Online Slot Sites UK Expert Guide

You place your bets, and spin the reels... sometimes you win, and sometimes you lose. That’s online slots in a nutshell, isn’t it?

Not anymore, with new bonus features, side rounds, and enhanced gameplay all taking the genre in innovative and exciting directions. Here we look at how to find the very best slot games online and how your choice of UK slot sites will go a long way to determining your enjoyment of the games on offer.

For this review, we went deep to nail down the best slot sites UK based on our very high standards. These include top-class customer service, great bonuses, free spins and promotions, and, of course, top slots with exceptional RTP.

The list of U.K. online slot sites is seemingly endless and there are new sites launching each and every week. While all of these sites are licensed to operate by the U.K. Gambling Commission, that doesn’t necessarily mean that they are all worth your time.

Luckily for you, we’ve done the legwork for you and whittled down the list based on our in-depth research, which involved a lot of playing time on a large number of online slot sites. Safe to say, no matter which of our recommendations you choose, you’ll know it’s among the best currently available on the market.

Slot Sites UK Quick Review

Below we've listed the top five U.K. online slots sites, giving a quick rundown of their best features and why we feel they deserve a look. You'll notice that all the U.K. slot sites mentioned are full online casinos, but it's important to note that we have focused only on the slot games available at these sites for the purpose of this review.

If you're more interested in the full online casino package including live dealer and table games, check out our review of the top U.K. online casinos.

LeoVegas

LeoVegas is a Swedish online casino that has established itself as a major player in the industry. The slot games section on this site is one of its most impressive features with a huge range of gaming titles from the biggest software studios in the business.

However, while the selection of slot games is top-notch, it's actually the incredibly simple user interface that we like most about this online slot site. It may not have the slick and stylish appearance of some of its competitors, but it's so easy to use and navigate around that you really won't care about its basic style.

Check out our full review of LeoVegas casino UK here.

PokerStars Casino

PokerStars is synonymous with online poker, so the idea that it makes our list as one of the top UK online slots sites might seem a bit odd. The truth is that since entering the online casino industry, PokerStars has gone above and beyond to deliver a top-class product.

There's a wonderful selection of online slot games including many of the top titles currently on the market from the likes of NetEnt and Microgaming. Our top feature for this UK slots site is the incredible welcome bonus for all new users. It's certainly one of the best that we have come across comprising a high-value deposit match bonus and tons of free spins.

Grosvenor

It's not often that a high-street casino brand makes a successful move into the online industry, but that is precisely what Grosvenor has done. One of the largest gaming companies in the U.K., Grosvenor first launched its online slot site in 2007 and has never looked back.

Free spins, a welcome bonus, and promotions along with a user-friendly interface have made this a popular option for local gamblers.

The company's experience in the land-based industry has seen it become one of the most reputable and trusted online slot providers in the U.K. This makes it an ideal choice for a beginner who may be overwhelmed by the sheer volume of slot sites from which to choose.

888 Casino

A true iGaming heavyweight, 888 Casino has been at the forefront of the slot sites U.K. industry for years and it shows. There is an enormous number of slot titles available at 888 with practically every major game developer studio listed as a supplier.

This is by far the best selection of reputable slot titles available in the U.K., and in a market that is saturated, that's saying something. Add to that the fact that new users get a no strings attached welcome bonus that includes 88 free spins with no deposit required, and you can see why this makes our list.

All British Casino

As you may have guessed, the All British Casino is exclusive to the U.K. and for that alone, it could have made it onto our top slot sites list. For almost a decade the All British Casino has been one of the best in the U.K. slot sites industry matching 888 Casino for the number of online slot games it provides.

This is also one of the best U.K. online slots sites for mobile slots as the website interface works perfectly on mobile. Even from within the mobile browser the site has the feel of an app and its speed and functionality make spinning slots on your device a dream.

How to Choose the Best Slot Site UK

As noted earlier, there are hundreds of licensed U.K. slot sites on the market, which makes choosing one a real struggle. This is particularly true for first-time slot players, as it's tough to know where to start and what to look out for in a slot casino. Below, we've listed the various features that we look at closely before recommending our top U.K. slot sites.

Slot Variety:

Classic slots

If you're looking for online slots that are reminiscent of the one-armed bandits in the local pub, then classic slots are the best choice. These are usually simple three-reel online slots with a relatively small number of paylines (winning combinations) that usually involve matching symbols in a row or hitting a wild symbol.

Video slots

Video slots are the most common online slots these days and they are often just like classic slots, but with an additional layer or two of media. What we mean by this is that video slots will have animations featured in the slot games, which give them a much more interactive feel. These animations are often used to play up the slot games theme, which may be music or movie related.

3D slot games

3D slot games offer you everything that regular video slot games do, but with one major difference: Many of those animations for your wilds or winning paylines are in 3D. While they don't quite jump off the screen, they do give a slot game an incredibly slick and realistic feel that is hard to top.

Progressive Jackpot Slots

This type of slot game is the most lucrative, as it includes a jackpot that grows with every single spin of the reels. A progressive jackpots slot game allows players from all over the world to contribute to the jackpot, so in many cases the prize could be in the millions. In fact, the largest progressive jackpots slot game ever was around £16.5 million. It was won on the Absolutely Mad Mega Moolah slot game in April 2021.

Multi-payline slots

These are online slots that have a large number of winning paylines. While most online slots these days will feature multiple paylines, there are some that have a huge number of combinations that result in a win. For example, most progressive jackpots will have a large number of paylines for smaller prizes that lead to the larger prize.

Bonus Game Slots

As you may have guessed, bonus game slot games involve a side game that is usually accessed by a combination of wilds in the regular reels. These games are often free spins, with better prizes and better odds of winning across multiple paylines.

Slot Sites U.K. Welcome Bonuses & Promotions

With so many U.K. slot sites on the market, it's no surprise that a strong welcome bonus and ongoing promotions are the two main ways that operators pull in new customers. These can offer great value and ideally, any promotion or welcome offer will be a combination of the bonuses listed below.

Free Spins

This is the most common promotion at any online slots site. Free spins are usually tied to a specific slot game or selected games from a particular game studio. Free spins can be a great way to test the waters and see if you like a certain online slot before spending your own money on it.

Free spins may also have some wagering requirements that mean you need to make a specific wagering contribution before you can withdraw any winnings. Free spins expire after a set period.

No Deposit Bonus

This type of bonus is becoming much more popular of late, as U.K. slot sites compete for users. The no-deposit bonus offers you a chance to play without making a deposit. All you need to do is sign up for an account and play, much like the 888 Casino bonus mentioned earlier.

Deposit Match Bonus

A deposit match bonus is when the slot site will match your deposit at a specific rate. For example, a 100% deposit match bonus up to £200 will see your deposit matched up to a maximum of £200.

Loyalty Programmes

Linked to the above, loyalty programmes offer players ‘replay value’ because they reward you for playing your favorite games. Loyalty points are gained and can be redeemed on free spins, reload bonuses, and more.

Free Play Mode

It is well worth trying out a number of slot games before deciding which you want to wager real money on. And that's why free play mode is so important; you can ‘try before you buy’!>

Mobile U.K. Slots Sites

These days it's easy to assume that there's an app for everything, but that's not always the case in the U.K. slots industry.

In fact, many of the top UK slot sites don't have mobile apps at all. That said, sites like All British Casino have very well-designed mobile sites that make the move from desktop to mobile a breeze with no loss of gaming features or functionality.

Even if you intend to play online slots on your PC, it's a good idea to check the mobile version of the site or its app to see if it's a solid user interface. You'll want to take note of the speed, the availability of games, and how easy it is to make out the symbols on your reels. The controls will also need to be big enough to access but small enough that they don't intrude on gameplay.

While all of our recommended U.K. slot sites are mobile-friendly, our top mobile site is All British Casino. Its design is top class giving the site a mobile app feel.

Software Provider

When choosing a U.K. slot site, it's worth checking out which suppliers the site has for its slot titles. There are scores of game studios in the industry, but the knees listed below are among the best. While your site may not have games by all the providers listed, it should have slots from at least a few.

• Microgaming

• PlayTech

• NetEnd

• PlayNGo

• Red Tiger Gaming

• Pragmatic Play

• EGT

• Nolimit City

• Big Time Gaming

• IGT

Online Slot Tournaments

Online slot tournaments are a fun addition to the slots industry that are becoming popular. In these tournaments, players must play a specific slot for a set period of time. The player with the highest amount won at the end of the tournament is the overall winner. Slots tournaments aren't an essential feature to have, but they certainly offer a fun way to change things up a bit and add a little excitement to your play.

Slot Sites Payment Methods

The majority of U.K. slot sites will offer several payment methods for both deposits and withdrawals. These will most likely include:

• PayPal

• Debit cards

• Bank transfers

• Neteller

• Apple Pay

• Skrill

It's worth noting that the U.K. has banned the use of credit cards to fund online gambling accounts, so only debit cards can now be used. 

A solid slot site will offer at least two payment options, which is essential as it’s always good to have a backup option should you have some issue with your main payment method.

Slot Sites RTP

This is perhaps one of the most important aspects of slot sites in the U.K. that every player should spend some time learning about.

RTP means return to player and it represents the amount that the slot pays out on average. It is usually represented as a percentage or based on £100 in wagers.

So for example, if a slot has an RTP of 97.5 that means that for every £100 wagered, the slot will return £97.5 on average. Of course, this is just an average based on all gameplay and not just yours. You could, in theory, wager £5 and strike it lucky with a jackpot win.

This means that the higher the RTP, the better odds you have for winning. So, slots titles with high RTPs are an absolute must at the best UK slot sites.

The U.K. Gambling commission requires that a slot site must list the RTP of every slot game.

Finding the Best Slot Sites UK

Here's what you should factor in when drawing up a checklist that identifies the best UK online slots.

We've mentioned bonuses and promotions already, and while it is tempting to focus on the ‘free stuff’ there are plenty of other items for consideration.

Think about payout percentages. These Return to Player (RTP) rates determine how often you can expect to win when playing a particular slot. It's not a perfect science, but the percentage outlines your win ratio if playing an infinite number of times. Some slots are slow and steady earners, while others offer high variance where wins come rarely, but at a higher rate of return.

There are some names in slot game production that are almost a guarantee of quality. Software developers such as NetEnt, Microgaming, and Playtech continue to produce the most playable and innovative games around. If a slot site carries an extensive collection of their releases then you won't go far wrong.

Another thing to think about when considering the best of online slots is how the game(s) look on your preferred device. For instance, some older sites haven't really been designed to be compatible with newer smartphones and tablets, whereas others have mobile playability in mind. If you plan on playing slots on your phone, make sure the site has been built to make the most of the technology

PayPal Slot Sites U.K.

PayPal is a convenient option to fund your online slot account. It's super fast and extremely reliable and offers a certain level of security as your financial details are not shared with the casino. All the U.K. slot sites recommended in this review offer PayPal as a deposit and withdrawal method.

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New Slot Sites in the U.K.

The U.K. slot sites industry is developing at an exponential rate and there are so many slot sites and new online casinos launching each and every week. The newest of these sites may not yet have established themselves as reputable players in the market, but they are fully licensed by the U.K. Gambling Commission.

Slots Sites with Welcome Bonus

Practically all U.K. slot sites offer a welcome bonus of some kind, but these can vary in value a great deal. Below are some of the best currently on the market.

Slot Sites U.K. Licensing

All U.K. slot sites and casino sites must be licensed to operate by the U.K. Gambling Commission.

Operators must undergo suitability checks before launching and are subject to random checks and audits to ensure that they are fully compliant with the terms and conditions of their license. This includes offering responsible gaming tools to players allowing them to take a break or to self exclude on a permanent basis.

Slot sites and online casino sites that are found to have insufficient security or social responsibility measures are warned and sometimes fined by the U.K. Gambling Commission. In some extreme cases, a license may be suspended or even revoked.

Customer support at UK Slot Sites

Customer support can be a sticking point at many online casino sites in the UK as many of the smaller companies don't offer a complete range of customer support options. At the bare minimum, these should include at least one point of contact for the slot site. Ideally, this would be in the form of live 24/7 chat or phone service.

What Makes the Best Online Casino Slot Sites?

You may want to play the very best online casino slots, but the games are only part of the equation. Consider your user experience: if the site takes an eternity to load, or is a nightmare to navigate, then your enjoyment is going to diminish exponentially.

Also, be sure to ponder whether this is a trusted site or not. Make sure it has security provisions in place to protect your personal data and read impartial reviews about the site before making a deposit.

The best online slots U.K. platforms will hand out handsome bonuses to new and existing players, but a word of caution: all that glitters isn't always gold. Think about the wagering requirements attached to any offer and how realistic they are to ‘play through’.

And once you have used that welcome bonus, what else does the slot site offer? Are there ongoing promotions that tickle your fancy? Some sites use welcome bonuses to hook new players, but then offer very little from that point on.

Slot Sites UK FAQs

What are the best slot sites for winning?

That's a tough one to answer, as there are so many sites and so many slot games to choose from each with its own RTP (return to player). Ideally, the best online slots sites are those that have multiple slot games with high RTPs or those with large progressive jackpot games.

What is the best site for slots in the U.K.?

That depends on your personal preference. For example, a player who enjoys a wide selection of games might go with 888 Casino, while a player who wants play slots online through a mobile device may choose All British Casino.

What is the most popular online slot game?

This can change depending on new releases, but one of the longest-running popular titles is Starburst. Any slot with the Megaways progressive jackpot games mechanic will also be quite popular too.

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