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Online Slots: Complete Guide

Step aside Roulette, and move over Blackjack - Slots is the king of casino games now! Play for free here on CasinoGuide and then find a great Slots casino to play at for real.

Help yourself to our selection of the finest online Slots games with no download or registration required, and when you're ready claim your bonus at one of the best real money online Slots casinos in the UK - listed below!

Best Online Slots Websites 2020

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Play Online Slots: UK 2020 Guide

Feel the thrill as you watch the reels spin! Tremendously popular amongst casino fans of all ages, online Slots are now available in the thousands for players to enjoy.

Join the online Slots community by signing up to one of our recommended online Slots casinos below and secure your CasinoGuide exclusive bonus today! You can be sure you're playing safely - all our recommended casinos are licensed and regulated by the UK Gambling Commission.

Online Slots: Discover The Fun!

Playing Slots online is a fun and simple distraction from everyday life. It’s not complicated, nor does it require hours of practice. Just click (or tap, if you’re on mobile), and play!

The vast amount of online Slots games available can be a little daunting. Fortunately, we have done the hard work for you! Simply pick from our list of online Slots sites (UK Gambling Commission approved) and grab your welcome bonus. Then, treat yourself to some quality time at a fantastic Slots casino UK players love to play at!

Sometimes though, we understand that it's better to try before you buy. Here at CasinoGuide, we've collected together some of the finest Slots games on offer. You can play any and all of the games on our site for free, for as long as you like, with no download or registration required. They even work on mobile!

Examples Of Online Slots Wins

Here is a video of a YouTube user and online Slots streamer, who managed to hit a massive lucky streak. Watch him netting over £2500 of winnings in less than 10 minutes! The game being played is 'Icy Wilds' - an IGT Slots game. Get in on the action with your Slots sign up offer today!


If that isn't enough to inspire you, watch the same player win nearly £1000, using small stakes, in under half an hour! The game being played is 'Dracula's Family' - a Playson Slots game.

Online Slots With Bonus Offers

When playing at a Slots casino, UK players have the best of all worlds. A vista of signup bonuses, deposit bonuses, free spins, and more await you at the Slots websites listed above. If you are looking for online Slots with bonuses, you have come to the right place.

Most online Slots sites will allow you to use these bonuses on whichever Slots games you choose. Others are valid on a selection of games designed to give you a varied overview of that casino's games library.

Online Slots Welcome Bonus

There are many different types of Slots bonus. The first, and most common, is the Slots welcome bonus. This is a gesture from the Slots websites to say thank you for joining their casino. This is also sometimes known as a ‘Slots signup bonus’. Online casinos are hugely competitive, and will do all they can to earn some customer loyalty from you.

You can also expect to be rewarded for playing Slots online on mobile devices. There is usually an extra bonus to be claimed for downloading casino apps after signing up.

Online Slots With Free Spins

As well as the Slots welcome bonus, you will also find many Slots sites with free spins. Typically, this will be offered as a sweetener to Slots with sign up bonus offers. One typical example would be ‘£50 welcome bonus and 100 free spins on Starburst’.

Playing Slots with free spins is an easy way to get into the online Slots experience. It allows you to enjoy the thrill of playing Slots online, with minimal risk. Check out our exclusive free spins casino offers to claim yours!

Online Slots Bonus Codes

Often used to tempt existing online Slots players back, Slots bonus codes are typically sent directly to you via email. The value of each online Slots bonus code varies greatly. If you have been a regular player over a long period of time, you should receive more lucrative online Slots bonus codes.

If you aren’t yet signed up, you can still get your bonus. Just head to the top of the page, pick a casino you like, visit the review page, and scroll down to the bonus section. Where there is no bonus code required, your bonus will be automatically applied once you sign up.

Online Slots With Deposit Bonus

This is where the real money is! Online casinos love it when you make a deposit as it shows that want to start playing for real. To get the biggest bang for your buck, an online Slots deposit bonus is what you need. At CasinoGuide we pride ourselves on listing the very best Slots deposit bonuses available to new customers, so you can get the most out of your online Slots experience.

It couldn’t be easier to claim your Slots bonus. We’ve done all of the hard work for you by finding the best Slots with deposit bonus offers. We display the biggest Slots deposit bonus UK casinos have to offer - all you need to do is choose one from our list of the best casinos for online Slots.

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All of the recommended casino sites above come with a highly generous Slots bonus. Some of these are even exclusive to CasinoGuide!

Online Slots Tournaments

Looking for a way to add even more excitement and competition to your online Slots experience? You may enjoy playing in a Slots tournament online! These add an additional layer to online Slots play as you are competing against other people around the world, not just against the game you've chosen to play.

Essentially, an online Slots tournament typically works like this:

  1. You buy in and receive a certain amount of credit (the same as everyone else who is competing in the tournament).
  2. The credit you receive from the buy in is the only money that you pay during the tournament.
  3. You use your credit and try to win more points than the other competitors within the time limit.

Usually there is some form of prize structure, with the top 3 players receiving winnings from the buy-in pot. This is what makes online Slots tournaments so lucrative and exciting. With just a couple of hours play you stand the chance of winning massive prizes from a single buy in!

Differences Between Slots Tournaments And Regular Online Slots

  • You only pay once, and you play for points - only the tournament prize offers cash wins.
  • Turbo and auto play features are disabled - it's totally on you to spin the reels as quickly as possible!
  • Once the time is up, your credits are gone - these are only for use during the tournament so it's important to spend them quickly.
  • You can win a lot, while betting little - regardless of which Slots game you play on.
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It's possible to win big money with online Slots tournaments.

Other Slots Tournament Types

  • Some Slots tournaments specify a single Slots game that all competitors must play on. The credits you get for your buy-in won't work with any other Slots games.
  • Slots duels - essentially 1 on 1 Slots tournaments where you compete against a single opponent.
  • Slots races - similar in concept to typical Slots tournaments, these are all about reaching a certain target of winnings or points before your opponents.
  • Real money Slots tournaments - these are more for the experts; Slots tournaments where you are playing with real money rather than bought credits or points. These can be highly lucrative, but also come with higher risks.

Online Slots Tournament Pro Tips

  • Decide in advance which game you will play, after having checked its paytable.
  • If you make a big win, don't stop to celebrate! Keep on spinning to make the most of your time limit.
  • Sometimes big wins aren't immediately shown in your credit, but don't let that slow you down - the win will show eventually.
  • Keep your focus and keep spinning throughout the time period to make the mot of your credits.

How Online Slots Work

Slot machines use random number generators, and the results of each generation are displayed in the form of symbols. This means that - contrary to popular belief - if an online Slots machine gives you a big payout you shouldn’t rush away; it might pay out again.

That being said, you should always know your limits, and know when to walk away! Play for fun, not for profit, and you’re a winner every time.

Bet Level And Coin Value

In online Slots, the bet level is the amount of coins you want to bet on each spin of the reels. For example, you win 100 coins at bet level 1. Winning the same 100 coins while playing at bet level 2 would net you 200 coins instead. However, it would cost twice as many coins to make the bet in the first place.

Coin value has a similar effect on your bet size and by extension, potential winnings. If winning 10 coins at a coin value of £1.00 gives you a win equal to the value of £10, winning 100 coins at a coin value of £0.10 would result in the same. Online Slots games that allow you to dictate both the coin value and bet level give you unmatched control over the amounts you are betting.

Lines And Ways

Many modern online Slots have adopted a new concept to replace the classic pay lines of old; these are called pay 'ways'. Classic paylines, as you probably know, require you to hit specific symbols across fixed lines on the screen in order to win. Conversely, ways are hit by simply having the requisite symbols one after another from left to right, regardless of their positions on the reel.

The ways are multiplied if one reel shows more than one of the same symbol. This means that when you are playing an online Slots game with 3 rows and 5 reels game that offers ways, you have 243 ( 3 x 3 x 3 x 3 x 3) different ways to win! Twin Spin is a perfect example of this.

Basically, when playing a game that uses ways, if the symbols appear on the reels in order, they pay out regardless of position. Each game will have more specific rules that come into play, and Megaways™ Slots follow their own sets of rules altogether, but this is the general gist of it.

Bonus Features And Free Spins

An important aspect to consider when choosing between online Slots games is the bonus feature. These are usually triggered by hitting 3+ 'scatter' symbols in one spin, and often lead to the largest wins. You can bypass the need for hitting 3+ scatters by playing a Slots game with the feature drop feature - check out our page on feature buy Slots to see which games offer this.

The most prominent and lucrative bonus features are usually the free spins, which use the same bet level and coin value as your original wager. During your free spins bonus, online Slots games often adopt different rules for payouts or symbol actions.

A good example of this is sticky symbols. Usually the same as wilds, these remain visible throughout your remaining free spin rounds. Another classic example is win multipliers, which are larger symbols that cover multiple spaces, even covering different reels.

Types Of Online Slots Games

A vast number of Slots websites exist nowadays, all boasting their own huge libraries of online Slots games. These have themes ranging from the classic fruits and bars, to movies, to supernatural forces, and much more. Check out our new Slots games page for the latest releases reviewed by our expert team!

However, there is more to knowing which Slots games to play than simply picking the theme. For example, when selecting their preferred type of Slots games, UK players have the possibility of winning regular small payouts or rare larger payouts. For the former, you should choose a high variance game; and for the latter, a low variance game.

The main variations of Slots online include:

Video Slots

Animated video Slots offer wonderful graphics and fascinating new themes. The symbols of the game are usually related to the overall theme of the video Slot. Often the paylines are more generous than other types of online Slots.

Having evolved from 3-reeled Slots, video Slots casino games have turned the excitement level up a notch. They offer a wider range of bonuses and compelling storylines as well as side games.

Progressive or Jackpot Slots

Generally these are the same as video Slots with one simple difference; an additional bonus pot. A progressive jackpot is collected over time as players continually place their bets.

A percentage of each bet goes into a bonus pot which could be won by any player. Depending on the game, this amount that can often run into the millions! If you’re feeling lucky and looking to win a hefty sum of money, you could be a record breaker with top games such as Mega Fortune and Mega Fortune Dreams. Try a progressive Slots game today!

Classic Online Slots

Love classic 3-reeled online Slot games? Many retro fruit, bar, and 7s Slots games can be found at the online casinos listed above.

These were the first to be introduced to the online gambling scene. There are countless classic online Slots offering anywhere between 1-8 paylines, and sometimes even bonus games or free spins.

If you like to have a dose of strategy with your online Slots, or are a bit of a Poker enthusiast, who not try a Video Poker online casino? This hybrid of online Slots and Poker is hugely popular among online casino game enthusiasts.

The Most Popular Slots Games In The UK

Online Slots has never been a more popular casino game with United Kingdom players than it is right now. The market is absolutely booming, with the top casino game software providers churning out game after game, each specifically tailored and designed to cater to a particular type of online Slots player.

Heavily featured in some of the best games are characters of supernatural ability, such as fairies and superheroes. Then there are exciting explorer games, such as Gonzo's Quest as well as Wild West theme games like Dead or Alive. Of course there remains the more standard themes you would expect such as fruit and gems.

Here are 3 of the most popular Slots games available right now:


Starburst is arguably NetEnt's most popular video Slots game. It has 5 reels, 10 paylines, and mixes vibrant colours with a classic fast-paced arcade feel.

Aesthetically, it is a very beautiful game thanks to its central theme of many-coloured jewels in a glittering cosmic background and the soundtrack is very engaging without becoming repetitive and annoying.

The most popular feature is the Starburst Wilds. When these symbols appear on one of the 3 middle reels, they expand across the entire reel and stay this way for up to 3 re-spins - which are essentially free spins on Starburst.

Ninja Fruits

This is a great adaptation of the classic mobile game Fruit Ninja, which enjoyed huge levels of popularity around the time that the smartphone (and in particular, the iPhone) started gaining ubiquity in the United Kingdom.

The free spin feature is unlocked when you have a Geisha symbol showing on reel number 1, 3 and 5 at the same time. As well as the free spins, you instantly win 5x your stake, making it a highly worthwhile mid-game bonus.

Sensei awaits you - time to start slicing and dicing those fruit!

Twin Spin

Rounding off our list we have a classic Slots experience, epitomised by its visual theme of fruits, numbers and bars and ameliorated by the addition of the unmistakable 'WILD' symbol.

The reason for the name 'Twin Spin' is that there are twin reels that are linked during every spin, which can be identified by the flashing golden lights around them. If you are lucky, these expand to further reels and sometimes even all of them, which obviously increases your chances of winning quite considerably.

With this feature, alongside 243 paylines and stacked symbols, there's plenty to be won while playing Twin Spin!

Online Slots FAQ

Is it legal to play Slots online for real money?

As long as you are a resident of the United Kingdom, and over 18 years of age, 'yes' - you can play Slots for real money online. Gambling in the UK is completely legal; operators are licensed by a regulatory body called the Gambling Commission, which ensures fair and transparent practices are used.

Some other countries do not allow online gambling so freely however. If you are outside the UK it is always wise to double-check the local laws to ensure you are able to play legally.

Are online Slots rigged?

If you are playing on Slots websites in the UK, such as those featured in our list above, then you can feel safe in the knowledge that the Slots are not rigged against you.

The Gambling Commission ensures this, as the Government body responsible for ensuring all casinos provide totally random and fair play to all customers. Every casino we recommend is licensed by the Gambling Commission.

How to play online Slots?

  1. Choose an online casino where you can play Slots online - one from our list above will be a good choice!
  2. Sign up at an online casino - the process should take less than 5 minutes
  3. Make your deposit by whichever means you prefer (i.e. credit card, PayPal, phone bill etc)
  4. Choose a game to start playing. Read the rules to see which reel combinations will give you a win
  5. Spin the reels, cross your fingers and have fun!

How do online Slots work?

Slots online work via the magic of random number generators (RNGs). These RNGs produce a unique and random set of numbers every time you spin the reels. Each of these numbers relates to a position on each reel. This is all done in the background, while you see animations and colourful graphics on screen.

Do online Slots really pay?

They certainly can, if you're smart enough and lucky enough! There are numerous stories of players who have won literally millions of Pounds playing online Slots. Countless more have won smaller, yet still life-changing, sums of money. Remember that even if you only withdraw small winnings, it's easy to do thanks to the wide variety of payment options available.

Play Slots Online Today!

Online slots games have taken the world by storm. Now there is a gigantic selection of Slots available online for you to enjoy. Some of the best Slots websites have also embraced gamification - rewarding you with extra points, credits, free spins and so on, just for playing.

We’re here to make your gambling life easier. That is why we provide thorough reviews and exclusive bonuses for all of the Slots websites we list. Simply choose from one of our recommended casinos below and benefit from a huge bonus just for signing up!

Slots Websites: Our Top Recommendations

  • Beginner-friendly
  • Mobile app available
  • Established reputation
  • No live dealer games
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