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There are literally hundreds of thousands of amazing free slots games UK players can enjoy, with great themes and various, fantastic features. Which of these became the most popular though? Let’s take a look!

Gonzo’s Quest Megaways

Gonzo's Quest Megaways is a 6x7, adventure-themed slot from the well-known provider Red Tiger. The great thing about it is that not only does it have a medium volatility and a great RTP rate of 96%, but Gonzo's Quest Megaways also has a fantastic number of pay lines and a very good max win, on top of a bunch of fantastic features.

Primate King

Another very popular slot, also from the same provider, Red Tiger, is Primate King. Featuring an RTP rate of 95.6% and medium volatility, Primate King is a very vibrant and beautiful slot that has many helpful features, such as Primate Wild/Smash, Progressive Wild, Gold Coins, and more!

Sweet Bonanza

Impressive maximum win potential of 21,175x your bet is not the only reason why so many people love Sweet Bonanza by Pragmatic Play, as it also provides so many amazing game modes - Ante Bet, Tumble Feature, Free Spins, Special Symbols. So yeah, we can easily see why Sweet Bonanza is considered one of the best online slots in UK.

Gonzo's Quest

Gonzo's Quest is a slot by NetEnt and has a 5x3 layout, offers 20 paylines, and has high volatility with a 95.97% RTP rate. Aside from the cool graphics and smooth, mobile-friendly gameplay you also get to enjoy plenty of special features like Free Fall, Avalanche multipliers, and Special Symbols - all this would be very helpful as you attempt to hit the max win of 2,500x your bet!

Legacy of Dead

One of the most popular UK slots from Play'n GO  Legacy of Dead is a 5x3 game that takes you on a trip to Ancient Egypt, where you will try your luck getting that sweet max win of 2,500x your bet. The title features special symbols, Free Spins, Expanding Symbols, and the Risk game!

Big Bass Bonanza

Who says fishing is boring? Big Bass Bonanza proves otherwise! released by the industry's giant, Pragmatic Play, this 5x3 slot features a lovely, vibrant aquatic design, a great RTP rate of 96.7%, and high volatility. You have several good features, that will no doubt help you on your way to the maximum prize of the game - 2,100x your bet. These features are special symbols, like Wild and Scatter, Money symbol, and Free Spins.

Wolf Gold

We can’t get enough of Pragmatic Play and neither do many players, as Wolf Gold is also considered one of the best slots out there. Featuring medium volatility, and an RTP rate of 96% the slot provides an awesome maximum win potential of 5,000x. We also can't forget to note that the design of Wolf Gold is very beautiful, with bright vibrant colours and a lovely, serene atmosphere.

Rich Wilde and the Book of Dead

Play'n GO also released one more amazing Ancient-Egyptian-themed slot - Rich Wilde and the Book of Dead. In this 10 paylines, 5x3 slot you will join a famous adventurer Rich Wilde on his trip to a mysterious Egyptian tomb where you will discover magnificent riches. How magnificent? We're talking about a max win of 5,000x your bet!

Starburst

Starburst is widely considered one of the best slots from NetEnd. This space-themed game has low volatility, an RTP rate of 96.09%, and 10 paylines with a max win potential of 500x your bet. What is especially captivating about Starburst is its theme, which features not only amazing visuals but also very captivating and enchanting music that truly gives you a feeling like you’re in the space.

Jammin' Jars

Of course, we can’t forget to mention fruit slots, and among the most beloved online slot machines in UK is Jammin’ Jars! is an 8x8 slot by Push Gaming, with an RTP rate of 96.83%, medium volatility, and a simplistic but funky vibe of fruits and disco. In addition to the bright design and a max win potential of 20,000x (!), you can also enjoy special features: Cascading and Collapsing, Jam Jar symbol, Free Games Feature, Rainbow Feature, and others!

If you’ve ever visited the slot sites in UK, you may have heard how vital the license is. That is true: license is one of the most if not the most important things to pay attention to when you’re looking where to play UK slots online, because it not only shows that the casino/provider is reliable but also has several other advantages.

For one, a specific license allows for the slot to be available in a certain country, because in several countries, like Canada, for instance, it is illegal to provide gambling services to players without a license issued by the government. Other than that, the license signals that the slot/provider/casino is legal and can be trusted, for it was checked by authoritative licensing bodies. Some of the most popular you can find are:

Slots RTP Verified

RTP is an acronym for Return to Player and this is a number that states the expected ratio between the amount of steak you make and the payout the slot offers. Usually, the RTP rate stays the same, no matter if you just check out free online slots in UK or play for the real money option.

In order to determine the fairness of the game, it is very important that the RTP is checked and verified by the regulated bodies seeing how an average player can't confirm the veracity of the Return to Player. For that purpose, there are several reliable and independent testing companies that carefully monitor, analyze it and then verify whether the stated RTP is accurate.

• Gaming Laboratories International (GLI)

A popular and reliable regulating body, Gaming Laboratories International aka GLI is focused on providing high-quality, unbiased testing and certification services to the gaming industry. They have a great team of expert mathematicians, engineers and quality experts that carefully and thoroughly certify equipment, and such a responsive approach made GLI one of the most respected regulatory companies out there.

• eCOGRA

Established in 2011, a London-based regulatory organization e-Commerce and Online Gaming Regulation and Assurance aka eCogra is a reputable organization that specialises in the certification of online gaming software and systems. Protecting and watching over the fairness, legality and quality of the gambling industry eCogra was awarded the United Kingdom Accreditation Service and respected for their professional approach. So anyone that passed the test for quality from this regulatory body is worthy of respect and trust.

• Gaming Associates Europe

Another popular and reputable UK-based regulatory body is Gaming Associates Europe. Working in more than 30 jurisdictions, and with over 1000 completed audits, GAE is a reliable, and respected company that full range of testing and security services for Internet and Terrestrial gaming, as well as lottery, eCommerce, wagering, and information technology industries. They check and make sure that gaming is fair, secure, and auditable.

• iTech Labs

An Australian independent testing and certification laboratory, iTech Labs has been operational for almost 2 decades now, offering the highest level of services with a focus on the security of the player, and fairness. iTech Labs is responsible for overseeing and testing software, casino games, poker, and sports betting, and they also closely work with many popular providers, such as Playtech, NetEnt and others.

When you are choosing online slots, it’s worth paying attention not only to the games but also to the companies that deliver them. Today, the industry is packed with decent vendors that take care of the quality of their products. So our team gathered the names of top-10 vendors that produce the best online slot machines out there!

1x2 Gaming

This talented team entered the gambling sector in 2003 and had enough time to prove how skillful its developers are. You will get access to a catalog of 150+ free online casino slots and this portfolio will please you with machines like Celebrity in the Jungle, Classic Fruit, and Heart Bingo Branded Megaways.

Microgaming

And here comes 1 of the gambling pioneers. This is a strong gambling company that was established in 1994 and managed to produce a bunch of gambling products for land-based and online areas. Additionally, the company is running The MPN, its own online poker network. Having 500+ products in its catalog, the vendor offers popular slots online like Immortal Romance and Mega Moolah.

Playtech

If you appreciate classic slots with more standard features, Playtech is a good option to find them. The company joined the gambling industry in 1999 and has been on the London Stock Exchange for over 10 years. Nearly 600 of their games are certified by the Alderney Gaming Commission and many of them, including Jackpot King, feature jackpots.

Endorphina

The brand that is working on vibrant games with unexpectedly thrilling features is Endorphina. It’s been in the game since 2010. The company was established in Prague, Czech Republic, but gamblers can access these slot online free casino games globally. Its famous titles are Book of Lady, King of Ghosts, and Gems & Stones.

Netent

The following company has a lot to offer thanks to its extended experience of over 20 years. The brand is Swedish, which speaks for its credibility. Its slots are known for huge jackpots, immersive features, and amazing 3D graphics. The list of its casino slots online includes Divine Fortune, Starburst, Narcos, Dead or Alive, and more.

Play'n GO

If we are talking about well-known Swedish brands, it’s worth mentioning another great company, which is Play’n Go. It was started in the 1990s, covering the needs of land-based operators first. Yet, today, it’s a global online vendor that has produced over 300 mind-blowing online slots games. You will be able to try out legendary machines like Book of Dead and Fire Joker with features like expanding symbols and jackpots involved.

Thunderkick

Swedish developers definitely know how to make gambling more immersive. Thunderkick is another vendor established in Stockholm. It was established in 2012 and in 2014, the company managed to become famous due to the massive release. Its software is neatly crafted and the portfolio of 50+ machines will please you with slot machines online like Baron Bloodmore and Esqueleto Explosivo.

Push Gaming

The products from Push Gaming are considered to be legendary as each player has heard about Jammin’ Jars and Fat Drac. But that’s not all yet as the vendor features 40+ great slots, including a bunch of new titles like Big Bamboo delivered in 2022. As for the brand, it was established by Winston Lee and James Marshall in 2010.

Yggdrasil

Another outstanding gambling brand that entered this vector in 2013 is Yggdrasil. Its head office is based in Malta and the company is providing HTML5-powered slots in order to provide online slot games according to the iSense technology. The number of thrilling games that the vendor provides exceeds 100 and among them, you will find well-known slots like Golden Fish Tank, Doubles, and Holmes and the Stolen Stones.

Nolimit City

The following vendor also originates from Stockholm, Sweden. Its main goals are to deliver top-notch gambling services for both players and operators. The offices of Nolimit City are situated in Malta in India. Since its inception in 2008, the company has already produced 50+ mind-blowing games, including Thor: Hammer Time and Ice Ice Yeti.

Video Slots

What makes video games interesting is that they’re based on elements of pop culture. In other words, you’ll find that these slots are based on movies, TV shows, and even popular book series. They’re also coupled with amazing graphics and features to keep you entertained.

Fruit Slots

These slots are also known as retro or classic slots because they resemble the first slot machines. In other words, they come with a fruity theme and you’ll see oranges, watermelons, grapes, lemons, and other fruit all over the reels. They typically come with 3 reels, but there are several exceptions.

Jackpot Slots

As the name suggests, jackpot slots are slots that offer a jackpot. This can be a single jackpot or multiple ones. Also, the jackpots can offer a fixed prize or they can be progressive jackpots. The progressive ones come with a no-limit prize.

3D Slots

The 3D slots are similar to the video slots, but they have an added attraction. These slots have 3D animations of characters that can interact with the game. For example, a character might kick or punch the reels to nudge certain symbols. That’s what makes 3D slots unique.

Megaways Slots

Megaways slots are slots that have multiple ways to win. They typically come with 6 reels and each reel can have a different number of symbols. The number of ways to win expands as you get winning combinations and you can reach a total of 117,649 ways to win.

Best Bonus Buy Slots

Have you ever heard about free online slots where bonuses can not only be earned naturally but also bought? This may be slightly risky, but it’s a good option for those who want to reach free spins at once. On average, you pay 70x to 100x your bet to trigger the feature.

Best Slots with High Variance

The risks of playing slots are always present, but some of them are higher, while others are lower. That’s why the games have 3 basic volatility levels, and we are going to overview high volatility, which stands for high risks and big rewards.

Best Slots with Low Variance

Launching online slots free versions means that you don’t want to take risks. But if you still want to place a small bet, a good version for this position is the list of slots with low variance. The risks are minimized, while the gaming session can last longer.

Yes, that’s right, your phone can be used not only for making calls but also for reaching the best online slots. All modern games are delivered according to HTML5 technology, which makes them compatible and available on all devices.

Android slots

As the market of electronic devices is packed with Android gadgets, you can use all of them to play casino games. Open online slot machines on your Sony, Samsung, and other devices powered on Android. To do this, open your browser or install an app from the official site of your casino.

iPhone slots

Well, Apple users also won’t miss that real fun gamblers are provided with. All iOS devices equally support casino games and allow players to launch different slots on iPhones and iPads. Additionally, players can place real stakes, activate bonuses, and do other things via a portable Apple gadget.

Seeing how there are so many online casino slots available in UK slots available, you also have a huge selection of slot themes to choose from. Whether you like a more casual, and fun experience with fruit slots or inspired by TV shows/movies, or want to dive into the world of horror, you have the option to do so, and can always find the best game for yourself. Moreover, there are a bunch of free UK slots to check out as well, courtesy of the demo! So, what are the most common and popular types?

Fruit Machine Slots

Of course, we open up with a classical theme we all know too well - fruit slots! Some may think that fruits are boring but you can't deny that these types of slots have that sweet (no pun intended) nostalgic vibe to them. Back in the day when we didn't have a lot of themes to choose from, fruits were the only ones we could enjoy, and for many, it was the first slot theme we played. So a lot still love fruit-themed slots to this day, and they are still pretty popular.

Sport Slots

Sport is fun and exciting, with an element of risk and challenge added in. As you can imagine when you combine an already thrilling activity with gambling it creates a whole new experience, so many players adore. So of course sport-themed slots will remain one of the most popular ones for a long time.

Gems and Jewels Slots

In addition to fruits, jewel-themed slots also have that nostalgic vibe to them, and many of us have started our gaming journey by playing gem/jewel slots. Granted, nowadays with the wide variety of available themes, this one can seem somewhat too simplistic, but a lot of gamblers still enjoy having fun with shiny jewels!

Adventure Slots

The adventure theme is easily one of the most popular and exciting ones out there and it's pretty obvious why! After a hard and long day, nothing can be better than just relaxing, launching your favourite adventure-themed slot, and immersing yourself into the world where you venture out on an epic quest to another galaxy or discover an ancient temple filled with riches!

Animal-Themed Slots

Animals are cute and lovely so it's no wonder that animal-themed slots remain one of the most popular ones. And you have such a wide collection of games to choose from, where some slots are very realistic, while others are focused more on the cartoony elements, with an animal design that will give you a cuteness overload.

Mythical Slots

The theme of gods and fantasy worlds is always interesting, especially when mixed with amazing graphics. Luckily for you, there are plenty of mythical slots to choose from, seeing how Greek mythology, fantasy, and magic are beloved by many providers, and everyone has some appropriate game in their portfolio.

Horror Slots

Horror games are a blast and are always fun to play even when it's not a Halloween season yet. Some providers release an occasional horror-themed lot, to spice up their portfolio, while others are heavily focused on the horrific, spooky vibe. The first provider of such games that comes to mind is very well-known and beloved by many, Nolimit City.

Pirate Slots

Given how many amazing pirate-themed slots we have, and the demand for them, it seems that many players are all about the life of danger out on the sea. What is great is that there is a dime and a dozen of amazing pirate games, so finding the one that will become your favourite is very easy! Just beware of the Kraken…

Egyptian Slots

Ancient Egypt is a very common theme that a lot of providers gladly use in their slots. Temples, mummies, cats, scarabs, and huge riches - there is a very great and interesting vibe in the slots of this type, and a lot of players that enjoy Egyptian-themed slots seem to agree.

Wild West Slots

Western fans are always down to check out the Wild West slots where they can become the next Dirty Harry! Luckily, the UK has many free slots options to choose from, with games of various designs and features, so you will have no issues finding the best option!

Viking Slots

Much like Wild West and pirates, Viking-themed slots are all about the life of freedom and thrill, so no wonder why they are also so popular. Some slots of these thematics are centred around the Vikings themselves, while others are inspired by the Norse mythology, combining both Viking and Mythology/Mystery themes into one!

Oriental Slots

Asian-themed slots are always popular because let's be honest, Asian culture is very interesting and with a good design, you get some breathtaking experience playing the slots of this theme. Just think of how amazing it is to play the slot while there is calming oriental music playing in the background and you are surrounded by, for instance, Sakuras? So kawaii!

Movie Slots

Movie slots are always a very fun and exciting experience for all cinema enthusiasts (and not only) and are always appealing to a lot of gamers. Luckily, when you are blown away by some movie, it's great when you can also discover a slot inspired by that same movie, and check it out!

TV Show Slots

Of course, when we talk about movie slots we can’t forget to mention the TV show slots as well! There is a wide variety of options to check out, like a very popular online casino slot in UK - Game of Thrones Power Stacks!

Christmas Slots

Ah, Christmas slots always have that jolly and sweet vibe to them, that especially puts you in a good mood around Christmas time. But hey, no one says you can’t play them during summer, you do, especially given that Christmas-themed slots always have a lovely atmosphere, with great music and delicious gingerbread men.

Romantic Slots

Many people are always down for some love and romance, and the romantic-themed slots are here to appease you! Hearts, flowers, cute teddy bears - you get it all in these types of slots, which are really adorable and sweet.

Online slots are very popular among UK players, and interestingly, it is reported that on average the citizens of the United Kingdom spend about £67 on slots, which is a lot more than they spend on other casino products the (£36) and real event betting (£45). Why are online slots so popular, you may wonder?

There are many reasons for that: convenience, better RTP (on average the online slots have a Return to Player rate of 96% or more, while land-based casinos only provide about 70-80%). Of course, there is also the fact that there are so many online slots to choose from, with unique themes, and features that you simply have a much larger collection to choose from.

Top 10 UK Free Slots

• Mega Moolah by Microgaming
• Thunderstruck by Microgaming
• Cleopatra by IGT
• Zillard King by Red Tiger Gaming
• Games of Thrones 243 ways by Microgaming
• Da Vinci Diamonds by IGT
• Immortal Romance by Microgaming
• Eye of Cleopatra by Pragmatic Play
• Big Bass Bonanza Megaways by Pragmatic Play
• Hexbreaker 3 by IGT

Thanks to a wide range of opportunities for gamblers, there are different ways to play online slot machines. And the main 2 options are free and real-money games. During both modes, the features of played machines are the same, but the crucial difference is in the way you pay for your games. Here you are to read more about both modes!

Gambling is a serious thing as it’s connected to your budget, so you should take certain precautions before launching online casino slots. First, select only licensed casinos with responsible gambling tools in-built. Plus, remember to manage your bankroll and monitor it during the gaming session. Stop playing in time to be able to come back the next time!

Perhaps, you aren’t sure what title to choose or don’t want to sign up to simply have a few free rounds. In this case, free online slots games are a great way to go. You don’t have to take care of installing software to launch these games or opening an account to get started. The games are free and our top-10 list is available over here!

Our site, as well as top online casinos, offer all popular slot machines to play for free online. This means that gamblers can examine different options of these games without paying a dime. Yes, it’s completely free entertainment thanks to the demo mode all gamblers can get access to!