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The Definitive Guide on the Best Online Slots in UK

Last update
October 31st, 2023
Wagering Advisors Editorial Team
Whatever type of slot games you prefer you can play them safely and enjoy the best gaming experience. Our guide tells you everything you need to know about online slot games in the UK.
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Table of content

Best UK Online Slots of 2024

# Online Slot Game Provider RTP %
1 Age Of Gods Playtech 95.02
2 Mega Moolah Microgaming 94.00
3 Starburst NetEnt 96.59
4 Book Of Dead Play’n GO 96.21
5 Book Of Ra Novomatic 95.00
6 Crazy Monkey Igrosoft 96.00
7 Thunderstruk II Microgaming 96.65
8 Gonzo’s Quest NetEnt 96.00
9 Vikings Go Wild Yggdrasil Gaming 96.30
10 Mega Fortune NetEnt 96.60

Best UK Online Slot Sites To Play In 2024


With 19 software providers, Playojo should be one of the most primary casinos where you can play the best online slots! After registering an account and before you deposit money, you receive 50 free chances that you can use to test the games! All transactions are processed through an SSL layer of encryption, so you are 100% safe!


Since its opening in 2009, Mr.Green has been one of the best destinations for all players who like high-quality games! Enjoy video slots, progressive jackpot slots and many other different types that will keep you entertained for hours! In addition, there are a few classic titles. These are Starburst, Gonzo’s Quest and Beanstalk.


888 casino offers themed-slots with the ability to earn comp points on every bet that you place! Whenever you place a bet in slots game, you will receive the comp points that you can later convert to real cash or into the free chances that you can use for further free play.

Casino Joy

Casino Joy offers more than 1,000 different slots titles, which makes it one of the best places for players that prefer high-quality slots. You can enjoy video slots, progressive and classic slots from some of the most influential and most recognized software providers.

Video Slots

Among all the online destinations, there is one place that has the biggest collection of best online slots games. Video Slots are the Holy Grail to all players who want to enjoy 5-reelers, 3-reelers and specially themed games where you hit the reels! These include Dark Knight Rises, South Park, Playboy and Jurassic Park! Apart from the vast games’ collection, there is also a wide range of banking methods


Casumo stands for one of the operators that offer the largest collection of best online slots as there are 1,950 slots that you can choose from! All players that register receive 30 free chances that they can use however they want! If you win some cash with them, you can cash it out really fast with under one hour withdrawal option.

All British

All British offers a decent amount of the best online slots games, including some of the odd forms like Blood Suckers and Creature From The Black Lagoon, which is one of the rarest games that you can find! Enjoy 5-reelers, 3-reelers and progressive jackpot slots! Also, try Scarface and Alliens.


Hippodrome delivers some classic 3-reelers like Jingle Bells, Spell Bound, Happy New Year, Break Da Bank, Legacy and Couch Potato, but also a lot of other exclusive slots that are only available in this place. Explore the different themes, ranging from animals, luxury, romance and sports!

How Online Slots Gaming Has Developed

Playing slots online is relatively new. In order to fully appreciate casino slots online development, you have to go back in time and study the timeline to understand how gambling in ancient times has morphed over the centuries into the internet gambling UK players are offered today.


The earliest form of gambling goes back to ancient China following the discovery of tiles which were used in some sort of keno game. Then around 500 BC the Egyptians and Romans were known to play dice games.

But you have to fast forward to 1891 when Messrs Sittman and Pitt of Brooklyn, New York created a gambling machine, followed in 1895 by the “Liberty Bell” machine developed by Charles Fey of San Francisco.

In 1976 the first video slot was invented and in 1994 Microgaming launched the first online slots site.

How Do Online Slots Work?

Some online machines look very much like a traditional, mechanical machines, but being online, they function quite differently. Whereas traditional machines used reels that were driven by electric motors online machines are basically video machines driven by computer software via a random number generator, which explained a little more below.

The original mechanical machines had three spinning reels whereas today the most popular online slots machines have five reels (some machines have seven reels and more) which include things like multipliers, scatters, wilds and expanding wilds which create far more in the way of paylines and payouts in multiple directions.

Online Slots Games in the UK

Of all online slots available in the UK, some will become classics like Starburst and Gonzo’s quest whereas others fall into obscurity once UK players tire of them. But the wide range of top UK slots is so diverse, that players can always find something new. 3-reel, 5-reel, themed games, cult classics, movie-based games, 3D games, and progressives where players get the opportunity to win millions of pounds.

The ability to play the best UK online slots on mobile devices has also gained enormous popularity, affording players the opportunity to play as and when they like even while they’re on the move.

Playing Slots Online in Safety

Being able to play in a safe, reliable environment is key. All UK online casinos can only work here in the UK if they are licensed and regulated by the Gambling Commission.

The UK Gambling Commission (UKGC) runs a tight ship and casinos wishing to gain a UKGC license must demonstrate that they offer services in accordance with gambling industry best practice, that their websites are properly encrypted, and that all online slots they offer are fair.

Slot Games Online and RNGs

All UK slots online are driven by RNGs. These initials stand for “Random Number Generator” and these are devices that determine the outcome of any spin on all of the top slots online.

There are a number of independent agencies that check out and certify the accuracy and reliability of the RNGs that casino platforms use. These agencies include the likes of Compliance Testing Laboratories, eCOGRA, Gaming Associates, and Gaming Labs International.

As well as checking out the fairness of RNGs, these agencies also verify the accuracy of RTP claims.

Various Types of Slot Machines

Gamblers who bet over the internet have different tastes and preferences in the games they like to play. Software providers respond to players’ needs by designing various types of games and the UK online slots list is ever growing. The main types of games include:

Branded Online Slots Games

As can be gleaned from the name, “branded online games” are licensed games that centre on universally popular subjects including blockbuster movies, bestselling books, popular TV shows, and music. They often involve a celebrity figure in the branding to entice players to spin the reels. Examples of branded online games include:

  • Dark Knight from Microgaming
  • Ghostbusters from IGT
  • Gladiator from Playtech
  • Guns N’ Roses from NetEnt
  • Jurassic Park from Microgaming
  • Kong from Playtech
  • Rocky from Playtech
  • Vikings from NetEnt
  • Who Wants to Be a Millionaire from Ash Gaming

Thanks to their ever-growing popularity, the list of branded games is getting longer and longer all the time and you’ll find all the games listed here on our website.

Penny Machines

When games you can play for one penny were first introduced by casino websites they took the industry by storm. They were just about the cheapest form of entertainment you could get anywhere.

But they were originally introduced, before online gaming was even conceived – mechanical one arm bandits or fruit machines could genuinely be played for one penny. They still can today although with modern web-based gaming technology, and with the introduction of variable paylines, that one penny bet can be applied to as many paylines as the machine offers.

Slot Machines with Progressive Jackpots

Rather than having a fixed jackpot, the prize money of top slots online with progressive jackpots increases every time someone plays the machine.

There are two types of progressive jackpots, local and global. Local progressives are machines linked within one specific online casino. Global progressives are online machines all over the world linked into one central jackpot pot that accumulates every time a player somewhere spins the reels.

While local progressives offer huge payouts in the tens of thousands of pounds, progressives offer multi-million-pound payouts.

Video Slot Machines

When you play games on the Web today, they are all powered by videos. That’s the way that the technology works. However, people still refer to regular and video games. When they do so they are talking about games that mimic the old mechanical one arm bandits, or fruit machines as they used to be called.

Examples of regular machines include titles like Couch Potato, Fishin’ Frenzy, Jungle 7s, Pick’n’ Mix, and Rainbow Riches.

When people talk about pokies, as they say in Australia, they’re referring to games that have extra layers of multimedia including things like animations, special sounds, and thematic graphics. They’re a sort of mix between conventional and arcade games.

Megaways Casino Slots Online

Megaways games use a system called the Megaways random reel modifier engine. It was invented by the Australian software provider Big Time Gaming (BTG). This modifier governs how many symbols appear on reels each time they’re spun. It unlocks as many as 117,649 different ways to win.

Megaways slots have become amazingly popular and IGT allow other software providers to use their technology under license. Some of the top rated online slots include:

  • 88 Fortunes Megaways
  • Buffalo Rising Megaways
  • Fruit Shop Megaways
  • Gorilla Gold Megaways
  • Vikings Unleashed Megaways

They are not always new games. Often, they are revamped version of older game given the Megaways treatment.

3-reel Machines

The term “3-reel slots,” speaks for itself. These are more like regular games and are still enormously popular today, and you can win some very nice jackpots if you maximise the coin counts and paylines.

If you play slots online that have 3 reels, 5 of the top choice games to look out for, include:

  • Alchemist’s Lab
  • Bar Bar Blacksheep
  • Mega Joker
  • Triple Diamond
  • Wheel of Wealth

These games have a real retro feel offering you a blast from the past to feed your need for nostalgia.

5-reel Machines

Again, the term “5-reel” speaks for itself, and these games are the most popular by far with the internet gambling fraternity. With bonuses, free rounds and other features, 6 of the best winning online slots include:

  • Age of Gods – Epic Troy
  • Dynamite Riches
  • Immortal Romance
  • Mega Moolah
  • Rich Wilde and the Book of Dead
  • Starburst

If you like to play slots machines online that give you an enjoyable, entertaining, fast paces experience, 5-reel machines are for you.

Online Slots Software Providers

An game is only as good as its software designer. It’s difficult to be specific about which are the top ten slots because every player has different tastes. But our take on this includes those shown below.

  • The Book of Dead – Play’n GO
  • Sweet Bonanza – Pragmatic Play
  • My Guess Golden Touch – Thunderkick
  • Minotaurus – Endorphina
  • Valley of the Gods – Yggdrasil
  • Mega Moolah – Microgaming
  • Gonzo’s Quest- NetEnt
  • Starburst – NetEnt
  • White Rabbit Megaways – Big Time Gaming
  • Sakura Fortune – Quickspin

All the big-name game developers are there, and they first thing that players do when landing on the best online slot sites is to search them out.

The Way We Rate Online Casino Slots

Wagering Advisors team takes many things into account when we rate UK online slots. First, we check that a platform is licensed by the Gaming Commission or one of the other top licensing agencies. We also check that the website is adequately encrypted. The minimum is 128-Bit SSL encryption.

We also verify that casinos offer a wide range of safe payment options and that they operate reliable, responsive customer support. Other things we check include:

The Online Gambling Slots Player Experience

Player experience is everything and it is determined by the range of top games available, how easy the site is to navigate, and how quickly they make their payouts.

Free Spins and Bonus Offers

The best online casino slots usually include great free spins both in the bonuses they offer and in the gameplay of the slots. They significantly increase a player’s chances of landing winning paylines.

Many types of bonuses offer free spins as an additional incentive, not just welcome bonuses but reload bonuses and special weekly offers too.

The Best UK Online Slots Jackpots

The most popular online slots are those that offer lucrative jackpots. He most sought after are progressive jackpots which enable players to not just win big time, but win life-changing amounts of money.

The Significance of RTP

RTP tell you how much money you can expect to win back when playing top UK slots, so it’s an important indicator when looking for the best payout games. But you should realise that the RTP is measured over hundreds of thousands of plays, so if you only play a game for a short while, the quoted RTP is not so accurate.

Best Slots to Play Online on Your Mobile

Mobile gambling is more popular than ever. The freedom to gamble as and when the mood takes you, wherever you might be, is appealing to many. With most games now available in HTML5, it means you can play almost any game on any mobile device, whether Android or iOS powered, at the majority of top slots sites in the UK.

No need for special downloads or apps. HTML5 technology allows your mobile device’s browser instant access. But casinos with the best online slots offers still provide free apps as some players prefer to play that way.

Best UK Online Slots Bonuses

Some UK players choose the best online casino for slots going by the bonuses the site offers. Bonuses mean cheaper gambling costs, increasing a player’s chances of winning with smaller bankrolls.

If you enjoy playing for fun, a lucrative bonus always goes down well. As well as getting the opportunity to get bonus spins, matched bonuses, where the platform matches the amount a player deposits by as much as 100%, are in effect free money.

Best UK Online Slots Welcome Bonuses

Most casinos offer welcome bonuses. They are way of attracting players to their websites rather than their competitors’ and usually offer gamblers good deals. However, they can only be claimed by new players and consequently are often referred to as first deposit bonuses.

Free Spins Bonuses for Online Casino Slots

Whether you’re a newbie or an experienced gambler, free spins bonuses on registration are one of the most popular types of bonuses.

If you’re lucky, you might encounter a free spins, no wagering bonus. They are, however, quite rare.

Online Slots Gaming No Deposit Bonus Deals

No deposit bonuses are highly sought after, and you’ll find the best UK deals listed on this website. A no deposit bonus is not how to win big prize money but is an excellent way of trying new games and platforms at no cost.

Low Wagering Slot Machines

Nearly all bonuses come with wagering requirements. Even the best site for online slots will impose them. They’re a way of reducing the chances of players winning prize money for small value bets and not returning to the site to play again.

Wagering requirements indicate how many times you must play through the bonus amount of the offer before you can withdraw any winnings.

A wagering requirement looks like this – X20 – which in this example means you must play through the bonus amount (let’s say it’s a cashback or bonus spins worth £10) by depositing and playing through £10 X20, which equals £200.

We recommend choosing an online casino with low wagering requirements under x35 if you want to cash out your bonuses quickly.

How to Play Online Slots Games

Playing online games isn’t rocket science:

  1. Use our game ratings: You’ll find our Top 10 Slot Sites a great help. They are an indication of how well liked and popular the casinos are.
  2. Read reviews from experts: To find the best slots to play online begin by visiting our website and choosing a game that appeals to your sense of fun and offers a good RTP. Also, check out is the game’s volatility.
  3. Create personal account: Visit your chosen casino, create a new player account, make a deposit if required, and claim your welcome bonus.
  4. Play Your Pick of the Best UK Online Slots and Good Luck: Having chosen a game and created your player account, you can start playing and enjoy the experience which will be made even better when you win.

Play Slots with Real Money

The best place to gamble online is any of the UK’s leading casino platforms that enable you to play slots with the real money on your computer, laptop, or mobile device. But playing for entertainment and fun only goes so far. To maximise any gambling experience, you need the thrill that only comes when you wager real money.

It doesn’t have to be expensive. Choose your casino wisely, from the many you’ll find listed on our website, opting for sites offering lucrative bonuses, and you’ll maximise your bankroll. There is also the advantage that all casinos we list are 100% safe and legal.

Why Play Free Online Slots Machines?

Playing games for free can be fun. The problem is that you can’t win any real money when playing a machine in free mode. If you do land a winning line, you’ll be left wondering might have been if you’d made a real cash wager.

Playing slots online for free is something that newbies do to gauge whether or gambling is for them, or that experienced players do to try out a new game or platform before spending real cash.

Playing Real Money versus Free Online Casino Slots

You can play the best UK online slots for free at most UK online casinos. It’s an excellent way of learning in the ins and outs of gambling, working out new game strategies, and trying them out in practice. Most machines can be played in free, demo mode.

But gambling isn’t gambling unless you wager real money, and when you do, you will quickly experience the buzz that comes with winning.

However, we stress the importance of gambling responsibly. Set an affordable limit and never go beyond it.

Top 10 Online Slots Preferred By UK Players Nowadays

Age Of Gods

Made by the famous Playtech software provider, Age Of Golds is based on Greek mythology with 5 reels, 20 pay lines and a huge amount of bonus games that you trigger randomly. As you will have a complex narrative story as an introduction, you will enjoy the rick story, brilliant graphics and a lot of colossal wins.

Mega Moolah

One of the best online slots sites and probably the most famous 25-pay line progressive jackpot comes from Microgaming that is a well-known company with a lot of high-quality titles where you will collect monkeys, zebras, elephants and giraffes. If you get three scatter symbols, you will trigger the bonus spins and if you get three lions, you will get 1500 coins! It serves as a multiplier!


Designed by NetEnt, Starburst takes you on the jewel journey while you chase 5-reels and 10 pay lines with the potential of 50,000 coins as a reward! You will collect jewels in many colors until you match 7 bar symbols that payout a lot of money! The game has realistic, yet calming sounds. If you like 3D slots, you will like StarBurst!

Book Of Dead

Revive the dead ones from ancient Egypt and earn 250,000 coins in this 5-reeler with 10 pay lines! The whole setting is inspired by the famous Indiana Jones character, with the authentic Egyptian music and theme that includes pillars, books, Anubis, Osiris and other symbols as well. The high level of mobile responsiveness made it one of the most played UK online slots on mobile devices!

Book Of Ra

With an RTP ratio of 95%, you will have a lot of chances to win money in this fantastic adventure that is based on the Ancient Egypt theme where you have 10 pay lines! Every time you get 3 Book of Ra symbols, you will trigger 10 free games! Once you trigger the bonus spins, each symbol expands. Therefore, you cover all 3 positions and increase your payout!

Crazy Monkey

Crazy Monkey comes from the Igrosoft company that has been setting the new standards in the online gambling mode as there is a chance to win 5,000 coins! What you do in this game is that you collect bananas, pineapples, lions, butterflies, trees and the rest of the company from the jungle, while the symbol of Crazy Monkey gives the best payout! Bright colors and smooth animations will keep you entertained for hours!

Thunderstruck II

The classic 5-reel title with Nordic mythology that allows you to win up to 2.4 millions of coins while you chase Odin’s Ravens and Thor’s bonuses! The game offers a lot of free rounds and multipliers that give you 5 x bigger award and to trigger the bonuses games, called Hall OF Spins, you have to get three Thor’s hammers. This has to be in top 10 slots online!

Gonzo’s Quest

Another classic title that uses the conquistador theme where you discover Inca’s temples and fountains, while the South American-like sounds give you the realistic jungle atmosphere! Free Fall golden symbols will give you respins, while you can get 15 bonus spins if you get these. The coins will fall while Gonzo will collect them with the helmet!

Vikings Go Vild

These online slots come with 25 pay lines where you can collect your Viking colleagues to increase the overall payout and get yourself free chances, sticky wilds or treasure bonus. You will collect copper, silver, gold and coins that give you profit, but also gray-haired man, blonde girl, the bald man and brown-haired man.

Mega Fortune

Mega Fortune online slots offer you 25 bet lines, 5 reels and a lot of opportunities to win money and enjoy the Hollywood-style, set in the 1970s with the funky music! Three or more Wheels of Fortune trigger the bonus game with the golden reel that consists of outer, inner and center spin, which is the progressive jackpot.

Available Banking Options

Some of the most used methods are web wallets as these offer the highest level of protection when it comes to identity and personal information. Some players prefer Visa/MasterCard though this is not one of the safest methods. Besides these, there are bank transfers as well. However, the most popular methods are:

  • PayPal
  • Skrill
  • Neteller
  • EcoPayz
  • uKash
  • PaySafeCard.

As we said, these do not disclose any personal information about the owners of the accounts, as the casino operator/bank sees only the email that is associated with the account. Therefore, the chances for hacking or any fraudulent actions are 0.1%, making it almost impossible to steal the data.

FAQ On UK Online Slots

Are online slots legit?

You do need to take care playing online slots because there are some scam sites around. However, if you choose platforms and games from those listed here on our website you can rest assured that they are 100% legitimate.

What are the best online slots to play?

There’s no simple answer to this question because the best choice of slots is a case of personal preference. However, you can maximise your chances of winning by choosing games with high RTPs and low volatility but at the end it’s down to personal choice.

Are online slots rigged?

In the vast majority of cases, online slots are not rigged. But, for absolute certainty play at one of the online casinos listed on our website. All games on these site and checked by our experts to ensure they are not biased in any way.

Are there any slots I can play for free?

Yes, nearly all online games have a free variant that you can play in demonstration mode. These three variants play in exactly the same way as the real cash slot machine, the only difference being that you cannot win cash prizes when playing in free mode.

What does volatility mean?

Volatility is a term that is used to indicate how often or how rarely a machine pays out and what the sizes of the jackpots are. Volatility comes in three levels - low, medium, and high with low being regular payouts of low value, and hi being infrequent payouts of very high value.

What is the best way to win with online slots?

Random number generators ensure that all outcomes are genuinely random. However, the best way of how to win online slots is by choosing games with a high RTP percentage and low volatility.

Can you get bonuses?

Yes, there are a lot of bonuses that you can catch playing best online slots! Almost every operator will give you free chances that you can use to test the games and see if you like them. Additionally, you will receive 100% matchups on your deposits as the way of a bonus, you will get the special promotions and limited-time offers that are lasting for a short period of time. In any case, the more you deposit, the bigger bonus you get. So, make sure to browse all the bonus offers to find online gambling slots that suits you best.

Are online slots gambling regulated in the UK?

Yes, every online gambling activity is controlled and regulated in the UK by the UK Gambling Commission that ensures that no player is the victim of illicit and unfair gambling. Since Gambling Act 2005 was passed, this entity has been testing and controlling all the operators to make sure there are no irregularities in the gambling activity. Once it spots the problem, they mark the casino. Once marked, it received “blacklisted” status, which means that is not a place to enjoy gambling. Always look for the seal of approval to make sure that you participate in the fair games where you have equal chances for winning.

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