Best Online Slots UK: Top UK Slots Sites (December 2024)

How We Rate UK Slot Sites

The leading online slot sites in the UK offer enticing sign-up bonuses, including free spins, along with regular slots promotions and rewards to enhance your chances of winning.

They also boast an extensive selection of slots, with diverse and engaging themes from innovative software providers, plus the latest releases and biggest jackpots.

When reviewing online slot sites, we always ensure they are licensed & regulated by the UK Gambling Commission to guarantee fair play and security.

While the responsiveness of customer support and variety of payment options are other key considerations in our evaluation of the best UK slot sites.

Our Picks for the Best Online Slot Sites December 2024

While there are hundreds of online slot sites to choose from in the UK, our experts led by Ana Dimitrijevic have handpicked what they consider the best based upon certain criteria:

Best Slot Sites for Progressive Jackpots

When it comes to massive jackpots, three online slot sites stand out with their extensive offerings of progressive jackpot pool games.

Mr Vegas Online Slots

Mr Vegas offers a huge selection of jackpot slots, with WowPot games like the atmospheric Wheel of Wishes, plus various Mega Moolah jackpot slots. Additionally they feature a large number of Dream Drop progressive slots, with Temple Tumble 2 being our favourite.

Key Features: Three exclusive ‘Wheel of Vegas’ jackpots for slot players and ‘Rainbow Fridays’ weekly cash rewards based on your previous week’s online slots play.

Unibet Online Slots

Unibet has an impressive array of over 100 progressive jackpot slot titles. This includes various popular WowPot slots like Sisters of Oz and Mega Moolah games such as Atlantean Treasures. They also offer an impressive variety of Dream Drop progressive jackpot slots, such as the wild-west themed Money Train Origins.

Key Features: An incredibly user-friendly games lobby, plus weekly £10k ‘Lucky Spin Riders’ tournaments on selected slot games.

BetMGM Online Slots

At BetMGM, you’ll not only find WowPot, Mega Moolah and Dream Drop jackpot slots, but also a selection of Jackpot King progressive jackpot games, such as Funky Pharaoh. They also offer exclusive MGM Millions games including slots favourites such as Starburst and Book of Dead, with a ‘mega’ progressive jackpot currently standing at £22 million.

Key Features: Their exclusive MGM Millions games allow you to play for jackpots on some classic slots which don’t offer progressive jackpots elsewhere. 

Best Slot Sites for Megaways

Megaways is now such a popular online slots format that we have researched slot sites that offer the biggest variety of Megaways games.

Here are the Gambling.com top three picks for the best Megaways slot sites in the UK.

PartyCasino Online Slots

With almost 150 Megaways slots, you are spoilt for choice at PartyCasino, including favourites such as The Dog House Megaways and Madame Destiny Megaways, which are also part of Pragmatic Play’s ‘Drops & Wins’ promotion, with random prize drops every day.

Key Features: Slots players can spin the ‘Party Prizes MEGA Wheel’ for guaranteed daily rewards, plus regular opt-in slots tournaments and prizes.

Regal Wins Online Slots

Regal Wins is another online slot site to offer UK players around 150 Megaways slots, with classics such as Bonanza Megaways and jackpot Megaways slots, such as Diamond Mine Megaways Jackpot King and Wolf Blaze WowPot Megaways.

Key Features: Daily, weekly and monthly slots promotions, plus earn loyalty points every time you play slot games, which you can redeem for cash bonuses.

Mr Vegas Online Slots

Once again, Mr Vegas excels when it comes to their sheer number of slots, with over 200 Megaways titles such as Piggy Riches Megaways, plus jackpot Megaways games like Cash ‘N Riches Wowpot Megaways.

Key Features: The widest range of Megaways slots available in one place in the UK, plus regular slots promotions and a fair sign up bonus that gets paid out in 10% increments as you spin the reels.

Best Slot Sites for Promotions & Free Spins

Many UK slot sites offer customers regular online slots promotions and bonus spins to extend your gameplay or reward loyalty. 

Here we detail what the slot experts at Gambling.com consider to be the best online slot UK promotions for December 2024:

Leo Vegas Online Slots

At Leo Vegas, UK players can get up to 50 free spins on Big Bass Splash (25 spins for your 1st & 2nd deposits) with no wagering requirements. They also offer regular free spins promotions and competitions for online slots players. 

Key Features: There is a ‘Weekly Free Spins’ promo at Leo Vegas, with 30 x 10p free spins on Big Bass Bonanza every Thursday, plus another every Monday-Wednesday, with 10 x 20p free spins offered on Book of Dead.

MrQ Online Slots

Awarded ‘Slot Operator of the Year' in 2021, Mr Q offer slot players 75 free spins on Big Bass Splash, with no wagering requirements, when using our exclusive promo code: SPLASH75. Meanwhile, players of their Pragmatic Play slots such as Sweet Bonanza qualify for the popular ‘Drops & Wins’ promo, with its random daily prize drops.

Key Features: As official sponsors of Watford FC, Mr Q also offers all players 5 free spins on the Wild Swarm slot every time The Hornets win. There is also a ‘Daily Roulette Drop’ promotion which offers free spin prizes to players who have deposited £10 the previous week.

All British Casino Online Slots

Although All British Casino don't offer free spins for signing up, there is a 100% first deposit bonus of up to £100 free and UK slots players also benefit from 10% cashback on lost deposits, paid in real cash with no restrictions.

Key Features: Weekly ‘Marvellous Midweek’ offers, such as bonus spins when reloading, plus they regularly email customers with invites to online slots tournaments and challenges with cash prizes.

Types of Online Slots

The earliest online slots in the UK were quite simple, typically featuring five reels with three rows. The very first online video slot to include a bonus round, known as 'Reel ‘em In’, was introduced in 1996.

Fast forward nearly two decades, and today’s players are greeted with a new generation of casino slots, boasting diverse formats and features.

Fruit Machine Slots

Unsurprisingly, these slots draw inspiration from traditional pub fruit machines. They typically feature a retro style and are composed of either three or five reels, with basic graphics and sounds.

Reel King is a prime example of a traditional fruit machine slot game that has made the successful transition from pub kiosks to online slot sites.

Classic Slots

While NetEnt’s Gonzo’s Quest and Starburst are considered modern-day classics, purists often classify true classic slots as games like IGT’s Da Vinci Diamonds or Barcrest’s Action Bank.

Megaways Online Slots

Megaways slots utilise a dynamic reel system where the number of symbols on each reel changes every spin, resulting in a varying number of win lines.

With up to 117,649 ways to win on a single spin and a cost per spin starting as low as 10p, it's easy to see the appeal of this exciting Megaways mechanic.

Games like Fishin’ Frenzy Megaways and Wild Celebrity Bus Megaways demonstrate how this innovative feature can be integrated into popular online slots.

Slingo

A blend of slots and bingo, Slingo offers a unique gaming experience where players complete bingo-style grids with numbers spun on a slot reel.

The goal is to match numbers to complete winning lines ('slingos') and advance up the prize ladder towards a full-house and the top prize.

If that’s your thing, we recommend checking out the wide selection of Slingo games at All British Casino.

High Volatility Online Slots

Nowadays, software developers are eager to create highly volatile slots, providing players with the opportunity for larger but less frequent wins.

Hacksaw Gaming, in particular, are renowned for their extremely volatile online slot games, with titles like Wanted Dead or A Wild and Cubes. These online slots offer a truly all-or-nothing experience, emphasising a high-risk, high-reward style of gameplay.

Maximum Win Online Slots

Many seasoned slot players have yet to hit ‘max win’ on one of the highest paying slots.

NetEnt were the first to break the 100k barrier with their Dead or Alive 2 offering a maximum pay-out of 111,111x your stake, later surpassing it with the release of Starburst XXXtreme at 200,000x. 

However, Nolimit City's Tombstone RIP now tops the charts with an unprecedented 300,000x max payout, first hit soon after its release in 2022.

Such potential wins are among the reasons why Nolimit City slots have secured a place in the favourite online slots lists of many UK players.

Progressive Jackpot Slots

Progressive jackpot slots offer the chance for someone to win a substantial fortune, with each bet contributing a small portion to a continually growing jackpot.

There are various progressive jackpot pools that link games from the same software provider and keep increasing until one player lands the jackpot.

Once won, the jackpot returns to a seed value and begins increasing again.

Below, we detail the largest online slot network jackpots currently available, along with the best UK slot sites where you can play them.

Network Progressive Jackpot Tracker (December 2024)

The biggest online progressive jackpot payouts have mostly been won on the WowPot and Mega Moolah series of slot games.

Microgaming launched the safari-themed Mega Moolah progressive jackpot slot back in 2006 to much acclaim. In 2015, it paid out a £13.2 million jackpot to British soldier Jonathan Heywood at Betway from the minimum 25p stake.

Since its release, the game has expanded into a series of titles that all feed into the same jackpot, such as Absolootly Mad, which paid the largest Mega Moolah jackpot of £16.9 million in April 2021.

That huge win came just two weeks after a WowPot jackpot of £15.2 million won by a UK slots player on the Book of Atem online slot at 32Red. Watch:

However, WowPot regained its crown with a world-record online slots jackpot of £33 million, won in late 2023 on the aptly named Wheel of Wishes.
 

While the slots above contribute to shared network jackpot pools, the following are stand-alone games with their own progressive jackpots:

These individual slots can still pay out staggering jackpots, including the €17.9 million won on Mega Fortune by a Finnish player.

UK players have won jackpots of £6.3 million on Hall of Gods at Casumo, £6.2 million on Jackpot Giant at Gala Bingo and £5.1 million on Beach Life at Betfred.

Daily Jackpots 

While the big progressive jackpots can take weeks or even months to drop, there are also jackpot slots that are guaranteed to pay out every day.

Sometimes called ‘Daily Drop,’ ‘Must Drop,’ 'Must Go,' or ‘Must Win,’ these progressive daily jackpots ensure a big winner every 24 hours

At some top slots sites such as TalkSPORT BET and PlayOJO, you can watch the countdown of when the daily jackpot ‘must drop’ in their games lobby and play just before the jackpot time limit is up.

Here are some of our favourite daily jackpot slots:

Online Slot Themes

There’s an endless variety of online slot game themes to choose from at the best online casinos, catering to all preferences. Below we've categorised the most popular themes and shared our personal favourites from each.

Animal Slots 

The world of animal-themed online slots can transport you to the North American plains, Amazonian jungles, the depths of the ocean, or simply feature your favourite pets.

Our Top Picks:

Both of these animal slots are available to play in the UK at: bwin Casino & BetMGM

Movie Slots

Blueprint Gaming and Microgaming lead the way for movie slots and this category could easily include another six or so exceptional games, but we've whittled it down to our three favourites.

Our Top Picks:
 

All three of these movie slots are available to play in the UK at: Betway & PartyCasino

TV Slots

There are also numerous excellent slots based on popular TV shows, which offer fans an interactive way to immerse themselves in their favourite characters and themes.

Our Top Picks:

Each of these TV series-inspired slots can be enjoyed in the UK at: Pub Casino & Fun Casino

Lucky Irish Slots

There’s zero chance we could leave Lucky Irish themed slots off this list. Such is its popularity, for some players there simply are no other types of online slots. 

Our Top Picks:

You can chance your luck on either of these Irish-themed slots in the UK at: PartyCasino & Mr Vegas

Mythology Slots

There are probably more online slots based around mythology than any other genre - players will never tire of these mythological slots and game providers regularly release new versions.

Our Top Picks:

Both of Ana's expert recommended mythological slots are available to play in the UK at: Betway & PartyCasino

Ancient Egypt Slots

New releases of Ancient Egyptian themed slots often share common characteristics, including expanding reels, the potential to retrigger bonuses and opportunities to gamble each win.

Our Top Picks:

You can play all three of these highly recommended Ancient Egyptian slots in the UK at: Kwiff & BetItOn

Fruit Slots

The traditional ‘fruit machines’, named for their reel symbols of grapes, plums, oranges, lemons, bananas, melons and cherries, have long been a staple in local pubs. Thus, it's no surprise that online slot developers sought to capture the essence of the pub ‘fruity’.

Our Top Picks:

All three of these must try fruit slots are available to play in the UK at: Pub Casino & All British Casino

Pirate Slots

Although not at the top of our favourite themes for the slots team at Gambling.com, there are a few excellently executed pirate themed slots bobbing around the lobby of many online slot sites in the UK.

Our Top Picks:

Both of these pirate slots can be played in the UK at: Mr Vegas & PartyCasino

Other Top Online Slots

Whilst those are the most common themes for online slots, UK players have endless options - from Dinosaurs to Dragons, Sci-Fi to Sweets or Vampires to Vikings. No matter your preference, there is almost certainly an online slot themed around it. 

A few others that rank among the all-time favourite online slots are:

All of these top online slots can be played in the UK at: Mr Vegas & MrQ

Online Slot Mechanics & Features

Whilst the basic concept of most online slots is the same, many offer a unique mix of game mechanics and features that impact gameplay and potential winnings.

Here our slots experts summarise of the main characteristics of online slot games: 

Base Game

When you fire up any online slot, the first thing you’re presented with is the base game which offers the standard reel configuration and symbols for that particular slot. 

A quick dip into the information section and you’ll find the paytable which displays the value of each symbol and the payouts for winning combinations. The base game is usually straightforward and you just need to choose your bet size and start spinning. 

The bet size, also known as the spin value, allows you to customise your play and tailor wagers to suit your budget. The way it is calculated can vary for different slot games, but typically includes the following elements:

• Coin Value: Your coin denomination, often starting from just £0.01
• Bet Level: This determines the number of coins you wager per spin 
• Paylines: Some slots also allow you to choose how many paylines you wish to activate

Most slots require a minimum of three matching symbols to create a win, although some slots pay for matching just two of the highest-value symbols. 

Traditionally, winning combinations are formed by matching symbols on adjacent reels, with the default being left to right although innovation has brought us a number of interesting payout structures, including:

• Pays Both Ways: Wins paid for combinations from left to right and right to left.
• Cluster Pays: Wins occur when enough matching symbols (usually 5-7) form a cluster, regardless of their reel or position.
• Anywhere Pays: Similar to Cluster Pays, but the matching symbols can be located in any position, on any reel within the game screen.
• Scatters: Also referred to as Bonus symbols, usually landing three scatter symbols (in any position, on any reel) will trigger the bonus game. Some slots offer an enhanced bonus game when landing four or more scatters.
• Wilds: These prized reel symbols will substitute for any other symbol (except Scatters or bonus symbols) to form winning combinations.

Bonus Rounds

While the base game creates more frequent and occasional big payouts, it’s the bonus round that unlocks the premium symbols with the largest multipliers for the biggest wins. 

The bonus round is usually triggered when three or more Scatter symbols are landed, which then awards free spins along with enhanced features and multipliers, such as:

• Expanding Reels: Landing a nominated symbol (in any position, on any reel) will expand that symbol to cover all positions on that reel, creating more chances of a winning combination, for example with Book of Dead at PriveWin.
• Retriggers: Landing additional scatter symbols during a bonus round can award additional free spins. Danger High Voltage is a great example of a slot where a retrigger can bring huge wins due to an incremental multiplier.
• Jackpot Wheels: Spin the jackpot wheel to see which bonus round you’re awarded. Slots such as Sausage Party and Genie Jackpots - both available at BetMGM - have six or seven different bonus rounds available. 
• Bonus Gambles: Don’t like the bonus feature awarded? Games such as Extra Chilli and Vikings Unleashed offer you the opportunity to gamble your bonus for a bigger bonus - or lose it all! You can try both of these slots at MrQ.
• Upgrade Symbols: Some bonus rounds will eliminate lower paying symbols or upgrade the selected symbol when you land a particular combination. This feature enhances your chances of bigger wins, for example with Fishin’ Frenzy: The Big Catch at Neptune Play.
• Ladder/Trail: Collect certain symbols during a bonus round to climb the ladder or progress along the trail for bigger rewards. For a great example of this in action, check out Big Bass Bonanza with 125 free spins at Betway.
• Link & Win: A respin feature developed by Microgaming (known as Lock 'n Spin or Hold & Spin on other slots software). You are awarded three spins that reset with each cash symbol that lands, until you run out of spins or there are no more cash bonuses to collect. For example, try out Cairo Link&Win at PartyCasino.

Online Slots Tournaments UK (December 2024)

Slots tournaments add a competitive edge to spinning the reels, with additional rewards above and beyond regular slots gameplay.

In these scheduled tournaments, players compete against each other to win cash prizes or other rewards.

While each slots tournament has its own rules, the goal is always to accumulate points to rise up the leaderboard.

Here we list the tournaments currently available at UK slot sites:

The most popular online slots tournaments in the UK are Drops & Wins, available exclusively on Pragmatic Play slots games.

With a monthly prize pool of £2 million, this promotion offers prize-paying positions on weekly tournament leaderboards, plus random daily prize drops:

£255,000 for weekly leaderboards x 4 weeks = £1,020,000

£35,000 in daily prize drops x 7 days a week x 4 weeks = £980,000

Our UK slots team especially like the random daily prize drops which give everyone who plays a chance to win, not just those who make it onto the weekly leaderboard.

Top 5 Tips for Playing Online Slots UK

For beginners and seasoned players alike, playing online slots can be an exciting and potentially lucrative pastime. To maximise your enjoyment and improve your chances of winning, here are some key strategies and tips to consider:

1. Understand the Basics: It's good to grasp the basics before you start playing. Understand what paylines, reels and symbols mean. Learn about different types of slots – classic, Megaways, progressive jackpots and more. Also, get familiar with terms like Return to Player (RTP) and Volatility. RTP refers to the percentage of all wagered money a slot machine will pay back to players over time, and Volatility relates to the risk level associated with a particular slot game.

2. Choose the Right Slot: With the vast array of UK slots available, selecting the right one can seem daunting. The key is to find a slot that fits your preferences and playing style. Consider factors like theme, volatility and bonus round options.

3. Utilise Free Spins and Bonuses: Most online slots UK sites offer free spins, bonuses and promotions. These can be a great way to try out a game before risking real money, or to extend your playtime. Always read the terms and conditions associated with any casino bonus, as there can be wagering requirements or other restrictions.

4. Manage your Bankroll: Responsible gaming involves setting a budget for your online slot play and sticking to it. Never wager more than you can afford to lose and consider setting a time limit for your play sessions to prevent getting carried away.

5. Keep it Fun: While we all enjoy daydreaming of spinning a huge payout, I personally rate a slot according to its theme, game mechanics, artwork and the quality of the sound effects - elements that truly enrich the experience of playing slots online. Remember, the primary goal of playing slots is entertainment. Keeping this perspective can help make your online gaming experience more enjoyable.

UK Slots Regulations

Recent changes to UK slot regulations were introduced by the UK Gambling Commission (UKGC) to promote responsible gambling among online slot players.

They included the elimination of features that could speed up play or give the illusion of control over the outcome. 

Quick Spin and Auto-Play features are no longer permitted, aimed at ensuring slots players stayed engaged and mindful of their spending on each spin.

The UKGC also now prohibits Bonus Buy-ins or Feature Buys for UK slots players. These options allowed players to purchase immediate access to a game's bonus features, potentially encouraging excessive spending. 

The goal behind eliminating these features is to reduce the risk of slots players losing money quickly and impulsively. When playing online slots, UK players are encouraged to do so responsibly and within their means.

Best Online Slot Sites UK – Our Verdict

The world of UK online slots offers an endless array of choices. You’ll discover games with captivating themes, innovative features and diverse formats, plus massive jackpots and fun variations like Slingo.

All the UK slot sites Ana and the team at Gambling.com have recommended on this page provide players a broad selection of real-money slots within a safe and secure environment.

Based on extensive research and player feedback, we have highlighted not only what we consider to be the best slot sites, but also the best online slots games available today.

But don’t just take our word for it. There are a huge variety of UK online slots bonuses and promotions that enable you to trial different online slots and find your own favourites.

As you embark on this exciting journey, it is crucial to always play slots responsibly. Set sensible limits for yourself and always gamble within your means. Your safety and well-being are paramount as you explore the best of what online slots in the UK have to offer.