Updated: January 3, 2022

Best Slot Sites in the UK

Welcome to the ultimate online slot sites guide for casino players in the UK. At Casinomir we pride ourselves in doing thorough research to bring you a definitive list of online casinos that offer the best promotions and payouts for slots in the UK.

With many of these promotions you can play for free without risking any of your own money but you can still win real money that you will be able to withdraw after meeting the sites wagering requirements.

This is not just marketing talk, UK players have won millions of pounds playing on the top slot sites without making any deposits at all. In our casino guide, you will find everything you need to know about playing online slots in the UK, including how to make the most of all the fantastic online slot promotions.

With so many new casinos opening online, this is the best time to play online slots and we regularly update our lists to include the most generous promotions. If you are uncertain about playing at a specific casino please read our independent reviews to find the best suitable slot websites in 2020 and contact us if you have any questions or require more information.

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How to find the Best Online Slot Sites?

Slots are, without a doubt, currently the most popular casino games in UK because they offersome of the best online payouts.

Slot machines have existed in the UK for over one hundred years and have always been an integral part of physical casinos, and their popularity has not diminished with the public’s move to online gambling.

These classic games, which pay out when the symbols line up in a row, have been taken to a whole new level by online software gaming providers like NetEntEvolution GamingMicrogamingNextGen and Quickspin. The best UK slot sites have great graphicscool music and amazing bonuses and a lot of them are able to play on your mobile.

With so many choices, it is often hard to find the best sites offering slots and that’s where Casinomir comes in. We have a comprehensive list of good slot sites with bonus for UK players and we highlight the best free and no deposit slots and promotional offers for new players.

If this is your first foray into the world of online gambling, free slots are great offers and the concept is really simple. When you register at a new casino you are given a certain number of free spins that require no deposit and allow you to play a selection of slots that are part of the specific welcome bonus or promotion. Just remember to check exactly what slots are covered by the promotion before you sign on.  

The great thing about playing free slots is that you don’t need to risk your own money to play, but if you win you are entitled to keep the money provided you meet the wagering requirements of the site. These vary depending on the online casino but often require that you wager your profits a certain number of times before you can withdraw any money.

Don’t let this put you off, UK slot players have won millions on free slots without risking any of their own money. Use the Casinomir guide to find the best slot machine sites and ensure that you don’t miss an amazing opportunity!

With so many choices, it is often hard to find the best sites offering slots and that’s where Casinomir comes in. We have a comprehensive list of good slot sites with bonus for UK players and we highlight the best free and no deposit slots and promotional offers for new players.
Some of the Best Slots in the UK
Some of the Best Slots in the UK

How to Start Playing Slots Online

Online casinos are always trying to attract new players by offering bonuses. An online casino deposit bonus usually means that the casino will give you a bonus when you make a deposit. These promotions are usually designed to give you an extra chance of winning when you first sign up to an online casino site.

This is a marketing tool that the operators use instead of spending money on expensive advertising so feel free to take advantage of all the bonus offers on our site! It is a great way of trying out new casinos! Many new non-Gamstop casinos have Felix Gaming as part of their slot catalog together with a lot of other providers.

Welcome bonuses and sign up promotions are common ways for new UK sites to market themselves and get people to start playing slots online. By offering players generous bonuses UK online casino websites offer an incentive for players to try out a wide range of great slots.

This is a calculated risk by the casinos because the cost of free spins and potential wins is still low when compared with traditional marketing and advertising in the mainstream media.


What are the most popular slots in the UK?

There are plenty of slot machines from different providers. The big jackpots such as Mega Moolah and Mega Fortune Dreams are among the top choices for UK players. Developers such as Microgaming and NetEnt have really become popular with these big winning slots.

Can I Play free slots with no real money deposit?

You can test slots for free, both here on Casinomir and on online slots websites. Many casinos will offer options to play for free with no real money deposit.

Can I Play Slots with no registration?

ou can many times play slots online direct with no registration or download require. Just go to the browser and click on the game to start playing a slot machine.

How can I win playing slots?

There are multiple ways to win when playing slots online. There are normal rounds with spinning reels but you also have bonus games, wilds and progressive jackpots to compete for when playing slots on UK online casinos.

What is the house edge for slots online?

The house edge on slots online is usually very low compared to landbased games. Depending on the Return to Player Rate (RTP) it can be as low as 2 %. This is based on the average payout and some games will be more volatile than others.

What slots online have the best RTP?

In our slot reviews you can read about the RTP on all slot machines. You can also compare and filter in our list here on the website to order to find online slots with great return to player rates.

Try New Slot Sites for Free

The online casino industry is booming and there is currently an intense competition between sites. With the increased number of new slot sites in the UK, almost all sites now offer no deposit bonus slots.

This is an incentive for players to try out these new online slot sites and see what they have to offer. In order to increase their membership and encourage players to play on their smartphones and tablets, many new slot sites in the UK also offer very generous unique mobile bonuses.

With so many new bonuses and promotions being released daily, it is almost impossible for players to identify all the great deals and find the best new UK slot sites. But Casinomir can ensure that you don’t miss out on the launch of any new slot sites and exciting deals.

We check the market daily and our reviews, news and information can help you become a more knowledgeable and successful player. We list all the best online casinos in the UK and make sure that you can easily find those amazing no deposit bonus slots.

If you are looking for good quality new slot sites launched in the UK in 2020 with high RTP (return to player), check out our lists and find your new favourite.

Explore new slot sites with no deposit required

The online casino industry has never been bigger, better or more popular, especially in the UK, and with everyone trying to get a slice of this lucrative market, new gambling sites are coming online almost daily. This is awesome news for online gamblers because it means that the choice is almost unlimited, and you don’t have to settle for second rate slot sites with bad graphics and low payouts.

With so many new slot sites competing for your hard-earned cash, the special offers, promotions, and choices can be overwhelming. New slot sites need to pull out all the stops to attract attention, so they often have the best promotions and most innovative new features and games on their sites. And one of the best offers for online gamblers on new slot sites are no deposit bonuses. These great bonuses allow you to check out the site and see if it has the type of games that you like.

New slot sites need to pull out all the stops to attract attention, so they often have the best promotions and most innovative new features and games on their sites.

Slot sites work closely with all the top software providers to develop games and sites that they know will attract new players and keep them loyal. This means that new slot sites that want to survive in the highly competitive online casino markets usually have the best graphics, outstanding sound and the one thing that online casino operators know most gamblers can’t resist – great no deposit bonus offers.

It is always worth being on the lookout for the latest no deposit required offers on new slot sites because these offers are designed to allow you to try out the different games to see what appeals to you before you commit to playing with real money. Make the most of these no deposit bonuses to explore new slot sites, try out a few different games, see what exciting new innovations have hit the market and maybe even find your new favourite online gambling site.

New slot sites typically offer bonus spins where no deposit is required to encourage you to enjoy the thrill of playing slots at their online casino and hopefully turn you into a lifelong, loyal client. The best thing about no deposit bonuses on new or established slot sites is that you’re not risking your own money, but you can keep whatever you win provided you meet the wagering requirements of the site. Finding great new slot sites with the best no deposit bonuses has never been easier. Simply use Casinomir to filter our extensive database, explore new slot sites and find the best no deposit offers.

How to find the best slot sites with no deposit?

There are many great new and established slot sites out there and finding the best ones can be time-consuming if you try to do it alone. But fortunately, you don’t have to do it on your own, Casinomir is here to help to find the best new slot sites with awesome no deposit offers in 2020. Not only do we scour the internet for slot sites with the best no deposit bonuses, but we also negotiate unique deals and promotions with the slot sites featured on Casinomir. When we find a slot site that we like, we talk directly to the operators and this enables us to offer you unique no deposit promotions that you will not find on any other sites.

Slot sites and their promotions can vary greatly, and it is not always easy to know which sites are offering the best bonuses. The quickest and most convenient way to find the best slot sites with no deposits in 2020 is to use our extensive database and filter it according to your unique requirements. You can decide what you are looking for and we will help you find it quickly so that you don’t waste any of your valuable playing time.

Here are some new slot sites with a free sign up bonus

Competition between slot sites in the UK has never been fiercer. The online casino industry is booming but all the sites are competing for a limited customer base. This is awesome news for online gamblers who love slot sites because there are loads of great sign up bonuses that you can take full advantage of.

Free spins no deposit sign up bonuses, where you can still win real money, are almost compulsory for new slot sites.

No matter how fast or smooth a site is, how cool the graphics are or how innovative it is, without free sign up bonuses and awesome welcome offers, no player is going to sign up to a new slot site.

It is true that many online gamblers love innovative technology and want to be the first to try out something unique, but new slot sites with the best free sign up bonuses are still the most attractive to both new players and old hands.

How a free spins sign up bonus typically works:

  1. You sign up to a new site
  2. You get a number of free spins as part of your sign up bonus
  3. You can immediately spin the slots for free, with no deposit, and keep any winnings provided you meet the wagering requirements
  4. Free spins are typically only valid on one game at a time and the value of the spins will vary according to the slot site and the promotion

New slot sites in the UK need to generate a lot of hype to get noticed so they always make sure that their signup bonuses are well advertised. But with so much advertising and promotional hoopla, how do you know which slot sites are currently offering the best free sign up bonus?

The answer is easy, you simply look on Casinomir. We have done the legwork for you and identified the slot sites with the best sign up bonuses and gathered them all on one convenient website.

Get free spins on slot sites

Free spins are awesome. They are fun, you can win without spending your own money and who doesn’t like something for nothing. There is an abundance of slot sites that offer free spins and all you need to do is find the ones that have the slot machines that you like best and enjoy hours of free entertainment.

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When you look for free slot game sites it is important to know that there is a difference between Extra Spins and Free Spins. This is not just a marketing gimmick. According to UKGC regulations introduced in 2018, slot sites can only offer free spins if no deposit is required as part of the offer. If a deposit is required, then the slot site or online casino needs to use the phrase “extra spins”. This regulation was introduced to make online gambling more transparent and less misleading for players who are new to the industry.

Finding awesome free slot sites has never been easier. At Casinomir we have made it our mission to search the internet for the best free slot machine sites; review them, rate them and add them to our list of featured slot sites. We are constantly updating our comprehensive list of slot sites offering free spins so simply use our database to find the best slot game sites and enjoy hours of free fun.

What Makes Casino Game Providers so Important?

First of all, online casinos never create casino games themselves. The casinos collaborate with different game providers in order to offer their players a wide selection of casino games. If you want to identify the best new online casinos, look at which game providers they have before you start playing.

But which software providers are the best? This is a tricky question to answer because every player has different preferences. In general, Microgaming and Net Entertainment are regarded by many as the best game providers in the online gambling industry. 

We at Casinomir believe that having many different game providers is a huge advantage for an online casino. The more casino games a site has the more options the players have. There are some excellent new up and coming game providers like Yggdrasil Gaming and ELK Studios. The two best live casino game developers are Evolution Gaming and Net Entertainment. Not only do they have great graphics and functionality, but they also offer good casino bonuses and free spins. 

Today, many casinos offer the same casino games and look quite similar. As a player, this may make no difference to you but at times things can get a bit boring. New online casinos are trying to increase their market share by offering cool sites that fill a unique niche in the online gambling industry and it is worth looking out for these.  If you click on one of our game provider reviews on this page you can quickly see all the casinos that offer specific software providers games.

How to Compare Different Providers?

Firstly, you need to know which types of casino games you are looking for. In general, the best slot machine games are developed by Net Entertainment and Microgaming. The best live casinos come from Evolution Gaming and Net Entertainment. However, it is up to you to try out different games from different providers and make up your own mind. You can easily compare the jackpot sizes and the average RTP on slot machine right here on our site. Each provider has its advantages and disadvantages.

What is the Best Software for Real Money Casino Games?

It’s difficult to choose the best provider in this category. It all depends on what type of casino games you like. At Casinomir, we think that Net Entertainment is currently the number one game provider when it comes to slot machines. If you want to play live casino then we believe that Evolution Gaming is the best. There are many new casino providers that are now offering a lot of fun, cool casino games, so it is worth trying out various providers to find out what you like.

What About Mobile Casino Software?

Ten years ago, it was almost impossible to play casino games on your phone, but today, there are more people playing slots from their smartphone than from their desktop computers.

When providers create new slot machine games, they always focus on mobile options first. It doesn’t matter if you have an iPhone, Android or a tablet, you can play all games directly in your browser without having to download a large or complex app.

Who are the biggest slot game providers?

There are some big online gaming providers out there that are producing the best and most exciting online slots for all players to enjoy.

Evolution Gaming

Evolution Gaming has used their innovative software to become a world leader in the online casino industry. They have a wide selection of games optimised for every device’s operating system and screen size, mainly within the live casino space.

IGT (International Game Technology)

This multinational gaming company has the largest number of slot game themes in the industry and offers a wide range of online slots that target specific player segments. IGT enables players to experience their favourite games across all channels., on many sites.


Microgaming is one of the leading software providers in the online gaming industry. Microgaming is responsible for bringing players imaginative online slot games like Cash of Kingdoms, Jurassic World, Icy Gems, Crystal Rift, and many others.


NetEnt is a premium supplier of online slots popular with players around the world and their games pack a serious punch. They have the knowledge and experience to produce some of the best online slots, including Gonzo’s Quest, Starburst, Dracula, The Invisible Man and many more. The superior graphics and sound enhance the online gambling experience.

NextGen Gaming

NextGen Gaming has been producing great games for nearly two decades and is an experienced developer of successful slot games for the online casino industry. Their creations include Queen of the Castle, Jackpot Jester, Kingdom’s Edge and The Wild 3.


As the name suggests, Quickspin’s primary focus is video slots. This Swedish game studio develops innovative games for online gambling sites and has created some of the most awesome video slots. Their portfolio includes Divine Dreams, Tiger’s Glory, Bigbot Crew, Ark of Mystery and many other favourites.

Red Tiger Gaming

Founded in 2014 by a group of online gambling industry veterans, Red Tiger Gaming is another leading supplier of online casino software. They are the creators of fun slots like The Greatest Train Robbery, Gemtastic, Jack in a Pot and Pirates Plenty.

Yggdrasil Gaming

Yggdrasil Gaming is a provider of superior online gaming solutions for igaming operators and provides gaming content to some of the world’s leading online casino operators. They are responsible for bringing you games like Trolls Bridge, Baron Samedi, Dark Vortex and Nitro Circus.


Swedish game studio, ELK Studios, uses elegant animation and advanced algorithms to develop highly entertaining video slots and tools for the online gambling industry. Their portfolio includes The Wiz, Valkyrie, Vegas Diamonds and Joker Gems.

Play’n GO

Play’n GO is an award-winning game producer and leading online casino platform supplier. They are the makers of well known games like Raging Rex, Star Joker, Dragon Maiden, Gunslinger Reload and many other exciting video slots.

Blueprint Gaming

Blueprint have been around since 2008, but has recently established themselves as one of the most popular UK slot game providers. Their games are filled with fun and colour. At the time writing, over 40 casino brands offer the Blueprint Gaming slots in their range of games.

Big Time Gaming

Big Time Gaming is one of the top 3 most popular slot providers in the UK, according to recent market research. Big Time Gaming are known for the ‘Feature Drop’, ‘Dualreaction’ and ‘Megaways’ type of mechanism in their games. With more exciting releases coming up, we have more fun to look forward to.

Find your Favourite Slot Machines Online

Everyone wants to know what the best online slots are, on what website to find them and where they can win big money, but there is no simple answer to this frequently asked question. The answer really depends on your personal preferences and on what you consider to be a big win.

There are different levels of winning with slots and you need to decide what appeals most to you. Do you want to win often, or do you want to risk more on the chance that you could win big? Some games are set to payout regularly but these usually don’t payout more than 1000 pounds or euros at a time.

Then there are other games, with bonus modes and free spins, where the potential gains are much higher but they may not pay out as regularly. If you hit the bonus games in an online slot, like Gonzo’s Quest, you can win big on just one single spin. And of course there are also progressive jackpot games where players stand a chance to win millions.

It is important to remember that these games don’t usually payout small or intermediate amounts but they do offer the opportunity of a life-changing win. Players have won millions on Mega Fortune Dreams and Hall of the Gods in the past few years. You can find out more about all the different slot sites, their welcome bonuses, payouts and free slots on Casinomir.

Which slots have the best payout percentage?

Often people who specialise in playing games such as roulette and blackjack think that online slots are complicated and hard to understand. But it is quite the opposite.

To consistently win with blackjack or online poker you have to constantly make conscious decisions to maximize your winnings but slot machines are typically programmed to pay out as winnings between 82% and 98% of the money that is wagered. This is known as the “theoretical payout percentage” or RTP (Return to Player). Every slot machine has a payout percentage andCasinomir can help you find the online slots with the best payout percentages.

It is important to understand that slots have different levels of volatility which define the regularity and variation of wins. Our online reviews take these factors into account in order to provide you with the best information and increase your chances of winning. When you are well informed and working with reliable information, you can determine your own risk levels and decide what slots work best for you.

Games with higher volatility payout less often but the potential to win big is much higher compared to games with lower volatility and more regular payouts. You need to decide whether you prefer to play slots with bigger wins or more payouts. Our online slot reviews will help you find the best paying online slot websites in the UK that suit your playing style.

… slot machines are typically programmed to pay out as winnings between 82% and 98% of the money that is wagered

Casinomir Guides you to UK Slot Sites

Finding the best online casino sites and promotions is basically a full-time job and at Casinomir we do just that. We research the UK online casino market to find the best slot sites and update our lists on a daily basis. That makes Casinomir the best place to find the best online slot games.

Our comprehensive list of UK slot sites will enable you to try out many different types of casinos, without risking your own money, before you choose the one that suits your needs.

Once you have identified an online casino you like, read our reviews and make sure that they offer regular promotions and reward customer loyalty. Many sites may look the same butthere can be big differences between their long-term benefits, VIP programs and rewards for loyal players.

Currently, the best slot promotions on the market are free spin no deposit slots. These are fun to play and offer you the opportunity to win millions without risking your own money.

Slots Online Summary – Start Spinning and Winning

In the highly competitive online gambling industry, most slot sites now offer free spins to introduce you to the games on their site before you commit and play for real money. Free Slots have become one of the most popular hobbies for online gamblers in the United Kingdom.

Instead of spending your free time playing video games and mobile phone games that are fun but offer no real rewards, you can play online slots for free with no deposit and win real money.

Before you sign on to a site and claim your free spins, remember to read the terms, conditions and wagering requirements.

If free spins are called Real Spins then this means that you are allowed to keep your winnings and withdraw the money immediately, but these are rare and most sites have wagering requirements that you need to meet before you can withdraw your winnings.

Free spins give you a great opportunity to win real money with no deposit and no risk, so they are worth playing. You can find out all you need to know about online slots and the best offers in the UK right here at Casinomir. Good luck!