Best Slot Sites UK – 2022

Slot Bonus Sites: The Definitive Guide

We have created the definitive guide to finding and joining the best slot bonus sites. Our guide gives you the lowdown on everything there is to know about bonuses, games, software and more. This means you can compare the best online slot sites with confidence. Here’s the lowdown of everything we’ll be looking at:

• What are slot sites?
• What do the best slot sites have in common?
• How do we find the best online slot sites?
• How do we compare the best slot sites?
• What are the best slot sites?
• How do slot sites work?
• What are the best slot games at online slot sites?

Let’s get started.

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.

What The Best Slot Bonus Sites Have in Common

Certain things stand out at all of the best slot sites in the UK. Whether it is the welcome bonus on offer or the quality of a mobile online casino site, there are a lot of factors to consider when analysing slot bonus sites.

To make your life easy, we have compiled a list of the key traits you should look out for at top UK slot sites. Let’s dive in and take a look.

• Leading slot bonuses for new and existing players – UK slots sites that provide new and existing players with the best value bonuses are well worth exploring further. We love to see slots sites that offer a range of promotions, including matched deposit bonuses, as well as free spins both for existing and new players
• Clear and concise Terms and Conditions – The best slot sites leave nothing to the imagination and show you exactly what you’re getting when you sign up to a bonus. What’s more, we’ve laid out the terms and conditions of each bonus advertised on our site so that you can easily access the most important information.
• The best online slot games – The best slot sites will offer games from the best software providers around. Playing games made by the likes of NetEnt, Microgaming and Playtech will ensure you always have the best slot possible slot experience.
• Chance to play for major jackpots – The best online slot sites offer games with a wide range of paylines, progressive jackpots, and top bonus rounds that run into the millions to keep players entertained. Just remember, however, that the higher returns on offer shouldn’t be an incentive to chase any losses.
• Excellent customer service – We don’t like to see things go wrong for anyone at an online slot site, but if they do, it’s comforting to know that the customer support is high-quality and readily available. The best slots sites will offer you several options, including live chat, email support, FAQ, and a 24-hour phone line.
• Mobile functionality – Playing games at online slot sites is only fun if you can do it whenever and wherever you want. The best sites provide mobile apps with games libraries that are as extensive as the desktop counterparts, meaning your gambling experience doesn’t drop however you choose to play.
• Wide range of deposit and withdrawal options – We expect to see traditional payment methods offered, like debit and credit card, alongside popular e-wallets like PayPal, Skrill, and Boku. Having the ability to opt-in to bonuses using a wide range of payment methods is the cherry on the top when it comes to enjoying the best slot sites.
• Security and licensing – It’s essential that slots sites are properly licensed by the UKGC. Here at GamblingDeals.com, we only show you casino sites that are fully licensed which means that you will always play at a site where the games are fair and your transactions are protected.

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 another 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.

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 terms.

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.

While wagering requirements limit your ability to withdraw winnings from bonuses, other terms come into effect during the gameplay. For example, maximum win caps limit the amount you can win using bonus credit or free spins, and maximum stakes are often used to curb the amount you can bet. What’s more, promotional free spins are usually set to the minimum bet on a particular game, meaning they’re mostly useful for getting some practice in.

Casino Promotions for Slots Players

The best slots sites not only offer lucrative welcome packages but also provide great bonuses for returning players. Many casinos such as Paddy Power host recurring promotions where players who wager at least £20 on slots can grab an additional £5 free bet every week.

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.

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.

The Best Slot Bonus Sites

Check out our list of the best slot sites in the UK below. Our top list of the best slot sites constantly changes and evolves, but loosely we base our top 10 slot site list on things like slot bonus, video slots, game availability, payout rates, and simply how much fun it is to play on the site. Check out our quick-start list of top 10 slot sites now.

Best Slot Sites:

Top 10 Best Slot Sites Online

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. 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.

100% Up To £100 + 10% Cashback

• 10% Cashback No Restrictions
• 100% Up To £100 1st Deposit

Claim Bonus

Welcome bonus for new players only. Maximum bonus is 100% up to £100. No max cash out. Wagering is 35x bonus. Maximum bet while playing with a bonus is £5. Max cashout £100 if never deposited, no mac once deposited. Bonus excluded for players that deposit with Skrill or Neteller. Full T&Cs apply.

2. Genting Casino – 100% Up To £50 Welcome Bonus

​We absolutely love Genting Casino, a brilliant online casino brand that offers an excellent user experience, a range of payment methods, and exemplary customer service. If you want to join one of the top online slot sites in the business, sign up at Genting Casino today.

100% Up To £50 Welcome Bonus

• Up To £400 Bonus
• Trusted Casino Site

Claim Bonus

New Customers. Deposits between £20-£100 (max 4) wagered 35x (% game weightings apply) within 30 days on qualifying slot games will unlock cash bonuses of an equal amount.15 days to accept/opt into each bonus. Full T&C’s Apply. You will find the necessary tracking links on you Income Access Affiliate Account.

3. My Play Casino – £200 Welcome Bonus + 100 Bonus Spins

​Mr Play Casino is a newcomer to our best slot sites list. It offers hundreds of leading slot games as well as a lucrative welcome bonus. If you’re looking for a new site that’s packed full of the best video slots, click through to join Mr Play Casino.

100 Bonus Spins + £200 Welcome Bonus

• £200 Welcome Bonus
• 100 Free Spins On Sign Up

Claim Bonus

New players only. 18+. Min deposit £10. Welcome package splits over 3 deposits. 35x wagering requirement applies to match up bonus. Offer valid for 1 week. 100 spins split to 20 spins a day for 5 days. 50x wagering applies to spins. Full T&Cs apply.

4. Buzz Slots – Spend £10 and Get £60 Bonuses

Another newcomer to our slot sites list is Buzz Slots. Traditionally, Buzz is known for its brick-and-mortar bingo halls and amazing online bingo gaming experience. However, in recent years, Buzz Slots has also evolved into one of the best slot sites online. Packed full of games including a range of Slingo titles from top-shelf developers, we’d strongly recommend you check them out if you’re considering playing online slots.

Bet £20 Get 110 Bonus Spins

• Bet £20 Get 110 Bonus Spins
• Bonus Spins On Midnight Wilds

Claim Bonus

First depositors only. Deposit & Stake £20 on Midnight Wilds slot game: Get 110 Bonus Spins on Midnight Wilds slot at 5p (5 lines x 1p) per spin. Jackpot cannot be won when using free spins. Customers will also be eligible for existing standard sign up bonuses if they stake an additional £10 on Bingo, see T&Cs for details. £5 min. withdrawal on winnings. T&Cs apply. 18+ BeGambleAware.org. Please play responsibly.

5. Wink Slots – 30 No Deposit Free Spins/100% Deposit Match Up To £100 + 30 Free Spins

Wink Slots is part of the famous 888casino brand. Like 888casino, Wink Slots offers the best online casino games but with a heavier focus on the online slots arena. That means not only can you grab a generous welcome offer when you sign up, but you can also play top slot games from game providers like NetEnt, Microgaming, and NextGen.

100% Up To £100 + 60 Free Spins

• 100% Bonus Up To £100
• 30 Spins On Top Slots

Claim Bonus

New UK players only. Register & get up to 30 Free Spins [FS]. 10 FS*3 over 3 days upon login. Must be claimed by 23:59 on day of grant; wins set at £3–£12 in bonus funds. Non-funded player balance capped at £100 exc. jp. wins. Welcome Offer: Min £10 deposit, get 100% Bonus (max £100) + 30 FS. Must be claimed within 7 days. Bonus wins capped at £400 exc. JP wins. General: FS valid on specific games & valid for 7 days once claimed. FS wins granted in bonus after all FS used. Bonus valid on specific games only. Wagering req. apply: 30x bonus funds (vary by game); T&Cs Apply.

6. OJO Casino – 50 No Wagering Spins + 30 Extra on Book of Dead

There’s a good chance you’ve seen OJO Casino all over your television recently, a UK casino site that offers players some of the best no wagering bonuses around. When you join OJO Casino, you’ll get a bundle of no wagering spins as well as access to thrilling slot games from all the top developers.

80 Free Spins No Wagering Requirements

• 80 Wager-Free Spins On Sign Up
• 700 Slot Games Available

Claim Bonus

This offer is only available for first time depositors. Min deposit is £10. For every £1 you deposit, 1 Free Spin will be credited. Up to 50 Free Spins on Book of Dead. Spin Value: £0.10. After your first deposit you may claim your 30 Extra Free Spins by visiting the Kicker Section. No min withdrawal. This offer cannot be used in conjunction with any other offer. This offer is only available for specific players that have been selected by PlayOJO. If you have arrived on this page not via the designated offer via PlayOJO you will not be eligible for the offer. OJO’s Rewards and Game Play policy applies.

7. Betfred Casino – Bet £10 Get 100 Free Spins

Next on our best slot sites list is Betfred Casino, the online casino arm of the leading UK sportsbook brand. If you’re looking for a name that offers sports betting alongside casino and bingo games, Betfred Casino could be the one for you.

Stake £10 Get 100 Bonus Spins

• Bet £10 Get 50 Free Spins
• Winners Of Best Playtech Casino 2018

Claim Bonus

New customers only. 18+. Promo code CASINO100. £10 min transfer and stake on Slots at Betfred Casino within 7 days of registration. Minimum 5 game rounds. Game restrictions apply. Max 100 Free Spins. 50 Free Spins on Lucky Emeralds or Blue Wizard followed by 50 Free Spins on selected games within 48 hours. £0.10 per spin. Free Spins must be accepted within 3 days. 7-day expiry. Payment restrictions apply. SMS validation may be required.

​8. Casinoland – Get Up To £800 Welcome Bonus

One of the beefiest welcome bonuses around comes from Casinoland, where players can net up to £800 in total bonus funds spread across their first four deposits. As well as kick-starting your time at the site with a bankroll boost, you’ll get access to top games like Age of the Gods, Rainbow Riches, Cleopatra, and other leading video slot titles.

Get Up To £800 Welcome Bonus

• Up To £800 Welcome Bonus
• Latest Slot Games

Claim Bonus

#AD New customers only. Opt-in required. 1st deposit bonus 100% up to £200. 2nd deposit bonus 50% up to £200, 3rd deposit bonus 25% up to £200, 4th deposit bonus 25% up to £200. Min deposit £10. 40x wagering, 30 days to complete wagering, eligibility, game weighting and game restrictions apply. Max Bet with bonus funds £5. Max withdrawal from bonus funds is £2000. Eligibility restrictions apply, cash balance can be withdrawn at any time. Neteller & Skrill excluded. Full bonus terms.

​9. Playzee Casino – 100% up to £300 bonus + 100 Zee Spins + 500 Zee Points

Playzee Casino is a new casino run by expert operators White Hat Gaming. When you join Playzee you can earn Zee Coins, which can be traded in for perks and bonuses like free spins. What’s more, you can get a huge bundle of free spins just for signing up. 

100% Up To £300 + 100 Zee Spins

• 100% Bonus Up To £300
• 100 Zee Spins + 500 Zee Point

Claim Bonus

18+. New players only. Min Deposit £20 Max Bonus Bet £5 Winnings from spins capped at £50 100 Zee Spins valid on Starburst (first 10 credited immediately upon first deposit; rest credited at 07:00 GMT at 10/day). Spins must be used by 23:59 GMT of the day on which they are credited to player account, any unused shall be removed. Bonus funds must be used within 30 days. Bonus funds are separate to Cash funds, and subject to 35x wagering (bonus + cash). Full terms apply. BeGambleAware.org

10. Jonny Jackpot – Get Up To 500 Bonus Spins

Making up our list of the best slot sites is Jonny Jackpot. Jonny Jackpot is one of the best new online casinos around and offers an extensive slots library with over 800 different titles. If you are looking for an endless list of the best slot games from top game developers like NetEnt and Microgaming, then Jonny Jackpot is for you.

Get Up To 500 Bonus Spins

• 500 Bonus Spins
• Bonus Spins On Book of Dead Slots

Claim Bonus

18+. New players only. One welcome package per player. Max bonus bet £5, Min deposit £20, 1st deposit: get 100 bonus spins, 2nd Deposit: get 75 bonus spins, 3rd deposit: get 125 bonus spins, 4th deposit: get 50 bonus spins, 5th deposit: get 150 bonus spins. All spins are on slot game Book of Dead only. Bonus funds must be used within 30 days and bonus spins within 7 days. Spins winnings credited as bonus. Bonus funds separate to Cash funds, and are subject to 35x wagering and withdrawal requirements. Terms Apply. BeGambleAware.org.

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.

Welcome Bonuses And Existing Customer Online Casino Promotions

There are three different types of slots bonuses that you will find on UK slot sites. Sometimes the best slots sites will combine these deposit bonuses into one easy to digest welcome package. However, some video slots sites will base their entire proposition around one type of deposit bonus – here’s what you need to know.

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.

Wagering Requirements

When we evaluate the quality of a new player bonus, we always look at the wagering requirements that are stipulated. Wagering requirements are used by slot sites to ensure that bonus funds are not withdrawn from the site by new players before being used. However, some slot sites abuse their powers.

We are happy to see fair wagering requirements stipulated on new player bonuses as long as they are within reason and not designed to ensure that players have zero chance of walking away a winner when using their slots bonus.

Every slot bonus on GamblingDeals.com is shown alongside wagering requirements so that you can adequately assess the bonus before clicking through.

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. When we compile our list of the best UK sites, we always ensure that you have the option to play with some of the best progressive jackpot slots.

Other Critical Factors We Assess at UK Slot Sites

The best slot sites also offer an abundance of benefits when it comes to customer experience, player safety, and deposit and withdrawal options. When our online casino review team reviews whether a slot site is ready to appear on our top sites list, we always make sure that our review looks at these critical factors.

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.

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.

Progressive Jackpot Slots

It’s important for the best bonus slot sites to offer a great range of games. Progressive jackpots are one such example that are a thrilling addition to any games library, shaking up traditional gameplay with variable prize amounts. These slots work by taking a portion of every wager on the game and adding it to an increasing jackpot. Once a player lands the jackpot, it resets and starts building up again. 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.

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 Variations

There are many different formats and game mechanics involved in slots, each offering something different. However, we can initially group slot games into three 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.

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. 

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.

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.

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. Players often turn to PayPal casinos and other e-Wallets to ensure fast payouts. With these methods, you can expect your funds to land in your account within three days, while traditional banking methods could take up to seven days.

There are plenty of PayPal alternatives that also offer fast withdrawals. Services such as Trustly and AstroPay have become increasingly popular thanks to their ease of use. Another option to look out for is Visa Fast Funds — with this service you can continue to use your debit card and receive your funds the same day.

The Best Slot Games Available at UK Slot Sites

There are some brilliant slot games available on the best UK slot sites. Some of our favourites are the games offering the biggest jackpots, like Mega Moolah and Mega Fortune. However, there’s so much more to shout about.

Top 10 Online Slots

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.

Riche 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.

2022’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.

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!

Highest Payout Slots

There are several ways of measuring slot payouts — one that is most commonly used is the Return to Player (RTP) percentage. RTP states how much of the money wagered on a slot game during its lifetime is returned to players. A high RTP is not a guarantee of any expected payouts, however. It is in fact an average of millions of different transactions made on the slot. As such, your payout from the slot may not match up to the high average advertised. Check out some of the best paying slot games below:

• Ugga Bugga (Playtech) — 99% RTP
• Mega Joker (NetEnt) — 98.9% RTP
• Jackpot 6000 (NetEnt) — 98.86%
• 1429 Uncharted Seas (Thunderkick) — 98.6% RTP
• The Catfather (Pragmatic Play) — 98.1% RTP
• Jokerizer (Yggdrasil) — 98% RTP
• Ooh Aah Dracula (Barcrest) — 96% RTP

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.

For this reason, it’s often helpful to look at the volatility or variance of a slot game when assessing its payout potential. 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. 

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.

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.

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.

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.

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.

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.

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.

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?