Our Guide to the Best Slot sites UK for 2020

Looking for the best slot sites in the UK? Then look no further, we will be covering all the best websites to play slots at in 2020.

Best UK Slot Sites for 2020


£500 Bonus + 50 Free Spins

18+. New players only. One bonus offer per player. Minimum deposit of £20, Max bonus bet £5 Bonus offer must be used within 30 days and bonus spins within 10 days, otherwise any unused shall be removed. Bonus spins are valid on the following games only: Hotline and Fruit Spin, Jungle Spirit, Planet of the Apes. Bonus funds are 100% of your first deposit up to £100, 50% of your second deposit up to £250, 50% of your third deposit up to £150 Bonus funds are separate to Cash funds, and are subject to 35 x wagering the total of bonus, cash & bonus spins. Terms Apply. BeGambleAware.org.


100% Bonus up to £100 on your First Deposit

First 3 Deposits Only, Min Deposit £10, Max Total Bonus 250 Spins on Gonzo's Quest, Starburst, Asgardian Stones, Spin Value Varies, 1x Wagering, 10x Conversion, Full T&C's Apply


Get Up to £500 in Bonus and 200 Bonus Spins

18+. New players only. One offer per player. Min Dep £10. Max bonus bet £5. 1st Dep offer is 100% up to £250 + 100 Bonus spins on Aloha Cluster Pays. Spins expire after 10 days, funds after 30 days. Bonus funds separate to Cash. Wager Req of 35x Deposit + Bonus apply.


Up to £850 welcome Bonus

New customers only. First deposit only. Min Deposit £50. 10% Cashback on losses up to £200 for 24 hours from the first deposit.


Up to £500

New customers only. First deposits only. Min deposit £10. Max 50 Bonus Spins on Selected Slots only. 2x Conversion. 20x Wagering. 20% Cashback on losses up to £200. for 48 hours from first deposit. T&Cs apply. Please play responsible www.begambleaware.org | 18+


Get £150 Bonus

First 3 deposits only. Min dep £10 1st an 2nd deposit, min £20 3rd. Max cumulative bonus £150 + 150 spins. Bonus match amount varies per deposit. Spins awarded on one of four chosen games. 30 x wagering on deposit + bonus. 50 x on bonus spins. 10 Max bonus conversion. £5 max bonus stake. Full T&C's apply.


£100 Deposit Bonus

Deposit min. £10. Applies to first deposit to Casino only. Max. bonus £100. 15x wagering (game weighting and max. bet rules apply) on deposit and bonus to make the bonus balance withdrawable. Time limits and T&Cs apply.


£200 Cashback

New customers only. First deposits only. Min deposit £10. Max 50 Bonus Spins on Selected Slots only. 2x Conversion. 20x Wagering. 20% Cashback on losses up to £200. for 48 hours from first deposit. T&Cs apply. Please play responsible www.begambleaware.org | 18+


Up to £300

New Players Only, First 3 Deposits Only, Min Deposit £10, Max Bonus £300, £5 Max Bonus Stake, T&C's Apply



New Customers Only, First 3 deposits only, Min Dep £10, Max Bonus £500 + 45 spins on Wolf Gold, Selected Slots Only, 4x Conversion, 40x Wagering (Bonus + Spins), T&Cs apply.

What are Slot Sites?

Slot sites are a casino that dedicates more of its resources towards sourcing and displaying online slots for their new players to play at. While a casino site should never dedicate its resources to focussing solely on slots, they are certainly one of the main attractions when it comes to playing at a casino. All the slot sites listed on Mobile Casino Kings will be licensed and regulated by the UKGC.

How we review the best in Slot Sites

While analysing any slot site that you see listed we apply our very own review criteria to the site to ensure that each of the online casinos get a fair trial before listing them in our table above.

Website Usability – There’s nothing worse in our opinion when it comes to signing up to a casino online and the site is badly designed rendering it unusable. We like to test out both the mobile and desktop version of each site to ensure smooth playability across all devices.

Casino Games – While online slots are certainly the theme of this page we like to look at the greater selection of selected games available. Slots sure are fun but sometimes everyone gets a little bored and wants to try out something different like Roulette or Blackjack.

Welcome Bonus – Welcome bonuses are one of the main ways of attracting customers to sign up to their slot site, whether its by using a no deposit bonus, free spins or a deposit bonus this is one of the most important tools in the online casinos tool box. We pay particular attention to this part of the review as we like to see the types of Terms and Conditions such as the minimum deposit required or whether you can only use the bonus on selected games.

Slots Selection – Now we get to everyone’s favourite part, the types of online slot games you’ll be able to play. Any slot site worth its salt will have a range of different online slots categories for you to dig into whether its a progressive jackpot slot or a 3D video slot players should always be able to play their favourite games.

Payment Methods – Nowadays its vital that a slot site allows their customers to get money in and out of their accounts as quickly as possible and allow a multitude of payment methods. The more and faster methods the betting in our opinion. So much so we’ve even got a fast paying casinos page that you can check out.  

Customer Service – Everyone gets stuck as some point when playing at online slot websites. Every casino that we will have listed here will have their very own dedicated support team that you’ll be able to contact via multiple methods. We expect slots sites to be able to answer your questions quickly and efficiently.

Safety & Security – Staying safe online is more important now than its ever been. With data breaches happening all the time its paramount that you choose a reliable slot site. This means all of the data passed between your computer and the online casinos’ servers should be encrypted. You should also be playing at UKGC licensed slots sites only as this will ensure that the casino will adhere to regulations set out by the UK Government.

Types of Bonuses available at Slot Sites

There are generally three types of bonuses that you’ll be able to claim as new players when signing up to a slot site. These are:

Free Bonus No Deposit: This type of welcome bonus offer is one of the best online when it comes to allowing new players to trial out the casino games on offer. Here you’ll get bonus funds added to your account as soon as you register with your chosen casino. These types of bonus offers can take the form of extra spins.

Deposit Bonus Offer: This is where new players are required to make a deposit in their casino account before the bonus funds are released. Now this can vary depending on where you sign up as some casinos offer a 100% bonus where as others offers a 200% one. Sometimes you’ll find this welcome bonus paired up with extra spins which can only be used on selected games.

Free Spins: Free spins operate in a similar way to their no deposit bonus counterparts and are generally only cashable on a specific slot. Sites that offer these types of bonuses can even wager free spins – this type of welcome offer can be cashed out instantly. Free spins are some of the best deals an online casino will offer.

What slots sites have a low wagering requirements for their bonuses?

Slots welcome bonuses are a great way to really get the most out of your online slots experience, here we will be covering some of the sites where you get to utilise your welcome bonus as efficiently as possible without having to sacrifice the fun that you could be having playing your favourite progressive jackpots in order to hit a certain wagering requirement. Remember that all bonuses will have some form of wagering requirements attached to it whether its 1 x playthrough or 10 x playthrough. Check out the casinos below and play your favourite slots today.

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As we’ve mentioned above bonus offers are one of the main ways a casino pulls in new players through their doors with some casinos having extremely difficult wagering requirements to hit. We feel that any bonus that has a wagering requirement of 45x and above should be avoided. If the wagering requirement falls between 30 – 45 then this is completely doable should you be provided with enough allotted time.

How Does RTP Work at slots sites?

RTP stands for Return to Player, this is something that all casino players should know and understand before they even start playing any of the casino games at a site, whether its video slots or table games this is something that you should certainly be aware of. Essentially the RTP % is what the game or slot should pay out over its life time, e.g. if an online slot has an RTP of 96% then theoretically if you played through a £100 you should end up with £96 this means that specific online slot will have a house edge of 4%.

Please keep in mind though that this is theoretical calculation only and is seldom ever true. The reason why this isn’t exact science is due to all slots sites operating with a piece of software called an RNG (random number generator). These are used to create the outcomes on slots ensuring that any of the spins placed by new players can never be predicted or influenced by external factors. Below we will cover some of the slots with the highest RTP % for new players.

Highest RTP online slots

We’ve scoured all the slots currently available for UK players and have compiled a list of the highest RTP slots that are currently available. While wins may not be as big as some of the lower RTP online slot games you’ll certainly enjoy the more frequent wins.

5. Starmania – 97.87%

Starmania is a slot that’s been created by NextGen, following a similar pattern to NetEnts starburst game. This slot features wild systems which can really help aid your wins. It also features 10 paylines with a wins bot ways feature. Each line win you get you’ll also get the option to gable which means you can double or quadruple your wins (keep in mind though you can lose your wins as well). Overall this slot has an RTP payout of 97.87%

4. Blood Suckers – 98%

Blood Suckers is the brain child of Swedish slot developers NetEnt. Heavily based off Count Dracula if you’re a fan of vampire mythology then this high payout video slot could be for you. With an RTP of 98% the wins are nearly guaranteed to be coming in fast. The slot also has a great range of special features for you to trigger as well such as wild subs, free spins where you can get triple pay-outs, scatter pay symbols and these even a vampire hunting mini game where you can try your hand at being your very own Van Helsing. Once you trigger the mini game you will find yourself in a burial chamber where you will be required to open the coffins and slay the vampires that are lying in wait earning coins for each of the creatures you kill.

3. 1429 Uncharted Seas – 98.6%

Created by slot developers Thunderkick this video slot has had its reel replaced with a hand drawn map with the symbols being swapped out for a variety of sea creatures and other relevant sailing symbols. Uncharted Seas has a payout rate of around 98.6% however we did find it quick lacking on the bonus features side of things. Having expanding wild symbols and a free spins bonus round where you can get up to 50 free spins. While the lack of bonus features is a little disappointing it more than makes up for It with its high payout rates.

2. Jackpot 6000 – 98%

If you’re a fan of classic slots then this is certainly one worth checking out. This game certainly has an old school vibe to it which if you’re a fan of a more classic/basic slot then this could be for you. There are up to 5 pay lines to choose from with between 1 – 10 coins being allowed per spin. We recommend if you’re going to play this game to play with the max bet as this will allow you to trigger the Supermeter mode which has a mystery prize of between 10 – 6000 coins up for grabs. If you manage to land 3 jokers on a pay line then you will get the full 6000 coins guaranteed. So keep in mind that when you play online with this slot with between 1 – 8 coins you’ll only get an RTP of 74.9% – 79.2% where as if you play with 9/10 coins you’ll get an RTP of up to 98.9%.

1. Mega Joker – up to 99%

If you thought the classic slot Jackpot 6000 by NetEnt had a high RTP, well they went and topped that with their another classic themed slot MegaJoker which can feature up to 99% RTP. Like Jackpot 6000 your RTP % will scale based on how much you wager. If you bet with a maximum of 10 coins you’ll get between 89.1% and 99% RTP. This video slot also features the Supermeter mode as well which is a great way to boost your winnings from this fast paced online slot.

Top Slot Software developers

With new slot games coming out all the time its important to know which slot software developers you should be looking out for. Everyone has their own preferences in this department however there are some key players in the industry which you should always check out. Below are the 4 main players in the online slot software industry:

Playtech – Playtech have been in the industry since 1999 and have over 330 slots in their library. Due to their market dominance Playtech have managed to secure the IP’s for various well known titles such as Batman, Pink Panther, The Mummy, Gladiator, Superman and Monty Pythons Life Of Brian. The popularity of these films has certainly helped put Playtech at the forefront of the online slots industry.

Microgaming – Microgaming have been around since 1996 and lead the pack in terms of size and popularity. Boasting over 650 video slot titles in their library they’ve dipped their creative fingers in all the pies. They’re also featured in the Guinness Book of Records with the largest Jackpot Payout ever on an online slot, which currently stands at £13,213,838.68.

NetEnt – While NetEnt have also been around a long time it wasn’t until the last 10 years they started becoming exceptionally popular. This was namely due to them incorporating HD graphics into all their games and becoming one of the first slot software developers to truly go mobile. This has allowed them to carve out a large portion of the market. You’ll also notice that NetEnt slots tend to have a higher RTP than most of the other software providers.

IGT – IGT are the oldest on our list of software developers starting up initially in 1974 they’ve got a wealth of experience from crafting the best online slots and games for their land based casino counterparts. While their main focus over the years has been physical slot machines they effortlessly moved into the online slot market a few years ago with popular games such as Cleopatra, Pixies of the Forest and Da Vinci Diamonds to name a few.

What can I expect at a Slots Site?

With the best online slots sites listed here we would expect you to find a greater focus on you guessed it the best online slots. This means you’ll be able to play a range of games from classic, video, HD/3D to progressive jackpot games. We’d also expect new slots to be added weekly from a variety of providers to keep their libraries looking fresh and up to date with all the latest games available for new players to play.

Playing slots online Vs a casino

While playing a land based casino is fun and there’s not much that can be done in regards to recreating the thrill at home as unfortunately their isn’t a live casino section that caters for this just yet. Playing slots online does have its benefits which we will go into below:

Better Choice – With the best online casinos constantly competing with each other one of the ways for then to stand out amongst other slots sites is by having be best slot library, packed full to the rafters with new games from a host of different developers. This is great for slot players as it reduces as it means you wont be getting bored of the games at your chosen sites anytime soon. You also wont have to wait in queues to play your selected games which is something that can certainly happen at a land based casino.

Welcome Bonuses – Now this is certainly something you wont get at your local casino. Online slots sites have a myriad of bonus offers available for you to claim whether it’s a no-deposit bonus or free spins there’s normally a bonus for everyone. These are without a doubt a great way of extending your play time and also increasing your max stake which could mean much greater winnings. New players are always attracted to these types offers that’s for sure.

Enhanced RTP – Playing a slot will generally have a much better RTP than it would if new players were to play it in person. This means you’ll have more winning spins playing online than you would at a casino.

Mobile Gaming – Mobile casinos are certainly becoming everyone’s chosen way to play their favourite online slots, no longer do you have to be tied to a computer while you play your favourite progressive jackpot. So whether its playing on the way to work or on the toilet its certainly much easier than having to head down to the local casino that’s for sure.

Max bet, bonus funds and bonus spins: what are they?

Max bet: simply means you can optimise your play with multiple pay lines. The more serious new players will realise that playing the max number of pay lines on any slot is the greatest chance they’ll have of winning. If there are 30 pay lines and you only play one, then you are having 29 fewer chances to win on every spin versus someone who plays all 30 pay lines. The more pay lines you have in play, the better your chances of finding a winning line. This is why the Max bet option is always worth considering.

Bonus funds: are a means of allowing you to play a slot on the casino’s funds, with a chance to win real money. The amount of bonus funds depends on the welcome bonus, may require a suitable minimum deposit and terms and conditions apply.

Bonus spins: is another word for free spins. Bonus spins/free spins can be found in the ‘Types of Bonuses available at Slot Sites’ above.

Can I play slots with a mobile device?

Yes. The truth is a site won’t make it onto our list of the top UK slots sites if it doesn’t have a strong mobile gambling offering. The best mobile slots sites adapt the screen to fit any mobile device, and the mobile casino should also allow you, the new player, to touch it. There aren’t as many slots on mobile sites, though the choice is still big.

Should I be playing at new slot sites?

There are certainly a few perks when it comes to playing at new slot sites, certainly one of them is they do tend to be much more generous with welcome offers. However we have found them to be lacking in regards to the how many different slots are available at the site itself. Whether you choose to play at new or old is down to you as each has their own merits.

Types of slots available online

Progressive Jackpots

Jackpot slots are casino games that have a bonus which stretches over multiple casinos and a small percentage of each wager goes towards the progressive jackpot amount. These slots entice new players due to their high volatility, which means they pay out larger amounts but less frequently. Jackpot slots are usually more basic in terms of features and their aesthetics, but they are improving as of recently.


These games are the most common that you’re likely to find at top slot sites. These games have more regular payouts but aren’t nearly as much jackpot slot games. Video slots are associated with having many ways to win, often between 10 and 25, although some are known for having over 3000 different paylines. If it’s bonus features that you’re looking for, these can be found across hundreds of games, giving you the chance to play through incredible mini-games, win free spins bonuses. Video slots come in all shapes and sizes, you can find all sorts of themes, from underwater aquatic game styles, all the way to horror films and everything in between.


When picturing a slot machine that you’d find in a brick and mortar casino, we think of that classic one-armed bandit and this is what plenty of classic slots are based on. By rule of thumb, you’ll find less paylines and a much simpler style of gameplay. So, if you’re tired of bonus rounds and over the top animations, these might be more up your street.


These types of slots are constantly pushing technology boundaries, providing scintillating bonus rounds and splendid animations which adds a level of immersion you won’t find on other games. 3D slots like Betsoft’s “It Came From Venus” and Netent’s “Gonzo’s Quest” are well worth checking out.

Fruit Machines

Back when physical slot machines were first introduced in casinos, they were typically themed around fruits, hence the name “Fruit Machine”. Although they aren’t nearly as popular as online slots, game developers still include fruit symbols. If you’re feeling nostalgic, games like Cash Stax and Call of Fruity will certainly deliver.

How safe is playing online slots?

If you’re new to the exciting world of playing online slots at casino sites well then you may be slightly worried as to whether or not its exactly safe. Well let us assure you by saying if you play at any of the sites we’ve got listed on our slot site page then you will not have any problems in regards to safety.

UKGC Regulation Sites

The UK is one of the most regulated countries when it comes to online gambling and is therefore one of the hardest countries to get licensed in the world. This means that every casino you see with a UKGC license has been put through their paces by the UKGC to ensure they offer a safe and secure slot site for you to wager at.

For UK players its not just the UKGC you can look for in regards to security, there are a number of other jurisdictions that can be relied upon for old and new players. Some of the other recommended jurisdictions are the Malta Gaming Authority, Guernsey Casino Gambling Control and Alderney Gambling Control. If you see these on any of the sites you play slots at then you wont have a problem.

Slot Sites FAQ

Are slots fair?

All the sites on our list are fair places to enjoy your favourite online gambling games. All the slots listed here are fair and have been checked and audited by the UK Gambling Commission to ensure the correct regulations. Always remember to gamble responsibly (begambleaware.org).

What is the most popular slot game in the UK?

The United Kingdom has some incredible slot games to offer and there are a few fan favourites. Netent’s Starburst has been a fan favourite since it was released in 2012. Another developer to look out for is Microgaming. Their progressive jackpot network has been making a lot of noise and recently hit over a total €1Billion paid out in jackpots.

Is playing slots a good way to make money?

You can absolutely make money from playing slots. Most games have a return to player rate of 90% or above. This means in theory that for every £100 you spend; you get £90 or more back. This isn’t always the case and in some examples you might win a lot more, but on the other side of the coin, be left with much less.

Can I play online slots from my mobile?

Most slot sites offer a mobile option and this has helped online slots become accessible to a much wider audience as technology has moved forwards. All casinos, at Mobile Casino Kings offer a mobile platform where you can enjoy your favourite slots on your phone.

Which site is the best to play slots on in the UK?

There’s no simple answer to this question and can depend on what sort of experience the player is looking for themselves. We recommend you try out a couple of different sites to get a feel for what you like and you an find some player favourite casinos by scrolling up the page and looking at what we offer.

Are slots legal in the UK?

Slots are completely legal in the UK as long as you’re over the age of 18. The United Kingdom has quite relaxed laws when it comes to online gambling.

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