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Gold Blitz Extreme Fortune Factory Studios
Good RTP Value Highest-Rated Game Amazing Features
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Candy Paradise Oros Gaming
Excellent Gameplay Good Bet Range Free Spins Feature
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Hermes Bonanza Wishbone
Crazy Maximum Prize Fun Game Theme Many Betting Options
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Book of Dead Play n GO
RTP of 96.21% Free Spins Round High Jackpots
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Wolf Gold Pragmatic Play
RTP of 96.01% Players Favorite Free Spins
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Gonzo's Quest NetEnt
RTP of 96.00% Falling Symbols Mega Multipliers
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Bonanza Megaways Big Time Gaming
RTP of 96.00% 117.649 Ways to Win Bonus Bet
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Immortal Romance Microgaming
RTP of 96.86% Amazing Gameplay Achievements
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Mega Moolah Microgaming
RTP of 88.12% Millionaire Prizes Bonus Wheel
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Book of Ra Deluxe Novomatic
RTP of 95.1% Bonus Game Gamble Feature
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Best UK Slot Sites in 2024

Whether you’re a newbie to online slots 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, gamble features, new mechanics, and best bonuses. You can also leave a comment to let other people know what do you think of a specific game on our list. 

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Best For
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  • Editor's choice
Best For
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  • Low wager
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Best For
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Best For
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Best For
  • Latest & Greatest Games
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Best For
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Best For
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Bonus Code CURSE40
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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

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

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 a variety of bonus features which include: big win symbols, a jackpot game, and a gamble feature.

All British Casino

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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.

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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, a Feature Drop.

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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 like 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 means 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.

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

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 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.

Mobile Slots

Playing games on your mobile makes for an easier experience all round. 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?

Free spins are a set number of spins that a player can make without needing to bet with their own money. They may receive 10 free spins as part of a bonus, for example, and they can use those free spins to play a certain game without needing to stake their own money.

What best slot machines have the highest odds?

When looking for the best odds of winning, you want to find the slot with the best RTP. This is the Return to player. Basically, it's a percentage value that shows how much you would get back for every bet statistically. You're not guaranteed to get that same amount all the time, but as a general rule a higher RTP is a higher chance of winning. There isn't a special trick to winning, but a higher RTP is a safer bet.

Which best online slots have the best RTP?

Some slots generally average around 96% RTP, but some can go as high at 97-98%! 

What kind of slots are the top online slots?

Although all slots follow the same premise of spinning to match symbols, there are variations in online slots. Video slots are almost like a videogame, and have interesting effects and game play. Classic slots are more similar to what you'd find in your everyday casino. Jackpot slots take a percentage of each stake, from every site that they're found on, and put it together into a cumulative jackpot which any player has a chance to win.

Which online slots payout the most?

Without any doubt, Mega Moolah, Mega Fortunes and Megabucks.

What are the best slot machines to play in a casino?

The best slot machines to play at the physical casinos are 88 Fortunes, Book of Ra deluxe, Bubble Craze, Lady Robin and Gold Fish. When it comes to online casinos, Gonzo's Quest, Book of Dead and Mega Moolah.

When is the best time to play the best slot machines at a casino?

This is a myth. There's not the best time to play online slots or physical slots. However, playing while many other players are playing, is usually good as the slots keep being warm.

Where can I play Bier Haus slot online free?

There is a bunch of casinos where to play Bier Haus slot online free! We suggest you to play it on 888, Unibet, William Hill and LeoVegas.

How to win the best online slot games?

First of all, read the rules and make sure you understand the payment symbols and paylines. Second, keep a low bet (at least to start off), and check if the game is warm. Make sure the game has an RTP of above 96% and read the reviews of other players to know tricks and insights.

What are the best online slots to play for fun?

The best slot machines to play for fun are Book of Dead, Gonzo's Quest and Starburst.

Robin Storm
Author & Casino Games Expert Robin Storm verified symbol
Always looking for the best and latest games that hit the market, Robin works hard to make gambling fun and worry-free for all players. His years of experience working in the industry allows him to research and write about all the online slots' do's and don'ts. So if you have any doubts about new slots and table games, Robin's articles will answer all your questions about RTP, Volatility, Themes, Gameplay and so much more. He is very passionate about being able to play casino games in a fun and safe environment and he is enthusiastic to share how to play the most popular games at your favourite online casinos and avoid all the hassle in his articles.
Expert On: Safe Gaming Land-based Casinos Online Slots Table Games Live Casino Games Megaways Slots Megaclusters Slots
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Reviewed by Julia Attard

Senior Author With experience in content management, Julia is passionate about creating content for the English-speaking gaming markets of CasinoTopsOnline. When she isn’t working, you’ll find Julia reading a book on the beach, watching sports or baking something in the kitchen! Read More