Best Slot Sites 2020

Online casino sites and bingo sites have a huge range of slot games available for everyone to play. These casino classics vary from table games like blackjack or roulette and both have a few different variations to choose from. However, if you’re looking to play some of the best online slot games, we suggest looking at these top slot sites. Fortunately for you, we’ve gone ahead and provided a list of them all below.

List of Top Slot Sites

Every online casino will have some sort of online slots selection to offer their players. Due to how many different slot websites there are, it can be confusing players to find the one right for their needs. Therefore, we’ve consolidated all the top slots sites into an easy list for you to find the best one for you.

Our aim isn’t to simply provide you with the best online slots sites. Instead, we’ve clearly detailed why and how to play, the top attributes of all the best UK slots sites, and about choosing the best bonuses. The reason behind all of this is it lets you identify which are the best options for you and we leave you to make an informed decision.

What is a slots site?

Simply put, a slot site is a website where you can play online slot games – and more often than not, online casino games too. There are hundreds of independent slots sites out there. Some sites are primarily there for bingo, and have slots to play while you wait for your game of bingo to start. Other sites are purely slots-focussed. And the rest have both slots and casino table games to enjoy. So, in essence, there are three main types of games on offer.

Slots sites are renowned for their games – they’re always fun to play and are feature-rich which often makes them stand out from other casino games. Another reason they’re a UK player favourite are that usually they pay out substantial sums of money to those that win. You can get different levels of slots games, from low variance (or low volatility) which results in smaller wins more often, whereas high variance (or high volatility) equates to bigger sums but less often. All of the sites you will find in the United Kingdom are regulated and licensed with the United Kingdom Gambling Commission.

Why play at online slot sites?

There are three main reasons why you might choose online slots over more traditional casino games.

Simple: Slots are a lot more straight forward than online casino games. There’s very little skill or strategy involved. Just because they’re simplistic, it doesn’t mean they’re not exciting though. Find lively animations, stunning themes and superb bonuses. What’s more is they’re easy to play whilst waiting for your next bingo game.

Budget accommodating: There’s a slot game for every bankroll, from the beginner dipping their feet to the casual player, right up to the casino playing veteran. From penny slots to progressive jackpots, the choice is yours. You can even play free slots with demo modes available, before playing for real money.

Wide selection: While classic casino table games like roulette and blackjack do have their variations, the number of slots games on offer is on another level. Most iGaming software developers make slot games, and many top slot sites can count over 500 great titles in their catalogue – so the options really are near endless.

How to play online slots

For new players it’s easy to see how multiline video slots can look daunting. It’s actually pretty simple to get your head around this casino classic once you know how. Whether you’re playing slots for free in demo mode or for real money, here’s how you play.

Look at the paytable: A paytable tells you how much you can win based on your bet, and your minimum and maximum stake options. Your potential payout may be displayed in ratio form, percentage terms, or in multiplier values e.g. x2. The game’s bonus features, which include multipliers, can be checked to see if there are other ways to maximise your possible winnings.

Set the stakes: In many of the best online slot games, players bet with ‘coins’ that have a real money value. The coin value is set to a certain value in some games, however in some, you can set this yourself. You must make sure your coin value is suitable to your bankroll though, as you don’t want to use all your budget in the first couple of spins.

Choose your paylines: Most of the best online slots have multiple paylines. Betting on more lines can increase your chances of picking up a win. It must be said though that the more paylines you bet on, the more you inevitably wager, so do so with caution.

Hit spin: When you’re happy with the wager, you hit spin. If you get lucky, you’ll certainly know about it! Usually, a congratulatory message appears on screen along with some celebratory music. Play slots for real money? Your winnings will be credited to your account.

What factors do we use to choose the best slot sites?

Deciding which slot sites are the best is a long process and we take all factors into consideration. Our team works hard to discover new UK slot sites and puts each one through the same tests and if they pass, we recommend them, to our readers. If it’s not on our list, there’s a good reason why!

Slots & Casino Games: Having a wide selection of slots to play is a great start for any slot site. However, having a good range of table games and other online casino games to play is another feature we look for. Nowadays, plenty of players are branching out to other games, including live casinos and online bingo.

If you enjoy the thrill of big payouts, progressive jackpots offer players the chance for players to win it big. Progressive jackpots are often in a network of other jackpot games by a specific developer. Each spin on a jackpot slot will deposit a small amount into the collective prize pool. The jackpot pool amount can reach into the millions, which is why these games are so popular for players who love slots.

Mobile Experience: With mobile casinos becoming the norm these days, many of the best online casinos and the best slot sites in the UK are trying to deliver a mobile experience. Many mobile casinos offer an app to which you can download from your phones or tablets. If you’re not interested in downloading a mobile app, you don’t have to miss out! UK players can simply log into their accounts through their mobile devices.

Bonuses & Free Spins: We all like playing online slot machines but there’s nothing better than choosing a top slots site that has a tempting casino bonus to claim. The bonus amount depends on where you play slots, and many sites have unique welcome bonus and extra spins for you to enjoy.

Game Providers: Software plays a big part in what kind of experience you’re likely to have at a slot site. The more game providers the online casino has, the more likely you’re going to find something you like. If you’re a massive fan of Netent or Microgaming slots but the site you’ve picked only has selected slots from Playtech, it’s worth finding a site that has a wider variety of software providers, which include some of the best bingo softwares and also new bingo softwares, like Gamesys, Cassava, Cozy Games and a lot more!

What kinds of online slots can I play?

Regardless as to your taste, there’s certainly a slot game for you. The variety of titles to choose from is massive, and is in fact growing all the time. You’ll be pleased to read that our recommended casinos feature a whole host of games in all of the below categories.

Classic slots: these are sometimes referred to as ‘old-school slots’ and are based on the original Las Vegas slot machine model – typically 3 reels and 1 pay line. This sort of traditional gameplay is seen in Microgaming’s Jackpot Express, and a more contemporary featured one can be found in Netent’s Grand Spinn.

Pub slots: these are generally a variation on the classic slot that also have features you’d find on the traditional pub fruit machine, like nudge and hold. These can’t be played at all online casinos, though these slots are still pretty popular. An example is Microgaming’s Couch Potato.

Video slots: this term is a broad category that can be used to encompass most slots online today. Put simply, a video slot refers to any sort of 5-reel slot game that features animation. The most popular online slot games could be classed as video slots – examples including Starburst and Thunderstruck.

Multiline slots: most modern day online slots are multiline games (that is, they have more than one pay line). This broad category applies to a wide range of game styles. Anywhere between 1 and 100 pay lines you can play most slots with. Some are win-both-ways games, where the pay lines run both left-to-right and right-to-left, and some are ways-to-win games, which instead of pay lines pay out when you get three or more symbols left to righton adjacent reels in any combination. Immortal Romance and Raging Rhino are good examples of these types of multiline games.

3D slots: one of the most exciting innovations in the online slot industry, 3D games have brought the themes, animation and gameplay to whole new levels. These 3D slots have high production values and could arguably rival some of the best video games for graphics. Some of the most poular 3D slots include Gonzo’s Quest and Jack and the Beanstalk by Netent and Jurassic Park by Microgaming.

Progressive jackpot slots: those looking to win more life-changing jackpots should check out progressive jackpot slots. These slots are networked into a central prize pool where a percentage of every losing spin goes into the jackpot regardless as to where you play in the world. As a result, jackpots can grow very quickly, sometimes to tens of millions of pounds. The most popular jackpot slots are Mega Moolah by Microgaming and Mega Fortune by Netent.

Flat top slots: this is another name for a slot that idn’t a progressive jackpot game (that is, there is a max pay out to be won). The pay outs on flat top slots vary greatly, where it typically depends on the coin size, number of pay lines and numbers of coins that can be played per line.

What other games can I find at UK slots sites?

Lots of casinos offer a wide range of land-based casino style games for their players. If you’re a fan of roulette games, plenty of online slot websites will offer a selection of roulette games. These often vary from the popular European version, to American Roulette, Double Ball, Lightning Roulette and much more.

Blackjack has been a casino staple since casinos and online casinos began. These games have a high return rate, if you know what you’re doing. There are many different types of blackjack and these games transfer exceptionally well to the online casino version.

If online poker is something you’re into, you might want to head over to the video poker section of one of the better slot or casino sites. Video poker games are some of the most diverse titles in the industry and players can choose between anything from Caribbean Stud, Deuces Wild, Jacks or Better and much more.

If you enjoy the high-street casino experience and are looking for something to closely replicates it, you might want to visit a casino site which provides you with a live casino. Although you won’t find online slots in a live casino, you will be able to play live dealer games like blackjack, online roulette and poker.

Everyone has a mobile phone, and this has caused plenty of mobile slot websites to pop up in all corners of the internet. Over the last few years this has seen a rise in mobile slots which is great news for all players who like to enjoy their experience whilst on the go. Mobile slot machines are optimised to work from both mobile web browsers and casino apps.

Claiming a slots bonus:

We all like getting our hands on a juicy bonus or welcome package. There’re are many different forms of bonuses available at slot websites and some are better than others. Below are some of the bonus types you’ll find.

Free Spins: This is one of the most popular forms of bonus and welcome package you’re likely to find at UK slot sites. Often referred to as bonus spins or extra spins, online casinos will often provide free spins on some of the more popular games, giving you a chance to win some real money. Some online slot websites provide free spins no deposit and other are a deposit bonus that require a minimum deposit to receive them.

Reload Bonus: Most casino sites have bonuses to entice new players in. Loyalty to a specific casino site can still pay off, however. Many sites will have some promotions there for existing players, which they might provide on a weekly or adhoc basis. The reload bonus often requires you to play through a certain amount of cash throughout the week and the site will then dish out some bonus spins or a small deposit bonus for your custom.

Free Tickets: If you’re playing at a bingo site, you might find that some of these sites will offer you free tickets as a welcome bonus or for playing a certain amount of time throughout the week. Free tickets let you play bingo games for free and if you do well, you could end up winning real money in the process.

No Deposit Bonus: These aren’t as common as they once were at slots casinos, but are one of our favourite bonuses to recommend. No-deposit bonuses are perfect for the players who enjoy playing slots online. The reason for this is that they come in many different forms, ranging from free spins to cash bonuses and can be used throughout the site. The downside to this bonus type is that they normally have a high wagering requirement.

Deposit Required: Also referred to as a match bonus, a deposit required offer will reward you as soon as you make your first deposit into your account. These are normally a percentage of your deposit credited into your account and up to a certain amount. Some slots sites UK will give you a match bonus for the 1st deposit and others will give you a bonus for up to your first 4 deposits, depending on which site you pick.

Promo Codes: There are a few slot websites and bingo sites which accept promo codes. These can work similarly to bonuses that require a deposit or like a reload bonus that the player has control over. Normally when you click to make a deposit, there will be a field where you can enter any bonus or promo codes.

Best Slots Sites Welcome Bonuses in 2020

Rating Slot Sites Bonus Claim Here
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Choosing the best welcome bonus:

The primary goal of any top slot site is to draw your attention, typically with a welcome bonus package. Making sense of this offer though isn’t always easy. Have a read of our questions below to determine what you should be finding answers to when weighing up each bonus.

How is the bonus triggered?

Find out what the necessary actions are to trigger the slots bonus, and decide if you’re comfortable with them. A bonus is gifted on the first deposit made at almost every casino, though you should always check what the minimum deposit required to trigger the bonus is. Usually, this is £10 or more. Note that depositing £5, and then £5 again will not qualify you. Also bear in mind maximum bonus amounts – and remember that if you deposit more than the maximum amount on your first deposit, your bonus will still be capped at the max amount.

What are the wagering requirements?

You should always check the wagering requirements on any bonus, or winnings from any free spins. Typically, you’ll be required to turn over your bonus or winnings a specified number of times before you can withdraw any winnings. Also, when hitting these wagering requirements, make sure you don’t place more than any maximum bet value (often £5) otherwise your wagering won’t count towards the specified number of times needed in the offer before withdrawal can be made.

What game restrictions apply to the bonus?

Further restrictions may apply in terms of the games you’re allowed to play with the bonus money. Slot machine sites will normally restrict players to wagering bonus money on popular, low volatility slots like Starburst. Chances are you won’t be able to spend your bonus on your favourite progressive jackpot game chasing those bigger wins. You should shop around though, as you will get some bonuses that are more flexible than others in regards to the games available to you.

Is your payment option valid for the bonus?

Please check the terms and conditions of the welcome offers to see if your preferred payment method will make you eligible for the slots bonus as depositing by eWallet, for instance, may not be valid. Examples being Neteller and Skrill commonly not being accepted.

Is there an expiry time on the bonus?

Take note of the expiry terms of your bonus if you don’t plan to wager all your bonus money on day one. Usually a bonus is available to claim upon registration for seven days or more – though some online slot sites restrict this to only 48 hours. Once the bonus is claimed, it will only usually be valid for up to 30 days before it is forefeited. Those bonus funds are there to be spent, so don’t forget them – or you’ll lose them.

What is RTP and how does it work?

New players won’t have come across the term RTP before. What RTP stands for is return to player, which is the amount (expressed as percentage) that you can expect to receive back after playing the game.

For instance, if a game on a slot site has a 96% RTP, and if you play over a long period of time and wager £100, in practice you should end up with a bankroll of £96. In other words, from the RTP you can derive the House Edge –  so an online slot with a 96% RTP has an effective House Edge of 4%.

You should bear in mind that this is a calculation in theory and individual wins and/or losses are not likely to be reflected by the RTP. The reason for this is that the best online slots are games of chance that use a random number generator (RNG), where the outcome of any spin cannot be predicted or influenced.

Slot Game RTP
Cleopatra (IGT) 95.02%
Gonzo’s Quest (NetEnt) 96%
Starburst (NetEnt) 96.1%
Mega Moolah (Microgaming) 88.12%
Fluffy Favourites (Eyecon) 95.3%
Rainbow Riches (Barcrest) 95%
Wolf Gold (Pragmatic Play) 96.01%

The Random Number Generator (RNG)

As an online gambler, you’ll have no doubt seen references to a ‘random number generator’, but what is the RNG and how does it affect the games you play? Random Number Generator (RNG) is software used for games of chance. It generates a sequence of numbers, cards or symbols that can’t be predicted at a higher rate than random choice. In short, RNG is the cornerstone of randomness of online slot, table and casino card games and at the core of the fairness and legitimacy of all the games. With RNG technology, players can be assured their game is fair and random.

Brief history of slot machines

liberty bell machine pre slot sites

It all started with the Liberty Bell in 1887. Charles Fey experimented with various mechanical spinners in the years that followed. In 1895, three reels and fixed payours were offered, starting a gaming revolution in the United States. It later spread to UK players and Europe. Bally Technologies and similar companies rolled onto the scene a few decades later with a selection of video slots. By 1963 Money Honey made slots more digital. These video-based games set the trend for video slots as we know them today.

If it weren’t for digital fruit machines, there may not have been online slots. It was around the millennium that the best online slots finally came into being. Since then, thousands of slot games have been developed by dozens of software companies. In 2020, there are more slot machine games than ever before (and this number is always growing).

Today’s slot site software

Clearly, for most of us, the best feature of a top slot site will be the quality and quantity of games on offer. As you may already know, there are loads of different software companies, from industry rockstars like Microgaming, Netent and Playtech, to new studios like Red Tiger Gaming. Each one has their own unique graphical styles and game types, all with varying volatility, RTPs and mathematic models behind them.

Before making a deposit at an online slots site, you should look to see which slot games you can play there first as not every casino brand is partnered with every software supplier. With the likes of Microgaming and Playtech, it is not uncommon for them to be an exclusive sole supplier at some brands. Others will partner with multiple suppliers in order to offer a wider range of games. The latter are the better slot sites to play at, purely for their variety in game offering.

You can find out which suppliers have their games on each slot site by reading the individual review pages linked to from our listings above.

What is the best online slot site?

There’s no straightforward answer to this question and the ‘best slot site’ largely depends on the user. For lots of players, the best slots site is one that offers the largest bonus to play with. Whether this is a bonus no deposit type, or a massive match offer, all of these can be key indicators as whether you’ll enjoy what the site has to offer.

Another deciding factor is whether the casino online has a good selection of games available. Having a smorgasbord of slots for you to play is a great start but if you want to dabble in other game types, you want to find a casino that provide enough games to keep you interested.

Tips to maximise your slots site experience

As we’ve just mentioned, there are loads of different sites to play slots at. And as such, it may come as little surprise to you that the playing experience at each slot site can vary quite significantly from one another. That said, there are still certain things in common you can do to get the most out of your gaming:

  • Experience progressive jackpot slots – these provide the chance to win a life-changing sum of money with a single spin. This kind of jackpot increases constantly in real time and grows until it’s won. It’s be known for progressive slot jackpots to reach tens of millions of pounds.
  • Check the slot site’s terms and conditions – before accepting a slot or casino bonus, it’s important to fully read the terms and conditions on-site. Things like wagering requirements, the contribution different slot games make to cleaing the bonus, and the maximum conversion amount should be given close inspection. Checking payment methods accepted for deposit and withdrawal is also critical for convenience.
  • Use promotions and special offers – our featured casinos and slot sites have regular promotions and special offers with rewards such as deposit matches, bonus spins and loyalty points. You should check this page frequently for the latest slots promotions, as well as the site’s own promotions page. Signing up to deals via email will also help.

Payment options

There are many payment methods to choose from when playing at slot websites. These can vary from e-wallet options like Skrill, Neteller, Entropay, EcoPayz, EcoCard, PayPal, Paysafecard, iDEAL, Boku, Trustly and Zimpler. Some recommended slots casinos accept more payment methods than others, so be sure to check what’s available before you sign up to a new site.

As well as accepting an array of e-wallets, all the best online slots sites accept major credit and debit cards. These are a great to use for claiming a particular bonus you’re interested in but are usually slower than e-wallets when it comes to withdrawing winnings.

How do you claim online winnings?

Claiming what you won from a game couldn’t be simpler – especially small prizes. Any winnings earned from normal gameplay will automatically be added to your account and can be withdrawn at your convenience. If you’d prefer you can let your slots winnings build up in there before withdrawing a lump sum all at once.

Winning a massive jackpot or uniquely large payout will require you to check the online slots operator’s terms and conditions to confirm the max that can be withdrawn at any given time. Some slots sites require the player to contact them directly for larger winnings, in order to confirm their identity and the claim’s legitimacy.

Licensing for UK slot sites

All slot sites listed and reviewed here at are licensed by the UK Gambling Commission. Casino operators should offer a fair, safe and secure service to their customers as stated in the terms of these licenses. The site risks penalties, fines, and in extreme cases, having their licenses revoked if they are in breach of this.

Ultimately, with your chosen slot site licensed, you can rest assured your personal data and financial transactions are secure, and the gameplay at the casino is fair. It also means that should you have a complaint against the online casino, you are within your right to make it.

Most operators have businesses based outside the UK. Other gambling jurisdictions include Malta, Alderney and Gibraltar. Those operators that do have bases outside the UK will also have been issued a separate license from their respective gambling authority.

Alternatives to online slots

A game that characterises the same excitement and ease-of-use that slots online does is video poker. Place a bet, spin the reels and optimistically anticipate a fantastic poker hand. If you’re looking to test your skill and nerve, this is a great introduction into the world of online poker.

Nestled away in sections of online casinos labelled ‘other games’, you’ll find quick-to-play games from online scratchcards to electronic horse racing – where you play the odds of winning a virtual race. With rules and strategy barriers to a lot casino table games, these other games are excellent alternatives to slots.

Slot Sites FAQs