The Best Slot Sites for 2021 – UK’s Top Online Slots Casinos

Slots are the most popular and diverse gambling games on the internet, and are available at all online casinos. Here are the top 10 best slot sites in the UK:

The Top 10 Slot Sites with UK Licence

Slot Website Rating UK Licence Number of Slots Best Slot
Griffon 5.00/5.00 39483 809 Starburst
Ladbrokes 4.95/5.00 54743 210 Fishin’ Frenzy
Monopoly Casino 4.95/5.00 38905 403 Monopoly Paradise Mansion
LeoVegas 4.90/5.00 39198 530 Mega Moolah
Karamba 4.85/5.00 39483 598 Gonzo’s Quest
Betway 4.80/5.00 39372 300 Bonanza
BetVictor 4.80/5.00 39576 400+ Wolf Gold
SkyVegas 4.75/5.00 38718 426 Aloha Cluster Pays
NetBet 4.70/5.00 39170 560+ Da Vinci Diamonds
Grosvenor 4.70/5.00 38750 535 Book of Ra Deluxe

UK’s Top Slot Sites List

  1. Griffon Casino (Top First Deposit Slot Bonus in the UK)
  2. Ladbrokes Casino (Great Gambling Product Diversity)
  3. Monopoly Casino (Top-Rated Slot Site for Variety of Games)
  4. LeoVegas Casino (Best for Games by Many Software Providers)
  5. Karamba Casino (Top Slots Site to Play with Free Spins)
  6. Betway Casino (Good Selection of 1000+ Slot Titles)
  7. BetVictor Casino (Great Mobile Site for New UK Players)
  8. SkyVegas Casino (Trusted Operator with Great RTP Rates)
  9. NetBet Casino (Curated Slot Game Selection and Max Bet)
  10. Grosvenor Casino (Recommended Slot Website for Fast Transactions)
Greetings to Seychelles! Check Out the Best Slot Sites for June
All Sites Licensed by UK Gambling Commission

The Best Slot Websites & Offers Ranked

Slot Sites Welcome Bonus All Slots Mobile Slots Jackpot Slots Rating: Secure Link:
$300 Welcome Bonus 6000+ 6000+ 300+
5.00 ★ out of 5
www.22bet.com
$1000 + 200 Free Spins 1300+ 500+ 21
4.95 ★ out of 5
www.casinocruise.com
€400 Extra Welcome Bonus 1250+ 1200+ 73
4.90 ★ out of 5
www.leovegas.com
$200 on 1st deposit 510+ 730+ 139
4.90 ★ out of 5
888casino.com
2500 + 50 Bonus Spins 327 327 26
4.85 ★ out of 5
www.dreamvegas.com
€1600 Welcome Bonus 300+ 300+ 15+
4.85 ★ out of 5
www.jackpotcitycasino.com
€1000 + 10 Free Spins 1300+ 1200+ 21
4.80 ★ out of 5
royalpanda.com
€/$1,000 Welcome Bonus 450+ 450+ 28+
4.80 ★ out of 5
www.betway.com
€100 + 101 Free Spins 1941 1940+ 147
4.75 ★ out of 5
in.betsson.com
€25 1800+ 1900+ 10
4.75 ★ out of 5
www.comeon.com

The Best Online Slots for UK Players

Online Slot Play At RTP Jackpot Max Bet Slot Rating Safe Play Link
99.32% No £150
4.95 ★ out of 5
mansion.com
99.07% No £5000
4.90 ★ out of 5
spinstation.com
99.00% Yes 10 Coins
4.85 ★ out of 5
leovegas.com
98.90% Yes £2
4.80 ★ out of 5
casino.com
98.00% No £50
4.75 ★ out of 5
betway.com
97.87% No £500
4.70 ★ out of 5
playojo.com
97.80% No £25
4.65 ★ out of 5
netbet.com
97.60% No £100
4.60 ★ out of 5
casimba.com
97.43% No £75
4.55 ★ out of 5
slotsmillion.com
97.32% No £3
4.50 ★ out of 5
ladbrokes.com

Please note that all of the above-presented online slot sites are licensed and regulated by the UK Gambling Commission, which is a sure sign that their online gambling sites are safe to play at. Other than that, we’ve prepared the ranking based on the following features of the websites: number of slot games, number of mobile-friendly slots, number of progressive jackpot slots and welcome bonuses. For the latter, we’ve also created a special slots bonuses page and a guide for the deposit bonus slots UK players can grab.

The Best Slot Site to Play from the United Kingdom

🥇 Best Slot Site The Grand Ivy
🔝 Top New Slot Site Virgin Games
🤑 Jackpot Slots Website Casimba
💸 Highest Payout Slots Site Spin Rider
🎁 Best Slots Bonus Site Karamba
⚖️ Low Wagering Slot Site mFortune
🚫 No Wagering Slots Site PlayOJO

Nowadays, the competition among online slot sites is fierce. Every operator tries to allure new customers by offering something different. Some rely on the big online slots library, others on alluring welcome bonus offers with extra spins. Either way, the bigger competition can be taken only as an advantage from the players’ perspective. Today, UK players are spoiled with choice when it comes to selecting a new slot site and can base their decision on their preferences and desires. Progressive jackpot slots, welcome bonuses with appealing wagering requirements, high payouts, tournaments, free spins, new titles – it’s up to you to decide what you’re after. You can even enjoy other forms of wagering by checking out our list of all gambling sites.

Every customer is precious, so it’s rare to see an online slot site that doesn’t offer to customers some kind of a welcome bonus or a loyalty program. More often than not, such promotions and programs are closely connected with playing slot games, but there are many live casino bonuses as well. The more you play, the more your chances to win. Most of the time, the best online slots contribute 100% towards any wagering requirements and bring you the most loyalty points. Experienced players know how to get advantage of the top slot sites UK, and make multiple registrations so that they can benefit from the strongest feature of each website. Check out our recommended online slots sites above, and jump straight to our extensive and honest assessments of those gambling sites in their respective reviews. And if you are looking for other types of games to play, you could always play at best live blackjack casino site in the UK instead.

How to Find the Best Slot Sites

These are the criteria that UK players need to follow when they are choosing a slot site at which to play online.
How to Find a Slot Site Step 1
Slot Catalogue Check
The best slot sites need to offer a diverse choice of classic slots, video slots, jackpot slots and 3D slots.
How to Find a Slot Site Step 2
Safety & License Check
UK players should only consider slot sites with a valid UKGC license and technical security audits.
How to Find a Slot Site Step 3
Slot RTP Check
The RNG of online slot games needs to be inspected by independent organisations to verify the RTP levels & fair payouts.
How to Find a Slot Site Step 4
Slot Bonus Check
The best online slot bonuses should have a high deposit match, free spins and 100% slot weight for wagering.
How to Find a Slot Site Step 5
Mobile App Check
A top UK slot site should offer full compatibility on your mobile device via the default browser or a dedicated app for Android/iOS.

Casino Websites with the Highest Slot Payouts

Slot games are without a doubt one of the most entertaining casino games, but we should not forget that players’ main aim is winning. While it is true that online slots are mostly game of luck, there is a way to increase your chance of winning. By choosing to play the highest RTP slots, you can be confident that a certain percentage of wagered money would be paid back to you. Thus, theoretically speaking, you should always select games with an RTP higher than 96%. You can also try some free casino games and choose the right ones for you. In the table below you will find our top 5 casinos with highest slot payouts, and the top 3 high RTP slots that they offer:

Slot Casino Slot Bonus Top High RTP Slots Slots Payout Secure Link
Up to £300 + 50 Bonus Spins Frozen Diamonds, Dead or Alive, Boom Brothers 98.60% www.spinrider.com Full T&Cs apply. 18+. New players only. 1 bonus offer per player. Min. deposit £20. Max. bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Winnings from Bonus spins credited as bonus funds and capped at £100. Bonus funds expire in 30 days, unused bonus funds will be removed. Bonus funds are 100% match up to £300 and 50 bonus spins on eligible Netent games on your 1st deposit, 40% match up to £1,000 and 20 bonus spins on eligible Netent games on your 2nd deposit, and 80% match up to £500 and 40 bonus spins on eligible Netent games on your 3rd deposit. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds contribute towards any wagering requirements. BeGambleAware.org.
500 Spins Each Worth 50p Starburst, Finn and the Swirly Spin, Rainbow Riches 97.71% www.bgo.com Full T&Cs apply. 18+. *UK only. Win up to 500 spins from Mega Wheel on 1st deposit. 24-hour expiry. Max bet £2.50, Max Spins win £8 per 10 spins, Max Bonus win £150, selected games & 65x wagering on winnings. Min deposit £10. No Neteller/Skrill.
£100 + 200 Spins Goblins Cave, Captain’s Treasure, Goldilocks 97.00% www.casino.com Full T&Cs apply. New customers. 20 Spins for selected AOTG slots credited on reg, 180 (20 per day) following first deposit. Spins valid for 24 hours, exp in 30 days. Winnings credited as bonus funds with 20x wagering, max win £100. Min £20 dep for bonus funds. 40x wagering, game weighting/restrictions, betting limits. Casino-only bonus. Not Available on iOS app. Payment restrictions.
£25 + 20 Bonus Spins Blood Suckers, Jack Hammer II, Dazzle Me 96.50% www.casumo.com Full T&Cs apply. *18+. New UK customers only. Opt-in required. 20 Bonus Spins on "Book of Dead" and 100% Deposit Bonus up to £25 on first deposit. Min deposit £10. 30x wagering requirement for Bonus Spins and 30x wagering requirement for Deposit Bonus (game weighting applies). Max £5/spin or £0.50/line or £50/round (live casino). 30 days expiry. T&C's Apply. Please gamble responsibly http://www.begambleaware.org/
£100 + 100 Extra Spins Reel Rush, Goldilocks, Pyramid: Quest for Immortality 95.94% www.slotsmillion.com Full T&Cs apply. 18+. New UK customers only. 200% deposit bonus up to £60: Min deposit £20 and 48x wagering requirements apply on bonus (game weighting applies). £3 max bet applies when playing with an active bonus. T’s and c’s apply. Please gamble responsibly, www.begambleaware.org.

Bear in mind, however, that all of the payouts stated above are theoretical and there are other factors that could affect the maximum payout. These include the maximum betting limit, bets per line and bets per spin. Moreover, the presence of wilds, free spins, bonus rounds, extra spins and multipliers can also impact the game’s maximum win. Thus, apart from a high RTP, you must always consider the presence of other details that could affect the number of your rewards. You should also have in mind the availability of gambling Android apps, for example – they can also be usueful when it comes to convenience.

Moreover, you should keep in mind that there are upcoming venues, like all of the best Thunderkick slots casinos, that have recently seen an increase in payouts and are expected to soon make it into the list above. Plus, you can take a look at the £10 no deposit slot bonus offers that some online slots sites launched. You will also find that many of the best no deposit casino bonus offers in the UK can be used to play slots. Except for a high payout, though, you will need your operator to support one more ‘payout’ – for this you can check our list filled with operators of fast withdrawal casino in the UK.

Best Slot Sites with Low Wagering Bonus

In order to be able to enjoy your favourite slot games fully, you must always make sure that you have enough funds. To help you save your money and enjoy as many games as possible, many top real money online casinos have low-stakes and appealing welcome bonuses. If you decide to claim a bonus, you will usually receive bonus money, and you’ll have to meet certain wagering requirements. Wondering which casinos offer the lowest wagering conditions? Read our guide about the best UK low risk casino offers. And…

For your convenience, we have listed the best slot sites UK with low wagering bonus requirements.

Low Wagering Slot Site Slot Bonus Terms & Conditions Playthrough Requirement Secure Link
Up to £100 + 100 Free Spins Full T&Cs apply. 18+. New players only. Up to 10 (20p) free spins on Super Win 7s for 10 days. Winnings paid as bonus credit. Expire 00:00 every day. Max withdrawal from free spins bonus winnings £50. Up to 200% deposit match of first deposit (Min £10). Max £100 awarded as bonus credit. 20x wagering on bonus credit. Withdrawing Unspent Qualifying Deposit will exclude the player from these promotions. 1x the Bonus Amount £3 Minimum Deposit www.mfortune.co.uk
Up to £400 on Classic Slots Full T&Cs apply. 100% buy-in up to £400 buy-in bonus. Min £20 cash buy-in to be eligible. Offer only available on classic slot games. Max bonus £400. Max stake £2. 20x wagering requirements on total of buy-in and bonus amount. Bonus is valid for 7 days. Keep it fun - set your deposit limit. 20x £20 Minimum Deposit www.grosvenorcasinos.com
120 Free Spins Full T&Cs apply. 18+. New depositors only. UK residents only. Minimum deposit £10. Free Spins are valid only on Starburst and expire in 7 days. 10x wagering apply. Certain deposit types are excluded. 10x the Free Spins Winnings £10 Minimum Deposit www.casino.partycasino.com/en
Up to £200 + £10 Extra Cash Full T&Cs apply. 18+. New Customers only. £10 minimum deposit required, 35 x wagering in order to receive the maximum of £ 200 bonus. Contributions to wagering vary by game. Bonus within thirty (30) calendar days under the 'My Bonuses’ section of your account (found under 'My Profile'). The 100% bonus up to £ 200 will be paid out in 10% increments to your Main Account balance. Max bet per spin is 50% of your deposit up to £20. 20x the Bonus Amount £10 Minimum Deposit www.videoslots.com
Up to 500 Free Spins Full T&Cs apply. 18+. *New players, £10+ deposit, no e-wallets/prepaid cards, 50x wagering on Vegas Free Spins, 40x wagering on Casino Free Spins. 40x/50x £10 Minimum Deposit www.casino.netbet.co.uk
Up to £100 + £88 Free Play Full T&Cs apply. 18+ No Deposit Offer : New players only • £88 is granted in FreePlay (FP) • FP must be claimed within 48 hrs of receiving the email and expires after 14 days • FP wins are credited as bonus and capped at £15, exc. JP win • Deposit Bonus Offer: £20 min deposit • 100% up to £100 Bonus • Bonus wins are capped at £500 • To withdraw bonus & related wins, wager 30 x (bonus amount) within 90 days • Restrictions apply to deposit until wagering requirement fulfilled • Wagering req. vary by game • This offer may not be combined with any other offer • Withdrawal restrictions: No Deposit Offer terms & Deposit Bonus Offer terms. 30x the Bonus Amount £20 Minimum Deposit www.888casino.com

As you can see, many of these low wagering sites also require a very small first deposit, which makes them perfectly suitable for all the low-stakes players. If you like small initial payments, then you should check out our guide with the top £10 deposit casino sites for UK players as well! Unfortunately, while certain casinos may offer surprisingly generous bonuses, their wagering requirements might be almost impossible to complete. Thus, you must always read the corresponding terms and conditions before making a deposit. Generally speaking, you should avoid bonus wagering requirements of 50x or more as they are the hardest to meet. Meanwhile, medium wagers of 35x to 40x are easier to complete as long as you are given enough time. Technically, however, you should always aim for online slots sites with low wagering requirements of less than 30x, as they are the easiest to meet even at some of the new Playtech casino sites.

Best Slot Sites with No Wagering Requirement

Luckily, certain online casinos allow you to enjoy your casino sign up bonus without having to meet any wagering requirements. In most cases, however, your bonus will consist of free spins and not of cash to play with. Nevertheless, you must bear in mind that the number of free spins that you receive might vary depending on how much you have deposited. You must also always check the bonus validity as some welcome bonus offers and other promotions expire after a certain amount of time.

While some operators may tie their free spins to a certain slot, others would allow you to use your extra spins on each online slot you like. £5 deposit slots sites, on the other hand let you get into the action with a minimal deposit of 5 pounds. Wondering which are the best no wagering free spins casinos? As you can see below, our top choice offers a welcome bonus of up to 50 free spins for an unlimited period of time. Click on the button below to claim your bonus, receive the free spins and enjoy your favourite slot games.

50 Spins
  • Many Slots and Jackpots
  • Unique Loyalty Rewards
  • Cash Back on All Games
Full T&Cs apply. 18+. First deposit only. 50 Free Spins on the Book of Dead slot. Min deposit £10. Excl. new players in N.I. Each Free Spin valued at 10p. OJO’s Rewards and Game Play policy applies.

Online Casinos Offering Free Slot Tournaments

Slot tournaments are without a doubt one the most exciting features that an online casino may offer. They work in a simple way. The basic structure of an online slot tournament involves accumulating points rather than cash. The tournament rules may vary depending on the game and the online casino you are playing at but generally speaking, players will be competing and trying to collect the highest number of points before the time runs out. Normally, free spins do not count for the rankings.

While some online casinos offer free entries, you might occasionally be asked to pay a certain amount to enter the tournament. However, you would be given a certain credit to play for the duration of the tournament. Ready to join an online slot tournament? In the table below we have listed the best online slots sites offering free slot tournaments and the prizes that you would be competing for.

Online Casinos Free Slot Tournaments Prize Slot Site Rating Secure Link
Unibet Daily Spins Tournament £5,000 Prize Pool 4.90/5.00 www.unibet.co.uk/casino/tournaments#10231
Breakfast Club, Lucky Break, Daily Drop, Super Sunday and bgo Big One £2,500 Тop Prize, Free Spins and Cash prizes 4.80/5.00 www.bgo.com/tournaments
Slot Races FreePlay, Free Spins, Bonuses and Cash Prizes 4.75/5.00 www.888casino.com/races/
NetBet Tournaments 100 Free Spins 4.75/5.00 casino.netbet.co.uk/tournaments

Most tournaments would often offer little prizes along the way (such as extra spins), as well as a big prize for the winner. The slot tournaments may have a set prize pool, or it might be continually growing depending on the number of players that have enrolled. As with all slot games, your ranking in the tournament would depend mostly on your luck. To increase your chance of winning, however, it is advisable to bet the maximum amount possible, spin fast and take the best advantage of the slot’s bonus rounds and free spins.

Playing at Newer Slot Sites Offers You Many Advantages

The constantly growing popularity of the slot games and the increasing player interest in them have led to the necessity of more international online casinos that satisfy the customers’ need for a wide slot variety, generous welcome bonuses and easy to fulfil wagering requirements. Thus, it comes as no surprise that in recent years we have witnessed the launch of online many slot sites and new casinos for British players that have managed to become popular and to confirm their firm position on the gambling market in a short time. Wondering why? Most new slot sites UK count with rich collections of slots from various software developers. If you want to see the latest welcome bonus offers, then take advantage from our best new slot sites ranking for 2021.

The Top 10 Best Online Slots for UK Players

The best online slots are the ones that have the highest RTP because they give you the best chances to win over a long period of time. In combination with a suitable bonus, some free spins and a dose of luck, they can bring you both excitement and good odds. Here are the top 10 best online slots:

#1 Slot Goblin's Cave - Highest RTP

1. Goblin’s Cave – 99.32% RTP

Goblin’s Cave is a treasure-themed 3-reel slot from Playtech. The game has 3 paylines and a hold feature, putting you in control. The innovative multi-spin gameplay and option to hold symbols adds an element of skill to the game, making it the highest paying online slot. Find out more in our detailed Goblin’s Cave slot review.

Ugga Bugga Top Online Slot

2. Ugga Bugga – 99.07% RTP

Ugga Bugga is a 3-reel slot with a difference. It consists of 10 individual 3-reel slots which each have a single payline. You get to decide which symbols to hold and lock in place. This skill factor is reflected in the high RTP. Check out our Ugga Bugga slot review for full details of the Playtech game.

Mega Joker Slot by Netent

3. Mega Joker – 99.00% RTP

One of NetEnt’s classic online slots. It boasts retro-style gameplay with traditional fruit machine symbols and mystery joker wins. The game features a Supermeter mode with boosted payouts. It is also maong the top progressive jackpot slots. Read this Mega Joker slot review for full details about the features of the game.

Jackpot 6000 Slot by NetEnt

4. Jackpot 6000 – 98.90% RTP

This classic 3-reel retro slot from NetEnt has the look and feel of a traditional pub fruity. The simple rules, engaging gameplay, and potential for big payouts make it a popular choice with players. Highlights include Supermeter mode, a gamble feature, and a 6000 coin jackpot. Check out the Jackpot 6000 slot review for a complete overview of the game.

Blood Suckers Top NetEnt Slot

5. Blood Suckers – 98.00% RTP

This vampire-themed video slot has 25 paylines. It features wild substitutions, free spins, and a vampire-slaying bonus game. With sinister symbols and spooky sound effects, it makes for a spine-chilling gaming experience. To discover everything the game has to offer, get your teeth stuck into our Blood Suckers slot review.

Starmania Slot by NextGen

6. Starmania – 97.87% RTP

This Nextgen video slot has the feel of an arcade game, with high quality graphics and ethereal sound effects. The 5-reel slot has 10 paylines, with wins paid both ways. Special features include free spins, stacked wilds and a gamble option. Check our complete Starmania slot review to learn more about the engaging game.

Kings of Chicago Slot by NetEnt

7. Kings of Chicago – 97.8% RTP

This NetEnt video slot provides an innovative twist on traditional gameplay. The 5 x 3 reel setup is filled with playing cards. Instead of matching symbols, you win by lining up poker hands across the paylines. The game features a joker wild and free games. Our Kings of Chicago slot review will fill you in on all the important details.

Devil's Delight Slot Logo

8. Devil’s Delight – 97.60% RTP

This red-hot slot is wickedly fun to play. It features the Soul Reaper bonus game, where you pocket prizes for matching the sinner to their sin. Help the grim reaper collect enough souls and you will trigger the Sin Spins feature, with free games, extra spins and expanding symbols. Find out all about this popular NetEnt video slot in our Devil’s Delight review.

Couch Potato Slot by Microgaming

9. Couch Potato – 97.43% RTP

It’s retro all the way with this classic 3-reel slot from Microgaming. It features incredibly simple yet engaging gameplay. The slot has a single payline and the reels are filled with traditional symbols. It also includes a multiplier wild which can boost payouts 25x. Our complete Coach Potato slot review contains all you need to know about the fun game.

Alchemist's Lab - Top Slot by Playtech

10. Alchemist’s Lab – 97.32%

This magic-themed 3-reel slot from Playtech has the potential to conjure up some big payouts. The classic slot has a unique style, capturing the mystical theme. There is a single payline and an impressive 10,000 coin maximum win. It also features a rewarding pick and win bonus game. Our Alchemist’s Lab slot review will give you a closer look at the game’s highlights.

There are so many slot games online that it’s only natural that you’d be at a loss which one to choose. And since there are a few things to take into consideration when picking slot games, a short but informative overview of a slot might save you a lot of time and money. That’s why we have prepared reviews of the games you might be interested in. In these, we provide an objective opinion on the pros and cons of each slot and give you the chance to play some extra spins in practice mode. If you need help picking a slot game that satisfies your needs, have a look at some of the most popular titles among British casino players:

RTP Alphabetic Rating Latest Reviews Newest Slots
901 The Best Online Slots Reviews

We hope you’ve found our selection of slot games reviews useful. And even though it includes many of the best online slots, it might happen just so that you can’t find the title you’re looking for. If that is the case, don’t worry. The current one is not the final version of our list of top online slots. We are constantly adding dedicated pages for games, so make sure you check back with us regularly for more slot reviews. However, if you wish to diversify your experience from time to time, don’t miss out on the best online live roulette UK sites as well, and grab the top online roulette welcome bonuses!

Online Slots Guide

We doubt that there is a person alive who doesn’t know how slot machines work. Even if you have never played one, you have certainly seen someone playing them, either in person or in the movies. Still, we could all use a little refresher, so here are the basics of how slots work. We’ll start with the different types of slots at the best online slots sites. Then, we’ll give you a list of the special symbols and their combinations. Finally, we’ll focus on the software and how to personalise your game.

The Different Types of Slot Machines

The first slot machine was invented at the end of the 19th century. Since then, there have been a lot of imitations. Originally, all slot machines had three reels – that characteristic stuck for quite some time. Nowadays, most slots you will come across at both online and land-based casinos have five reels. The greater the number of reels, the more the possible combinations – hence, more opportunities for wins, extra spins and bonus rounds.

So, keeping things simple, this is the basic categorisation when it comes to slots – 3 vs 5 reels. The classic 3-reel format is still quite popular to this day, especially for fans of retro looks, but 5-reel slots have been leading the way for some time now. Most of the new video slot games you can find at the best slot sites UK have five reels – or sometimes even more!

Even without considering the number of reels, there are literally thousands of different slot variations and themes. There are, of course, other characteristics that could put slots into different categories. For instance, a slot could have a progressive or non-progressive jackpot. Progressive jackpot slots can offer some mind-blowing prizes. Depending on the casino policies, the money could be gathered from just this one game or from multiple slots, and even online slots sites, at the same time.

Progressive jackpots often get huge, and you will see them featured on the home page of many online casinos. The Guinness World Record for the largest jackpot paid out by an online slot machine is £13,209,300 – it was won by Jon Heywood, a UK citizen, who was playing Mega Moolah at Betway Casino. The record is yet to be broken, though it has come close a few times.

There Are Many Different Slots Games

Combinations & Special Symbols

Slot machines have 3 or 5 reels with symbols all over them. This is a very unique type of game, because of these symbols and you can’t find a common system neither on the best scratchcard sites nor at casinos with blackjack and other table games. When identical symbols appear in a certain pattern, called a payline, you win coins depending on the number of identical symbols and their value according to the paytable. At land-based casinos, you spin the wheels by pulling a lever or hitting a button. At online slot sites, you click the ‘spin’ button. Once you initiate a round, all you can do is hope that three or more of the same symbols will land on a payline. Usually, the symbols need not only to appear on a payline but also to start from the leftmost reel.

As far as symbols go, these can be pretty much anything you can imagine. They fit the themes of the online slots beautifully and add to your gaming experience immensely. However, certain special symbols are featured in almost all slot machines in one form or another. You’ll love these for their special powers. Let’s take a look.

These three special symbols are the most common ones but, in fact, there are a lot more. We’re not going to go over all the possibilities here in detail because, when it comes to the variety of slot machines, the sky is the limit. We’ll do something better. Make sure you check out our slot reviews, where we give you all the important info on each game available in our list of online casinos for UK players. We believe that would be a much more helpful way for you to discover the particulars of special symbols.

Software & Settings

There are many advantages of playing slots online rather than at a brick-and-mortar casino. There is a great variety of games and welcome bonuses, no doubt, but there are also multiple ways to enhance your experience that are not available offline. Those personalisation options not only customise your game but can actually help you save time and get to those big winnings faster. Take the slots of Thunderkick as an example. You can easily adjust your stake by decreasing or increasing the ‘coin value’ and the ‘bet level’ – the wide range of options lets you play with your stake and settle on the one most comfortable for you.

Once you’ve done that, you can easily take care of any time-wasting actions. You can do that in two ways. On the one hand, there’s the awesome ‘Quick Spin’ option, which significantly reduces the time it takes for a spin to finish. Sure, it takes away from the suspense of the game, but it’s really helpful if you want to get to those extra spins and big wins quicker. On the other hand, there’s the handy ‘Auto Spin’ option, which takes away the boring clicking on the ‘spin’ button. You can choose a preset number of spins to be performed, and some of the best online slots sites even provide the option to auto spin until reaching a bonus round, which is really great. Both time-saving options come handy when you need to play through a welcome bonus, slots bonus or another promotion.

Slots are a great game to turn that welcome bonus over the required number of times because they contribute 100% to the wagering requirements. Certainly, you can also adjust the technical aspects of the game – graphic quality, sound level, etc. Those options are especially useful as slot games can be quite noisy. The variety of those options depends on the slot site and the game itself. Newer games generally look way better and have more settings to play with. Of course, you can enjoy the best gambling games even if you are not a fan of slots.

The Best Slot Machine Software Developers

The online gambling industry keeps on growing and evolving and there are plenty of companies that create cutting-edge software for it. When it comes to online slots, there are quite a few companies out there. For the purpose of this review, however, we will take a detailed look only at the most popular ones. These are the top gaming software developers and they have stood the test of time and proven their quality over and over again. Moreover, they’re undergoing constant changes to become even better in the process. In the table below, you will find listed the biggest software developers along with their most popular slot games.

Software Developer Established All Slots Most Popular Slots Software Rating
1994 250 Guns N’ Roses, Jack Hammer, Gonzo’s Quest
5.0 ★ out of 5
1999 250 Foxin’ Wins, A Dragon’s Story, Panda Mania
5.0 ★ out of 5
1999 330 Monty Python’s Spamalot, Batman & Catwoman Cash, Piggies and the Wolf
4.9 ★ out of 5
1975 150 Mega Jackpots Cleopatra, Family Guy, Apollo Rising
4.9 ★ out of 5
1994 660 Avalon II, Hot as Hades, Jurassic Park
4.8 ★ out of 5

Each of the aforementioned software developers has a rich slot collection and is constantly developing new and challenging games. Furthermore, the software developers that we have recommended are not only well-established in the industry but also safe and certified. Some of the developers also provide table games at UK live casinos in addition to their slot games. Bear in mind, however, that each slot’s betting limits may vary depending on the online casino you are playing at. Eager to find out more about the software developers? We have listed further information below, alternatively, you can read each developer’s review by clicking on its logo in the table above.

Software Houses That Develop Great Online Slots
  • When it comes to excellence in online gambling software, the name of Net Entertainment is sure to come up. Their portfolio is not the biggest one, but it has some of the best online slots we have ever played – like Gonzo’s Quest, Jack Hammer, Jack and the Beanstalk, Starburst and many more. Players who have been around the block will probably recognise a NetEnt game simply by looking at it, as the superior graphics and interesting themes are a huge tell. The games developed by NetEnt are thoroughly tested and proven to be 100% fair by several independent agencies and gambling authorities – including the UK Gambling Commission, The Malta Gambling Authority, and the Gibraltar Gambling Authority, among others. NetEnt has always been spearheading innovation in both graphics in gameplay, and we are always excited about what they do.
  • This company was responsible for the creation and launch of the first online casino ever. Microgaming has been around since 1994 and is truly a force to be reckoned with. Given the years that they have in this business, it will probably come as no surprise that they have a catalogue comprised of more than 1000 games – and most of them are slots. Their classic games include titles like Avalon II, Thunderstruck II, Terminator II, Immortal Romance, and the legendary Mega Moolah, which we already mentioned. We have to be honest – when it comes to graphics, those games can hardly compare to the quality that NetEnt provides. However, the newer slots Microgaming creates are looking great, and their overall gameplay sets new standards in the field. We are talking about titles like Game of Thrones, Jurassic Park, The Dark Knight, and others.
  • This company has been developing gambling software for more than 15 years now and is arguably the most popular one of its kind. Unlike other companies who just develop games, Playtech raises the level and supplies casino sites with entire multifunctional platforms. That is why they are the preferred developer for many of the top casino operators in the UK, such as Ladbrokes, Casino.com, William Hill, Gala and Titanbet. As far as their portfolio of online slots goes, Playtech offers a huge selection of over 500 titles, the most popular among which are based on famous movies or TV shows. The easiest way to recognise a Playtech-powered casino is by taking a look at its game library. Some of the most popular titles commonly met at the best online slots sites are Monty Python’s Spamalot, King Kong, Gladiator, Pink Panther, Rocky and the Mummy, to mention but a few.
  • You will not find games by Random Logic on many websites. That’s not because they are not good – it’s just that RandomLogic is a part of the 888 Group, which means that it creates games exclusively for 888 Casino. They are doing an excellent job because the games look and play great – both in the desktop and mobile versions of the casino. What makes Random Logic stand out is the uniqueness of their slot games, bonus and extra spins features. You will understand what we are talking about as soon as you play one of the games – Millionaire Genie, Snack Time, Ultimate Universe, and more. They are also responsible for some of the best progressive jackpot slots found at 888 – like Pirates Millions an Ultimate Grill Thrills. Even though they are not among the most famous names in the business, their portfolio is full of quality games that are definitely worth playing. Visit 888 to give them a try!

Online Slots Are Fun and Safe – Try Them Today!

Slots are a classic casino game that can be enjoyed by absolutely anyone. It does not require any special skills or deep analytical thinking. It’s a game that delivers a good time and can eventually make you win. To have the best time you can possibly have, pick one of our recommended casino sites and go try out their slot machines. Get those 200% deposit bonus offers and fat welcome bonus packages and give online slots a try. You never know – you might just fall in love. If you are a player that is really focused on their security, we have a list of the safest online casinos in the UK, which you can check out.

Oh, and there is one more page that you might be interested in – our brand new catalogue filled with amazing casino images that you can download! And if you love games of chance, why not try your luck at one of the top 10 bingo sites that we listed for our readers? Better yet, you might wan to explore the land of free slots to play for fun. If you don;t want to play only at slot sites, you can take a look at the new gambling websites that can offer you an amazing array of games. And in the end, you must choose a payment method to use for which we advise you to read about PayPal online casino sites or deposit by mobile slots.

Slots Related Most Frequently Asked Questions and Answers

We hope that you have found all the information you need and that we have managed to help you find the best slot site for you. Still have any doubts? We will gladly resolve them for you. In the section below we will answer the most frequently asked slot-related questions. For more explicit information about a certain slot-related topic, please click on the corresponding image above.

🔝 What is the best online slot casino?

Our team follows a strict list of criteria when we evaluate online gambling sites. We pay attention to the safety, the game catalogue, the mobile compatibility, the welcome bonus, the banking and many more factors. And, considering them all, we compiled a list of the best online slots sites for 2021.

🔒 Are all of the top 10 online slots sites safe and licenced?

Yes, you can be certain that all of our selected best slots sites UK are safe to play at and licenced by official authorities such as the UKGC and the MGA. Additionally, all listed slot casinos have SSL security certificates and are constantly being audited, to guarantee that your game would be fair and your private data would be safely stored.

🆓 Can I play online slots for free?

This depends mainly by the operator that you choose. Some online casinos, as well as some software developers themselves, grant you the possibility to try certain games in demo mode. You have 'play' money and while you cannot win, you can still get the ropes of the slot, while playing with free spins.

📱 Are all of the recommended top UK slot sites mobile compatible?

Generally speaking, all of our listed best slot sites are mobile-friendly. However, some of them might offer a richer mobile slot selection than others. Certain mobile casinos also offer convenient mobile bonuses. For more information about each of our top slot casinos' mobile slot catalogue, please read its corresponding mobile review.

🎁 What slot casino offers the best bonuses?

All of our recommended top slot sites offer generous welcome bonuses. However, the online casino that currently offers the highest welcome bonus is Casimba. Nevertheless, we strongly recommend you to explore all top UK slot sites, as all offers have different wagering requirements and the highest welcome bonus amount might not always be the most convenient for you.

🙋 What is the minimum deposit required to play at the top slot sites?

All slot casinos have different deposit requirements, which may also vary depending on the chosen payment method. Generally speaking, however, most online casinos would require a minimum deposit of £20, although may also accept a £10 minimum deposit. For more information, we recommend you to read each slot casino's corresponding review and terms and conditions.

🚨 What is the legal age to play at online slot sites?

Underage gambling is strictly prohibited at slot sites and online casinos. In the United Kingdom, in order to be legally allowed to gamble, all players must be at least 18 years old. However, in different countries and jurisdictions, the minimum age may vary. You can find more information in our article dedicated to the gambling ages around the world.

❓ Do the free spins bonuses apply to all slots?

All of our top slot sites offer different bonus terms and conditions. However, if the free spins are part of a welcome bonus package, they would most likely be valid for a certain slot only. Nevertheless, if the free spins are a separate promotion, they could also be valid for multiple slot games.

🤔 Are online casinos able to change slots theoretical RTP?

No, online casinos are not able to change slots theoretical RTP as all games come with an already set percentage. Nevertheless, if an operator has passed all necessary inspections, it would have each slot's RTP displayed. Progressive jackpot slots would generally have lower RTPs than the typical RNG games. You can find explicit information on our Slots RTP page.

💰 How to win at online slots?

As you know, slots are mostly a game of luck. Thus, even though there might be certain tips that you could follow to increase your chances to win, there is no certainty that you will succeed. Generally speaking, you would have a higher chance of winning if you choose slots with a higher RTP or many bonus features and extra spins. To ease your game, we have prepared a special slot strategy and tips that could increase your possibilities to win.

🎰 How do casino slots work?

A casino slot can have a different number of rows and reels with images on them. These images are called symbols and each has a different value. The paylines are the combinations of symbols on the reels and the rows that eventually you can win. The spinning happens with a button that you push, but from there, a computer determines the outcome, through a Random Number Generator.