Best Online Slots UK

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Robin Storm
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There are hundreds of slots ranging from classic fruit machine games to the latest video slots available in online casinos for you to choose from. Below are the top 10 must-play slots online for May 2024 ranked by our team of online slots experts. Remember you can play all these top slot games for free on our website, without risking your money. If you run out of credits, just refresh the page to receive new ones.

18+ new players only. To be eligible for the welcome offer, a minimum deposit of £10 is required. Bonus is valid for 30 days. To bonus comes with a 35x wagering requirement which must be met within the first 60 days from when the bonus was activated. The bonus will be paid out in 10% increments. Play responsibly Full terms and conditions apply
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Gold Blitz Extreme

RTP: 96%

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Candy Paradise

RTP: 96.02%

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Hermes Bonanza

RTP: 96.22%

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Book of Dead

RTP: 96.25%

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Wolf Gold

RTP: 96.01%

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Gonzo's Quest

RTP: 95.97%

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Bonanza Megaways

RTP: 96%

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Immortal Romance

RTP: 96.86%

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Mega Moolah

RTP: 88.12%

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Book of Ra Deluxe

RTP: 95.1%


Best UK Slot Sites in 2024

Whether you’re a newbie to online slot games or you just played some free slots and are looking to find the top online casino slots, below, we have reviewed the best games on the market. Pick the best online slots with the biggest jackpots, free spins, gambling features, new mechanics, and best bonuses. You can also leave a comment to let other people know what you think of a specific game on our list. 

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How We Rate
Last Updated • April 2024

Which Are the Best Payout Online Slots?

The payout percentage is the average amount of money the slot will pay back to the players. We have tested hundreds of best online slots to figure out the very best according to their payout. According to our game reviewers, here is a list of the best 10 payout slots.

Top Payout Slots Provider Payout Percentage (RTP)  Volatility
Book of 99 Relax Gaming 99% Medium
Ohh Ahh Dracula Barcrest 99% High
Jackpot 6000 Netent 98.75% High
1429 Uncharted Seas Thunderkick 98.6% Medium
Tropic Reels Playtech 98.5% High
Joker Strike Quickspin 98.11% High
Moon Shadow Barcrest 98.1% High
Blood Suckers Netent 98% Medium
Starmania NextGen 97.87% Medium
Golden Tour Playtech 97.71% High
Pile 'Em Up Frosty Sweets Snowborn 96.22% High
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There are plenty of real money slot options for UK players to play at the casinos licensed by the Gambling Commission. With some of the top casinos in the online casino sphere operating in the UK, they can be guaranteed a safe, secure, and fun experience and some of the top slots with the best gameplay. With bonuses available in many UK online casinos and stringent regulations from the UKGC, you're guaranteed to have a good time.

Best UK Slots Provider RTP Volatility
40 Super Hot EGT 95.81% Low
Big Bass Bonanza Pragmatic Play 96.71% Medium
Fruit Party Pragmatic Play 96.50% High
Lucky Leprechaun iSoftBet 95.76% Medium
White Rabbit Big Time Gaming 97.72% High
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40 Super Hot (Euro Gaming Technology)

  • Reels: 5

  • Paylines: 40

  • Bet Range: £0.40 - £ 100.00

  • RTP: 95.81%

  • Volatility: Low

40 Super Hot Priview

Developers at EGT know very well that there is still value in classic online slots with more simplistic gameplay. 40 Super Hot is a fun online slot that comes with 5 reels and 40 fixed pay lines. Prepare to enjoy smooth gameplay where winning combinations are set alight on your reels. The slot offers various bonus features, including big win symbols, a jackpot game, and a gamble feature.

Fruit Party (Pragmatic Play)

  • Reels: 7

  • Paylines: Cluster Pays

  • Bet Range: £0.10 - £ 100.00

  • RTP: 96.5%

  • Volatility: Medium

Fruit Party Slot Preview

Fruit Party is a funky video slot that features a 7x7 grid screen with a total of 49 blocks. This relatively new game has been received extremely well in an online gaming industry that is hungry for new concepts. The game features a cluster pay system where 5 or more matching symbols, touching horizontally or vertically, form a winning combination. The game comes with some great bonus features including the random multiplier making the gameplay more thrilling.

White Rabbit (Big Time Gaming)

  • Reels: 5

  • Paylines: 248,382

  • Bet Range: £0.10 - £ 20.00

  • RTP: 97.72%

  • Volatility: Medium-to-High

White Rabbit Slot Preview

Big Time Gaming has gone to extensive lengths to create a forward-thinking online slot machine, White Rabbit Megaways, based on the popular tale of Alice in Wonderland. Uk players can potentially win up to 17,420x their stake in this slot game, and it's stuffed with bonus features including: many Caterpillar Wilds, a good amount of Down the Rabbit Hole Free Spins, and a Feature Drop.

New Slots

With new games being put out every week - which are some of the latest slots you can take for a spin? Here's a few to highlight below.

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Amazing Link Frenzy

RTP: 96.48%

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Big City Cash

RTP: 96.01%

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3 Lucky Hippos

RTP: 96%

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Joker Loko's Multiplier Trail

RTP: 96.13%

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Treasure Ireland

RTP: 96.16%

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Rainbow Ryan 2

RTP: 96%


Different Types of Slots

Picking the type of slot you want to play can make all the difference - each player has a set of specific criteria for their gameplay, or a play style that they prefer. 

Slots By Theme

When it comes to designing a game, providers want it to be fun, appealing, and nice to look at. That comes down to the music, the visual design, and the gameplay symbols. The theme is what encompasses all of this - so whether you want to spin the reels on a marine pirate-themed slot, or uncover potential riches in an adventure-themed slot game, there are plenty of different theme options to pick from.

Slots By Reels

The number of reels on a slot can vary from your classic three-reel slot similar to fruit machines, or go as high as 5 or 6 reels to increase the paylines available during your game. Players who prefer a classic slot game would opt for smaller numbers or reels, but higher numbers of reels might lead to greater volatility and potential numbers of outcomes.

Slots By Payline

Payline numbers can vary in slot games - keep it simple with a few options or increase the number for more ways to win. Picking a slot by payline options means there are a few more options when it comes to hitting a winning spin. A few slots only have a few select ways to win, while others will let you have thousands of potential lineups for winning symbols, as well as options for wilds symbols and more.

Slots By Volatility

  • Low Volatility Slots

  • Medium Volatility Slots

  • High Volatility Slots

What is slot volatility? The volatility of a slot is how the symbols on the reels are to change with each spin. So a greater variety of slot symbols means a higher potential number of wins, whereas a lower volatility slot will potentially mean a more consistent number of lower-value wins.

Slots By Features

  • Wilds

  • Scatters

  • Free Spins

  • Multipliers

  • Bonus rounds

Each slot game comes into its own when you actually get down to playing. Each one will have its own great gameplay style, such as giving players scatter or wilds features which launch the symbols across the reels, or bonus rounds which give players free spins. Given these can totally transform slot gameplay, they're worth factoring in for your slot choice!

Best Slot Providers

Although the selection of slot games is ever increasing, the best online casino software provider sets one casino slot apart from another. Some experienced players target the software providers' games that they enjoy most, while others may prefer to try virtually all slots online in one place. Luckily, there are plenty to choose from.

NetEnt Slots and Casinos


NetEnt is an award-winning provider in online casinos, producing many firm favourites of gamblers.

IGT Casinos and Slots

IGT (Wagerworks)

IGT is one of the world’s largest slot machine manufacturer and land-based casino provider.

Pragmatic Play Casinos and Slots

Pragmatic Play

Pragmatic Play, a software developer that puts simplicity first, has become a casino favourite.
Playtech Casinos and Slots


Playtech has become one of the most renowned online gambling providers in the world.

Microgaming Casinos and Slots


Microgaming is the world’s largest offering over 850 casino games and two new titles every month.
Play'n GO Casinos and Slots

Play n GO

Play’n GO have created a large range of high-quality games available in 30 different languages.

The Best Free Slots at CasinoTopsOnline

With many online slots to choose from, we have ranked 10 of the best online slots according to their best features. Find the list below and click on the slot name to be redirected to the slot review page:

Best For... Game Provider
🎰 Best for the jackpot Mega Moolah Microgaming
🎲 Best for payout Rainbow Riches Gamesys
💎 Best for variance Big Bass Bonanza Pragmatic Play
⚡ Best for features Money Train 2 Relax Gaming
💳 Best for betways Bonanza Megaways Big Time Gaming
🤵 Best for mini-game Chicken Game Pragmatic Play
📋 Best for graphics Book of Dead Play 'n GO
🏆 Best for music Reactoonz 2 Play 'n GO
✔️ Best for high-rollers 88 Fortunes SciPlay
🚀 Best for our team  Wolf Gold Pragmatic Play
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Mega Moolah

Mega Moolah is a popular progressive jackpot slot based on a wild African safari by developed by Microgaming. This fun animal-themed slot features the beautiful wild beasts found on the plains of Africa. The game is set on 5 reels and offers a total of 25 paylines. This video slot is a medium volatility slot with many chances to be a winner.

Rainbow Riches

From the studios of Barcrest comes the famous Irish-themed slot, Rainbow Riches. Taking you to the luscious hills of Ireland, the lucky Leprechaun takes you on a quest to find the missing pot of gold. The game includes three fantastic bonus rounds, each of which offers the potential for great rewards and helps maximise your wins. The game does need some modernisation of the overall graphics but all in all,  this online slot machine continues to prove to be one of the UK's favourite online slots.

Big Bass Bonanza

Pragmatic Play's major hit, Big Bass Bonanza, will give you a new gaming experience on a 5-reel layout, with lots of prizes to catch and a total of 10 paylines. With an RTP of 96.71% and a maximum jackpot of x2,100 of your original wager, this game surely stands out to be one of the best.

Money Train 2

Money Train 2 is a 40 payline slot game by Relax Gaming that features a steampunk meets Cowboys-style theme. The game offers two rich bonus features: the Respin Feature will have you hoping you don't win, while the Money Cart Bonus Round could turn 5 reels into 7 reels for massive payout potential.

Bonanza Megaways

Bonanza Megaways is a 117,649 ways slot that takes you on a fun mining adventure in search of valuable gems and gold. This game pays out when you get 2 or more matching symbols on consecutive reels, with explosive effects from the game's dynamite wilds. But the biggest money comes from the free spins feature, in which the free spins keep on coming and those win reactions come with increasing multipliers.

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Mega Moolah

RTP: 88.12%

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Rainbow Riches

RTP: 95%

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Big Bass Bonanza

RTP: 96.7%

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Money Train 2

RTP: 98%

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Bonanza Megaways

RTP: 96%


Mobile Slots

Playing games on your mobile makes for an easier experience all around. You can play on the go - so you're not stuck to just playing on your desktop computer - and there are often dedicated games or sites for your mobile. Most game providers have kept this in mind now, with games being made on HTML5 and which are mobile-ready from the beginning. This includes features like:

  • Designs meant for a smaller screen, so it's easier to read

  • Larger buttons for tapping on your mobile

  • Adaptable games for any screen size

Playing mobile slots is how many online gamers prefer to make a spin, so as a result the top UK mobile slot games remain popular for a reason.

Understanding RNG

The RNG is the "random number generator" - every spin has a randomly decided outcome when you hit the button to start the game. This keeps the outcome of the game fair as it isn't predetermined, and is entirely reliant on the outcome of this generator. The RNG is tested by third parties and officials to ensure it's fair.

Understanding RTP

The RTP is the potential amount a player could hope to get back if they played for a very long time. It's a general indication rather than a specific amount, but is good to gauge more or less what your likelihood is of getting wins back. 

Each of our slot reviews states the max win available and the combination of wager amount and symbols which you’ll need to aim for to achieve this. Although it's obviously not guaranteed, it's great for an indicator.

So, for example, if a game has a higher RTP percentage of 96%, you could assume that if you play £10, you would get 96% of that - £9.60 - back over a very long time, theoretically.

How to Choose the Best Online Slots Site in the UK

Slot games for UK players have to be top-quality - whether you want a classic slot experience or to try a brand new video slot game, picking one that caters to UK players is best for making sure you get great value on your game, a third-party verified fair system, and more. 

There’s a massive variety of best online casino slots regularly being launched in the industry. It’s important to us that we review these based on several key factors. We write reviews based on this - so here are a few key criteria to keep in mind when making up your own mind on which to pick.

Mechanics of the Game

We’ll tell you the min/max stakes you can wager, the number of bet levels, paylines and reels. We’ll also let you know the combinations to watch out for that will deliver those all-important wins. As well as our opinion on the in-game bonus features and how well the slot works on a range of mobile devices. 

Theme and Soundtrack

We take into account both of these important slot game factors. An annoying and repetitive soundtrack can either make or break your session, so we’ll always let you know our honest thoughts on this. As well as the type of slot theme and the quality of the symbols and overall graphics.

Huge Jackpots

Having a bunch of slot machines lined up together will pool the collective losses into a communal jackpot, making one lucky player very happy once the pot hits! Best online gambling sites offer progressive jackpot slots, and often the jackpot is put together by players across many of the best casinosmaking for huge winnings!

You can find different types of jackpots when playing the best online slot games to win: local jackpots, network jackpots, fixed jackpots, and progressive jackpots. The best one for winnings is the progressive jackpots, which could reach a massive amount of money.

Several Wilds Symbols

Wild symbols can switch up your game - a wild symbol can replace any other symbol in play; they can line up combinations you would not have otherwise! When lining up your symbols on the reels, wild symbols can let other symbols work together for set wins or trigger their special rounds, depending on the game's rules.

Fun Bonus Games

Bonus games bring a secret extra twist to the best casino slot games. Sometimes, you'll spin symbols that trigger an extra round or a new gameplay mode. For example, a bonus round might start with the correct symbols that multiply your win or give you a certain number of free spins to add to your total.

Free Spins Games

Free Spins allow players to give their slot game an extra level of fun without needing to spend any more money. Trigger free spins round, and you'll be treated to a certain number of spins on the game, sometimes in a particular bonus round that is added onto your current spin. 

Anything you win in the free spins round gets added to your win total, no matter your initial stake. 


Some slot-focused casinos will design offers based solely on online slots and give players a selection of slots. This section will delve into the best casino bonuses for online slot enthusiasts. Keep in mind these bonuses won't be available to be played with every casino game. 

We recommend you read the terms and conditions of each promotion before playing:

Best Slot Online FAQs

Should you play or not the best slots online? Well, we could debate this for ages without finding a proper answer. It's all about the player and very personal. Some people don't like playing mainstream slots games, while others love it. If you've got more questions about them, check out our FAQ below.

What is a free spin in the best online slots? Arrow
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Robin Storm

Robin Storm

Author & Casino Games Expert

869 Articles
Robin works tirelessly to make gambling fun and worry-free for all players. With his impressive industry experience, he is passionate about being able to play casino games in a fun and safe environment, ensuring players avoid all the hassles that may appear.
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