How we Rate Slot Sites
With over 30 years of combined industry experience, the team here at Online-Slot.co.uk live and breathe online slot games. Any slot site we list here has gone through a rigorous process whereby we register, deposit and play the slots on offer. Then we look at important aspects like bonuses and promotions, payment methods available, cashout times, customer support and reputation. Let’s dig a little deeper into what goes into our slots sites reviews:
Slots Offering
| NetEnt | Microgaming |
| Play ‘n GO | Playtech |
| Big Time Gaming | IGT |
| Yggdrasil Gaming | Nolimit City |
| Quickspin | WMS |
Whilst not all online slot sites have games from all the providers mentioned, a good mix of providers will give you a wide choice of slots to play. Some of the best slot sites do have most providers covered. The likes of Videoslots Casino and SlotsMillion Casino focus on slots and have over 3,000 and 2,000 slots respectively.
A good sign of a top slot site is one that has the best slots – i.e. the most popular titles. We look for the likes of:
| Starburst, Gonzo’s Quest + Dead or Alive 2 | NetEnt |
| Book of Dead + Wild Blood 2 | Play ‘n GO |
| Immortal Romance + Thunderstruck 2 | Microgaming |
| Age of the Gods + Buffalo Blitz | Playtech |
| Bonanza Megaways + Star Clusters Megaclusters | Big Time Gaming |
| Book of Ra Deluxe + Lord of the Ocean | Novomatic |
| Deadwood + San Quentin | Nolimit City |
| Zeus + Black Knight 2 | WMS |
| Cleopatra + Da Vinci Diamonds | IGT |
Another indicator of the better slot sites is how many new slots they have. New titles are released almost daily with over 100 new games available every single month. The best slots sites will offer new games as soon as they are available.
Some slot sites even release slots exclusively early. The likes of Mr Green, LeoVegas, bgo, Paddy Power and Rizk frequently have slots not available anywhere else (for a limited period).
Finally, have a good section of jackpot slots is also important to many players. Whilst they are different types of jackpot slot games, some offer life-changing jackpots. We look for the likes of Mega Moolah, Mega Fortune and Hall of Gods which offer jackpots that can reach 7 or even 8 figures. For more on progressive jackpot games, check out our list of jackpot slots.
Bonuses + Promotions
Everyone wants slot sites with a bonus. The best slots casinos sites will offer a slots-focused bonus. Most slot games contribute 100% to the wagering requirements so they are the best games to play when claiming a slots bonus.
Many top slot sites also offer free spins on slot games. You can get no deposit free spins or free spins upon your first deposit. The better slots-focused casinos will have offers on the most popular slots like Starburst and Book of Dead. Most free spins offers are valid on NetEnt, Play ‘n GO or Microgaming slot games.
It’s not just slot site’s welcome bonus that matters. Ongoing promotions and offers are equally if not more important to players. We look for good slot sites that have a range of incentives for slots players that include:
- Free spins on new releases
- Free spins on a certain range of slot provider games
- Leaderboard prizes for playing certain slots
- Random cash prizes + drops
- Slot Tournaments with free spins + cash prizes to be won
If you’re a loyal customer at a slot site, they can drop you free spins to try out the latest release or a top slot game every so often. Having promotions and incentives aimed at slot games is a great indication of how good a slot site actually is.
A growing trend are slot tournaments. Players compete against each other for the chance to win prizes such as cash bonuses or free spins. Normally, you have to play a slot game or from a selection of slots. The players who wager the most or achieve the biggest win multipliers will win a share of the prizes. Some slot sites run tournaments every 15 minutes or hour. As with all promotions and offers, please check the Terms & Conditions prior to claiming.
Payment Methods + Withdrawal Times
Playing slots is what you want to do but being able to deposit and withdraw is a crucial part in doing that. Whilst most slot sites will offer debit card deposits, having a range of payment methods is important to many. Make sure a site has the most popular payment options such as:
| Debit Cards | PayPal |
| NETeller | Skrill |
The best slots sites will also have newer payment methods like MuchBetter, Apple Pay and Boku which are aimed at mobile slots players. You should also consider the minimum deposit amount with £10 the average. Make sure deposits are free and have no charges.
Whilst it may be easy to deposit, a sign of a good slot site is how quickly they process withdrawal requests. The better ones will process within a matter of hours or even minutes. On average, expect e-wallet cashouts to hit your account within 24 hours. As for debit cards and bank transfers, between 1 and 3 days is the average.
Some of the better slots casinos offer facilities such as lock withdrawal features. This allows the player to lock in their cashout request so they cannot reverse it and play with their winnings. It guarantees their receive their winnings no matter what. The likes of SlotsMillion Casino and Risk Casino have this option available.
Finally, you need to consider fees for both depositing and withdrawing. On the whole, depositing is normally free. Some withdrawals can come with smalls, albeit small. The best slots sites will process your withdrawals quickly and for free. Make sure to read the fine print when requesting a cashout.
Customer Support
Being able to contact a slot site’s support team is an important factor sometimes overlooked. You may need to query a promotion or might need help withdrawing your winnings. Having a reliable customer service team in place is crucial to a site’s reliability and success.
Whilst picking up the phone nowadays has by and large become redundant, there should be a number of ways you can get in touch if you have any questions, queries or issues. The best slot sites offer various ways you can get help including:
| Live Chat | The quickest way to contact support |
| Telephone | A UK freephone number is ideal |
| Online Services | WhatsApp + Skype are popular these days |
| Having an email address is a must | |
| Social Media | Active Facebook + Twitter accounts helps |
| FAQs | Extensive help section on website can help cover most queries |
| Callback | Some sites offer to call you back at a time convenient for you |
Whilst most slot sites will offer most of their contact methods, the Live Chat function has become the most way to communicating with a support team. Everything is written down in black and white with some sites sending you a transcript of your interaction with them via email. This allows for your documentation to be documented if you wish. With Live Chat, you can send attachments (like copies of ID), send voice notes and even make calls.
Whilst having all these ways to interact with a slots casino’s support team is great, response times are equally if not more important. You don’t want to be waiting for hours to hear back regarding a small query. The best slot sites will be with you in a few minutes at most, even during peak hours.
Track Record with the UKGC
First and foremost, slot sites in the UK need to be licensed and regulated by the Gambling Commission. They are also known as the UKGC. They were set up under the Gambling Act 2005 to regulate commercial gambling in the UK. They ensure licensees follow the License Conditions and Codes of Practice.
If a slots site doesn’t follow their rules and regulations, the UKGC will take action which can include fines and a license suspension. Their aims include:
- Prevent gambling from being a source of crime or disorder
- Ensure that gambling is fair and transparent
- Protect children and vulnerable persons from harm or exploitation
All slot sites listed here are licensed by the Gambling Commission and have a fully operational trading license. We also look at the companies behind the sites to ensure you safety and protection. Whilst many new sites popup all the time, we like to know where we play our favourite slot games and if it’s safe to do so.
We keep on top of industry news to ensure we only recommend the best slots sites. If we take a look at Rizk Casino for example, it’s part of the Gaming Innovation Group. They also run Guts Casino which tells us they are trustworthy and reputable.
Best UK Slot Sites by Category
Want to know what the best slot sites are? A lot depends on what you’re looking for as a player. You might be looking for the highest payouts, the site with the best range of online slots or the slots casino with the best mobile product.
To help you make an informed decision, we’ve split the best sites into the following categories:
Highest Payouts
The top slot sites have the slot games with the highest payouts. This means the slots with the highest RTP (return to player) rates. Whilst a lot depends on the slot providers found at a particular slot site, having a range of online slots with an RTP of 97%+ is favourable.
If you refer to the top RTP slots, the best slots for payouts include Thunderkick’s 1429 Uncharted Seas, NetEnt’s Blood Suckers, Yggdrasil Gaming’s Jokerizer and Big Time Gaming’s White Rabbit Megaways amongst others.
Most slot sites have the slots with the highest RTP rates. However, many slot casinos don’t publish the RTP rates for all slot games together. An exception is bgo Casino who have a dedicated RTP page within their help section.
Best Low Wagering Slot Site
Playing slot games is what we you’ve come to this guide for. A site may have the best collection of slots but it wouldn’t be worthwhile if their bonus has high wagering requirements for their slots bonus or free spins.
What you want is a slot site with low wagering requirements on their welcome offer. Here are the best low wagering slot sites:
| Slot Site | Welcome Offer | Wagering Requirements |
| PlayOJO Casino | 80 free spins | None |
| Grosvenor Casino | 100% bonus up to £20 | 5 x Bonus |
| Trada Casino | 10 free spins + 100% bonus up to £50 | 25 x Bonus |
| Casino Lab | 100% bonus up to £100 | 40 x Bonus |
| LeoVegas Casino | Up to 30 Free Spins | Wager Free |
Best PayPal Slot Site
As we’ll all agree, PayPal is one of the most popular ways of depositing and withdrawing funds at a UK slot site. It’s a secure payment method and cashouts tend to be very quick, within a matter of hours.
Whilst not all UK slot sites take PayPal, the best sites allow you to use PayPal for their welcome offer. You also want PayPal withdrawals to be free.
Here’s a list of the best PayPal slot sites that allow maiden deposits for the welcome bonus and offer free cashouts with the popular e-wallet solution:
| Slot Site | PayPal for Welcome Offer | Free PayPal Withdrawals |
| 888casino | ✔️ | ✔️ |
| Casino Gods | ✔️ | ✔️ |
| Paddy Power Casino | ✔️ | ✔️ |
| Novibet Casino | ✔️ | ✔️ |
| LeoVegas Casino | ✔️ | ✔️ |
Slot Sites with the Best Slot Games Offering
Whilst they are 1,000s of slot sites in the UK, not all are created equal. If you’re looking for the best selection of slot games, there’s a couple that stand out:
SlotsMillion Casino
Dedicated fully to online slots, SlotsMillion Casino has over 2,400 slot games to choose from. They have an extensive range of providers including the likes of Playtech, NetEnt, Big Time Gaming, Play ‘n GO, Microgaming and Novomatic. They even have more niche providers like Skywind, Fantasma Games and Push Gaming.
It’s a slot lover’s dream as you can filter the slots by theme, bonus features and paylines. Furthermore, they offer you the first Virtual Reality real money casino where you can enjoy your own private casino room with more than 40 of the most popular slot games.
Videoslots Casino
Focusing on slot games, Videoslots Casino does exactly what it says on the tin. With over 3,300 slots to play, they have the largest range of games from the top providers like NetEnt, Playtech, IGT, Play ‘n GO and many, many others.
Whilst they also cater to casino players with a selection of roulette, blackjack and video poker games, they have Clash of Spins promotions every 2 hours where players can win a share of free spins.
Best Mobile Slot Sites
All slot sites found here at Online-Slot.co.uk are mobile friendly. This means you can play on a variety of mobile and tablet devices that use iOS, Android and Windows operating systems.
The best slot sites have dedicated mobile apps which can be used on iOS and Android devices. Whilst mobile browser play is good enough, having a dedicated slots app allows for clearer graphics, faster play and convenience of having the slot site’s icon on your smartphone or tablet.
Here are 5 best mobile slots which have both iOS and Android apps:
| Slot Sites | iOS Mobile App | Android Mobile App |
| LeoVegas Casino | ✔️ | ✔️ |
| Mr Green Casino | ✔️ | ✔️ |
| Paddy Power Casino | ✔️ | ✔️ |
| 888casino | ✔️ | ✔️ |
| PlayOJO Casino | ✔️ | ✔️ |
New Slot Sites
With so many places to play slots online, you may have played al the top slot sites already. With new sites appearing almost every other week, finding a new slot site might be the way forward.
With strict criteria in place when we review slot sites, playing a new UK site can have it’s many advantages. With innovative design and themes, they often come with top slots bonuses, dedicated mobile apps, a huge list of slots and even some new providers. Check out our New Slot Sites section for the freshest products to hit the UK market.
Features of the Best Slot Sites
With all that has been written above, we look for the best of the best when it comes to slot sites. Here’s a list of features, with examples, of the best slot sites in the UK:
Clear focus on slot games
There are many casinos that have slots as part of their offering. As a slots portal, we look for operators who take pride in their slot game portfolio and try to offer as many as possible from the best providers in the industry. An example is Videoslots Casino who have over 3,300 slots to play.
100% wagering requirement contributions
Taking advantage of a welcome bonus or offer is something we all do. Having slot games contribute fully (100%) to the wagering requirements is a must in our eyes. There are obviously some exceptions (like high RTP slots) but the majority should be valid. Luckily, most slot sites allow 100% wagering from their slot games.
Slot promotions for new + existing players
You can tell if a site is dedicated to slots from the off. The welcome bonus/offer is a tell-tale sign. Likewise are ongoing promotions and offers which centre around particular slot games or new releases.
If you take LeoVegas Casino for example, they have a welcome offer where you get a bonus plus wager-free spins on the popular Book of Dead slot. That’s not all. They have free spins offers on their new slots which gives players to get a little extra for trying a new game.
At the time of writing, they are offering free spins on Big Time Gaming’s Star Clusters Megaclusters slot. Expect regular slot offers at LeoVegas Casino.
Diverse Slots Offer
Whilst many sites will advertise they have 2,000+ slots, how many of them are from the same provider like Microgaming? Having slots from a wide range of providers is ideal as you get to sample multiple styles, game mechanics, bonus features and innovations.
If you take 32Red Casino for example, they only used to offer Microgaming slots. Since they are part of the Kindred Group (i.e. Unibet Casino), they now have games from many providers like NetEnt, Barcrest, Blueprint Gaming, WMS, Bally, Big Time Gaming and NextGen Gaming.
If you’re looking for a slot games from a particular provider, here’s the best slots site by provider (the top 5):
| Provider | Popular Provider Slots | Best Slot Site |
| NetEnt | Starburst, Gonzo’s Quest + Dead or Alive 2 | Casino Lab |
| Play ‘n GO | Book of Dead, Dragon Maiden + Reactoonz | Duelz Casino |
| Playtech | Age of the Gods, Buffalo Blitz + Suicide Squad | NetBet Vegas |
| Microgaming | Immortal Romance, Thunderstruck 2 + Game of Thrones | Novibet Casino |
| Big Time Gaming | Bonanza, Star Clusters + Monopoly Megaways | LeoVegas Casino |
Filters
Having anything over 1,000 slot games is great but how easy can you find what you’re looking for? Slot sites with a filtering system are preferred as it’s simple to find slots by a certain provider or by a theme for example.
If you take SlotsMillion Casino (again), they have a very clear website (with works perfectly on mobile/tablet devices). Their clear filtering system is the best we’ve come across as you can view slots by:
- Type: classic, new, video, 3D or jackpot
- Software: click on the desired provider(s) to show all their games
- Theme: choose from mythology, movies & TV, sci-fi, sport and many other options
- Features: select Megaways, special wilds, win both ways + tumbling reels for example
- Paylines: choose from 1-15, 16-25, 26-50 or 51+ ways to win
Another honourable mention is Casino Gods which allows you to also view slots by provider.
Payment Methods
Playing slots online is all well and good but you need a payment method to deposit funds at play them for real. Slot sites with a wide range of payment options is what you want. It also shows credibility.
The most popular deposit and withdrawal options are debit cards, PayPal, NETeller and Skrill. The top slot sites will offer all these as well as newer payment methods.
With a rise in mobile and tablet play, there’s been an emergence of newer payment methods like Apple Pay, Boku and MuchBetter which are all mobile-friendly methods. They allow players to deposit quickly and securely from their handheld devices.
With Apple Pay for example, there’s already a debit card account connected. The user can use Apple Pay at a slot site and not have to enter their card details. If you use Boku, the deposit amount is taken from your mobile phone bill. Having options is ideal as customers can play on the go and not have to enter card details.
A good example of slot site with a wide range of payment methods is Paddy Power Casino who also allow you to cashout via their many betting shops throughout the UK.
Types of Slot Games Available Online
Now you’ve found a slot site to play at, you may want to know what types of online slot games they have to play. You may be testing the waters and only played slot machines in a pub or arcade before.
The most common type of slot game are video slots. You also have jackpot slots, Megaways slots and now Megaclusters slots. Let’s look a little closer at what this means for you:
Video Slots
This is the most common type of slot game found at slot sites. Video slots normally have 5 reels and between 10 and 50 paylines. Winning combinations are formed from left to right and they come with bonus features including free spins, pick me style games and wild symbols.
Jackpot Slots
Popular with players, jackpot slots are video slots that give you the chance to win jackpots. Whilst there are different types of jackpot slot games, there are many fixed jackpot games which offer fixed sums of £5,000 for example.
The best jackpot slots are progressive as they offer life-changing amounts which increase infinitely. The largest ever online jackpot came from the Mega Moolah slot and was €18,915,872.81. For more information, here’s a list of all jackpot slots.
Megaways Slots
Created by Big Time Gaming, the Megaways engine was first introduced when they released the Dragon Born (Megaways slot). However, it was the release of the Bonanza Megaways slot that propelled the innovative engine into the limelight.
The concept is simple. On each spin, every reel can contain a random number of symbols. The more symbols per reel, the more ways to win. Megaways slots also come with bonus features such as cascading reels, free spins, wild multipliers and even progressive jackpots.
Since then, Big Time Gaming has created many more Megaways slots. More importantly, they have licensed the engine/mechanic to other slot providers. The likes of Blueprint Gaming, iSoftBet, NetEnt, Fantasma Games and NextGen Gaming all have their own Megaways games with well over 100 now available. For more details on the innovative mechanic and a list of all games using it, check out the Megaways slots section.
Megaclusters Slots
Another mechanic developed by Big Time Gaming, Megaclusters debuted with the release of the Star Clusters Megaways slot. Megaclusters takes the Cluster Pays mechanic one step further and replaces a winning symbol with more symbols. This increases the number of symbols in play and the number of ways to win. Check out our Megaclusters slots guide for more information.
Classic Slots
Classic slot games have been around longer than the internet has. This is why they are still very popular today. Known as slot machines or one-armed bandits, they are normally 1 or 3 reel slots with a limited number of paylines.
Players who have played in land based casinos, arcades or pubs will recognise these classic slots straight away. Whilst technology has moved on and there are so many more advanced slot mathematics and engines available, the nostalgia of classic slot games has not died away.
You have providers like ELK Studios who are taking classic slots and adding a modern twist to include bonus features like free spins, multipliers and cascading reels.
Slot Sites FAQs
This depends on your personal preferences as a player. Our expert team follows strict criteria when reviewing slots sites including slots offering, bonuses, payment methods and withdrawal times, customer support and reputation/licensing. Check out our top 10 slot sites for UK players.
Yes. All slot sites having a mobile version meaning you can play your favourite slot games on smartphone and tablet devices. The best mobile slot sites have dedicated apps for iOS and Android devices.
Yes. Most welcome offers have deposit bonuses where wagering on slot games is 100%. Also, many slot sites offer free spins on their most popular slots. Ongoing promotions are centred around slots too with many top slot sites hosting slot tournaments frequently.
Yes. All slot sites on our list have an operating license from the UK Gambling Commission meaning they have to follow strict rules and regulations in order to offer a safe and enjoyable place to play slots online. All the slot games are audited for fairness and offer the RTP advertised.
Yes. Whilst some sites are dedicated to online slots, most UK slot sites have other casino games like blackjack, roulette and video poker. However, bonuses and promotions will be focused on slots as they are the most common type of casino game found at casinos these days.
