Best Online Slots Casinos and Games in the UK 2025

You can hit the reels on thousands of fun and exciting slot games when you join UK casinos. From the most popular slots online to progressive jackpots offering the biggest multi-million pound top prizes, we have everything you need to enjoy the best slots at our highest-rated casino sites.
Our expert slots guide covers:
- The most generous free spins and welcome bonuses for slots fans
- The different slot types and themes available at UK casinos
- Tips on how to find popular slot games for real money
Top Online Slot Sites for UK Players July 2025
Your Expert Guide to Playing Online Slots for Real Money
Slots are the most popular games you can play at UK online casinos. Research released by YouGov in November 2024 revealed that of all gamblers in the UK, 16% (or nearly 1 in 6) had played online slots in the previous month.
There are many reasons why slots at real money casino sites attract lots of players. They’re simple to play and don’t require you to learn any betting strategies, come in a wide range of themes and types to suit all interests and budgets, and often feature exciting bonuses such as wilds, multipliers and free spins.
Perhaps more importantly, slots offer the chance to win considerably larger amounts of money than other traditional casino games. Top prizes often reach thousands of times your bet or multi-figure progressive jackpots that can make lucky winners millionaires.
Play 2,500+ Online Slots at LeoVegas

Few online casinos in the UK can compete with LeoVegas’ immense slots collection. It has over 2,500 to hit the reels on, including exclusive titles from top providers such as LeoVegas Megaways by Blueprint Gaming and Gates of LeoVegas 1000 from Pragmatic Play. There’s also an extensive progressive slots selection featuring LeoJackpot prizes, alongside a range of all-time classics like Big Bass Bonanza, Book of Dead and Starburst.
Slots Expert - Jon Young: “Every time I visit LeoVegas, I can’t help but give the LeoJackpot collection a spin. You can win one of four live jackpots which regularly hit eight figures with stakes of just 10p. Best of all, it covers some of my favourite slots including Sweet Bonanza and Wolf Gold.”
Player Review – Tini Pitihira (LeoVegas): “Great selection of games, great bonuses and super quick withdrawals.”
Sign up at LeoVegasTop 5 Most Popular Online Slots at UK Casinos
If you’re not sure which slot games you should start with, you can see the most played online slots across over 160 UK real money casino sites in July 2025 below:
Rank | Slot | Max. Win | RTP | Available at |
🥇 | Big Bass Splash | 5,000x | 96.71% | LeoVegas |
🥈 | Kong 3 Even Bigger Bonus | 10,000x | 95.00% | Neptune Play |
🥉 | Book of Dead | 5,000x | 96.21% | Duelz |
#4 | Starburst | 500x | 96.09% | Dream Vegas |
#5 | Double Bubble | 20,000x | 96.02% | 888 Casino |
Big Bass Splash – Pragmatic Play

🎰 Theme: Fishing
✅ Four-level free spins bonus with extra wilds and instant cash prizes
✅ Above-average RTP of 96.71% with high volatility
✅ Huge top prize of 5,000x your bet
💰 Best welcome bonus: 50 free spins on Big Bass Splash at LeoVegas
Play at LeoVegasKong 3 Even Bigger Bonus – Blueprint Gaming

🎰 Theme: Jungle
✅ 4,096 ways to win on every single spin
✅ Free spins with progressive multiplier of up to 15x
✅ Four win modifiers and four fixed jackpots up for grabs
💰 Best welcome bonus: 100% up to £100 at Neptune Play
Play at Neptune PlayBook of Dead – Play’n GO

🎰 Theme: Ancient Egypt
✅ Original game in hugely popular Rich Wilde slots series
✅ Double or nothing gamble feature on every winning spin
✅ Free spins with expanding symbols and 1p minimum bet
💰 Best welcome bonus: 100 free spins on Book of Dead and 100% up to £100 at Duelz
Play at DuelzStarburst – NetEnt

🎰 Theme: Space
✅ Win both ways paylines that double your chances to win
✅ Special Starburst symbol turns reel wild with instant respin
✅ Simple yet fast-paced gameplay is great for slots beginners
💰 Best welcome bonus: Up to 150 free spins on Starburst and 100% up to £300 at Dream Vegas
Play at Dream VegasDouble Bubble – Gamesys

🎰 Theme: Classic
✅ Massive top prize of 20,000x your bet
✅ Entertaining ‘Pop the Bubble’ bonus round
✅ High volatility for larger payouts
💰 Best welcome bonus: 200% up to £200 at 888 Casino
Play at 888 Casino
Pro tip from Jon Young, Slots Expert: “The gamble feature is what keeps me coming back to Book of Dead. You can either guess the colour of a random playing card to double your payout, or choose the right suit to boost it by 4x. That means you only need three correct guesses in a row to potentially multiply your initial winnings by a massive 64x!”
Types of Online Slot Games
Top slots casinos in the UK let you hit the reels on thousands of games, but the vast majority fall under one of several common types. Here are the sorts of slots you can expect to find at our top-rated casinos:
New Slots

New slots are added to online casinos on a near daily basis. Playing new slots is a good way to try out the latest features devised by software providers and enjoy recent releases in popular slots franchises, such as the Big Bass and Reel King series. If you’re looking for something different from traditional slots gameplay, new slots are normally the best place to start.
🤩 Popular new slots: Rich Wilde and the Tome of Dead (Play’n GO), Big Bass Bonanza 1000 (Pragmatic Play), Vikings Go to Olympus (Yggdrasil)
Learn more about new slotsProgressive Jackpot Slots

Progressive slots feature a live top prize that constantly increases with every real money bet wagered on the game until it’s won by one lucky player. These jackpots regularly hit seven or eight figures, and often offer the largest cash prizes available across an entire online casino. For instance, a UK gambler won £13.1 million playing the progressive jackpot slot Mega Moolah in 2015.
🤩 Popular progressive jackpot slots: King Kong Cash Even Bigger Bonanza Jackpot King (Blueprint Gaming), Age of the Gods: God of Storms (Playtech)
Learn more about progressive slotsMegaways Slots

Megaways slots were launched by Big Time Gaming in 2015. They use a special reel layout whereby each of the six reels can display anything from two to seven symbols on every spin. Most Megaways slots therefore offer up to a massive 117,649 ways to win, although some such as Rasputin Megaways have nearly three million. Best of all, Megaways games also replace winning symbols, allowing you to land multiple payouts on the same spin.
🤩 Popular Megaways slots: Cash Strike Hotstepper Megaways, The Goonies Megaways, Eye of Horus Megaways (all Big Time Gaming)
Learn more about Megaways slotsHighest Multiplier Slots

High multiplier slots offer the chance to win 100,000x your bet or more, meaning they award the largest payouts relative to your wager size. This is possible because they have in-game bonuses involving huge and progressive multipliers that can significantly boost your payouts, meaning even the smallest bets are capable of landing big wins. They’re often the slots of choice for minimum deposit players wanting to maximise their win potential.
🤩 Popular highest multiplier slots: Tombstone Slaughter: El Gordo’s Revenge (Nolimit City), Starburst XXXtreme (NetEnt), Peking Luck (Pragmatic Play)
Learn more about highest multiplier slotsHigh RTP Slots

The average return to player (RTP) percentage for online slots is around 96%, so any slot with a higher RTP than this can be expected to pay out more money on average. While you may need thousands of spins to notice the benefit, high RTP slots are still popular with players keen to take advantage of the best win rates. Many UK casinos have slot games boasting RTPs of 98% and more.
🤩 Popular high RTP slots: Ugga Bugga (Playtech), Ju Jungle (Casino Web Scripts), 1429 Uncharted Seas (Thunderkick)
Bonus Buy Slots

Certain slot games allow you to buy in-game bonuses such as free spins at any time for a set price, instead of having to trigger them as normal with scatters. However, online casinos were banned by the UKGC in 2019 from offering such games, as there were concerns they encouraged problem gambling. As a result, you can only play versions of these slots with the bonus buy feature removed.
🤩 Popular bonus buy slots: Gates of Olympus (Pragmatic Play), Sweet Bonanza (Pragmatic Play), Money Train 2 (Relax Gaming)
July 2025 Slot of the Month: Gold Cash Free Spins

Inspired Gaming’s Gold Cash Free Spins is one of the most popular online slots at several of our top-rated UK casinos right now, including MagicRed, All British Casino and Betano. The 2020 release has a top prize of 2,500x your bet and an in-game free spins bonus that exclusively features high value symbols.
With bet limits ranging from 20p to £100 per spin, it also suits budget bettors and high rollers alike, while you can take advantage of the gamble feature activated on every win for the chance to significantly boost your payout or earn free spins.
Slots Expert – Jon Young: “Gold Cash Free Spins combines simple and traditional slots gameplay with innovative features that have ensured it’s still going strong in 2025. I’m always excited by the gamble bonus round, which lets you set your own odds so you’re in control of how likely you are to add to your winnings.”
Info & Stats






Gold Cash Free Spins Quick Facts
Popular Online Slot Themes
Certain themes have proved consistently popular with UK slots players over the years, leading to the release of dozens of slot games set within a specific time period or part of the world:
Animal Slots

Many slots are themed around animals, ranging from those you’ll find on an African safari in Mega Moolah to mischievous bulldogs in The Dog House Megaways. Fishing slots are a particularly popular sub-category on this front, with the Big Bass and Fishin Frenzy series among the most popular slots right now at top UK casinos including MagicRed and All British Casino.
🤩 Popular animal slots: Big Bass Bonanza (Pragmatic Play), Buffalo King Megaways (Big Time Gaming), Wolf Gold (Pragmatic Play)
Wild West Slots

There are lots of slot games that take you back to the wild west, with symbols and features based around cowboy and cowgirl outlaws, sheriff’s badges and wanted posters. Often, the reels overlook dusty towns and taverns with upbeat folk-based soundtracks to add to the excitement. Coral has over 15 wild west-themed slots to choose from, including Wild West Bandits and 2 Wild 2 Die.
🤩 Popular wild west slots: Wanted Dead or a Wild (Hacksaw Gaming), Duel at Dawn (Hacksaw Gaming), Wild West Gold Megaways (Pragmatic Play)
Irish Slots

You can spin the reels with the luck of the Irish on your side, with lots of slots starring leprechauns, four-leaf clovers, pots of gold and other icons of Irish folklore. The Irish-inspired Rainbow Riches slots series is available at top-rated casinos such as Betway Casino and Grosvenor Casino, including Rainbow Riches Megaways, which has a massive top prize of 12,500x your bet.
🤩 Popular Irish slots: Rainbow Riches (Light & Wonder), 9 Pots of Gold (Apricot, formerly Microgaming), Shamrock Saints (Push Gaming)
Ancient Egypt Slots

Ancient Egypt is one of the longest-running slots themes, after initially proving popular at UK casinos with iconic games such as Book of Ra (released back in 2005) and Cleopatra (2012), which are both still among the most played slots by Brits. Today, it’s still going strong thanks to the likes of the Rich Wilde series, which provides fun slots based around pyramids and temples, Egyptian gods, hieroglyphics and more.
🤩 Popular Ancient Egypt slots: Legacy of Dead (Play’n GO), Book of Ra Deluxe (Novomatic), Legend of Cleopatra Megaways (Playson)
Ancient Greece Slots

There are dozens of online slots set in ancient Greece, featuring symbols and bonuses based around mythical gods such as Zeus and Athena. Among the most popular at UK casinos is Pragmatic Play’s Gates of Olympus series, which has spawned numerous spin-offs such as Gates of Olympus 1000 and Gates of Olympus Super Scatter. Age of the Gods by Playtech is also a beloved progressive jackpot title with slots fans.
🤩 Popular ancient Greece slots: Gates of Olympus (Pragmatic Play), Book of 99 (Relax Gaming), Age of Athena (G Games)
Horror and Gothic Slots

If the likes of ghosts, vampires and dark fantastical characters are your thing, you’re spoilt for choice with the gothic-inspired slots available at UK gambling sites. Many of these boast above average RTPs and maximum wins, most notably Immortal Romance (96.86% RTP and a top prize 12,150x of your bet) and RIP City (96.22% and 12,500x). Software providers such as Hacksaw Gaming specialise in horror-themed slots.
🤩 Popular horror and gothic slots: Immortal Romance (Apricot, formerly Microgaming), RIP City (Hacksaw Gaming), Madame Destiny (Pragmatic Play)
Top 5 Online Slots with Highest RTP
While you can’t guarantee winning spins when you play online slots, you can take advantage of the best win rates and expected returns on high RTP games. Here are the top five slots with the best RTP rates at UK casino sites:
Rank | Slot | RTP | Max. Win | Available at |
🥇 | Book of 99 | 99.00% | 5,000x | LeoVegas |
🥈 | Mega Joker | 99.00% | 2,000x | Luna Casino |
🥉 | Treasure of Tengshe | 98.94% | 4,190x | Coral |
#4 | Jackpot 6000 | 98.90% | 6,000x | All British Casino |
#5 | Gold Digger: Mines | 98.88% | 8,230x | 888 Casino |

Pro tip from Jon Young, Slots Expert: “Another brilliant addition to Relax Gaming’s ‘Book of’ series, the ancient Greece-themed Book of 99 boasts a very high 99% RTP. There’s also bonus rounds with expanding symbols and high volatility, meaning you can look forward to bigger payouts when they do land. With a upper bet of £100 per spin and max win of 5,000x your stake, high rollers can play for the chance to win up to £500,000.”
Top Tips for Choosing Your Perfect Online Slot
There are several things you can do to ensure you have a fun casino slots experience. Follow our tips to help find the most enjoyable online slot machines for you:
Try free slots first: You can play free slots to try out games and see if you like them without needing to risk your cash. This is also a good way to learn more about how a slot and its features work, so you know exactly what to expect from the reels when you play for real money. Many UK casinos allow you to play free casino games including slots.
Test your favourite slots on mobile: If you regularly play at mobile casinos, we suggest checking out top mobile slots to enjoy games that are optimised for your smartphone. These days, software providers produce slots using HTML5 technology, meaning they load quickly and run with high-quality graphics on mobile gambling sites and casino apps.
Consider the RTP: All online slot games have a RTP rate, which dictates how many money the slot will pay out from £100 worth of bets on average. That means you can play slots with a higher RTP above the 96% standard to get expected better returns.
However, it’s also important to note that some slots (such as Big Bass Splash and Blood Suckers Megaways) have different versions with varying RTPs and may allow the casino to set the RTP. Therefore, you should check this information for a slot at a casino if it’s provided to ensure you’re getting a favourable RTP percentage.
Take advantage of free spins and slots bonuses: There are numerous casino bonuses you can claim to get extra chances to win at online slots. Dozens of top UK casinos offer free spins promotions, both as welcome bonuses for new players and reload promotions if you already have an account.
Some casinos even have no deposit free spins that offer the chance to win real money playing slot games without needing to deposit any money whatsoever.
Pro tip from Jon Young, Slots Expert: “Something I like to do is check websites for software providers to see if there any upcoming slots being released in series that I like. Often, they will provide information such as the theme, RTP, max win and volatility for a slot before you can play it at casinos, meaning I’ll already know if I’m likely to enjoy it by the time it’s available.”
Why Should You Only Play Regulated Online Slots?
Every time you play online slots, you should ensure you’re using casino sites licensed by the Gambling Commission (UKGC). These casinos only have games from the UKGC’s register of approved software providers, which have been tested and regulated as producing slots that use reliable RNG technology.
However, non-UKGC casinos can clone and advertise slot games from approved providers in order to appear legit, which can make it tricky to tell if an online casino is safe. That’s why to help you out, Casino.co.uk only features UKGC-licensed casinos that provide trustworthy gambling platforms.
Top Online Slot Game Providers
There are numerous software providers that produce slot games, which is part of the reason why there are so many to choose from at online casinos and new slots are released on an almost daily basis. All of the providers at licensed casino sites are also UKGC-approved, meaning their games have been tested and verified as using fair RNG technology.
Our in-depth guides to top slots providers cover the best games they have produced, which casinos you can play them at and why their slots are popular with UK gamblers.

Apricot (formerly Microgaming) has produced 5,300+ games across over 30 years, including Immortal Romance and Mega Moolah.

Playtech are slots specialists with games boasting unique features and high-quality graphics. They also produce table and live casino games.

Amaya’s games portfolio spans more than 300 games, giving players flexibility across slots, poker games, sports betting and much more.

Aristocrat has released slots for online casinos in over 90 countries. Its popular releases include Queen of the Nile and Sons of Anarchy.

Few software companies match Betsoft for games variety, having produced slots, table titles, video poker, virtual sports and scratch cards.

IGT’s diverse and ever-growing portfolio of 550+ games includes titles with huge top prizes and wide betting limits to suit all budgets.

Novomatic is an innovative casino software provider with decades of experience in producing games such as Book of Ra: Magic.

Slots fans have likely played a NetEnt release. The range of over 200 titles includes high RTP games such as Gonzo’s Quest and Mega Joker.
Frequently Asked Questions
How do you win at online slots?
Online slots are games of chance, so there’s no way that you can guarantee a winning payout on any spin. However, by playing slot games with an RTP above the 96% average and lower volatility, you can expect to win more money over the long term and land more frequent payouts.
Are online slots rigged at UK casinos?
No, so long as you’re playing slot games at UKGC-licensed online casinos. These are provided by approved software producers and use random number generators (RNG) which have been independently tested and approved by companies such as eCOGRA and iTech Labs as providing fair and unbiased outcomes.
When is the best time to play online slots?
Simply whenever it most suits you to play slots online. The time of day you play games has no impact on your chances of winning real money, as every spin is random and prizes such as progressive jackpots can be traiggered at any time.
How you can win big at online slots at UK casinos?
To improve your odds of landing larger payouts, you can place bigger bets on every spin and play high volatility slots, which tend to pay out less often but are more likely award big wins as a result. However, you should still gamble responsibly and consider your budget with every slot game you play.
What online slots pay real money?
Any online slot at our featured casinos will pay out cash if you place a real money bet on the game and land a winning spin. On most slot types, winning combinations involve three or more matching symbols on the same payline.
