The UK's Best Online Slots Casinos for 2021
Enjoy fantastic fruit machines at top-rated British casinos
With enormous prizes and uncomplicated gameplay, it's obvious why real money and free slots are so popular. While it's fun to play in pubs or at your local casino, nothing beats the action at a top online slots casino.
Our online casino UK specialists have vetted and tested more than a hundred licensed sites for you to safely play all the best slots machine games at.
All the UK casino sites on this page have:
- 100s of classic online slot machines, video slots, and more
- The biggest progressive jackpots
- An enormous free welcome bonus when you sign up
The UK's Top Games & Bonuses for September 2021
Free Games
View Full Library of Free Games1050 Games Match Your Preferences
Mansion
Ranked #1 out of 53 UK online casinos-
£500
Welcome Bonus
T&C's Apply
18+ only, New customers only. Min deposit £20, Maximum Bonus £ 200, wager 40x before withdrawal. Game weighting applies. Bonus betting restrictions: slots - £5, all other games – 10% of bonus amount. T&Cs apply.
- 97.32% Average Payout
- 2-3 Days Payout Speed
- 400+ Real Money Games
- Platforms
-
Deposit Options
Karamba
Ranked #2 out of 53 UK online casinos-
£50
Welcome Bonus
T&C's Apply
18+ only, new depositing players. Min deposit £ 10, Wagering requirements apply, 35x, offer valid for 72 hours. 100 spins includes 3 deposits. Full terms apply.
- 97.49% Average Payout
- 1-2 Days Payout Speed
- 300+ Real Money Games
- Platforms
-
Deposit Options
Casimba
Ranked #3 out of 53 UK online casinos-
£500
Welcome Bonus
T&C's Apply
18+. New players only. 1 bonus offer per player. Min. deposit £20. Max. bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Bonus funds expire in 30 days, unused bonus funds will be removed. Bonus funds are 100% match up to £500 on your 1st deposit, 25% match up to £1000 on your 2nd deposit, and 50% match up to £500 on your 3rd deposit. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds count towards wagering contribution. BeGambleAware.org full terms apply.
- 97.61% Average Payout
- 1-2 Days Payout Speed
- 500 + Real Money Games
- Platforms
-
Deposit Options
Betway
Ranked #4 out of 53 UK online casinos-
£50
Welcome Bonus
T&C's Apply
18+New customers only. Opt-in required. 100% Match Bonus up to £50 on 1st deposit of £10 . 50x bonus wagering applies as do weighting requirements. Debit Card deposits only. Irregular gameplay may invalidate your bonus. This offer is valid for 7 days from your new account being registered. full terms apply. BeGambleAware.org and Bet The Responsible Way
- 97.76% Average Payout
- 1-2 Days Payout Speed
- 400+ Real Money Games
- Platforms
-
Deposit Options
Yeti Casino
Ranked #5 out of 53 UK online casinos-
£111
Welcome Bonus
T&C's Apply
#AD New customers only, min deposit £10, wagering 60x for refund bonus, max bet £5 with bonus funds. Free Spins bonus has x40 wagering. 23 free spins on registration (max withdrawal is £100). 100% refund bonus up to £111 77 spins on 1st deposit. No max cash out on deposit offers. Welcome bonus excluded for players depositing with Ecopayz, Skrill or Neteller. full terms apply.
- 97.34% Average Payout
- 1-2 Days Payout Speed
- 400+ Real Money Games
- Platforms
-
Deposit Options
Getting to Know Slot Games
There are lots of reasons to love slots. The free play versions, real money games, huge prizes, affordability and simple gameplay have made slot machines the biggest online gambling game.
When you visit the best online slots casino, you'll find hundreds of different titles. Enjoy classic three-reel slots with a single payline or choose the latest video slots that give you hundreds of ways to win on every spin.
You'll find games in a variety of themes too, with some of the most popular themes including:
- Superheroes
- Mobsters
- Ancient history
- Mythology
- Hollywood blockbusters
- Music and famous bands
Whether you play live or at an online casino, UK players like you need to know that today's fruit machines are in a league of their own. The best games have console quality 3D graphics, brilliant animation, and gripping soundtracks.
When you play at a UK casino, slots games are accompanied by all sorts of bonus features. With free spins and multipliers, the cash prizes can add up quickly. What's even better is that anyone can afford to play. Not only are the stakes adjustable, but you can enjoy nearly any game for free.
Top Slot Machine Tips
- Make sure to claim an online casino bonus
- Understand that slot machines are games of chance
- Take advantage of free games to find new favourites
- Choose titles that have the best payouts
- Get familiar with the paytable before playing
- Keep tabs on progressive jackpots
- Place bets that are in line with your budget
- Earn free play using the casino rewards program
- Pace yourself so you don't run out of cash quickly
- Realise that every spin is independent
What Our Handpicked Top UK Slots Casinos Offer
Finding a great UK-based online casino for slots isn't rocket science. It's simply a matter of knowing what to look for. Our online slot machine experts have tested licensed sites available in Britain to find the absolute best places to play, and we're happy to share our methods and findings with you.
It's important that you know what makes for a great gambling experience. All of our recommended online casinos:
- Are regulated and licensed by the UK Gambling Commission
- Use advanced encryption to keep you safe
- Offer excellent customer service by phone and live chat
- Have a vast library of online casino games including the best online slots
- Only use the most secure banking methods for efficient deposits and fast withdrawals
What are the most popular online slots games?
- Castle Builder II – Find matching materials on the reels and build the best castles. This slot has excellent payouts and a constant feeling of progression as you travel across the country building castles for royalty.
- Mega Fortune: This luxury-themed slot game has a history of record-breaking jackpot wins worth over £10 million. While jackpots will vary depending where you play, this slot is always very popular.
- The Wizard of Oz: Whether you're a fan of the original film or just like massive payouts, you'll enjoy playing The Wizard of Oz. Tons of bonus games keep this game exhilarating and varied.
- Everybody's Jackpot: As the name implies, this game shares out the jackpot with all the players at the time of a jackpot win. So, even if you aren't the lucky winner, you'll share in the exhilaration of the big win.
- Monopoly: There are tons of different Monopoly-branded slot games, each with a unique appeal. These games offer some of the best bonus games you can find in an online slot game, plus they hit often.
Progressive Jackpots
When visiting casinos online, UK fruit machine fans will want to try their luck playing progressive slots. These games feature ballooning prize pools that continue to grow with every spin of the reels, until a lucky player hits the jackpot.
Popular titles like Jackpot Giant and Mega Moolah are often worth millions of pounds.
Play Online Slots for Free
There are plenty of options if you're looking to play free online slots. No deposit bonuses let you win real money, slot machines are played with bonus cash so that you can win big without any risk.
Otherwise, you can simply play slots for fun and see which games you like the best or enjoy all the excitement a game has to offer without worrying about your bankroll.
Play for September's Top Jackpot
At Hippodrome with £250 bonus
Enjoy Mobile Slots Anywhere, Anytime
You might not know it yet, but there are hundreds of action-packed online slots in your pocket right now. Whether you're playing for jackpots or just looking for bonus spins or bonus games, we will find the top slots for you. If you have a smartphone or tablet, you can log on and play anywhere in Britain.
All you need is an iPhone, Windows Phone, iPad, or Android device plus an internet connection and you can start spinning the reels to your heart's content. To play the best slots at a mobile casino, UK players will have the option of downloading apps or enjoying instant play games in any browser. Just visit an online slots casino listed on this page using your mobile to get started.
Conclusion: Enjoy the Best Online Slot Machines
There are so many reasons to enjoy playing slots online. Win real money or play for fun with the best online casino slots. When you visit the best casinos online, you'll get to enjoy internet slots with great payouts for free or real money.
We've found the best places to play online slots. UK players can enjoy top casinos with excellent games, secure banking and stellar bonuses. Why wait? Win real money, slot machines are even better online!
Avoid These Blacklisted Sites
Let's cut right to the chase. These sites are the worst online casinos in 2021 and we urge all players in the UK to avoid them.
Cool Cat Casino
- Very slow payments
- Unresponsive support
- Unreliable promotions
Casino Fiz
- Payment Issues
- Shady practices
- Unfair promotions
Osiris Casino
- Not delivering on promos
- Poor business practices
- Slow communication
Frequently Asked Questions
How do online slots work?
Online slots work just like their offline counterparts. After finding a game that appeals to you, adjust the size of your bet and press the spin button. You'll win if you match any of the symbol combinations listed in the pay table.
Is it safe to play online?
Yes – it's safe to play at online casinos. UK players will want to choose a reputable slots site that's licensed by the UK Gambling Commission. You can find incredible casinos by following the links on this page.
How much can I win playing slots at UK online casino?
The top prize depends on the game you play and the size of your bet. It is possible to win a life changing real money prize playing slot machines. The best slots casino jackpots can be worth millions of pounds. Of course, there are plenty of smaller prizes up for grabs too.
Can I play slots on my smartphone or tablet?
Yes – most internet casinos are now mobile compatible. iPhone, iPad, Windows Phone, Microsoft Surface, and Android users can enjoy hundreds of games on the go. Just make sure you have an active internet connection.
How do I find a great bonus?
Our slot machine specialists have found the biggest bonus offers available in the UK. Just browse the bonuses listed on this page and follow the link to get your free cash and complimentary spins.
What are the most popular online slots games?
With hundreds of games to choose from, there are so many popular internet slots including Castle Builder II, Everybody's Jackpot, Mega Moolah, Mega Fortune, The Wizard of Oz, and Monopoly.
Can I play online slots for free?
All of our recommended online casinos have option for free play, so you can play free online slots for fun.
What is a progressive jackpot?
A progressive jackpot begins with a set prize, but grows ever higher with every spin of the reels. These prizes can grow to lucrative levels and payout live-changing prizes.
Mansion
Ranked #1 out of 53 UK online casinos-
£500
Welcome Bonus
T&C's Apply
18+ only, New customers only. Min deposit £20, Maximum Bonus £ 200, wager 40x before withdrawal. Game weighting applies. Bonus betting restrictions: slots - £5, all other games – 10% of bonus amount. T&Cs apply.
- 97.32% Average Payout
- 2-3 Days Payout Speed
- 400+ Real Money Games
- Platforms
-
Deposit Options
