove the need for a deposit to earn bonus spins. Register your details and you will earn a small number of free spins on selected games.
💡Example: Register your details at a new casino and earn 5 free spins on Diamond Strike
These offers are all about bonus cash. Make a deposit and the casino will match your deposit with a bonus percentage. You will then have your deposit amount plus the bonus cash.
💡Example: A 100% up to £100. Deposit £100 and get £100 in bonus cash. Making your total balance £200.
✖ Typical wagering: 35x
▶️Available at: Pub Casino, Jackpot City, All British Casino
The online casino scene in the UK is packed with iconic titles from some of the most recognisable software providers worldwide. When it comes to video slots, these guys know their stuff with high production value and a wealth of experience that goes into the creation of every curated online slot game. 💡Expert insight: "Remember that not all slots are the same as each provider loves to add their own signature touches to each title. Play a variety and you might start picking up on some of the flavours that separate a Pragmatic Play slot from a Blueprint slot".Here are some of our favourites to look out that can showcase an outstanding games library at a top online casino:
Blueprint
Hitting the gaming scene in 2001, Blueprint has cemented itself as one of the UK's top software providers with top-performing titles like Fishin' Frenzy and Eye of Horus. They have also successfully converted film and TV shows, like The Goonies and Rick and Morty, into thrilling slot games. The provider has also solidified itself in the slots market with its legendary Jackpot King progressive jackpot feature that has risen to over £1,000,000.
📍 Established: 2007
🎰 Number of slots: 200+
🌟 Popular slots: Fishin' Frenzy, King Kong Cash, Eye of Horus
Playtech
The world's largest supplier of online games, Playtech has stamped its mark in over 40 regulated jurisdictions and has a presence in over 180 countries worldwide. The provider boasts over 300 original slot game titles including the legendary Age of the Gods series and a plethora of licensed slot titles based on some of your favourite properties like Superman, Gladiator and The Matrix.
📍 Established: 1999
🎰 Number of slots: 300+
🌟 Popular slots: Age of Gods, Buffalo Blitz, Epic Ape
Apricot (formally Microgaming)
One of the leading gaming providers in the industry, Apricot Games, formally known as Microgaming, boasts over 1,300 games from over 40 independent gaming studios. Each studio brings a unique flavour to the iGaming world and includes studios like JustForTheWin, Gameburger, and PearFiction.
📍 Established: 1994
🎰 Number of slots: 1300+
🌟 Popular slots: Mega Moolah, Thunderstruck II, Immortal Romance
Pragmatic Play
A relative newcomer in the online gaming scene, Pragmatic Play have wasted no time in becoming one of the most recognisable casino brands in the UK market. Boasting a collection of over 500 original slots and casino games, the provider has taken the gambling world by storm with its Big Bass Bonanza series which still regularly appears as part of top casino's welcome offers.
📍 Established: 2015
🎰 Number of slots: 500+
🌟 Popular slots: Big Bass Bonanza, The Dog House, Gates of Olympus
Light & Wonder (formally Scientific Games)
This Las Vegas-based outfit is one of the oldest software providers in the UK and has more than a few iconic titles under its belt. UK punters need not go far to come across a few recognisable titles from the provider including Spartacus, 88 Fortunes and the iconic Rainbow Riches which now boasts over 25 original titles in the series alone.
📍 Established: 1973
🎰 Number of slots: 100+
🌟 Popular slots: Spartacus, 88 Fortunes, Rainbow Riches
Netent
A powerhouse in slot game innovation, most of the top 20 UK slots played every year have come from their studio, including classics like Gonzo's Quests and Starburst. In 2020, Netent was merged into the Evolution casino brand to bolster its slots portfolio alongside other studios like Red Tiger and NoLimit City.
📍 Established: 1996
🎰 Number of slots: 200+
🌟 Popular slots: Starburst, Dead or Alive II, Gonzo's Quest
Best online slot themes
One of the biggest factor that help determine the popularity of an online slot is the wide variety of slot themes available. Whether you're looking to dive below the waves, explore ancient temples in search of Egyptian treasure, or fancy a jaunt over the Irish hills; there's a slot to fit every tastes. Need a hand getting started? Check out some of the top titles below centred around some of the most popular slot themes in the UK.
What our expert says
Lewis Crane, Assistant Gaming Specialist
"Slot themes have more of an impact for UK players in picking their favourite games than any other factor. From my experiences working within UK operators, fishing and Irish slots are particularly popular with titles like Big Bass Splash and 9 Pots of Gold frequently appearing in an online casino's top 50 best performing games."
Best fishing slots
Fishing games are the undisputed king of the UK slots gaming scene with more than a few worth hooking for your list of faves. Check out some of the most popular fishing slot titles including:
Fishin' Frenzy - Blueprint
One of the first big fishing games to hit the UK slot scene, Fishin' Frenzy was the inspiration for other top fishing titles including Big Bass Bonanza and Wild Wild Bass 2. Check out what makes this title a standout including:
✅ 50,000x max win
✅ 96.12% RTP & Low volatility
✅ Free spins mode with instant cash collect symbols
Fans of Big Bass Bonanza should be right at home in this supercharged version of the original title. Featuring tons of extra bonuses, Big Bass Splash upgrades the Big Bass Bonanza formula including:
✅ 5,000x max win (2,900x more than Big Bass Bonanza)
✅ 96.71% RTP & High volatility
✅ Upgraded free spins mode with additional win modifiers & features
The fishing action just got bigger with one of the most popular titles from UK casino staple; Inspired Gaming. Check out what makes this Inspired's premiere fishing title including:
Irish games are another popular slot theme with plenty of ways to go over the rainbow in search of gold. Some of the earliest slot machine titles are Irish-themed and the trend continues in some of the most popular online slots including:
9 Pots of Gold - Games Global
One of the premiere slot titles from Gameburger Studios, 9 Pots of Gold adds plenty of pots to turn into cash prizes. Check out all of the key features that make this a top title including:
✅ 2,000x max win
✅ 96.24% RTP & Medium volatility
✅ 2 bonus games including free spins and Epic Strike instant cash prizes
One of Blueprint's most popular Irish slot series, Luck O' The Irish has cemented itself as a player favourite with more sequels than you can shake a rainbow at. Check out what makes this a top title including:
✅ 2 bonus games including an instant prize wheel with up to 2,000x in cash prizes
✅ 95% RTP & High volatility
✅ 13+ games in the series including Megaways, Jackpot King and sequels with additional bonus games
Expanding on the Rainbow Riches mega-hit, Rainbow Riches Megaways boosts the action with some new features and ways to win. Check out all of the improvements including:
✅ 117,649 ways to win (Only 20 in the original)
✅ 95.90% RTP (95% in the original)
✅ New free spins mode with an unlimited win multiplier on every win
Indiana Jones isn't the only lover of ancient Egyptian treasures as players love stepping back into the tombs of the past. From desert sands to abandoned tombs, to gods and forgotten royalty; Egypt hides many secrets to enjoy. Grab your adventurers hat and check out some of the top titles including:
Eye of Horus - Blueprint
Eye of Horus, and its Megaways counterpart, stand as some of the most popular Egyptian-style slots in the online gaming scene. Featuring up to 20 available paylines and 50,000x your total bet in real cash prizes, there's plenty to enjoy including:
✅ 96.31% RTP & Medium volatility
✅ Free spins mode with upgradeable Wild symbols
✅ Sequels including Megaways and Jackpot King variants
Before there was Book of Dead, Book of Ra was innovating the slot game with the special 'Book of' bonus feature. Upgrade the experience in Book of Ra Deluxe with the following improvements:
✅ 95.10% RTP (Up from 92.53% for the original)
✅ 10,035x max win (Up from 5,000x for the original)
✅ Multiple bonus games including free spins and a 50/50 win gamble feature.
One of the most popular Egyptian titles since its release in 2012, Cleopatra has retained its cult status due to its accessibility and easy gameplay loop. Discover why the queen of Egypt rules the scene including:
✅ 95.70% RTP & Medium volatility
✅ Free spins mode with all wins tripled for the duration
✅ 8+ Cleopatra titles including sequels and progressive jackpot variations
There are thousands of slots available and no two are exactly alike. Get familiar with the game's mechanics, payouts and bonus features to figure out what works best for you. Don't be afraid to walk away if the game doesn't fit your tastes.
Consider your bets
Your betting behaviour can have a massive impact on your playing experience. Find the right balance between budgeting to play responsibly and seeking those bigger wins when the time is right. Ensure you always play within your means and only up your bet values when you feel comfortable.
Practice with free games
Playing with free games allows you to test out a variety of games available at top UK slot sites. Playing for free gives you the chance to learn and get comfortable with a game without the risk of losing money.
Take advantage of bonuses and promotions.
Grabbing bonuses and promotions is one of the most lucrative elements available at online slot sites. Take advantage of promotions like no-deposit deals, first-deposit bonuses, or free spins to get the most of your online casino sign-ups.
Understand RTP & Volatility
When selecting a game to play, it is important to understand the maths behind the game. Check out the top slot sites to see what high RTP games they offer to maximise your potential winnings when you spin for real money.
Choose a top UK slot site
Choosing the right UK slot site for you will have a substantial impact on your playing experience from your first day and far into the future too. Using our casino reviews can help you with this and using our recommended casinos are guaranteed to provide an impeccable experience for players.
Other casino games
Blackjack
Play blackjack for fun with more than 35 free blackjack games on this page. Play variants like double exposure and multi hand blackjack instantly.
💰RTP: 99.5%
⭐Popularity: High
📈 Difficulty: Easy
🎲 Popular games: Multihand Blackjack, Blackjack Switch, Spanish 21
The basic concept of slots is to spin the reels and match up the symbols along paylines to win. When you're playing slots online at any of our top online casinos, you can find the instructions on how to play in any game's paytable options.
Can I play slots for free?
Yes. Most online slots sites will offer players the option to play some free slot games. This means you won't have to deposit any money to get started, you can simply enjoy the game for fun. Keep in mind that playing free slots does not allow you to play for real money; meaning any winnings are purely for fun.
What should I look for in an online slot casino?
After security and legitimacy (there are unfortunately a lot of rogue online casinos out there) you want to look at the payout percentage of an online slot. This is the percentage of the wagers paid in that the casino pays out in winnings. This is especially important if you're planning on playing for real money. A higher payout percentage generally means more money back in your pocket.
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. Progressive jackpots include mechanics like WowPot, Dream Drops and Jackpot King.
Can I win real money playing online slots?
Yes you can. All online casino sites offer a wide selection of real money slots winnings can be withdrawn for real cash prizes. Just make sure you play within your means and understand how factors like RTP can affect the total payout potential.
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.
Are online slots rigged?
No, all regulated online slot machines are completely fair. Slot machines are rigorously tested before being assigned an RTP value to ensure that the results are random on each and every spin. To guarantee 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.
Does the amount I deposit at a slots site influence the payout?
Bigger bets have no affect on the chances of winning but can mean you return more winnings when wins are recorded. Paytable values are calculated based on your bet level meaning that wins at a higher bet level will return more cash. Be mindful to always play within your means and only play at high bet levels if your bankroll allows it.
Do people actually win money with online slots?
Of course. People are winning money on slot machines every single day - with some earning big prizes. Every slot that is properly regulated and on the books of a licensed casino has a chance to award cash prizes on every single spin with some slots having top payouts of over 100,000x depending on the results.
Are there specific UK slot site regulations?
As per UKGC regulations, there are several elements of slots that are banned at UK slot sites. For example, Quick Spin and Auto-Play features, which allow for the game to play with little input from the player, are banned on UK slots. Bonus and feature buys are also prohibited.
Aside from these in-game regulations, players cannot use credit card payments to fund their UK slot site accounts as to avoid players gambling with money they might not have.
William Macmaster is a casino expert who has spent his career connecting players from across the world with unforgettable experiences at safe and reliable online casinos. You can rely on him to provide you with the knowledge you need to get more out of your online gambling experience.
Ian grew up in Malta, Europe's online gaming hub and home of top casino regulators and auditors such as eCOGRA and the Malta Gaming Authority. After completing his Master's degree in Glasgow, he returned to Malta and started writing about casinos. He's worked on hundreds of casinos across the US, New Zealand, Canada, and Ireland, and is a go-to authority for Casino.org's team.