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We compare, rate and share the best slot sites in the UK on this page, helping you rediscover classic slots or try your hand at progressive jackpot slots with huge prizes. Check out the best UK slot sites and claim exclusive slot bonuses below.
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UK slot sites all want your custom but it's not always obvious which are the best for you, the player. And you're not the same kind of slot bettor as everyone else.
Fortunately, our slot experts scour the web to identify the best slots sites in the UK, plus the best slots, so we can make recommendations based on genuine research.
We rate and highlight the best UK slot sites for features like welcome bonuses and free spins a little further down this page.
Also, we highlight legitimate and safe slot sites and lead you away from the less trustworthy. We also present you the sites with the best bonuses, free slots, fastest payouts, and best customer service.
Once you've read this guide, you'll be armed with all the information you need to bet on excellent slots at all the best places.
To rank the best slot sites, one of our slot experts assesses hundreds of leading UK slot sites based on game variety, game quality, user experience, bonuses, and variety and volume of slots. We try to keep our slot site review process the same every time for fairness and consistency. This is how we rate a slot site:
Step 1: we open an account at each site and judge the simplicity of the sign-up process and the security provided.
Step 2: we also test and compare online casino bonus offers among sites.
Step 3: we make deposits using different payment methods and play the site’s games, testing them for fairness, speed, and graphics.
Step 4: we also make withdrawals to assess payout times, and contact customer support to see how competent and friendly they are.
Step 5: what’s more, we consider which sites have something special. For instance, 888casino has a great slots selection but it also has one of the best online poker sites on the same platform, plus a no deposit free spins welcome offer.
The best online slots sites in the UK work well on desktop, Android and iOS devices, while providing great bonuses and convenient banking methods.
We also pay attention to new slot sites UK players can join, so we'll alert you as soon as they launch. Plus, we track established sites to make sure they haven't rested on their laurels.
We couldn’t look past 888casino with its 10 no deposit, no-wagering free spins on Holy Mackerel Extreme Fishing every month for the rest of 2023. You don't have to do anything to get the 10 free spins and anything you win with them, you can withdraw straight away!
Mr Vegas is another excellent site for bonuses — when you make your first deposit, you get a 100% matched deposit bonus up to £200, plus 11 wager-free spins. You have to deposit £10 to get this bonus but any winnings you take from the free spins can be withdrawn there and then with no wagering requirements to worry about.
Party Casino has more than 5,000 slot games and counting, so it’s an excellent site to bet on slots. Not only that but you can get a £250 bonus when you sign up and deposit.
Why not check out Party Casino's welcome bonus below?
Crystal Slots is one of the best online casinos for free spins bonuses. On your first deposit, you can get up to 500 extra spins on Sweet Bonanza. Plus, the casino provides other free spins offers like a spin of the Trophy Mega Reel when you earn five trophies by betting at the site. The mega reel gives up to 500 free spins on the Master Joker or Tree of Riches slots.
Mr Vegas had, at our latest count, more than 320 jackpot slots for you to choose from – that even impressed our battle-hardened reviewers. It also has a table of the latest jackpots from biggest to smallest, which features a Book of Atem WowPot of £33.3m and a Mega Moolah Lucky Bells jackpot of £6.6m.
The casino also boasts the progressive jackpot games Mega Moolah: Goddess, Mega Fortune, Ancient Fortunes Poseidon WowPot Megaways, Immortal Romance: Mega Moolah, and Bankin’ Bacon.
You can even play slots alongside live casino games like blackjack or online baccarat casino titles at Mr Vegas.
NetBet is a legit casino site for new slots and it even has a New Games tab which makes it easy to find something fresh. When we reviewed the site, some of the featured new games were Secret 7s, Tommy Gun’s Vendetta, Million Zeus, Big Size Fishin’, and Wolf Fang: The Origins.
NetBet also boasts jackpot slots like Gladiator Jackpot and Age of the Gods: Glorious Griffin, plus it has thousands of other slot games to try.
Casumo, on iOS and Android, is our choice for mobile casino sites, because it has more than 2,000 games, fun daily tournaments, and random cash drops every day. You can also win bonus spins on Sahara Riches Cash Collect in one of the casino's promotions.
Plus, players have also praised how smooth the Casumo app is, which is a weakness for other casino apps.
The best online slots in the UK are a matter of personal preference but some slots have proved universally popular over the years. They include classics like Gonzo’s Quest, Mega Moolah, Starburst, and Rainbow Riches.
You can try demos of these classic slots, plus new online slots, by joining the casinos featured below. Just take note of the casino below each slot to know where to play those titles.
A progressive jackpot slot is a game where the main prize keeps growing until someone wins it and then the jackpot starts to build again. A handful of lucky UK slots players have won mega moolah by playing progressive jackpot slots at UK sites in recent years.
One of the most famous wins came in 2015, when an English soldier called Jon Heywood won a cool £16 million playing the Mega Moolah slot.
He staked just 25p on a spin and landed the jackpot, which saw him claim a place in the Guinness Book of World Records. A Belgian player has since topped Jon Heywood’s win, playing Mega Moolah, but many slot lovers are bidding to claim a new record each day.
The 2023 jackpot slots with the biggest prizes at the time of writing are:
Most sites use an online slots bonus to attract new customers. They vary and they come with different wagering requirements, so it pays to shop around for the best offers.
Some sites offer a no deposit bonus on slots when you sign up for a new account. You might find one at other times but this kind of bonus is rare. One of the few sites that provides a slots bonus where you don’t have to deposit first is 888casino, which currently offers 88 free spins when you open an account with them.
A reload bonus is a deposit incentive and reward aimed at players who have already opened an account with a casino. As an example, a casino might give you a 50% reload bonus up to £200 when you deposit at least £30. This reload bonus is usually awarded as a non-withdrawable amount which must be wagered before it can be withdrawn as cash.
A casino might also give you cashback if you deposit a minimum amount but lose bets during a certain period. For example, if you deposit at least £20 but lose all of that in the next seven days, you could get £2 or 10% back once the week is over.
Almost every slot site advertises a welcome bonus to convince bettors to join and these are usually based on your first deposit, or sometimes, up to your first four deposits.
For example, one site might offer a 100% sign up bonus for slots worth up to £500, plus 50 bonus spins. So if you deposit £500, you get £1,000 to play with and 50 extra spins.
Some of the best slots sites even offer daily free spins to players. These can be a bonus for betting a certain amount the previous day or week, a cushion if you lose bets, or a large free spins prize that's given over several days.
The best UK slot sites have a loyalty programme, aka a VIP programme, where you’re rewarded for being a regular bettor. You can earn rewards like lower wagering requirements for bonuses, holiday prizes, a personal customer support assistant, and the ability to use your cash balance online and at land-based casinos.
Another important factor is the wagering requirement, also known as the rollover requirement. This refers to the number of times you need to play this bonus credit before you can make a cash withdrawal.
Imagine you're renting books from a library. The wagering requirement is like a rule that says you need to read a certain number of pages before you can rent a book, or in this case, withdraw bonus funds.
You keep reading (playing games) until you've read enough pages (bet your bonus money enough times) to meet the requirement. Once you do, you can ‘check out’ your winnings.
If you'd like to know more about how wagering requirements work, you should visit our slots bonus page for a detailed explanation. There, you can also use our wagering calculator to see how much you need to playthrough before you can withdraw any bonus winnings.
The online slots world keeps growing. Players have more entertaining casino games to choose from than ever, with new themes and technology being introduced all the time. Modern slot games can be divided into several categories:
These are the original online slot games and they still exist on slot sites, despite becoming dated. Classic slots often have traditional themes and are reminiscent of fruit machines at land-based casinos.
Playing online slots has become more exciting with the release of the video slot, which is now the dominant slot type. Their game mechanics are more evolved than in classic slots, and can feature more paylines and eye-catching bonus rounds. Their improved graphics allow for in-depth characters and themes and the overall experience is more immersive.
Video slots online include 3-reel and the more elaborate 5-reel slots, which contain exciting features like wilds and scatter symbols, with live-action backgrounds and animations.
3D slots take video slots to another level. These cutting-edge games feature characters that feel like they’re jumping out of the screen, making betting on online casino slots almost cinematic. Sometimes these games feature 3D cutaway scenes as part of bonus rounds, while others are a total 3D experience.
The top 3D slots of 2023 include The Rift, Turning Totems, Gonzo’s Quest and Jungle Jim El Dorado.
Another recent creation is the live slot game. Like live blackjack and roulette online, these feature a live human dealer who seems to be inside the game, alongside the slot’s virtual character. Good examples of live slot games are Gonzo’s Quest Live from NetEnt and Safari Riches Live by Playtech.
A scatter slot is simply a slot game that features scatter symbols, which, if you land them, can help boost your win. They make games more fun and lucrative. These scatters usually tie in with the theme of the slot machine like pyramids in an Ancient Egypt-style game.
These games are very popular as they give players the chance to win huge prizes from small stakes. Casual players have good reason to think these are the best slots to play for real money, because they stand a chance of banking a big win that previous players have helped grow.
With a progressive jackpot slot, a small portion of each player’s stake contributes to the jackpot, which rises until a player triggers it. There have been several players winning seven-figure and even eight-figure prizes lately.
These slots mimic the machines you find in bars and arcades across the UK, featuring three reels and a payline in the middle. Symbols generally include classics like fruit, bells and the number seven.
‘Fruities’ give you the option to hold or nudge reels, adding another layer of fun. The best fruit machine games at online slots sites for 2023 include Fruit Shop, Booming 7 and Fruit Fiesta.
The trend for themed slot games has accelerated. Themed slots are similar to video slots, but they follow a narrative based on a famous movie, TV show, band or another pop culture icon. Some of the best branded slots in 2023 are A Nightmare on Elm Street: Megaways, Britain’s Got Talent, Vikings, and Guns N’ Roses.
A random number generator (RNG) is used to calculate the result each time you hit spin on an online slot game. An RNG is also used on physical slots found in casinos and arcades, and is used to determine the results of online casino games like at online blackjack sites.
The random number generated goes through the game’s software and produces a tangible result, giving you a win or a loss.
All licensed operators providing for UK players will fall under the jurisdiction of the UK Gambling Commission (UKGC), which monitors the RNG technology that online slots sites use to ensure it remains fair.
The key concept to familiarise yourself with when playing slots online is RTP, which stands for return to player percentage. This percentage refers to the amount of money a slot is expected to return to you over a prolonged period, based on a calculated average.
It essentially refers to the house edge. If a slot has an RTP of 94.75%, it means the average the house claims will be £94.75 for every £100 staked. However, slots are games of chance, so some players will make a profit and others will make a loss. That’s just how it goes.
The RTP gives you an idea of the average return you can expect. You should look for as high an RTP as possible. NetEnt’s Mega Joker has offered an RTP of up to 99%, while Jackpot 6000 goes up to 98.8%, making these some of the best slot games in terms of RTP.
You will be presented with a payout table when you browse the games at the best online slots sites. It will tell you the symbol values and the paylines, while explaining features and any relevant jackpot information. Payout tables also list the prizes either as a cash amount or as a multiplier.
For example, if you see ‘100x’, it means you stand to win 100 times the size of your single line bet. It will also inform you of the online slots bonus rounds and the minimum and maximum prizes. You can use this information to determine your potential payouts on new online slots.
The best UK slots providers compete to launch the most popular games each year and sell to the best slot sites in the UK. And the best online slot sites let you filter games by provider. It's not unusual for players to prefer one slot provider over others, because they tend to create games of a certain style.
For example, Play'n GO creates slots with interesting stories, incredible graphics, and humour, while NetEnt makes slots, including jackpot slots, that have a certain ingredient that helps some reach legendary status.
These are the top slot software providers in the industry right now:
The Isle of Man-based firm is one of the largest online slots providers in the UK. It supplies hundreds of titles like Mega Moolah, Game of Thrones, Mermaids Millions and Thunderstruck II.
The Matrix, Superman, Top Gun and American Dad are some of the exciting branded casino slots that Playtech has produced. It’s also famous for making Age of the Gods and Big Bad Wolf.
This Swedish software supplier is responsible for some of the best online slots in the UK, including fan favourites Starburst, Gonzo’s Quest and Mega Fortune. It also makes branded video slots, such as Gordon Ramsay’s Hell’s Kitchen.
This is another Swedish company with a wealth of exciting UK online slots to its name. Play’n GO is responsible for hits, such as Troll Hunters 2, Book of Dead and Mystery Joker.
International Game Technology or IGT is a multinational firm headquartered in London, with offices in Las Vegas, Rhode Island and Rome. It’s a pioneer in branded video game slots, and its biggest hits include Family Guy, Da Vinci Diamonds, Pharaoh’s Fortune, and Cleopatra.
The digital division of Scientific Games produces several exciting slots after purchasing other providers, NYX Entertainment and NextGen. They include Raging Rhino Megaways, Lucky Lanes, and Prisma Blast.
Austrian software provider Novomatic celebrated its 40th birthday in 2020. It works with the best slot sites in the UK and releases new online slots on a regular basis. They include Sizzling Hot, Book of Ra and Lord of the Ocean.
This software firm is renowned for quirky releases, such as The Slothfather and Good Girl Bad Girl. It has a particular focus on mobile online slots and casinos and 3D slots.
You can play free demo games of the best UK slots right here by visiting our free slots catalogue.
The best online slots sites often host tournaments based on a certain slot – typically a classic game or a hot new release. You can join these tournaments and bid to complete the challenges to climb the leaderboard and win prizes. Exciting prizes include cash, trips, cars, and gadgets.
These online slots tournaments are generally hosted in collaboration with the software provider to boost the profile of a game. They allow players to earn valuable prizes and are worth finding at the best gambling sites for UK slots.
You could visit some of the sites above or other casinos featured on this page, and then set up an account and play the best UK slots by following these steps:
The best slots sites will offer you a wide range of payment methods for making deposits and withdrawals. Debit card payments are popular among visitors to UK slot sites and are widely accepted.
Common online casino payment methods include e-wallets, such as Neteller or PayPal, but you probably won’t be able to claim a bonus if you opt for Neteller or Skrill as it’s difficult for a casino to track if users have claimed the bonus before.
Vouchers, such as a Paysafecard, are accepted at many new online slots sites, along with other prepaid cards.
In addition, withdrawal times vary depending on the online casino you play at and the withdrawal method you choose.
You might need to make withdrawals via the same method you used to make a deposit, as this is a licensing condition designed to stamp out money laundering.
James Briscoe Editor
James worked in non-league football as a press officer before copy-editing local and national newspapers from around Britain. He then stepped into the online casino world in Malta as a copywriter, and since then, he’s continued his iGaming journey as a freelance writer, and is delighted to be helping make Casinos.com content the best it can be.
You can find the best online slot sites right here on our page. Our team has found the best online casinos that show the best slots sites UK players can visit. We check available games, bonuses, security, customer support, availability, payment methods, and more.
An online slot with the highest possible RTP will give you the best chance of winning. Return to player (RTP) highlights how much a slot game pays back to players on average. Just remember, no game provides a guarantee of success.
Yes, absolutely. We only recommend the most reputable slot sites UK customers can join today. Our team works hard to ensure all sites we list are fully licensed by the United Kingdom Gambling Commission (UKGC) and provide secure payment options, allowing players to gamble responsibly.
Online casinos with a licence with the United Kingdom Gambling Commission (UKGC) are no longer allowed to offer credit cards as a payment method. However, UK customers are able to visit non-UK-licensed casino operators and use credit cards there if they wish.
Yes, the online slot sites we recommend provide a range of bonuses for new and existing players. This includes welcome bonuses and ongoing promotions for players who have already created an account. Common online casino bonuses include deposit matches, free spins and no deposit bonuses.
At many online slot sites, the value of your bet will be shown in coins. For example, you can bet 10 coins at a total value of £0.10 or £1, depending on the value of each coin. Also, you can often increase or reduce the coin value if you're a highroller or want to play it safe.
There are so many online sites that almost everyone could pick a different game as their favourite. Mega Moolah is popular because of the big wins it’s produced, while Starburst has a classic but modern quality that’s made it stand out. Ultimately, it’s up to you to find your favourite.
Although there are myths that it’s easier to win on online casinos at the end of the month, there’s no number one best time to play. However, it might be best to play slots when there’s a tournament in play, because players that win big can finish on the tournament leaderboard and win another prize.
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