Best Slot Sites UK – 2023

What are Online Slot Bonus Sites?

There are tonnes of different slot sites online. Some are traditional online casino sites, while others are sportsbooks that have launched a video slots section. Others are bingo sites that have launched slot games and online Slingo to complement their traditional online bingo offerings.

There are, however, a large number of pure-play slot sites that offer nothing but the very best slot games and video slots online. These provide players with some of the broadest collection of titles, ensuring you get access to the ultimate online slots experience.

We at Gambling Deals will leave no stone unturned when we analyse and review slot bonus sites. This means you are guaranteed a high-quality slots experience whatever site you choose to sign up to.

How Slot Bonus Sites Work

If you’re not sure how slot sites bring to market such amazing slot games, then let us clear things up. When you click through to join slots sites, you will notice that many of the slot games available on the site are similar to those on other leading casino sites. That’s because it is slot game makers who develop the video slots and slot games, they then lease them to slot sites which offer you the chance to play. What does this mean for you when you’re trying to find the best UK slot sites to join?

Well, firstly, you need to make sure that the online casino offers the slot games that you want to play. Some mobile slots sites will only provide games made by one or two providers, while others will have a much broader range. What’s more, you will need to assess all of the other things that the site can bring. For example, do they have a wide range of payment methods on offer? Do they have an excellent brand reputation with fantastic customer service? If so, then they’re worth checking out and signing up with. To find out which slot providers each site works with, check out our detailed slot site reviews.

How We Rank And Compare The Best Slots Bonus Sites

Ranking the best UK slot sites is a process our team completes with care. Several important factors need to be taken into consideration before we can compile our top sites list, regardless of the promotion on offer. Here’s a breakdown of the things we look at when comparing the best online slots and online casino sites.

Licensing 

First and foremost, it’s crucial that slot sites are licensed by approved regulators such as the UK Gambling Commission (UKGC) and Malta Gaming Authority (MGA). If a licensed online casino acts unethically, it will face sanctions or could be shut down. Therefore, this ensures players receive an extra layer of protection when gambling online.

Welcome Bonuses and Existing Customer Online Casino Promotions

The slots offers up for grabs at an online casino form an important part of our review. New players will be looking for a generous welcome bonus to get them off to a good start — the most common types being free spins and matched deposits. The best sites keep existing customers entertained with plenty of ongoing promotions too, whether it be slots tournaments, reload bonuses, or a loyalty programme.

Matched Deposit Bonus

Matched deposit slots bonuses are one of the most common forms of welcome bonuses out there. When you sign up with slot sites, you will be offered a deposit match or matched deposit bonus that looks something like this:

• 100% Bonus Up To £300

This means that the UK slot site will offer you a deposit match up to the value of £300. For example, if you deposit £200 into the online slot, then you will get another £200 to play your favourite slot games. This means you have an initial betting balance of £400 to start your journey. However, if you place a max bet of £300, this you will get a £300 deposit match.

On top of this, some slot sites will give you even more bonus funds to play with by increasing the deposit match percentage. Instead of giving you 100%, they will give you up to 300%. For example, you will be offered:

• 300% Bonus Up To £300

In this example, if you were to deposit £200, then you will get £600 in total to play your favourite slot games. This is one of the best ways out there to get tonnes of free bonus funds to bet in the best UK slot sites when you join.

Free Spins

Free spins are another great type of bonus that the best slot sites offer. When signing up for an account, you will notice that you can access free spins on certain slot games as a way for you to spin the reels and potentially keep your spins winnings. For example, you might see something like:

• 100% Bonus Up To £100 + 300 Free Spins On Book Of Ra

This type of match bonus gets you 300 free spins on top of your matched deposit bonus when joining the slots site. In this instance, the free spins will only be available on the Book of Ra slot game. However, you will have 300 free spins to try your luck. That is absolute gold to any serious slot site VIP or new player. UK sites will even give you free spin packages to use on any slot games across the site. These types of offers are certainly worth taking advantage of when you see them.

No Deposit Bonus

Another option for new depositors is a no deposit bonus. Regardless of the wagering contribution, no deposit bonuses allow slot players the chance to take up a max bonus bet, without actually depositing any of your own funds. This can either be in the form of a match bonus, or free spins offer. Typical online casino free spins no deposit bonuses will look like this:

• 50 Free Spins No Deposit Bonus

What this means is that you will get 50 free spins, regardless of whether you classify for the new depositor terms. Essentially, you can spin video slots reels without having to risk your own funds. Top brands like PlayOJO offer amazing welcome bonuses on a no deposit bonus basis. Not only do you get free spins, but the bonus valid terms do not require a deposit.

Slot Games Selection

The best slot sites are brilliant at compiling the best slot games online. They partner with all of the best game builders, including Microgaming, NetEnt, Playtech, and Novomatic. They ensure that their game sections include classic slots like Rainbow Riches, Age of Gods, and Starburst. Here at GamblingDeals.com, we don’t just review the best slot sites; we also carry out comprehensive reviews of all of the best slot games online. That gives us the unique ability to assess whether UK sites are bringing you the best slot games.

What’s more, slots sites don’t just care about offering you the best slot games. In fact, top slot brands like PlayOJO, also offer casino games like live casino, blackjack, and roulette. When you are playing with cash funds, or bonus wagering, the best slots sites, and mobile casino sites will always carry a large range of leading casino games.

Slot Jackpots

It’s not only the best slot games that we care about seeing, we want to know that you have access to potentially huge slot jackpots. Some casino sites will offer games with large single payout jackpots, while others will provide games with progressive jackpots where the jackpot builds across many different slot games and sites. Progressive jackpot slots like Microgaming’s Mega Moolah have proven to be extremely popular among players in recent years and some can pay out several millions at a time.

Payment Methods

The best slot sites offer a range of payment methods to suit all players’ needs. Many casino players opt for payment intermediaries like Trustly and e-wallets such as PayPal, Skrill, and Neteller, as they offer fast withdrawals and remove the need to share bank details with the casino. For those on a smaller budget, paying by phone bill with a service like Boku might suit them, or a prepaid card like AstroPay. In any case, it’s important for a casino to offer a selection of instant payout alternatives to complement traditional banking methods such as Visa and Mastercard debit cards. 

Customer Support

It’s essential that casino customers feel they can get the support they need without long waiting times. The best slot bonus sites offer 24/7 live chat support from friendly and helpful advisors. It’s also ideal to have other channels in place to contact customer support, such as phone and email. Finally, a detailed and informative Frequently Asked Questions (FAQs) page is a must. FAQs sections are ideal for players to get quick answers to common queries and learn more about the services the casino offers.

Mobile Capabilities

With so many gamblers choosing to play casino games on mobile, it’s essential for slots sites to offer excellent mobile functionality. The best UK online slots sites offer downloadable native apps for mobiles and tablets. Once you’ve got the app installed, you can jump into the slots action at the click of a button, whenever and wherever the mood strikes. If there isn’t an app available, as is often the case with newer slot sites, we’ll test out the navigation and gameplay via the mobile browser. In addition to optimised gameplay, we’ll be looking for smooth navigation, easy access to customer support, and plenty of payment options — the best mobile casinos make use of Apple Pay and Google Pay so players can deposit quickly and securely.

Site Design and UX

The best slots sites UK put a great deal of thought into how their sites appear to customers, with a unique theme particularly important to help white label casinos stand out. But sites shouldn’t only look the part; they should also load quickly and be easy to use. The very best slot sites UK offer useful filters and navigation tools to help you get to where you want to go quickly. What’s more, we think casinos should put as much effort into designing their mobile sites and apps as they do their regular desktop sites, so this is one of the areas that we cover in our online casino reviews. 

Reasons to Join the Best Slot Bonus Sites

There are plenty of benefits to playing at a top online slot bonus site. The first is that there are a great range of bonuses available for new players to claim. From classic free spins offers to more sizable matched deposit bonuses, there’s something for everyone. And don’t forget, once you’re signed up, the best slot bonus sites offer regular ongoing promotions for existing players to enjoy. Here at Gambling Deals we only provide you with the best slots bonuses around so that you can always find the one that’s right for you.

As well as the availability of different promotions, the best slot bonus sites offer player-friendly terms and conditions. While 35x or 40x wagering requirements are common, there are plenty of slot bonuses up for grabs with wagering closer to 20x, and you might even be able to bag a no wagering or no deposit bonus.

Another reason to sign up with the best slot bonus sites is the availability of different games. While it’s normal for bonuses to apply to selected games, the best sites ensure players can use their free spins on top slots like NetEnt’s Starburst and Play’n GO’s Book of Dead. Once you’ve signed up and completed the welcome offer, the best sites will host a range of different titles, including Megaways slots like Big Time Gaming’s Bonanza Megaways and Barcest’s Rainbow Riches Megaways.

Slots Bonuses Available at Online Casinos

Slots are the most heavily featured games in the world of online casino bonuses, so fans of the genre are in a great position. Check out some of the main types of slots bonuses you’ll find at UK casinos below.

Free Spins

Free spins are one of the main types of bonuses that the best slot sites offer. They essentially allow you to spin the slot reels and potentially win real money with no risk involved, making them a great way to familiarise yourself with a new title. Casino sites will often offer free spins in conjunction with a deposit match. For example, you might see something like:

• 100% Bonus Up To £100 + 30 Free Spins On Book Of Ra

This type of slot bonus gets you 30 free spins on top of your matched deposit when joining the casino. In this instance, the free spins will only be eligible for use on the Book of Ra slot game, but you’ll get 30 to try your luck on its reels. While most offers are only available on specific games, some UK sites will give you free spin packages to use on any slot games across the site. These types of offers are certainly worth taking advantage of when you see them.

No Deposit Slots Bonuses

Another option for new slots players is a no deposit bonus. Regardless of the wagering contribution, no deposit bonuses give slot players the chance to claim rewards just for signing up with the casino. These promotions can be in the form of a match bonus or a free spins offer. Typical online casino free spins no deposit bonuses will look like this:

• 50 Free Spins No Deposit Bonus

With this deal, you’ll get 50 free spins straight off the bat without having to make a deposit. One of the main T&Cs to watch out for with a no deposit bonus is a win cap; that’s a term that will specify a maximum amount you can win from the bonus.

No Wagering Slots Bonuses

Another common stipulation of slot bonuses is the wagering requirement. Players are usually required to play through the bonus value a certain number of times before they can withdraw any related funds. With a no wagering bonus, you can cash out any winnings from the bonus immediately. A no wagering bonus will look something like this:

• 20 Free Spins No Wagering when you deposit £20

No wagering bonuses will still require you to add funds to your account, but you’ll avoid those pesky wagering requirements that often prevent players from actually withdrawing any of their bonus cash. Top brands like PlayOJO offer excellent no wagering bonuses — in fact, the casino made its name on a policy of no wagering requirements on all its offers.

Matched Deposit Bonus

Matched deposit slots bonuses are one of the most common forms of welcome bonus out there. When you sign up with slot sites, you could be offered a deposit match bonus that looks something like this:

• 100% Matched Deposit Bonus Up To £300

This means that the UK slot site will match your deposit up to the value of £300. For example, if you deposit £200 into the online slot, then you will get another £200 in bonus credit to play your favourite slot games. This means you have an initial betting balance of £400 to start your journey with. If you decide to deposit the full £300, you’ll double your money to £600, subject to full terms and conditions.

On top of this, some slot sites will give you even more bonus funds to play with by increasing the deposit match percentage. Instead of giving you 100%, they could give you 200% or more. For example, some sites may offer the following:

• 200% Matched Deposit Bonus Up To £300

In this example, if you were to deposit £100, you’d get an additional £200 in bonus credit to use on your favourite slot games. This is one of the best ways out there to get a wealth of free bonus funds to bet on the best UK slot sites when you join. However, deposit bonuses as large as this will almost certainly come with more restrictive terms and conditions.

Reload Bonuses

Another type of slots offer you’ll find at UK casinos is a reload bonus. These deals work in a similar way to the matched deposit bonuses you’ll kick off with as part of a welcome package. Instead, reload bonuses are for existing customers, and give them a chance to ‘reload’ their casino wallet with cash.

Reload bonuses will be offered to current players, giving them the option to deposit funds and receive some extra bonus credit as a reward. This type of offer may be a one-off scenario, where a player will receive a £10 bonus if they make a deposit of £10 or more, or it may work on a weekly or monthly basis — for example, depositing a certain amount in a given time period to receive a top-up at the end of the week or month.

Rebate Bonuses

Rebate bonuses are also known as cashback, and are another great slots bonus for existing players. Every casino game comes down to chance and carries a significant element of risk — couple that with the inherent house edge built into every game and it’s likely players will lose money in the long run.

Cashback deals help players out by giving them a percentage of their losses back over a given period. Some online slots sites offer daily cashback, while others work on a weekly or monthly basis. Let’s say the rebate bonus stood at 10% — if you lost £20 during a slots session, you’d receive £2 back at the end of the day. This rebate may be withdrawable, meaning you can cash it out straight away, or non-withdrawable, meaning you’d just be able to use it on subsequent game sessions. 

Slot Bonus Terms and Conditions

When browsing different online slot bonuses, terms and conditions are always an important aspect to consider. Promotions that may look the best thanks to large deposit matches or loads of free spins may not offer the best value in the long run due to restrictive rules. Let’s take a look at some of the most common T&Cs you’ll find in the small print of slots deals.

Wagering Requirements

Wagering requirements are one of the main terms attached to slots bonuses. They require players to wager their bonus amount a certain number of times before they can withdraw it as cash. At the very least, this draws out the process of getting your hands on your bonus winnings, but most wagering requirements prevent players from withdrawing the bonus at all. For this reason, unless you’re able to play with a no wagering bonus, it’s best to see these slots offers primarily as a way to have some risk-free fun and get to grips with some new games.

Here’s an example of wagering requirements in action. Let’s say there’s a 30x requirement on a £20 matched deposit slots bonus. Players would need to stake £600 (30 x £20) of their own money in order to convert any winnings from the bonus into withdrawable cash. Until they do so, the bonus money is kept in a separate balance that can’t be withdrawn. With free spins, it’s usually your winnings that are multiplied by the wagering requirement, so if you won £10 from some free spins and 50x wagering applied, you would need to stake £500 to withdraw the £10.

Payment Restrictions

Unless you pick up a no deposit slots offer, you’ll need to place a qualifying deposit in order to land some rewards. When making this deposit, restrictions on which payment methods you’re able to use often apply. For example, e-wallets such as PayPal, Neteller, and Skrill are often excluded. Debit cards like Visa and Mastercard are your best bet to avoid payment restrictions, but just be sure to check the T&Cs before you lay down your cash.

Game Restrictions

When you bag a free spins sign up offer to play slot games at a new site, there’ll almost always be a list of eligible games you can play using the bonus. In this instance, this unfortunately means you can’t use the free spins on any game at the site. Usually, casinos will pick one or two of their most popular titles to include in the bonus, but it’s worth looking at different deals and comparing the eligible games so you can go for something that floats your boat.

Time Limits

Virtually all slots offers come with time limits — a period of time within which you must have used your bonus and fulfilled any associated wagering requirements. If you haven’t used all of your free spins, or you have wagering requirements outstanding at the end of the time period, any winnings made so far will usually be forfeited. Therefore, it’s important to be aware of how long you have to use a bonus before you opt in. We suggest finding an offer that allows you to play at your own pace; time limits for smaller offers may be around seven days, while those with high wagering requirements will often allow 30 days to settle up.

Withdrawal Limits

Casinos have limits on how much a player can withdraw per transaction. This limit depends on the payment method the player is using, and is usually a large amount in thousands. However, as per UK Gambling Commission guidelines, casinos aren’t allowed to limit the amount players can withdraw in one day, for example. 

What you are likely to come across is the ‘closed loop system’. This is where customers have to withdraw to the same payment method they deposited with. So, if you deposited £50 using a Visa debit card, you’d need to withdraw £50 to the same card before withdrawing to another card or digital wallet — this is to protect customers from fraud. In terms of slots bonuses, it’s worth checking out the T&Cs around withdrawals before you get started, so you know what to expect if you happen to win a large amount.

Maximum Win Caps

In reality, many free spins bonuses and other slots deals have caps on how much you can win. This may seem unfair, but you’re essentially playing with the casino’s money, so it’s in its interest to limit the amount you can win when you’re playing for free. The maximum win cap may apply to the whole bonus, per free spin, or somewhere in between — for example, there may be a £8 max win per 10 free spins.

Game Weighting

When you’re playing through your bonus funds or free spins winnings, the bets you place on some games won’t count in full towards wagering requirements. A game with a 90% contribution rate, for example, contributes £9 for every £10 you wager. Classic table games like blackjack usually offer the lowest percentage, sometimes contributing just 5–10% — if anything at all. Slot games offer the highest rates, with most titles contributing 95–100%. If game weightings apply to bonuses, the relevant information will be provided in the terms, so you can easily see which games will help you complete playthrough requirements the quickest.

Casino Promotions for Slots Players

The best slots sites not only offer lucrative welcome packages but also provide great bonuses and recurring promotions for returning players. At Paddy Power, for example, you’ll get 25 free spins each week when you wager £50 or more on slots. 

Competitions and leaderboards are also popular among players. Simply by playing your favourite slot games you can earn points to advance up the leaderboards and win cash prizes.

Slots Tournaments

Tournaments are an exciting way to spice up your slots experience. Many online casinos host them, including more established and newer operators, so it’s always worth keeping an eye out for them in a site’s list of promotions. By joining a slots tournament, you can win cash prizes as well as other casino-related giveaways such as free spins.

Competing in a slots tournament is simple enough. The casino will choose one or more titles — it could be one of its new slot releases or games by a specific developer — and players will earn points as they play the game. The larger your wins are on the slot reels, the more points you’ll receive, which in turn will move you higher up the leaderboard against other players. 

Slots sites will dish out prizes for the players who finish top of the leaderboard after a given amount of time — you could receive anywhere between £100 and £10,000 for first place, while there may also be prizes for those in the top five or ten. Some bigger tournaments will even pay out to the top 100 players!

Don’t forget, slots are purely games of chance, so there’s no strategy you can use to move up the leaderboard. Rather, tournaments are a good bit of fun that puts players in with a shout of extra prizes.

Drops & Wins

Pragmatic Play provides the popular Drops & Wins promotion. This comprises weekly slots tournaments on top games like Gates of Olympus and Big Bass Bonanza, as well as random prize drops on slots and live casino titles. There’s a prize pool amounting to over £860,800 available each month, with the current version of the promotion running until February 2023. Like progressive jackpot slots, Pragmatic Play’s Drops & Wins tournaments are globally networked, so you’ll be able to take part at different casinos, including at Mr Green, Grosvenor Casino, and LuckLand.

VIP Programmes and Loyalty Schemes

Similar to those that you find with popular highstreet brands, loyalty schemes are also available when you sign up to some of the best slot sites. And they work in a similar way too, with the majority based on a system where points are acquired, and incremental totals equalling increasingly valuable prizes. These prizes can include things such as free bets, free spins, and for the bigger value points totals, the possibility of merchandise or even holidays. 

VIP programmes are also available to repeat customers, with the top slot sites in the UK wanting to ensure their existing customers don’t have any thoughts about looking elsewhere for a new slot casino. Many VIP programmes also include special privileges such as sneak peaks at upcoming games, higher wagering limits, and faster withdrawal options. The best slot sites around want their regular customers to feel appreciated, and VIP programmes are one way to do that. Once you’ve signed up at a site, it’s worth checking if they offer a loyalty scheme — you may have to opt in to receive the benefits.

Casino Loyalty and VIP Promotions

At Casushi online casino, you’ll earn points for playing real money slots and get a chance to play the Sushi Train game every time your loyalty bar fills up. You’ll win points for each line of matching sushi symbols and can exchange those points for free spins on slots like Book of Dead and Fluffy Favourites. Meanwhile, 10bet offers an example of a scheme at the other end of the scale. Its exclusive Ten Club offers brilliant perks like personal account managers, exclusive tournaments, and in-person hospitality events for the site’s top 1,000 players.

Player vs Player 

Another fun promotion that’s available with certain slot sites is player vs player. Each time you play, you’re pitted against a real opponent, and if you succeed in winning, you gain points towards your account which can be exchanged for prizes such as free spins or even real cash. It’s an exciting addition to any slot casino, and can add a certain competitive edge to your gameplay.

Casinos with PvP Promos

One example of a site with PvP features is Voodoo Dreams, where taking part in battles rewards players with Spirit Points and Experience Points that can be used to unlock higher Voodoo levels and bigger rewards. Duelz is another site, where you’ll deal damage to your opponent every time you hit a winning payline in live head-to-head tournaments. The tournaments run every 15 minutes, are free to enter, and offer cash prizes of almost £20,000 each week.

How to Play Online Slots

Online slots are a modern variation of the classic fruit machines found in land-based casinos, pubs and social clubs. Slot games come in a variety of formats and themes but fundamentally involve matching symbols to win prizes. 

Real money slots and free to play games are played in the same way — check out the basic steps below to get started:

1. Load up the game and check the paytable. The paytable presents the payouts for each of the game’s symbols and also lists information about the game’s bonus features and multipliers;
2. Select the size of your stake. In most slots, players select a number of coins to wager — these coins represent real money unless it’s a free to play game. Slot games typically come with a minimum and maximum bet;
3. Select the number of paylines you want to play with. If you match identical symbols along a payline, you win a prize. Playing with more paylines gives you more chances to win but also increases your total bet;
4. Hit the spin button to get the reels in motion. Many slots offer autospin and turbo spin features to speed up the process;
5. If you land three matching symbols left to right along a payline, you’ll receive a prize;
6. Look out for Wild symbols, as these can substitute for other symbols to help form winning combinations.

Online Slots RTP

There are several ways of measuring slot payouts — the one that is most commonly used is the Return to Player (RTP) percentage. The RTP of a game states how much of the money wagered on a slot during its lifetime is returned to players. For example, a slot game with an RTP rate of 96% would, on average, return £96 to players for every £100 wagered.

A high RTP is not a guarantee of any expected payouts, however. It is in fact a theoretical average calculated over millions of spins. As such, your payout from the slot may not match up to the numbers advertised. A simplified way to look at it is that if one player wins a big jackpot on a particular game, this would in theory leave fewer returns available for everyone else, skewing the RTP in the process.

Here are some examples of the highest RTP slot titles:

Game Variance / Volatility 

Another factor that affects payout frequency is game variance, also known as slot volatility. A low volatility game produces smaller, more frequent wins, while higher volatility games generally come with larger, less frequent wins. When you’re choosing a game based on its volatility, think about your budget — if it’s smaller, you might prefer lower variance so you’re more likely to hit a few wins before using up your bankroll. 

Other Slot Features and Mechanics 

There are many unique gameplay mechanics across the large libraries of our recommended slot sites, so it’s important to have a look around and see which features which you find the most enjoyable. With terms such as wilds and scatters, Cluster Pays, and avalanche reels to pick through, let’s take a closer look at some of these interestingly named features. 

Wilds and Scatters

Wilds and Scatters are two of the most classic symbols available when you play online slot sites. Wilds are the symbol you want to see — they substitute for any symbol, offering payout opportunities by helping to complete lines and form a winning combination. 

You can even get wilds that stretch to take up an entire reel, aptly named expanding wilds. Sticky wilds are another type that are locked in place wherever they are on the reel for a few spins, giving you a better chance of winning, while stacked wilds take up several spaces, giving you a better chance at a winning combination.

Scatters are a different symbol to wilds, but it’s equally great to see them on the reels as they unlock gameplay features such as bonus rounds and free spins. In addition to opening up new features, landing a scatter usually means a payout, no matter when it’s settled on the reel.

Mystery Symbols 

Bringing an air of the unexpected to slots gameplay, mystery symbols don’t have a predetermined value when they first show up on the reels. When the spin is complete, these mystery symbols — often denoted by a question mark — magically change to match a paying symbol. This sometimes includes bonus symbols like wilds. 

In some games, mystery symbols can stack on top of one another, creating even more potential for a big win. The appearance of mystery symbols doesn’t guarantee a profit from an online slot game, but it can offer different ways to land a payout. You can see mystery symbols in action in Microgaming slots like Wheel of Wishes: Wowpot, Fortunium Gold Mega Moolah, and Wicked Tales Dark Red. 

Free Spins Rounds

A feature that’s hugely popular in games at the best slot sites is the free spins round. It’s typically unlocked when you land the correct amount of scatter symbols on your reel — usually at least three. Once you enter the round, you’ll get a number of free spins of the reels, with any winnings added to your balance. Of course, there could be different ways to access free spin rounds depending on the game, but it’s always a feature to look out for that can really add some extra fun to your session. 

Avalanche Reels

Avalanche reels — also known as cascading reels, collapsing reels, or even exploding reels — are triggered every time players land a winning combination. In games with avalanche reels, symbols are removed when they form a winning payline, allowing new ones to drop down into their place and potentially triggering chains of wins. There’s an extra level of thrill in avalanche slots due to the chance of creating long strings of winning combinations from just one spin.

Expanding Reels

As the name suggests, this feature expands the regular layout of slot games, increasing the number of paylines and giving you a better chance to land a payout. Expanding reels can be triggered in different ways, such as hitting a winning combo in the base game, reaching the bonus round, or even by paying extra to unlock additional reels. BTG’s Star Clusters Megaways and Nolimit City’s Punk Rocker are among the top online slots to boast this ground-breaking new feature. 

Multipliers

You’ll definitely want to land a multiplier in games where it’s available, as it increases your winnings by a certain amount. Multipliers can show up in all sorts of ways — they’re commonly available in the free spins round as an extra perk. They’re often attached to wild symbols too, or you might find progressive multipliers that increase in value with each subsequent win.

Cluster Pays

Also known as grid slots, this feature removes the need to create a successful payline, instead triggering a payout when winning symbols land together adjacently — hence the name Cluster Pays. There’s not usually a specific formation that needs to be achieved, with wins triggered by a minimum number of symbols connecting to each other on the grid. This mechanic is often paired with avalanche reels, meaning the winning symbols disappear so others can take their place, potentially leading to another winning cluster without having to spin again.

Pick Games

Often found as part of the bonus round, pick games are where you’re presented with several choices. Hidden behind each one is a prize — you’ll have to pick one. Choose correctly and the prize is yours. The Rainbow Riches series of games is a great example, where nearly all the bonus rounds are a form of pick game.

Reels and Rows

Fundamental aspects of any slot games, reels and rows are where the various symbols appear during the game. Reels are the vertical columns that spin during each round, while a row refers to the horizontal line of symbols. The number of reels and rows varies between games, but the most common is a 5×3 set up — five reels and three rows of symbols.

Paylines

To land a win on a typical slot game, you need to match symbols left to right starting from the first reel. Some slots use a ‘win both ways’ mechanic which allows winning combinations to start from the rightmost reel, while others use different systems altogether. Either way, the positions the matching symbols must fall in order to land a winning combination is known as the payline. Rather than going straight across one row, they generally jump around to form a pattern across the reels.

The different paylines in a slot can be viewed in the game information — players often have a choice of how many paylines to play on each spin. The cost of your spin will increase per active payline, but by having them all in play you’ll give yourself the best chance of a win.

How We Find the Best Slot Bonus Sites

When it comes to finding the best online slot sites in the UK, it’s all about who you know at leading online casinos. Finding the best slot bonuses and welcome offers via GamblingDeals.com ensures that you are clicking through to the best slot sites, with the best new and existing slot bonuses online. But how do you know you are getting access to the best sites?

We have a team of people here at GamblingDeals.com that spend every day searching through the online casino space for the best slot sites, as well as the best Slingo sites. Once we come across a casino site that we like the look of, we carry out proper due diligence to ensure that they meet the high standards that we set. This includes ensuring that players are playing responsibly, return to player rates are fair, and that game weighting and withdrawal restrictions are properly applied.

The slots sites that make our top UK list are those who share a mix of the common attributes outlined above. And importantly, we only work with UK slot sites and online casinos that are licensed by internationally renowned governing bodies, like the UK Gambling Commission.

Check out of extensive list of the best slot sites online. Each of these slot sites offers the best slot games, excellent customer support, a wide range of payment methods, and tonnes of amazing welcome offers. Let’s get started.

1. Barz – 100% up to £300 + 50 Bonus Spins

Barz not only offers a hefty welcome bonus to new players, but also delivers when it comes to promotions for existing customers. There are chances to enter cash giveaways, collect loyalty points, and even win luxury holidays. The ‘Play a Random Game’ feature also offers a great way to get started at the site.

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18+. New Players Only. Min. deposit £20. Max. bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Winnings from Bonus spins credited as bonus funds and capped at £20. Bonus funds expire in 30 days, unused bonus funds will be removed. Welcome Offer is 100% match up to £300 plus 50 bonus spins on your 1st deposit. Bonus funds are separate to Cash funds, and are subject to 40x wagering the total bonus & cash. Only bonus funds count towards wagering contribution. Affordability checks apply. Terms apply. Please gamble responsibly. BeGambleAware.org.

2. Voodoo Dreams – 100% Bonus up to £50 + 50 Free Spins

An innovative online casino packed full of exciting slots, Voodoo Dreams dishes out Experience Points and Spirit Points on every winning spin. These points are used to unlock spells, which you can cast to claim rewards. There’s also the chance to go head to head with other players in duels. You’ll inflict damage on your opponent each time you land a winning spin on the slot reels.

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3. Buzz Bingo – £40 Bingo Bonus + 200 Bonus Spins

There’s plenty of crossover between fans of slots and the more traditional game of bingo. Buzz Bingo is the perfect place to play if you’re a fan of both these games. Bingo tickets start from just 1p in the Penny Bingo room, while there’s also a great selection of Slingo games if you’re looking for a bingo and slots hybrid. If Buzz Bingo sounds up your street, click through to sign up and play.

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4. Megaways Casino – Play £10, Get 30 Free Spins

If you’re looking for the best slot bonus UK, Megaways Casino has the answer. Just a £10 deposit is required to unlock 30 free spins for new customers. While many slots offers limit spin values to 10p, here they’ll be worth double that. Best of all, there are no wagering requirements attached, so anything you win is yours to keep.

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5. Grosvenor Casinos – Deposit £20 Play With £50

Known for its land-based casinos, Grosvenor is also a major player in the online slots space. Not only is the site packed with classics like Bigger Bass Bonanza and Rainbow Riches, but Grosvenor also offers a range of exclusive and original slots, such as Buffalo Wild and Stunt Stars, which has a minimum stake of just 3p. If this sounds up your street, click through to sign up and claim the welcome offer.

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6. LuckLand – 100% up to £50 + 50 Spins

Every £10 wagered on qualifying games at LuckLand gives you one entry ticket to a £5,000 prize pool. Winners can also pick up a £30 free bet, in addition to the bonus credit and spins available in the welcome offer. It’s clear that LuckLand offers plenty of chances to get lucky.

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Terms and conditions apply. Gamble Responsibly. Ad disclosure. New players only. 18+. Min deposit £20. 40x wagering applies to match up bonus. Offer valid for 1 week. 50 Spins on Starburst - 40x wagering applies to Spins.

7. Slots52 – Up to £6,000 Welcome Bonus

Slots52 offers a unique welcome bonus with a chance to win a whopping £6,000. With your first three deposits, you’ll be given the chance to spin the multiplier wheel. Bonuses up to 10x your deposit are up for grabs each time. Top software developers like Blueprint and Pragmatic Play are also featured here, so you’ll have the pick of the best slots on the market.

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8. All British Casino – 100% Up To £100 + 10% Cashback

All British Casino is one of the best slot sites around. Known for delivering an awesome gaming experience and initial deposit bonus, All British Casino has welcomed tons of new players over the past few years. Not only are there plenty of online slots, but you can play online casino games, online Slingo, and get more out of your deposits with the ongoing casino cashback bonuses.

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9. 32Red – 150% up to £150

32Red’s lucrative 150% deposit match welcome offer is certainly worth checking out, but once that’s dried up there are plenty of opportunities to pick up further bonuses. There are £500k monthly prizes available in Drops and Wins, along with double loyalty points available on selected slots each week with Ruby Tuesday.

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New accounts only. Min. £10 deposit, debit card and PayPal only. 50x wagering, game contributions vary, max. stake applies. 7 day expiry. See full terms.

10. Casushi – 100% Bonus up to £50 + 50 Bonus Spins on Book of Dead

Just a £10 deposit is required to unlock these new customer rewards at one of the quirkiest online casinos on the market. Casushi’s design is as fresh as they come, ensuring a pleasurable experience browsing its wide range of slots and table games. Head to the Jackpots tab to see the latest top prizes available in the hottest progressive jackpot slots.

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New Slot Sites

Every casino is different, but there are a handful of characteristics you’ll likely notice when checking out newer sites. Below, we’ve rounded up a few of the most common features of new slots sites.

• Latest Games – New slots sites are likely to be well up to date with all the latest game releases. If a games library has only recently been put together, chances are it’ll feature some of the hottest slots on the market right now.
• Tried and Tested Technology – Many newer sites use white labelling, which is where a company that operates several casinos uses an identical backend platform for each one. This means that the only real difference between the different sites will be the branding. While it can seem strange coming across multiple casinos that look eerily alike, it does mean you can count on most new sites to use tried and tested technology.
• Competitive Bonuses – The best slots sites offer competitive bonuses for new and existing customers, and you’ll find that new casinos often do this to stand out from the crowd. While PlayOJO has been around for some time now, it certainly broke the mould by purely offering no wagering bonuses to its players.
• Innovation – New slot sites often lead the way in terms of innovation too. Duelz Casino is one such example, as its player-to-player games and competitions have shaken up the whole online casino experience.
• Mobile Apps – A downside to newer sites is that they may take some time to produce a native downloadable app. If an app is a dealbreaker for you, you may wish to look to the more established sites that already offer this capability.

Looking for new UK slots sites? Try these out for size:

Online Slots Variations

There are many different formats and game mechanics involved in slots, each offering something different. However, we can initially group slot games into a handful of broad categories:

Classic Slots

Classic slots are akin to fruit machines found in brick-and-mortar locations such as casinos and pubs. They’re great if you’d prefer to keep things simple, as they typically offer 3 reels and fewer rows and paylines than more modern formats.

When playing classic slots we can expect to see plenty of retro symbols spinning across the reels — think fruits such as lemons and cherries, along with bells and lucky 7s. Classic slots focus on the base game rather than flashy bonus features, so they’re ideal for new players getting to grips with the format.

• Double Diamond is about as retro as they come. This simple 3-reel classic slot from IGT first landed at brick-and-mortar casinos before arriving online in 2005. The slot features 95.44% RTP and offers 27 ways to win. Lucky players who match three Double Diamond logos on the game’s single payline win 1000x their bet. 

Video Slots

Video slots is a very broad term but generally, it refers to modern slot games that incorporate a range of multimedia features. Most video slots are deployed in a 5×3 reel format but can have any number of reels, rows and paylines depending on the game.

These newer games deliver an immersive theme that enhances the all-around gaming experience. Whether it’s vampires in Microgaming’s Immortal Romance or Ancient Egyptian explorers in Play’n GO’s Book of Dead, video slots utilise graphics and soundtracks to draw the player in.

With video slots, you can also expect to see a range of bonus features such as wilds, scatters, multipliers, free spins and mini-games. 

• Released in 2021, NetEnt’s Starburst XXXtreme is the much longed-for follow up to the iconic original. The Starburst XXXtreme slot features the dazzling gems and Starburst Wilds that players know and love but adds a fresh new twist with XXXtreme spins and epic win potential. Starburst XXXtreme is a high volatility slot with 96.26% RTP.

Progressive Jackpot Slots

For the most part, progressive jackpot games work the same way as regular slot games — but there’s a twist. Every time a player places a wager on a progressive jackpot game, a percentage of the stake is added to a separate prize pool. This means that every player around the world spinning one of these slots is contributing to the mega jackpot. The jackpot keeps growing until one lucky player wins it, at which point the jackpot starts over from the minimum amount, also known as the jackpot seed.

Popular progressive jackpot slots that have previously paid out prizes in the millions include Microgaming’s Mega Moolah, NetEnt’s Mega Fortune, and IGT’s Cleopatra.

• In April 2021, Absolootly Mad: Mega Moolah, a popular variant of the original slot, had only been live for 12 months when it paid out over €19m to an online casino player. Featuring a 93.57% RTP, this high-volatility progressive jackpot slot comes loaded with features like rolling reels and a thrilling bonus wheel. Find it at top slot sites UK-wide.

Megaways Slots

Megaways slots do away with the traditional payline format most slot games use in favour of a more fluid mechanic. To land a win, players simply need matching symbols to appear on adjacent reels, rather than on a particular line. What’s more, the number of symbols per reel fluctuates between two and seven throughout the game — this all means that most Megaways slots offer a whopping 117,649 different ways to win.

Many developers of classic slot games have partnered up with Big Time Gaming, who developed the Megaways mechanic, to bring players revamped versions of popular games — these include Rainbow Riches Megaways and Big Bass Bonanza Megaways.

• Northern Lights Gaming upped the stakes with the 2022 release of Rocky’s Gold Ultraways. Alongside Rocky’s free spins mine and explosive bonuses, this high volatility slot features an incredible 60 million ways to win. Rocky’s Gold Ultraways offers an RTP of 96.12% and a max payout of over 11,500x your bet. 

Branded Slots

While it’s always fun taking a deep dive into a developer’s imagination with seemingly random themes, branded slots also offer lots of fun by harking back to some of the world’s most popular films, TV shows and music artists. Virtually every UK slots site offers a few branded games, so there are always plenty to choose from.

If you’re into TV and films, for example, Red Tiger Gaming’s Narcos Mexico slot with 243 ways of creating winning combinations, and Microgaming’s Jurassic Park Gold which features multiplier wilds, a selection of free spin modes and, of course, dinosaurs, are well worth checking out at top slots sites UK. 

• Play’n GO’s Kiss Reels of Rock slot game is a popular musical variant — you’ll join the band on a world tour to Detroit, Johannesburg, Tokyo, to name just a few locations. The reels are set upon a fiery stage in front of a packed crowd, with the band members themselves also featuring. Kiss Reels of Rock is a max volatility slot with 96.20% RTP.

Fast Payout Slot Sites

Whether you’re a high roller or a player who sticks to modest bets, fast withdrawals from your casino are a reasonable demand. The best slot sites UK-wide excel when it comes to offering fast payouts, though some banking options make for better withdrawal options than others. Below, we’ve rounded up some of the slot sites banking methods to consider if you want to get your hands on your winnings fast. 

• e-Wallets – Players often turn to PayPal casinos and other e-wallets to ensure fast withdrawals. Some casinos and slots sites offer instant payouts to e-wallets. Others add a few days for internal approval and processing. 
• Trustly – Trustly uses Open Banking technology to connect directly to your bank and process transactions. Fast payouts are possible, but the process may take up to three days at some casinos. Trustly Express uses fingerprint or face ID to speed up mobile transactions for returning players. 
• Visa Fast Funds – Standard debit card withdrawals can stretch to six or seven days. Some slots sites support the Visa Fast Funds service, which reduces the wait for Visa debit card withdrawals to as little as 30 minutes. 
• AstroPay – AstroPay offers a virtual prepaid card, a prepaid Visa debit card, and a digital wallet. Not all online slots sites include AstroPay in the cashier section but, where available, payouts can be instant or take up to three days.
• Cryptocurrencies – Crypto casinos and slots sites should be approached with caution, but there’s little denying the lightning-fast nature of these currencies. When requesting payouts, players will often only need to account for the site’s processing times.

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Top 10 Slot Games at UK Slot Sites

Ever since online gambling started taking off in the mid-90s, online slot machines have dominated the arena. These games, it seems, have a lasting endurance that extends beyond the sensation of pulling a lever or pushing a button and watching the reels turn. Today, the best UK online casinos are packed full of the latest slot titles, an iGaming genre in which the industry’s top developers concentrate most of their creative efforts.

While these slots have evolved over the years — bringing new innovations such as progressive jackpots and multiple bonus features — the fundamentals remain the same: spin those reels and hope your luck is in.

We’ve had a long hard think about some of our favourite online slots over the years and have narrowed them down to this recommended list of ten. This is by no means an exhaustive list, but together they represent a decent mix of the world’s top slots, with lots of variation in return to player (RTP) rates, variance, paylines, bonus features, and jackpot wins.

Gonzo’s Quest

Based on the travels of a young Spanish conquistador who went in search of the lost city of El Dorado, Gonzalo Pizarro, Gonzo’s Quest has been one of the most popular online slots of recent years. Released in 2013 by NetEnt, Gonzo’s Quest is a 5×3 reel slot with 20 paylines and an RTP of 95.97%. To stand a chance of striking gold with Gonzo, players will need to match three Inca symbols on the grid from left to right; each time this happens, the winning symbols are replaced in an avalanche, building up consecutive multipliers to a maximum of 5x. Pay attention to the gold coin, which is known as the free fall symbol in this slot, and any reel containing three of these will activate ten avalanches. NetEnt is known for its attention to detail, and we love how animated Gonzo is, even in the quieter moments of this game — you’ll find him scratching his beard, removing his helmet, and even moonwalking during your hunt for treasure.

Starburst

Another blockbuster release of recent years, NetEnt’s Starburst takes place in an otherworldly backdrop where it seems there’s nothing in the universe but dazzling jewels, bars, and lucky sevens. Starburst is a 5×3, 96% RTP slot with a famed win-both-ways feature, meaning players can build winning combos in both directions. Starburst combines classic online slots with the crazed formula of games like Bejeweled, rewarding players with frequent but small wins. To be in with a shot at winning the max jackpot of 250x the stake, players will need to land the wild symbol on one of the three middle reels; if they do, the wild will expand and the reels will be re-spun up to a maximum limit of five times.

Rich Wilde and the Book of Dead

Play’n GO’s Book of Dead is regularly included in welcome bonus offers by some of the best online casinos in the UK. It’s easy to see why: released in 2014, this 5×3 reel slot includes a free spin feature, expanding wilds, first-class sound and graphic animations true to

the Egyptian theme, and a decent RTP rate of 96.2%. Book of Dead takes place in the Tomb of the Pharaohs alongside Rich Wilde, an Indiana Jones-esque figure who continues his quest for ancient treasures. Payouts begin when three or more symbols form in a winning combination, but the real money is in the book of dead symbol — this serves as the game’s scatter icon, and hitting three or more across the reels will reward players with ten free spins.

Mega Moolah

Perhaps the biggest progressive jackpot slot in history, Microgaming’s Mega Moolah takes place on safari with a 5×3 reel grid and an RTP of 88.1%. If you take a look at the highest single payouts in UK online casino history, Mega Moolah is responsible for most of these – in 2015, John Heywood won over £13m from a 25p stake, and this remains the British record.

There’s no hidden secret to landing a huge prize though, with jackpot wins coming entirely at random, in some cases taking months on end to drop. However, higher stakes have an increased chance of releasing one of the game’s four jackpots. Mega Moolah can also be played as a standard video slot with an RTP of 95%.

Mega Joker

Mega Joker takes the classic slot iconography and enhances it for a modern online gambling experience. All the familiar symbols are in play on this 5×4 grid, including sevens, cherries, melons, lemons and more. Added to the excitement of this Novomatic slot are the jester wilds and the star scatters – finding any of these scatters is good news, but finding five of them in one spin of the reels will reward players with a payout of 40,000x their stake. Released in 2013, and with an RTP rate of 95%, stakes on this slot can start as low as 4p, making it suitable for punters on tight budgets.

Goblin’s Cave

If you’re looking for an online slot stripped back to its simplistic best, then look no further than Playtech’s legendary Goblin’s Cave. This 3×3 reel takes place inside the titular character’s lair, and players can place wagers from as little as 0.01 coins. The wild symbol is represented by the red gem, while the scatter is the lantern – three of these appearing on one payline will trigger the bonus round, which invites players to simply select which treasure chest they’d like to claim. Once they’ve done so, the contents of the chosen chest will be revealed, taking the form of either free spins or cash prizes. With an RTP of 96%, Goblin’s Cave is one of the industry’s most enduring products, released all the way back in 2007.

Jackpot 6000

Another product of the prolific NetEnt studio, Jackpot 6000 has one of the highest RTP figures of any online slot in the world at a staggering 98.9%. Although the game was released in 2014, this has the look and feel of an old-school game, taking place on a traditional 3×3 reel mechanical slot inside a casino which is sure to please any purists. Just as you would on a mechanical slot, players win prizes by building combinations from left to right. But when you strike lucky on Jackpot 6000, you’ll be confronted with the Supermeter – a feature that invites players to wager their winnings again or collect the money and return to the base game.

Cleopatra

Head into the sultry world of ancient Egypt with IGT’s Cleopatra – a 5×3 online slot released in 2012 with an RTP of 95.7%. There’s no surprise that the goddess herself serves as the game’s wild, with the Sphinx suitably adopting the role of the scatter icon. It’s these scatters that trigger the bonus round: if players land three or more of these they’ll receive 15 free spins, and any winnings generated from these bonus spins will be multiplied by three at the end of the round. With an authentic soundtrack, a dazzling interface filled with colour, and a potential jackpot of 10,000x the stake, Cleopatra has been a prominent fixture at top UK slot sites for almost a decade.

Lucky Leprechaun

If you like Guinness, violins, Irish jigs, and pots of gold, you’ll be sure to love Lucky Leprechaun – a 2015 slot by Microgaming with an RTP rate of 96.3%. The Irish theme is really laid on thick here, but we find that this makes for a light-hearted title with plenty to enjoy. For starters, the soundtrack is great, the animations are sharp, and the game is packed full of bonus features. The best of these bonus rounds is the Trail of Fortune, which is triggered when three or more pots of gold appear on the reels. At this point, you’ll be shown a winding road, at the end of which is a pot brimming with gold pieces. Simply spin the dial at the bottom according to how many pots of gold triggered the bonus game, and work your way up to the jackpot. In addition to this, there’s also a free spins bonus launched when the lucky clover lands on the last reel.

Book of 99

Released in 2021, Relax Gaming’s Book of 99 is the newest online slot in our list of recommendations and comes with an incredible 99% RTP rate. There’s a cinematic quality to this online slot, with players given an animated introduction before being taken to the 5×3 grid, framed within an ancient Greek temple. There are two ways to launch bonus features in this game: the first is to land three of the book symbols on the reel, which will trigger a free spin round where one symbol is selected as the expanding wild; the second is to collect a total of 99 books across multiple spins, which will reward players with ten free spins.

2023’s Latest Slots

The top software developers continue to produce exciting slot games of the highest quality. Check out some of the best new releases below.

• Sakura Fortune 2 – Quickspin’s sequel to the original Sakura Fortune game offers the same attractive Japanese theme, along with a unique 3-4-4-4-3 reel set-up. There are 576 win ways in this game along with some bonus Wild Respins.
• Magician’s Secrets – This magic-themed game from Pragmatic Play offers 4,096 paylines across six reels and 96.51% RTP. As for bonuses, there are free spins, multipliers, and sticky wilds available to boost your payouts.
• Gigantoonz – Play’n GO’s Gigantoonz is deployed across eight reels and uses the innovative Cluster Pays mechanic. The fun of the cartoon theme is complemented by the 4,000x max payout and 96.25% RTP.
• Queen of Gods – Pragmatic Play adds to the dearth of ancient Egyptian slots with this title. Players can enjoy 10 paylines across a 5×3 reel set plus a free spins round with multipliers, although the max win is a little low at 1,839x your stake. We’ve also seen higher RTPs — Queen of Gods clocks in at 95.26%.
• Dragons Clusterbuster – A high-variance slot from Red Tiger, Dragons Clusterbuster utilises the Cluster Pays mechanic where players need to land at least five symbols adjacently on the 9×9 reels. There are also avalanche reels and several other bonus features, and the RTP sits at 96% with a max win of 5250x your stake.
• Divine Riches Helios – Just For The Win serves up some mythological action in this medium volatility slot with an RTP of 94.04%. There are four fixed jackpots up for grabs here which can be won during a pick game, along with scatters and wilds.
• Wild 1 – Yggdrasil’s latest slot game was released at the start of July and places players in a post-apocalyptic setting. It offers a multi-level reel with four variations of wilds, as well as 4,096 paylines and an RTP of 96%.
• Runner Runner PopWins – Following Stakelogic’s Runner series of slots, this latest version brings with it five reels and an RTP of 96.5%. It’s a classic slot featuring the usual symbols such as lemons, oranges, seven, crowns, and stars, and gives a max win of 10,000x.
• Vegas Dice Megaways – This Vegas style slot is exciting to play, combining many extra features such as cascading symbols and multipliers across six reels. It offers a maximum win of 40,000x and an RTP of 96%.
• Captain’s Quest Treasure Island – Betsoft’s new pirate-themed video slot boasts features like nudging wilds, free spins, and win multipliers. Can you steer the ship to a max win of more than 25,000x your stake? 
• Crown of Fire – The retro-style Crown of Fire from Pragmatic Play blends classic symbols like fruits and Lucky 7s with expanding wilds and scatter symbols. This simple slot offers a max payout of 1,000x your bet.
• Max Megaways – Set on a desert island, Big Time Gaming’s Max Megaways offers players a Bond-style adventure with special wilds, unique bonus rounds, and a 6-reel grid with 117,649 ways to win. 

How to Claim a Slot Bonus Online 

Using the tools here at Gambling Deals, claiming a great new slots bonus is a simple process. Follow the steps below to get started.

1. Begin by browsing our lists of the best slots bonuses here at Gambling Deals. You can sort by popularity, rating, number of spins, bonus amount, and whether it’s a new casino site. 
2. Once you land on a bonus that piques your interest, hover over ‘T&Cs Apply’ to familiarise yourself with the main terms.
3. If you’re happy to proceed, click the ‘Claim Bonus’ button to be redirected to the casino site.
4. Once you’ve landed on the site, click the ‘Register’ button to create an account.
5. The casino will prompt you to enter some basic details including your name, address, and date of birth. After that, you can choose a username and password for your account. Don’t forget to enter the bonus promo code if it’s required.
6. Now you’ve signed up with the casino site, check how much you need to deposit to unlock the slots bonus. Then, head to the cashier page to add funds using a payment method eligible for this particular promotion.
7. Some sites dish out your bonus rewards automatically, while others will require you to opt in from the account section.
8. Once your free spins and bonus credit have landed in your account, you can hop over to the reels and enjoy!

Mobile Slot Sites

When it comes to playing the best online slot sites, it’s vital that you can play on mobile. These days, if slot sites don’t offer you the chance to play via your mobile device, then they are not worth your time. The question instead is whether they provide you a mobile site or a dedicated mobile app. The best slot sites often allow their players the chance to download their mobile apps to play slot games on the go.

When you are looking to join your next online slot site, why not check out whether they offer a dedicated mobile app. If so, click through and get yourself signed up for an account before you download the mobile app. That way, when you click on to your iPhone or Android device to play, your mobile account will be ready and waiting for you. One of our favourite things about the best slot sites is that they always make it easy for players to play online slots while out and about and on the go.

Best Slots Sites Apps

If you decide to download a mobile slots app to your mobile phone or tablet, it pays to ensure it’s a good pick. Here’s a quick roundup of some of the top UK slots sites with apps:

Are Slot Sites Safe to Use?

Of course. Here at GamblingDeals.com, we only work with slot sites that are licensed by an internationally recognised regulatory body. In the UK, that body is called the UK Gambling Commission (UKGC). However, other leading institutions that slot sites are regulated by include the Malta Gaming Authority (MGA) and the Gibraltar Gambling Control (GGC) and others. Whenever you click through to join UK slot sites, or sites based overseas, make sure that they are regulated. That will ensure that the online casino is operating in a trustworthy manner.

To ensure your safety, always click through to the best slot sites via GamblingDeals.com. That way, you will know that the slot site is adequately regulated and acting in above board.

Top Online Slots Software Developers

One of the main reasons online casinos are able to host hundreds or even thousands of slot games is because of the range of top software developers working to produce them. Each provider has its own strengths and special areas of interest, which is what makes the online slots market so varied and exciting. Let’s take a look at a handful of the industry’s top online slots developers below.

NetEnt

Swedish developer NetEnt is truly one of the giants of the casino industry. Since its founding in 1996, it’s placed itself at the heights of the slots market, in part thanks to the successes of 2011’s Gonzo’s Quest and 2012’s Starburst. The company has gone bigger and better in the decade since, however — producing a number of popular titles such as Silverback Gold, Dead or Alive, Shangri La and Blood Suckers.

NetEnt is also known for its music-themed games, such as the Guns N’ Roses and Jimi Hendrix slots, and isn’t afraid to revamp the classics, with Gonzo’s Quest Megaways and Starburst XXXtreme cooking up a storm in recent years. The developer’s crowning at the 2016 EGR Awards as winner of Innovation in Slot Provision, along with the company’s acquisition by live dealer experts Evolution Gaming in 2020, further affirms its status as iGaming royalty.

Other popular slots in the NetEnt portfolio include:

• Dead or Alive 2
• Twin $pin 
• Fruit Shop
• Divine Fortune
• Jumanji

Microgaming

Microgaming claims to have created the world’s first online casino software back in 1994 and it certainly hasn’t rested on its laurels since. The company boasts the largest progressive jackpot network in the world, which has paid out over £1.2 billion on games such as Mega Moolah.

The Isle of Man-based developer has also picked up multiple awards over the years, including iGaming Software Supplier of the Year at the 2018 International Gaming Awards and EGR’s Innovation in Slot Provision award back in 2011. In 2022, Microgaming sold its entire back catalogue of games to Games Global Limited, though this shouldn’t impact the availability of Microgaming slots at online casinos and slots sites.

Here are some of the top slots developed by Microgaming:

• Game of Thrones
• Thunderstruck
• Immortal Romance
• Break Da Bank Again
• Mermaids Millions

Playtech

Playtech was founded in 1999 and is one of the most versatile developers on the market. Indeed, many operators come to be known as ‘Playtech casinos’ as they feature games exclusively made by this developer.

Whether you’re looking for slots, blackjack, roulette, or live casino games, Playtech has you covered. Particular highlights include the Age of the Gods series, as well as the high RTP games Ugga Bugga (99.07%) and Goblin’s Cave (99.32%). As for Playtech’s live casino offering, it’s well worth checking out its augmented reality table games.

Here’s a selection of top titles from Playtech and its partner studios:

• Buffalo Blitz
• Legacy of the Wild
• Robocop
• Jackpot Giant
• Fluffy Favourites

Play’n GO

Play’n GO is known for being a market leader in mobile slots and won IGA’s Slot Provider of the Year award in 2017. Its most famous slots include Book of Dead from the Rich Wilde series, which takes players on a series of adventures to uncover ancient treasures and is frequently featured in free spins casino bonuses.

Other popular slots from this developer include Legacy of Dead, Reactoonz, Diamonds of the Realm, and Forge of Gems. And while this provider is less known for its table games, you can play blackjack games for free directly on the Play’n GO website.

Here are some other Play’n GO titles worth watching out for:

• Golden Osiris
• Piggy Bank Farm
• Sparky & Shortz
• Def Leppard Hysteria
• Fat Frankie’s

Yggdrasil

Founded in 2013, Yggdrasil is one of the younger developers around, but it’s still very much considered a market leader. Yggdrasil focuses on video slots; through its games such as Valley of the Gods 2, Football Glory, and Jackpot Express, you can explore a range of fantastic themes with this developer.

Bolstered by its Game Engagement Mechanics, the developer picked up wins at the International Gaming Awards five years on the bounce — an impressive feat.

Here’s a selection of popular slots from Yggdrasil and partners:

• Calavera Crush
• Cherry Pop Deluxe
• Hillbilly Vegas
• Prized Pets Gigablox
• Mega Cash Stacks

Novomatic

Austrian-based Novomatic is one of the industry’s largest software developers. Founded back in 1980 by billionaire Johann Graf, the company has locations in 50 countries and employs over 21,000 members of staff.

Novomatic offers just about anything you can think of related to the gambling industry — its services include land-based products, online and mobile gaming solutions, lottery and sports betting products, and cash management systems. As a result, you’ll find Novomatic games at just about every UK slots site.

Some of Novomatic’s most popular games include:

• Apollo God of the Sun
• Book of Ra
• Da Vinci Wins
• Lord of the Ocean
• Rio Carnival

IGT

International Game Technology (IGT) dates back to 1975 and was involved in a number of early industry developments, including frequent-player rewards programmes, and the first progressive jackpot slot, Megabucks — released all the way back in 1986.

Today, IGT is listed on the New York Stock Exchange and offers a range of products including land-based gaming and lottery terminals, online slots and table games, and sports betting technology. As you’d expect, its games regularly feature at all the best slot sites, so you’re never too far from an IGT title.

IGT’s most popular slot games include the likes of:

• Cleopatra
• Game of Gods
• Lobstermania
• Secrets of the Forest
• Triple Diamond

Pragmatic Play

Pragmatic Play is one of the newer software developers in the iGaming industry, having been founded in Malta in 2015. The provider is known for its mobile-first mindset and covers a wide range of games including slots, live dealer, bingo, virtual sports, sports betting, and more.

This developer was crowned iGaming Supplier of the Year at the Gaming Intelligence Awards Latin America 2021, while the individual brilliance of the Gates of Olympus slot was recognised with the Game of the Year award. Pragmatic Play’s slots are available to play in demo mode through its website in 33 different languages, so it’s easy to check out some of its titles before joining an online casino. 

Here are some of this developer’s top slots:

• John Hunter and Tomb of the Scarab Queen
• Sweet Bonanza
• The Dog House
• Gates of Olympus
• Fury of Odin Megaways

Nolimit City

Founded in 2014 in Sliema, Malta, Nolimit City’s team of professionals extends to Sweden and India, producing a wide range of innovative slot games. Developing new mechanics for slots is very much the company’s focus — in recent years these have included the xNudge feature, originating in Hot Nudge, and xWays, as seen in Pixies vs Pirates and Dragon Tribe.

In 2022, Nolimit City joined NetEnt, Red Tiger, and Big Time Gaming as it was acquired by Evolution, one of the industry’s largest software providers. This was on the back of winning a number of awards the previous year, such as Casino Grounds’ Game Provider of the Year 2021, and Gaming Intelligence’s Game of the Year for San Quentin xWays. 

Other popular slots in Nolimit City’s portfolio include:

• Dead Canary
• Pearl Harbor
• Rock Bottom
• Karen Maneater
• xWays Hoarder xSplit

The Best Payment Methods at UK Slots Bonus Sites

When it comes to finding the best payment methods at online casino operators, there are some great options for new players. When you are looking to deposit real money into slots sites or an online casino, the first thing you should do is check out the payment method section. UK players should get access to traditional payment methods like debit card, bank transfer, and pay by phone. Likewise, new customers should also be able to access popular e-wallets, like Neteller, Skrill, Boku, and PayPal.

If you are looking to pick up a match bonus, or want to guarantee your bonus funds, always check the T&Cs for expiry information. While some slots sites allow you to place a min deposit to access your bonus funds, others will require you to use a certain payment method to guarantee your bonus.

Debit Card

Depositing and withdrawing funds with a Visa or Mastercard debit card is a simple and easy process. Most people are used to using debit cards on a regular basis, so it’s just a case of entering your card details at the casino to get started. 

Debit cards are also your best bet for claiming free spins sign up offers. Indeed, you’ll often need to unlock these deals by making a deposit, and while e-wallets and other payment alternatives are often excluded, debit cards are always accepted. The main downside is that withdrawals are a bit slower — up to seven days — unless you’re using a service such as Visa Fast Funds.

Bank Transfer

Making a wire bank transfer at the casino is another secure payment option. To get started, head to the casino’s payments page and select the wire transfer option. You’ll then be given the casino’s bank details, which you can use to set up a new transfer from your online banking.

Bank transfers are pretty much the only methods that don’t complete deposits instantly, and withdrawals are fairly slow too, often taking up to seven days. However, it’s a very secure payment method as you don’t need to share your own bank details and the transfer itself will be protected by the bank.

Trustly

Trustly is a common banking option at top online slots sites UK. This online payment service bypasses traditional networks and lets you make instant deposits at slot sites and casinos directly from your bank account. You won’t even need to open a Trustly account. Instead, you’ll use your regular credentials to log into your bank securely and confirm the transaction. 

As with debit cards, you can make instant deposits through Trustly, and you’ll also tend to qualify for bonus offers like first deposit only matched deposit deals and free spins bundles. Trustly transactions are speedy across the board, though the recent launch of Trustly Express — which allows returning mobile slots players to deposit or withdraw using their fingerprint or Face ID — should hasten the pace even more. 

Prepaid Cards

The most well known prepaid card in the online casino sphere is Paysafecard — you can purchase these in shops and use them to deposit online by entering the 16-digit code on the front of the card. Another option is AstroPay, which offers virtual vouchers that you can buy in different denominations.

Prepaid cards can’t usually be used to withdraw funds, but they are handy for deposits. As the maximum amounts are pretty low, they’re a useful way to keep track of your spending.

AstroPay

In addition to prepaid virtual vouchers, AstroPay now offers a prepaid Visa debit card. Launched in June 2022, the Visa branding means this debit card is likely to prove eligible for most bonus offers at online slot sites and casinos. So, using the card should offer a straightforward route to depositing and subsequently getting your hands on any free spins winnings or profits from bonus cash. 

Alternatively, you could stick to AstroPay’s e-wallet. It offers many of the same benefits as PayPal and other e-wallets, though you’ll need to check the T&Cs to confirm its eligibility for slots bonuses. 

Pay by Mobile

Pay by mobile options such as Boku are another popular option for customers who would prefer not to share their card details with the casino. Instead, your deposits will be funded through your monthly phone bill.

All you need to set it up is your phone number — after entering it at the casino you’ll receive a code to confirm the transaction. From there, any Boku deposits will be charged alongside your phone bill each month. Again, this option can’t be used to withdraw funds.

e-Wallets

To use a digital e-wallet, customers will need to create an account and link it with their bank. When it comes to making payments at the casino, you’ll just need to log in with these details and choose the amount you’d like to deposit or withdraw — it’s as easy as that! Deposits are instant and withdrawals are typically completed in 1–2 days. The downside with e-wallets is they’re often not accepted for claiming slots offers.

• Neteller – Neteller is owned by the Paysafe Group, which also manages Paysafecard and Skrill. It’s been around since 1999 and is one of the most popular e-wallets for online slots players. Even though the casino won’t charge, there may be some fees involved for making payments to and from your Neteller account.
• Skrill – Also owned by Paysafe Group, Skrill is also known for fast deposits and withdrawals. Like Neteller, there may be some small fees involved when using your Skrill account.
• PayPal – PayPal is the most widely used digital wallet worldwide, and is a solid option for online casino payments. It tends to be available if Skrill and Neteller aren’t, and vice versa. It’s also free from fees.

Cryptocurrencies

If your priority is anonymous transactions and instant payments, cryptocurrencies such as Bitcoin and Ethereum could be worth considering. All cryptocurrencies are subject to volatile price changes, so it’s important to fully understand how they work before using them to gamble online. There aren’t tons of UK crypto casinos yet, but the Gambling Commission has licensed a few to date.

Responsible Gambling

Responsible gambling is a key consideration for the team here at Gambling Deals, and it’s crucial that every player is aware of steps they can take to manage their playing time and track their spending. 

Here are a few ways you can ensure you’re gambling responsibly:

• Only ever gamble through a licensed operator;
• Set a budget for your session and stick to it — never chase your losses;
• Never treat gambling as a form of income;
• Never gamble when you’re under the influence of drugs or alcohol, or when you’re feeling emotional;
• Seek help from the organisations available if you feel your gambling has become a problem;
• Set limits so you know when to stop, both in terms of money and time. On-site limiters can be handy for this and are available to players at all licensed sites;
• Never keep your gambling a secret from those closest to you. Feeling ashamed or guilty of gambling is a warning sign that you may have a problem.

Essentially, you should only ever bet what you can afford to lose — gambling should be viewed as a bit of fun rather than a way to make money. Due to the inherent house edge in every slot or casino game, players are virtually guaranteed to lose money in the long term.

Casinos that are licensed by the UK Gambling Commission (UKGC) offer a range of tools to help players gamble responsibly, so it’s worth checking these out as soon as you sign up with a UK slots site. Let’s take a look at some of the available options.

Deposit Limits

Setting a deposit limit is a great place to start if you’re concerned you might overspend. Players can set deposit limits per day, week, month, or any other amount of time, and once you reach the limit, you won’t be able to add any more funds into your casino account. Naturally, if there’s no money in your account to stake, this can work as an incentive to play free games instead, or take a break from the slots altogether. 

Timeouts

Players can also set up time periods where they won’t be able to make bets or play games on their casino accounts. Again, there’s often a range of options available to suit your needs — at Bet365, you can set timeouts lasting for 24 hours, 48 hours, 7 days, 30 days, or a personally customised amount of time. A Custom Time-Out can be set up on a one-off or recurring basis — for example, you could put a block on your account to last from Monday at 9:00am until Friday at 17:30pm.

Stake Limits

A sign of gambling addiction is a need to place continually larger bets to achieve the same thrill — playing games with low stake limits is therefore another useful way to control your spending. Every slots site will offer games with a range of stake limits, and you can find out what these are by loading the game information. Many slots can be played from just 10p or even 1p a spin in some cases, offering a great way to enjoy games responsibly.

Self Exclusion

Self exclusion is another helpful tool that can be enacted in a number of ways. UKGC casinos give players the option to set up a block on their account for a certain amount of time, in a similar way to how a timeout works. However, a self-exclusion is generally a longer term break from gambling — at Bet365, self exclusion periods include 6 months, 1 year, 2 years and 5 years. During the exclusion, you won’t be able to use your casino account for any betting or gaming activities, but you’ll still have access to the account in order to withdraw any remaining funds.

For players who have multiple casino accounts and feel they would benefit from a blanket exclusion from all gambling related activity, GAMSTOP’s free service is a good option. Once registered with GAMSTOP you won’t be able to access any UK slots sites, and again, you’ll be able to choose an appropriate length of time for the ban when you set it up.

Best Slot Sites UK Summary

Whatever you are looking for when it comes to finding the best slot sites, make sure that you only play with online casino sites that are leading the market. That means sense checking their credentials against the main points we have pulled out in this review. Always make sure that the slots sites you join are trustworthy and safe to use. After that, ensure you get access to the best online slot machines, slots bonuses, market-leading slot games, and the very best slot jackpots, and bonus terms available. If in doubt, check out our slot bonus tables now to find the best slot sites online. What are you waiting for?

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