Best Online Slots UK: Top UK Slots Sites (March 2025)

Our Picks for the Best Slot Sites March 2025

While there are hundreds of slot sites in the UK, our experts, led by Ana Dimitrijevic, have handpicked the best based on key criteria:

Best Slot Sites for Progressive Jackpots

When it comes to huge jackpots, three slot sites stand out for the variety of progressive jackpot games:

Mr Vegas Online Slots

Mr Vegas offers a massive selection of jackpot slots, including WowPot games like the atmospheric Wheel of Wishes and various Mega Moolah titles. They also feature a wide range of Dream Drop progressive slots, with the immersive Temple Tumble 2 a fan favourite.

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

Unibet Online Slots

Unibet hosts over 150 progressive jackpots, featuring popular WowPot titles like the mystical Sisters of Oz and Mega Moolah games such as the charming and quirky Moley Moolah. They also offer a wide range of Dream Drop progressive jackpot slots, including the gritty Wild West-themed Money Train Origins.

Key Features: An incredibly user-friendly slot lobby, plus weekly £10K Lucky Spin Riders tournaments.

BetMGM Online Slots

At BetMGM, you will find WowPot, Mega Moolah, Dream Drop and Jackpot King progressive games, including my personal favourite The Goonies. They also offer exclusive MGM Millions games that include iconic slots such as Starburst, featuring a ‘mega’ progressive jackpot currently exceeding £26 million.

Key Features: Their exclusive MGM Millions games let you play for jackpots on classic slots that don’t offer progressive jackpots elsewhere.

Best Slot Sites for Megaways

Megaways is one of the most popular slot formats, offering countless ways to win with every spin.

Here are our top three picks for the best Megaways slot sites in the UK:

PartyCasino Online Slots

With around 150 Megaways slots, Party offers plenty of choice, including the enchanting Madame Destiny Megaways and playful The Dog House Megaways. Both are also part of Pragmatic Play’s ‘Drops & Wins’ slot promotion, which features random prize drops.

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

Regal Wins Online Slots

Regal Wins is another UK slot site offering around 150 Megaways slots, including classics such as the action-packed Bonanza Megaways and jackpot Megaways slots, such as the iconic Gonzo's Quest Megaways.

Key Features: Daily, weekly and monthly slots promotions, plus loyalty points earned on every spin, redeemable for cash bonuses.

PlayOJO Online Slots

Awarded 'Slots Operator of the Year' in 2023 & 2024, PlayOJO offers over 250 Megaways titles, including jackpot slots like Cash ‘N Riches Wowpot Megaways.

Key Features: The largest selection of UK Megaways slots, plus money back on every spin with 'OJOplus'.

Best Slot Sites for Promotions & Free Spins

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

Here’s what our slot experts consider the best UK slot promotions for March 2025:

LeoVegas Online Slots

At LeoVegas, UK players can claim 50 free spins on the classic Big Bass Splash. They also run regular free spin promotions and competitions for slot players.

Key Features: Exclusive Mini, Minor, Major and Mega jackpots on hundreds of slots with the 'LeoJackpot' badge, with progressive contributions shared across the LeoVegas network.

MrQ Online Slots

MrQ offers 200 free spins on the fun Irish-themed Fishin' Bigger Pots of Gold. These free spins come with no wagering requirements and are only available using the promo code POTS200.

Key Features: The ‘Daily Roulette Drop’ promotion offers free spin prizes to players who deposited £10 the previous week.

Slots Magic Online Slots

New players can claim 50 free spins on Rich Wilde and the Book of Dead. After that, existing players can make a one-time minimum deposit of £50 and get 520 free spins in a year.

Key Features: The exclusive 'Prize Twister' promo, where randomly selected players can win free spins, scratch cards and cash prizes.

New Slot Sites

With new slot sites launching regularly, we highlight the ones that stand out based on key factors like game variety, bonuses and overall player experience:

Mega Riches Online Slots

Mega Riches features a strong lineup of jackpot slots, including timeless classics such as Mega Fortune and Hall of Gods, alongside major progressive series like WowPot, Mega Moolah and Dream Drop. Its varied slot collection also includes 'Drops & Wins' games with daily prize drops and tournaments.

Key Features: A guaranteed cash reward every Friday based on total spins from the past week - the more you bet, the bigger your 'WinBooster'. Plus, any winnings come with no wagering requirements.

Pub Online Slots

Pub offers a varied selection of progressive jackpot games. Their collection includes WowPot and Mega Moolah slots, plus many Jackpot King titles, including the regal King Spin Deluxe Jackpot King, which features exciting bonus rounds and the chance to trigger progressive prizes.

Key Features: Regular slot tournaments where players can compete against each other for cash prizes and bonuses.

Casiku Online Slots

Casiku has over 3,000 slots, including more than 50 Must Go Jackpots games where prizes are guaranteed to drop daily or before reaching a set amount. They also have all the popular progressive jackpot series such as Dream Drop and King Millions.

Key Features: 20 free spins on Rise of Olympus 100 every Tuesday with the 'Turbo Spin Tuesdays' bonus.

How We Rate UK Slot Sites

The best slot sites offer UK slot players sign-up bonuses, including free spins, alongside regular slot promotions and rewards.

They also feature an varied selection of slot games with diverse themes from top software providers, plus the latest releases and biggest jackpots.

When reviewing slot sites, we ensure they are licensed and regulated by the UK Gambling Commission, guaranteeing fair play and security.

Types of Online Slots

The earliest online slots available in the UK were quite simple, typically featuring five reels and three rows. The first online video slot to include a bonus round, Reel 'Em In, was introduced in 1996.

Fast forward nearly two decades, and today's players are met with a new generation of casino slots featuring diverse formats, themes and advanced game mechanics.

Fruit Machine Slots

As the name suggests, these slots are inspired by traditional pub fruit machines. They often feature a retro design, consisting of three or five reels with simple graphics and classic sound effects.

A standout example is Reel King, a beloved fruit machine slot that successfully transitioned from pubs 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 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 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 slots, with popular titles like Wanted Dead or A Wild and Cubes. These 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 slot games 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 (March 2025)

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, 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. 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 slot games 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, £6.2 million on Jackpot Giant and £5.1 million on Beach Life.

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 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 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 slots are:

All of these top 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 (March 2025)

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 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 Slots Online in the UK

To get the most out of your online slot experience, keep these key tips in mind:

1. Understand the Basics: Before you start playing, it’s useful to grasp key slot terms like paylines, reels and symbols. Learn about different slot types, including classic slots, Megaways and progressive jackpots. Also, familiarise yourself with Return to Player (RTP) and Volatility. RTP indicates the percentage a slot returns to players over time, while Volatility determines how frequently and how much a slot is likely to pay out.

2. Choose the Right Slot: With countless slots available, picking the right one can feel overwhelming. The key is to find a game that matches your preferences and playing style. Consider factors like theme, volatility and bonus features to ensure a slot suits your gameplay goals.

3. Make the Most of Free Spins and Bonuses: Most UK slot sites offer free spins and bonuses, giving you extra opportunities to play. These can help you explore different games without immediately risking your own money. However, always check the terms and conditions of any casino bonus, as wagering requirements and other restrictions may apply.

4. Manage your Bankroll: Responsible play is essential. Set a budget for your slot sessions and stick to it. Avoid chasing losses and consider setting time limits to keep your gameplay in check.

5. Play for Fun: While big wins are exciting, they're rare and the real enjoyment comes from the game itself. A slot’s theme, mechanics, artwork and sound effects all contribute to the experience. Keeping entertainment as your priority ensures a more enjoyable time when playing online.

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 online slots offers endless choices, from captivating themes and innovative features to massive jackpots and unique variations like Slingo.

Based on extensive research and player feedback, we’ve highlighted not only the best slot sites but also some of the top online slot games available today.

But don’t just take our word for it. With a wide range of UK online slot bonuses and promotions, you can explore different games and discover your own favourites.

As you enjoy playing, always gamble responsibly. Set sensible limits and only play within your means. Your safety and well-being come first as you explore the best of online slots in the UK.