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Discover the best online slots at the leading casino sites in the UK. SlotSource sites review all the best online casinos, rating their features, bonuses, and above all, slot games. Whether you're looking to play progressive jackpots, Vegas slots, or the latest movie tie-in, you'll find up-to-date info about all the best UK slots sites. Check out our latest list below, pick your favourite, and start playing today!
Casino ProviderBonus OfferReview

100% Welcome Bonus up to £100 + 10% Cashback

18+ Only Welcome Bonus for new players only | Max bonus is 100% up to £100 | No Max cash out | Wagering is 35x Bonus | Max bet while playing with a bonus is £5 | Cashback is cash with no restrictions | Bonus excluded for players that deposit with Skrill or Neteller | Full T & C's Apply |


£30 Welcome Bonus + 10 Extra Spins

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 extra 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+ Please play responsibly.


120 Extra Spins on Starburst

18+. New depositors only. UK residents only. Minimum deposit £10. Extra Spins are valid only on Starburst and expire in 7 days. 10x wagering apply. Certain deposit types are exlcuded. Gamble responsibly.


100% up to £200 on your first deposit

18+ T&C Apply.


100% Welcome Bonus up to £100 + 50 Extra Spins

Valid for new UK players. Min deposit £20. Bonus Spins will be credited instantly. Deposits made via Neteller or Skrill are not eligible for Bonuses. Wagering requirements Bonus: 35x (deposit+bonus). Wagering requirements Bonus Spins: 40x

18+ only. Terms and conditions apply. Click Visit Site for more details
Find reviews and welcome bonuses for all the latest UK slots sites to hit the web in 2021. SlotSource's experts thoroughly review the newest casino slot sites launched throughout each year; this year in particular looks to be a huge year for new online casinos so keep checking back for info on all the latest slot sites as well as those set to hit the internet in the coming months! Exciting new sites are being launched often while setting new standards in bonuses, gameplay, features, technology and mobile gaming.
Casino ProviderBonus OfferReview

100% Welcome Bonus up to £100 + 10% Cashback

18+ Only Welcome Bonus for new players only | Max bonus is 100% up to £100 | No Max cash out | Wagering is 35x Bonus | Max bet while playing with a bonus is £5 | Cashback is cash with no restrictions | Bonus excluded for players that deposit with Skrill or Neteller | Full T & C's Apply |


100% up to £200 on your first deposit

18+ T&C Apply.


100% Welcome Bonus up to £100 + 150 Extra Spins!

18+ Full T&C's Apply. New players Only. £10 min deposit. £5 max bet using bonus. 40 x wagering applies. Bonus valid for 14 days. 15 Spins on Gonzo's Quest game will be credited instantly + then 15 per day for 9 days. Extra Spins valid for 72 hours from credit. Max Extra Spins winnings £100. Skrill + Neteller excluded. Always refer to Bonus Terms -


100% Welcome Bonus up to £100 + 50 Extra Spins

Valid for new UK players. Min deposit £20. Bonus Spins will be credited instantly. Deposits made via Neteller or Skrill are not eligible for Bonuses. Wagering requirements Bonus: 35x (deposit+bonus). Wagering requirements Bonus Spins: 40x


100% Welcome Bonus up to £400 + 50 Extra Spins

18+. New players only. One bonus offer per player. Minimum deposit £20. Max bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Winnings from Bonus spins credited as bonus funds and capped at £100. Bonus funds must be used within 30 days otherwise any unused bonus shall be removed. Bonus funds are 100% match up to £400 on your 1st deposit, 40% match up to £3000 on your 2nd deposit, and 60% match up to £1500 on your 3rd deposit. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds contribute towards any wagering requirements. Terms apply.

18+ only. Terms and conditions apply. Click Visit Site for more details

<p>NetEnt is a leading online slot developer that became well-known for amazing graphics, immersive themes, and innovative features. NetEnt games are famous for breaking traditions in the online slot world and bringing players new technologies, features and themes. With a diverse portfolio of over 300 slots covering all types of players, it is easy to be entertained and win big prizes when playing NetEnt slots. </p> <p>Read this comprehensive guide written by our team of experts at, and learn about NetEnt slot features, design, different slot types and all other aspects that make NetEnt one of the most popular online casino game developers. We also list the most popular NetEnt slots on this page and the <a href=''>best online casinos</a> to play them.</p>


<p>Microgaming is the longest-standing online casino software developer in the world. The company launched its first online casino games and first mobile casino software in 1994 and 2004, respectively. Having been powering the world's top online casinos for nearly three decades, Microgaming is a name that everybody in the igaming realm knows and loves. The good news is that Microgaming is not just living off its reputation and continues to develop some of the world's most innovative and exciting online slots.</p> <p>As our game experts at are passionate about slots, they follow Microgaming closely and have decades of combined experience spinning the reels of nearly every title released by this slot powerhouse. To share our passion, we wrote this guide to Microgaming slots that will introduce you to some of the best Microgaming slots of all times and its top new releases for 2021. In this guide, our team will also point you in the direction of the best online casino sites and bonuses to play Microgaming slots in this guide. </p>


<p>One of the longest-standing online casino software developers, Playtech boasts a catalogue of over 200 slots that feature on the <a href=''>best online casino sites</a>. Playtech is primarily known for its extensive selection of themed slots – from popular movies, comics, athletes and sports personalities. Playtech slots even feature the world&#39;s most famous superheroes. It is also known for its incredible selection of over 50 progressive jackpot slots. But if you are looking for classics, you will also enjoy Playtech&#39;s simple 3 and 5-reel slot games. Whichever Playtech slot you play, you can expect its stamp of quality thanks to amazing visuals, lucrative bonus rounds and innovative features. </p> <p>Read this guide written by our team of slot experts at, and discover the best Playtech slots, the top Playtech casinos and where to claim the most generous bonuses that let you spin the reels of Playtech blockbuster games without spending your own money. </p>


<p>IGT is the world’s largest provider of online slots. It is responsible for creating many of the best-loved games in history, including <strong>Cleopatra, Wheel of Fortune, Golden Goddess, Baywatch, DaVinci Diamonds</strong> and <strong>Kitty Glitter</strong>. IGT also produces a range of slots themed on popular movies and TV shows, including Star Trek, Star Wars, Jurassic Park, The Hangover and Ghostbusters.</p> <p>This page reveals the best online casinos with IGT slots. It will explain how to play free IGT slots games online before playing for real money. We will round up some of the most iconic IGT slots of all time, including the games with the highest RTP ratios, the newest IGT slots and progressive jackpot games that offer players the chance to earn huge sums of money. Read on to learn more about IGT slots.</p>


WMS Gaming is not only a major player in the iGaming industry, it's been a pioneer since 1974. Through a long and storied career, both as a traditional gaming company to a casino software developer, WMS has literally done it all thanks to its impressive selection of topnotch casino content distributed all across the web!

Play'n GO

When you want instant, HD-quality gaming that suits you, you turn to Play'n GO. Known across the iGaming industry as one of the top software providers, every Play'n GO slots offering brings a unique retro charm to the table. Play'n GO casinos are capable of offering an impressive blend of images, innovation and immersion!

Guide to Online Slot Sites in the UK 2021

This site is packed with the information you need on the best online slots. There are thousands to choose from so we have made your task easy by creating a list of the best slots to play, bonus offers and tips on how to play. Our guide covers high/low volatility slots, progressive jackpot slots, themed slots, classics and more. This page will cover all your questions and help you make a winning start.

Are Online Slots Rigged?

Any online slot housed inside a regulated online casino will be fair. Software providers at our recommended casinos are trustworthy because game manufacturers for licensed jurisdictions must have their Random Number Generator (RNG) certified by an independent agency. It is important to note that software providers create and control the games, casinos simply host them but are unable to influence how they work. Therefore, winning or losing at slots comes down to variance.

Slot providers only thrive if they are legitimate and fair, otherwise, people would simply stop playing. It is not in their long-term interests to rig slots. The UK Gambling Commission (UKGC) has strict licensing conditions regarding the setup of online slots. All of this means you can be fully confident that any slots we recommend have been tested, are fair and come from a trustworthy source.

Advantages of Online Slots Compared to Land Based Slots

Land-based casinos were the original home for classic reel slot machines, but we think online casinos have some pretty clear advantages when it comes to playing slots. For starters, you can play online from the comfort of your own home on your preferred device. You can do this anytime you want from any location. Online access also allows for a much larger player base and this means that progressive jackpots are much bigger online. Another key factor is game variety, you simply have a lot more choice online.

Online casinos are now home to literally thousands of online slots and you can search by software provider, theme, jackpot and more. You also enjoy great visuals, 3-D effects and razor-sharp sound effects. There is also the issue of bonuses; these are much more varied with online casinos and allow you to take advantage of free spins offers, specific game promotions and fun seasonal promotions. These bonuses are generally good value, always attractive and they give you more opportunities to play and win. The best online slots typically have much higher RTP's than land-based games so you are likely to win more money when your symbols match.

Advantages of Online Slots Compared to Other Casino Games

There are several advantages to playing slots online compared to other casino games - there are few games that are more accessible to newbies than slots for the following reasons:

  • Low minimum betting limits.
  • Large jackpots sometimes topping £1 million.
  • No real skill required, just spin!
  • Huge game variety and themed options
  • Multiple ways to win due to bonus rounds
  • Free spin promotions

Slots are also a huge amount of fun! The best slot games can keep you entertained for hours.

How to Win Online Slots

The best online slots in the UK are games that are fun and easy to play. Your appetite for risk and spending will play a role in how you approach games with an eye to winning. It always makes sense to manage your bankroll and select games based on your style of play and personal interests. If you like to play for a long time, then pick an entertaining low bet size and low volatility/variance game. If you’re not afraid of a little risk, then you can choose to play high variance/volatility and high limit slots in simple formats (3-reel classics etc) with a small number of paylines.

Take advantage of bonus offers to boost your spin time and winning chances. Games that display ‘all ways to win’ or ‘243 way to win’ have high hit ratios and tend to churn out more winners as do games with lots of paylines. It is best to avoid jackpot games as the overall RTP for normal spins on these games tends to be lower due to the jackpot contribution. Whatever option you go for, remember to play consistent and manage your bankroll properly. Discipline is important, no matter what casino game you are playing.

Do Online Slots Pay Real Money?

Yes, they do. Real money payouts are a common feature and this is ultimately why people play real money slots. The wins can be huge too, you can walk away with millions in fact- just like the lucky winner who won the Mega Moolah jackpot in September 2018 and took home a staggering 18.9 million euro!

How Do Casino Slots Work?

Online slot machines look similar the physical machines and most of the time, it is a simple matter of spinning the reels and seeing if you’re luck is in. One thing you will hear about at all of the best online slots is the random number generator (RNG). This is the software used to auto-generate the sequence of numbers that determines the position of the reels. It is the mechanic that makes online slots work while ensuring that all spins are fair and random. RNGs give everyone the same chance of winning, regardless of when they spin because they always produce random and different numbers every time you click the spin button.

It is important to note that the software providers create the games and the online casino is a platform that hosts these games. The software providers supply these games to thousands of online casinos around the world.

Progressive jackpot slot games work a little differently: they are all linked across machines, games, websites, and casinos - this combination is what leads to those massive total payouts. As soon as there is a winner, the game is reset and the jackpot begins to build up again.

Best Online Slots with the Highest RTP

Return to Player (RTP) is the percentage of all the wagered money an online slots game will pay back to players over time. For example, if you make a hundred £1 bets on a machine which has an RTP of 90%, you would expect to get back about £90 in wins. It’s a key statistic that many players look out for but should not be your ultimate indicator of whether a slot game is worthwhile or not. A high RTP on a low variance game will result in regular small wins but not many big wins. This may suit if you tend to spend long periods playing slots but will not suit if you are hunting down a big win game. For this, you need a combination of high RTP and high variance. Below are some slots with the highest RTP:

  • Mega Joker: 99%
  • Chess Mate: 98.7%
  • Cinema Classic: 98.5%
  • Lucky mermaid: 98.5%
  • Ways of Fortune: 98.12%

Slots Betting Limits

Slots betting limits will vary depending on the game and online casino. However, every online slots game will have a minimum bet and a maximum bet. This will be a cash amount (i.e. GBP) or a coin amount (a credit that's worth a certain amount). In general, the smallest coin (or cash) amount you'll be able to stake online is £0.01. At the majority of online casinos, the upper spin limit sits between £200-£400 for new or standard players. VIP players who have been long-time customers often get rewarded with higher spin limits that can be customised around their favourite games.

How Many Paylines do Slots Typically Offer?

Pay lines are one of the key features of all slot games and they show you the ways you can win. Online slots have advanced a lot and they now feature a variety of different paylines. This means more chances for you to win but note, each payline requires an extra bet so 50 or more paylines means 50 or more individual bets. You will encounter the below 2 paylines a lot:

243 Ways to Win

  • This format lets players win on a five-reel slot game for any three matching symbols from left to right. This low variance format proved to be a hit with casual players and can now be found on nearly all online slots. Basketball Star and The Dark Knight are examples of 243 ways to win slot games.

Win Both Ways

  • This format breaks from the traditional left-to-right fashion and pays out based on both left-to-right and right-to-left combinations. Sometimes called “2 way pay” slots, they offer more chances to win and are very popular.

How Many Reels Do Slots Typically Offer?

The majority of games you'll find online will be 5-reel slots. However, many of the best slots sites also offer 3-reel slots. 5x reels and 3x rows is a very common format these days. In some instances, you can even find 6-reel slots, though the sixth reel is often a bonus feature that's only unlocked at specific times. Some classic 3-reel slot games are Double Diamond and Super Times Pay while examples of 5-reel games would be Starburst and Cleopatra. Sometimes you get niche slots with unique reel features. An example is the Spartacus Gladiator of Rome online slot which has 2 sets of reels, a 5x4 and a larger 5x12 set of reels.

Reading an Online Slot Payout Table

Modern online slots offer you a variety of ways to win and the payout table shows information on how the slot will pay out its winnings based on symbols, bonus rounds and other possible winning combinations. In general, each symbol will be shown in its own box and the payouts for three, four and five matches will be shown to the left. Some online slots will display the actual cash amount (e.g. three symbols = £2) while others will show a multiplier. If you see a multiplier (i.e. three symbols = 3X), you simply multiply your single line stake by the number shown to calculate your potential winnings.

The payout table is important as it can help you decide which slot you want to play. It will tell you which symbols are high and low paying, which are Scatters, Wilds etc and it may also tell you how many free spins you can get. Some games will have minimum betting requirements, and these will be displayed here. Here is also where you learn how to trigger a bonus as well as finding out how many spins are required for the bigger jackpots. This is also the place where RTP info is stored so paying attention to the payout table makes sense.

History of Slot Machines in the UK

Charles Fey pioneered the slots craze a long time ago with the release of Liberty Bell back in 1899. When this three-reel offering was produced in the US, it started a chain of events that eventually led to slot machines spreading across the world. In the UK, things progressed to the infamous fruit slot machines in the 1980s. Today, taking all the best elements from the past and enhancing them with modern technology, online casino sites are able to offer hundreds of varied games. From three-reel classics to multi-payline progressive jackpot games, players now have more choice than at any other time in the history of slot machines.

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