Top 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 2019 and contact us if you have any questions or require more information.

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 NetEnt, Evolution Gaming, Microgaming, NextGen and Quickspin. The best UK slot sites have great graphics, cool 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!

How to Start Playing Slots Online

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.

Not everyone, however, enjoys playing with bonuses. Players are often put off by the wagering requirements that require the player to wager their profit x amount of times. Some new casinos offer bonuses that sound too good to be true, and sometimes they are. Before you commit to a promotion or start playing on any online slot site, you need to read all the terms and conditions, and wagering requirements to ensure that the offer meets your expectations and that your chances of winning are fair.

At Casinomir, we recommend that you examine all the different types of bonuses, promotions and offers to find out which ones appeal to you the most. Our site lists all the top slot sites in the UK and we update our lists daily to bring you the latest promotions and newest websites.

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.
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.
You 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.
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.
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.
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 2019 with high RTP (return to player), check out our lists and find your new favourite.

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.

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.

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!