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Where to Play Online Slots: Casinos With the Best Slot Games

Here is our quick guide to the UK’s most popular online slots (with high ROI and free spins bonus games) and casinos to play. You will explore different types of slot machines (fruit classic with fruits to progressive videoslots with jackpots). Read further and learn about best casino sites to play slot games for real money with free spins promotions in 2021/2022.

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  • Bet365
    5.0 rating based on 1 rating
    Bet365 Casino Bonus: £25
    Bet365 offers new casino customers up to £25 in bonus funds. Use bonus code ‘Casino New Player’ when registering an account with bet365 Casino, make a deposit of £10 or more, and bet365 will match the figure up to maximum of £25. Players must wager the amount of the qualifying deposit and bonus 20 times on eligible games before they can withdraw any bonus funds and winnings. Any bonus funds accumulated will be removed if the wagering requirement has not been met within 30 days of the qualifying deposit. Customers must be 18 or over. Full terms and conditions apply. Please gamble responsibly. Read More
  • William Hill
    5.0 rating based on 1 rating
    100% Buy in Bonus + 50 Free Spins
    18+. Play Safe. Opt in required. New customers to Casino page only. 1x per customer. Min. Buy in £10. Bonus value 100% of Buy in. Max. Bonus £300. 40x Wagering, Max Redeemable £4,000. 50 Free Spins with x35 wagering will be awarded after the Buy in Bonus is completed, Max Redeemable £1000. Bonus expires after 7 days. Stake contributions, player, country, currency, game restrictions and terms apply. Read More
  • Betfair
    5.0 rating based on 1 rating
    Sign up with code to get free spins
    New customers 18+ who have not played casino only, using registration code CASF51. UK/IRE Customers Only. You must visit the Casino promotions hub and accept the promotion, deposit and Bet a minimum of £10 on Daily Jackpot Games. E-Wallet Deposits not valid. Once you have completed the qualifying requirements you will be awarded your selected free spins automatically. The winnings from your free spins hold no further wagering requirements. Read More
  • Matchbook
    4.3 rating based on 1 rating
    Sign up for a Matchbook casino account, play hundreds of games
    Terms: New Customers only, 18+ UK. This promotion is available to new customers only, who register using the promo code “Matchbook15” or “Insights15”. New customers who create an account using the correct bonus code can place their first bet of £10 or more at odds of 1.8 or more on any market on Matchbook. After your bet settles, Matchbook will match your stake in bonus funds to your Matchbook account up to a maximum of £10. Read More
  • Ladbrokes
    5.0 rating based on 1 rating
    Bet £10, Get £50 Bonus
    18+. New Casino players only. Deposit required. Bet £10+ on qualifying games. 40x wager reqs (bonus only) on selected games. Accept Bonus within 14 days. Bonus valid for 30 days. Certain deposit types excluded. Player restrictions and T&Cs Apply. Read More
  • Coral
    5.0 rating based on 1 rating
    £50 Welcome Bonus for New Customers
    New Coral Casino customers will get £50 in bonus funds following their first deposit. All you need to do is create an account, wager £10 or more on eligible slots, casino or live casino games, and £50 will be credited to your account. The casino bonus is subject to a wagering requirement of 40 times before customers can withdraw any funds, which will expire if not withdrawn within 30 days of issue. Customers must be 18 or over. Full terms and conditions apply. Please gamble responsibly. Read More

There is generally a big selection of slots to choose from at online casinos. These are simple games that often present features such as free spins and bonus rounds, with many different themes. Try Spin and Win casino and play Novomatic games like Book of Ra or NetEnt videoslots like Starburst with free spins bonus games, or register for a Betregal casino account and get access to one of the biggest collection of online slots, including progressive jackpot games like Mega Moolah.

Top slots developers like Playtech, Microsoft, and NetEnt all have their games available here, with Evolution providing lots of the live dealer games you will see. This selection is alongside their individual collection of table games and slots, meaning that you can choose from their numerous classic titles as well as new releases. On some of the best UK online casinos, you can filter the games by developer, to find a certain company’s full selection.

Hugely popular slots are available on many of the best online UK casino sites and via apps, giving you a variety of features, progressive jackpots, and fascinating themes (sports, erotic, fruits, classic, adventure and more).

A few of the best slots you will discover on UK casino sites:

  • Rainbow Riches is an Irish-themed slot from SG Digital. It includes a variety of bonus games that give the chance to win the game’s biggest wins. This videoslot is available in different versions at several casino sites like Betfred, such as one that includes the Megaways engine with up to 117,649 different ways to win. 
  • Twin Spin online slot from NetEnt is a classic-looking slot game that has two major features. Wilds help you to complete winning combos, while the Twin Reel feature links adjacent reels to also increase the chances of a win. Try William Hill games or bet365 slots.
  • Immortal Romance slot is a vampire-based, gothic slot from Microgaming. It provides the chance to win free spins, a Wild Desire bonus feature, and 243 ways to win.   
  • Book of Dead is a classic Egyptian adventure slot from Play n´Go that sees you exploring tombs in your search for treasure. Free spins and expanding symbols make it a firm favourite on most of the UK’s best online casino apps and desktop-based sites.

Online Casinos with Best Slots & Offers

  1. VirginGames Slots: Play with 30 free spins
  2. GrosvenorcasinosUK Slots & Games: £50 deposit bonus
  3. NetBet Casino Slots: 500 free spins, bonus code NBWelcome500
  4. Coral Casino: Online Slots + Jackpots
  5. 40 free spins on selected slot games

The top UK casinos with online slot games offer special bonuses like free spins. To claim a sign up bonus for online slots you have to open account with one of the top-rated casinos and make a first deposit. You’ll receive some free spins to play on selected slot games of your choice. Online casino Virgin Games offers 30 free spins for selected slots to get you started. If you win any money, you’ll have to wager it several times over before it is released.

Online slots at Virgin Games with free spins promo
Online slots at Virgin Games with free spins promo

You can also claim a deposit match bonus. For example, the Grosvenorcasinos UK rewards new customers with 50 deposit bonus. Make a first deposit after sign-up and get it matched 100% with bonus funds. Play eligible slots within the deadline and meet the wagering requirements in order to clear the funds.

You can get free bets to play slots. For example, BetVictor online casino offers a £10 free spins bonus when you deposit and bet at least £5. Wager is x20.

· 100,000 Pyramid
· 300 Shields Extreme
· Astro Cat Deluxe Online Slot
· Baking Bonanza Slot
· Berryburst Max
· Big 500 Slot
· Book of Ra Deluxe 6
· Book of Ra Magic
· Captain Venture
· Cash Hound
· Cazino Zeppelin
· Cosmic Fortune Online Spins
· Couch Potato
· Danger High Voltage
· Dead or Alive 2
· Devils Delight
· Diamond Empire
· Dolphins Pearl Deluxe
· Dragon Castle
· Dragon’s Treasure
· Egyptian Rise
· Eternal Fortune
· Excalibur’s Choice
· Fortunes of Ra
· Geisha Wonders
· Gift Shop
· Gods of Olympus Megaways
· Gold Cup
· Grand Spinn
· Gun Slinger Fully Loaded
· Halloween Jack
· Hansel & Gretel Treasure Trail
· Icy Wonders
· Immortal Guild
· Irish Luck Slot Game
· It Came From The Moon
· Jammin’ Jars
· Jokerizer
· King of the Jungle
· Legend of the Pharaohs
· Lightning Strike Megaways
· Lord of the Ocean Spins
· Lucky Lady’s Charm Deluxe
· Lucky Tiger
· Magic Merlin Megaways
· Medusa II Spins
· Meet the Meerkats
· Monopoly Grand Hotel
· Mystery Spin Deluxe Megaways
· Neon Jungle
· Nuts Commander
· Pacific Paradise
· Pamplona
· Panda Gold Scratchcard
· Pharaoh Bingo
· Pirate’s Gold
· Power Force Villains
· Primal Megaways
· Queen of Riches
· Rainbow Riches Megaways
· Razor Shark
· Red Hot Win Spin
· Return of Kong Megaways
· Riches of Ra
· Slingo Xxxtreme
· Speed Cash
· Star Trek Against All Odds
· Star Wilds Hot Spins +
· Stone to Gold
· Super Eight Slot
· Super Fruits Joker Slots
· Super Lucky Frog Spins

So, where to play online slots?

The best casinos for online slots are: bet365, BetVictor, William Hill UK casino, Grosvenorcasinos, Unibet and new gaming sites with slots for real money such as:

  1. Rainbow Riches Casino
  2. NY Spins Casino
  3. Paddy Power Games
  4. Rizk Casino UK
  5. Slots Heaven 
  6. Spin Rider Casino
  7. Monopoly Casino
  8. Regent Casino
  9. Mr Green Casino
  10. Mr Mega
  11. Spin Rio Slots
  12. Megaways casino
  13. 777 casino
  14. Casushi casino
Online Casinos Offering Slots With Free Spins Bonus
Online Casinos Offering Slots With Free Spins Bonus

Top Slot Games

SlotsRTP*Game Provider
Book of Ra deluxe slot94.26%Greentube
The Great Gambini’s Night Magic95.02%Greentube
Rainbow Riches95.00%Scientific Games
Diamond Link™: Mighty Elephant95.00%Greentube
*RTP of these lots based on information.

The best online slots sites in the UK offer hundreds of games at a range of juicy stakes. Get some practice in with free slots or gamble real money and take down the jackpot! You can even claim a casino bonus like free spins when you make your first deposit.

Online games are totally legal in the UK. Find the best titles from UK-licensed developers like NetEnt, Microgaming, and Play’n GO. Play classic slots or shoot for the moon and win a progressive jackpot.

Types of Online Slots

The online slots operate similarly to the classic physical slot machines, but they are available via online casino site or mobile app. The best UK online casinos boast a huge array of different variations and game types. Take your pick of fruit machine-style games or load up the latest HD 5-reel game bursting with bonus action.

  • Classic Slot/Fruit Machine: Play classic slots at bet365 UK casino, these games look a little different than UK fruit machines. However, the gameplay is often quite similar. In a classic slot, you play with 3 reels and usually just one or two paylines. They may not be a bonus feature and the symbols have a retro vibe. You’ll have to line up fruit, gold bells or BAR symbols to win a prize. You can also play online fruit slots. These closely resemble the types of fruit machine you’ll find in UK amusement arcades and clubs. Play 3 reels and win by making three-of-a-kind. You can also use the nudge and hold features to improve your chances of a win. Plus, many online fruit slot machines feature the trail bonus. Try William Hill casino, get free spins. Light up the trail and trigger bonuses like Hi-Lo, free spins, or even a jackpot. 
  • Video Slot: Most online slots can be classed as video slots. These casino games tend to have 5 reels or more and many paylines to hit. You can also trigger a bonus round like free spins if you hit the required number of scatters on the reels. Bonuses for UK slot players vary from slot to slot. However, common bonus games for real money include free spins or a wheel of fortune. Plus, the best video slots come equipped with HD animation and immersive sound effects for a great experience all-round. Try bet365 casino slots by NetEnt or some of the new casino sites or mobile gambling apps.
  • Progressive Online Slots: You’ll find lots of progressive slots at the top UK online casinos. A progressive slot features a special jackpot that you can win by triggering a unique bonus feature. Progressives tend to grow the longer they go unclaimed. Tiny portions of each bet contribute to the jackpot. When the jackpot is claimed, it will reset for the next batch of players. You can go to, sign up and get free spins to play online slots with progressive real money jackpots already now. 18+, UK. Terms

How to Play Online Slots

All good online casinos in the UK offer slots games. Take your pick from classic fruit machines offering a single payline or new multiway slots with thousands of ways to win.

In an online slot, you pay money to spin a set of vertical reels. You’ll win a cash prize by matching symbols across ‘paylines’ which run from left to right across the screen. The number of paylines can vary from game to game.

In addition, top online slots offer special bonus features which you can trigger during the game. Bonuses vary but can include a set of free spins, wild symbols, or a random paid jackpot.

It’s easy to get started. Open the UK casino lobby and click on the slots tab to bring up the list of games. You’ll have the option of playing with free credits or your bankroll. Winnings are paid out instantly and you’re free to exit the game whenever you like.

The best UK casinos where you can play online slots offer a vast array of exciting games to play. It can be hard to find the games you want if you don’t do some research first. We recommend Unibet casino, VirginiGames, bet365, Mr Play casino and other sites that offer welcome bonus codes, coupons and free spins.

A good rule of thumb is to try free-play slots first. Load up the ‘Practice Play’ version of the game in your browser or on your mobile phone. You’ll be given a number of free credits by the casino to use on the game. There’s no financial risk, but you won’t win any actual cash.

By trying freeplay slots, you can decide which games you want to play for real money. Get a feel for a game’s variance and see if the bonus features are easy to trigger.

Online Slots and Games
Popular Slots and Games

UK casino players can now enjoy thousands of the most exciting and famous online slots. Play for free or real money at licenced casino websites and via gambling apps regulated here by the UK Gambling Commission. You can enjoy classic online fruit machines or spin for the chance of triggering free spins or a progressive jackpot.

Starburst Online Slot

NetEnt’s classic Starburst is a 10-line game with low volatility and an RTP of 96.10%. In this space-themed slot, you must line up shining gems to win payouts. But the Starburst Wilds are the real stars here. These wilds appear on the middle 3 reels only. When they appear, they will expand to fill the whole reel. They will then hold in place while the other reels re-spin. Play Starburst at Mr Green Casino App.

Gonzo’s Quest Slot

Gonzo’s Quest is an Aztec-themed slot that introduces the Avalanche feature to players. Every time you land a winning combination, it will explode from view. The winning symbols then disappear and allow the ones above to drop into their place. And with every successful avalanche, a progressive multiplier will be added to your win. Play Gonzo’s Quest at Ladbrokes Casino with a free spin promo.

Divine Fortune Slot Game

Divine Fortune is one of NetEnt’s most popular jackpot slots. The Greek myth-themed slot has 20 paylines and an RTP of 96.6%. You can also trigger a free spins bonus, or the Wild on Wild feature with special Overlay Wilds. Divine Fortune online slot also features a progressive jackpot. Trigger the Jackpot Bonus game and fill rows with special symbols to win the corresponding jackpot. Play Divine Fortune at Coral Casino.

Secret of the Stones

Secret of the Stones is a magical slot from NetEnt set around Stonehenge. It has an RTP of 96.72% and features a great free spins bonus where you can enjoy several modifiers. Hitting 3+ scatters will activate the free spins round. Select from 20 sacred stones to reveal a number of free games. You can also trigger additional free spins, 1x or x2 multipliers, or wild reels where an entire reel becomes wild. Play the Secret of the Stones slot at Matchbook Online Casino with bonus on first deposit.

Mega Fortune Online Slot

Mega Fortune is one of NetEnt’s most popular progressive slots. It has a millionaire theme and an RTP of 96.6%. The game has 25 paylines, wilds, and a free spins bonus feature. Plus, you can win one of three progressive jackpots by activating the Wheel of Luck bonus. Play Mega Fortune today at Betfair Casino.

Slot Games Developers

Under current gambling laws, online casino producers must be licenced in the United Kingdom if they want to provide slots here. That means you can be sure that every legal casino slot you play has been independently tested. Random number generators (RNGs) have been audited and return-to-player percentages (RTP) have been independently verified by approved testing bodies. In the UK you can enjoy popular online slots from some of the biggest developers on the planet.

Here are three of the biggest and best slot games developers:

  • NetEnt
  • Microgaming
  • Playtech

NetEnt Online Slots, Casino Sites & Games

NetEnt casino games
NetEnt casino games

NetEnt is a Scandinavian game producer which provides top slots and table games to the biggest online casinos in the UK. It began life as a producer of land-based slot machines but migrated to online casino games in the late 1990s. You can now play hundreds of NetEnt slots online and through your mobile phone. Sign up with one of the best slot casinos and claim your free spins bonus.

Top Netent online slots casinos with free spins:

  • Kassu
  • PartyCasino
  • PokerStars Casino

Popular NetEnt top games include:

  • Starburst, including new XXXtreme version
  • Gonzo’s Quest Slot
  • Divine Fortune
  • Secret of the Stones
  • Asgardian Stones
  • Motorhead
  • Mega Fortune

Microgaming Slots, Games & Online Casinos

Microgaming slots and casinos
Microgaming slots and casinos

Microgaming began life on the Isle of Man and launched the first online casino games in the mid-90s. Since then, Microgaming has produced hundreds of online slot games, including classic titles like Cash Splash and big-money progressives like Mega Moolah. They are also behind some innovative slot features, such as 243 ways to win. Register an account with one of the best Microgaming casinos and get free spins bonus to play slots online.

Which casinos have Microgaming slots in UK:

  • AdmiralCasino
  • NetBet Casino
  • Unibet UK Slots

Top Microgaming slot games include:

  • Jurassic Park
  • Playboy
  • Immortal Romance
  • Mega Moolah
  • Terminator 2
  • Thunderstruck II

Playtech Slots, Games & Top Casinos

PlayTech casino and slots
PlayTech casino and slots

Israeli gambling giants, Playtech, have been producing slots and table games since 1999. They now provide online slots in the UK and across 20 jurisdictions. Playtech is known for its branded slots like Frankie Dettori’s Magic Seven and its excellent range of progressive jackpot slots. The Age of the Gods progressive slots are hugely popular with UK gamblers and regularly pay out 5 and 6-figure jackpots. Select the best Netent casino site to play slot games with a massive welcome bonus and free spins.

Where to play Playtech slot games for real money in the UK:

  • bet365
  • William Hill Casino
  • Unibet Casino
  • VirginGames Slots

Top Playtech slots include:

  • Age of the Gods
  • Age of the Gods: Furious 4
  • Frankie Dettori’s Magic Seven
  • Golden Tour
  • A Night Out
  • Top Trumps Football Legends
  • Halloween Fortune
What is Volatility & RTP in online casino slots?

Every slot has volatility. It’s the frequency with which a game pays out jackpots or triggers bonuses. High-volatility slots may pay out large jackpots but they’ll come infrequently. Low-volatility slots will tend to pay lots of smaller prizes, but bonus features may be small or non-existent.
The RTP is the return-to-player percentage. You’ll usually find this information in the slot’s paytable. It relates to the expected return made to players over millions of spins. The higher the RTP, the better the average payouts are for players.

What are the most popular slot games?

Some of the most famous slots to play online (among British casino gamblers) are: Immortal Romance, Lucky Lady’s Charm slot, the Book of Ra game series, Sizzling Hot, Starburst and Age of the Gods.

Best casino apps to play slots?

All UK’s top slot casinos offer mobile apps. Download for free and install on your iOS and Android smartphones one of the best casino apps in the UK. Play slots with William Hill or bet365 mobile casino apps.

Find the Best Progressive Slots Casinos

CasinoBonusFree Spins
Sky VegasSpend £10, Get 200 Spins50 No-Deposit Free Spins
Slots Million100% up to £20100 Free Spins
LeoVegas100% up to £10010 No-Deposit Free Spins
Mr Green100% up to £100100 Free Spins
Bet365100% up to £100n/a

What is a Progressive Slot?

Progressive jackpots offer slots players the chance to win millions of pounds on a single spin. Progressives are 100% legal in the UK and the best online casinos offer a great range to play for real money. Discover why progressive slots are loved by UK gamblers in 2021. We’ll even show you which great casinos offer big progressives and bonuses.

Regular online slots usually carry a fixed jackpot which you can win through hitting 5-of-a-kind or a bonus feature. Progressive slots are different – they carry a jackpot which keeps climbing until one player takes it down.

Progressive slots are normally linked across multiple online casinos. Every time you play, a tiny fraction of your stake is added to the jackpot pool. The remainder goes towards playing the slot itself. The more casinos that share a game, the bigger the jackpot gets. Plus, some progressive jackpot slots share the same prizepool.

  • Standalone Progressive Slots: A standalone progressive is a single slot that offers an exclusive jackpot. You’ll have to play that slot at a particular casino for a chance of winning the big one.
  • Progressive Slots Series: Some developers offer a series of progressive slots that all share a single jackpot. In games like Playtech’s Age of the Gods series, you can win one of four separate jackpots depending on how the bonus game pans out.

Popular online slots series include:

  • Age of the Gods Mystery Jackpot (Playtech)
    Games include: Age of the Gods, Age of the Gods Medusa & Monsters, Age of the Gods Epic Troy
  • PowerPlay Jackpot (Playtech)
    Slots include: Book of Kings PowerPlay Jackpot, Blazing Bells PowerPlay Jackpot, Storms of Ice PowerPlay Jackpot
  • DC Super Heroes (Playtech)
    Games include: Justice League, Batman and Catwoman Cash, Superman

How to Win a Progressive Jackpot

Progressive slots award jackpots in different ways. Typically, you’ll have to trigger a bonus feature first in order to take down one of the game’s jackpots. A tiny percentage of each spin goes towards building the jackpot. This is normally around 0.99-1% of the total stake. To start playing slots, sign p for an account first:

  1. Go to William Hill Casino site to register
  2. Use promo code to claim sign-up bonus
  3. Deposit, go to jackpot slots section to start playing

The bonus feature is usually triggered at random during any base game spin. Alternatively, you may have to land scatter symbols in certain positions. As long as you are playing for real money, you’ll be able to activate the jackpot game. However, some games require you to bet at the maximum stake in order to qualify.

The bonus feature differs from game to game. It might involve a pick’em style game where you have to match symbols on the screen. Simply reveal matching symbols to win the corresponding progressive jackpot. Games like Microgaming’s record-breaking Mega Moolah use a wheel bonus where you have to line up arrows to win one of the game’s jackpots.

Top 5 Biggest Online Jackpots of All Time

Slots with jackpots are hugely popular at UK online casinos. In fact, British gamblers have been winning 5 and 6-figure jackpots for the past few years. Here are some of the largest online progressive jackpots ever taken down.

  • Mega Moolah (€18,915,721)
    Won: September 2018
  • Mega Moolah ($20,057,734)
    Won: January 2019
  • Mega Fortune (€17,860,868)
    Won: January 2013
  • Mega Moolah ($16,496,060)
    Won: April 2020
  • Mega Moolah ($13,615,861)
    Won: May 2020

As a slots player, you can claim some great casino bonuses. A gambling bonus gives you an opportunity to earn free spins on big-name slots or claim free cash from the casino. All you need to do is complete your registration form and make a first deposit. You’ll be awarded free spins to use on selected slots. However, some casinos also award no-deposit bonuses where you can play progressive slots with zero risk. As long as you meet the wagering requirements, you’ll have a chance to unlock free money.

Due to their volatile nature and massive jackpots, not all progressives will be eligible for a casino bonus. Always check the casino’s terms and conditions page first to see which online slots are exempt from the bonus.