Best Online Slots in the UK - Top UK Slot Sites With High RTP Games

Looking for the best online slots in the UK? Checkout GamingGram’s list of what they believe to be the best UK sites

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Thursday, 31st March 2022, 12:01 pm

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25 Best Online Slots UK players should try - top slot sites rated by high RTP games, free spins, promos and more
25 Best Online Slots UK players should try - top slot sites rated by high RTP games, free spins, promos and more

Online slot games have increasingly become popular in the gambling industry. The excitement it brought to the players shows no sign of slowing down on the horizon, but what are the best online slots in the UK and how do you find them?

GamingGram has listed the 25 best UK slot sites below. They focused on all the important factors that gamblers care about: availability of games, special offers, payment options, mobile experience, and many more criteria.

Best Online Slots in the UK

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Mansion: Best UK online slots overall

Grosvenor: Most popular online slot casino

mFortune: Top-notch unique gaming portfolio

CasinoLab: Excellent customer support

PlayOJO: Highest number of slots

1. Mansion - Best Overall Online Slots in the UK


Innovative payment methods to choose from

Massive selection of casino slots and jackpot games

Responsive customer support

Separate bonus for high-rollers


Minor software glitches

Slow withdrawal process

Monthly limitations on withdrawals

With the support of the most renowned developer in the world, Mansion Casino has introduced to the public a vast selection of games that is hard to beat by other casino websites, especially their slot games from Playtech.

It also offers various bonuses and rewards, alongside its security measures to protect you and other players.

Bonuses and Rewards: 5 / 5

Mansion Casino boasts generous bonus offers and rewards. Still, always make sure to check the T&Cs and see what conditions are attached to them.

When you sign up and make a deposit, you get a welcome bonus package consisting of two deposit match bonuses. Promos for the existing players frequently include free spins bonuses, which again puts Mansion above many other UK slots sites.

Game Selection & Variety: 5 / 5

Mansion casino is home to about 1280 casino games.

Once you log in to your account, you’ll enjoy a variety of games, including over 822 slots, which are primarily based on popular TV shows and classics like fruit and ancient-themed games.

Playtech has provided a diverse selection of games at Mansion, including online slots machines like Whited King and Great Blue.

Among its top slot games, we liked Pride of Persia Empire Treasures, Red Wizard Fire Blaze, Bigger Bass Bonanza, and more.

If slots are your cup of tea, this casino site is best for you. But if you want to indulge in something new, Mansion casino offers various table games with multiple versions of blackjack, roulette, baccarat, craps, and poker.

Live casino games and live blackjacks are also the fan-favourite and go-to options at Mansion Casino.

Deposit & Withdrawal Options: 4 / 5

When it comes to payment methods, Mansion casino has a decent list of ways to fund your account.

Users can deposit and withdraw funds using bank transfer, Paysafecard, debit card, ecoPayz, PayPal, Neteller, EntroPay, and Boku.

If you want to withdraw your winnings, note that it takes 3 to 12 working days, making it slower than the other casinos.

Furthermore, Mansion casino offers players deposits in various currencies, including Great British Pounds and Euros, Canadian Dollars, Swiss Francs, Hong Kong Dollars, Danish Kroner, Japanese Yen, New Zealand Dollar, and more.

Hence, if you plan to choose Mansion casino, you have the leeway to select from any of the following.

User Interface: 4.9 / 5

You'll find the Mansion casino's website appealing because of its classic casino theme.

To top it off, it has useful menus, pages, and sections that allow you to navigate through games effortlessly.

Although it doesn't come with a mobile app, you can still play casino games anywhere you are using your smartphone's web browser.

Sadly, you may experience some interruptions during your gameplay on the phone.

Customer Support: 5 / 5

With Mansion's 24/7 live chat you'll get all your urgent and non-urgent concerns answered instantly.

This online slot casino has also listed its needed contact details on its website to let you reach them without any problem.

You can talk to their customer support through phone and email on top of their live chat feature.

2. Grosvenor - UK’s Most Popular Casino Site


Supported by IGT and other top developers

Offers big loyalty program

Has 659 overall casino games


Table games need improvement

Limited welcome bonus

Payment methods take time to process

Grosvenor Casino has been part of a large gambling firm around the UK. For over a decade of its operation in the gambling industry, it became one of the most popular casinos today.

It has an extensive gaming portfolio that is associated with Mecca Bingo and has grown to include slot games, which come with a unique approach supported by various providers, including IGT, NextGen Gaming, Microgaming, and Playtech.

Additionally, Grosvenor casino comes with some progressive jackpots, poker games, baccarat, etc. With this, it's not a surprise if this brand tops the most popular casinos within the UK.

Bonuses and Rewards: 4 / 5

Like any other casino site, Grosvenor casino offers various bonuses and rewards, attracting every player’s attention.

However, the maximum welcome bonus of this casino is somewhat less generous. Despite this limitation, it has an extremely small wagering requirement of 5x. That’s one of the lowest playthrough conditions you’ll see anywhere.

The good news here is that Grosvenor is quite impressive when giving rewards to their loyal players.

If you are one of them, you can expect to receive exciting rewards, like free spins and extra money, in your inbox once a month.

Plus, Grosvenor casinos’ collection of slots comes with a unique method. You can type on the search bar on whatever progressive slots you’d like to find.

One of the most popular and the big ones from Microgaming and the well-known game title here is Mega Moolah. This game is quite known for giving big-shot jackpot prizes.

Game Selection & Variety: 4.5 / 5

Grosvenor casino has a massive collection of games to offer, with over 659 casino games from the most reliable and renowned suppliers. If you are fond of playing slots, they’ve have a lot to give.

There are 610 overall slots, and they are all classics, including Wildfire, Lady’s Charm, Cleopatra, and the big jackpot game, Mega Moolah.

Apart from these, Grosvenor offers other games, such as the host of branded games, including Wheel of Fortune, Games of Thrones, Austin Powers, Michael Jackson, and Monopoly.

These slot games are created with creative graphics from the best software providers.

It also provides a wide range of video poker, table poker games, and live casino dealer games. However, their table games aren't fully developed yet to let them work more efficiently.

On the other hand, you can browse through its arcade games to play, including Bouncy Balls, Virtual Horses, and Deal or No Deal. All of these have incredibly high standards that you may select from.

Deposit & Withdrawal Options: 4 / 5

As an established gambling brand in the gambling market, Grosvenor offers a variety of methods to deposit and withdraw payments.

Since it is not available for all, it no longer accepts credit cards, such as Mastercard or Visa Credit. Instead, you can use Solo, Switch, Maestro, Delta, and PayPal.

Aside from this, you can also use other methods, like Laser, Neteller, Skrill, and Bank Wire.

However, payment methods usually take time to process for up to 3-5 days. Given this, you have to wait a bit longer before everything is finally settled.

User Interface: 4.9 / 5

You can get the best of both worlds with Grosvenor's desktop and mobile casino versions.

Both gaming methods have a user-friendly interface to let you browse through its wide game selection easily.

While it's not much of a deal to some players, this casino's only downside is its limited language preference.

Customer Support: 4.8 / 5

You can expect quick and reliable answers to your concerns with Grosvenor's excellent customer support team.

They're available 24/7 through email and their live chat feature.

On top of that, they also have a phone hotline. However, only their live chat feature guarantees instant answers.

3. mFortune - Best Site for Exclusive UK Slots


Effective customer support

Unique gaming portfolio

Offers two different welcome bonuses.

Refer-a-friend bonus


Limited games selection

Outdated design

mFortune boasts an impressive gaming portfolio provided by Intouch Games.

Before a game starts, you’ll be given an information sheet of what you need to know. Hence, we can say that mFortune runs its operation uniquely in the gaming industry - and it’s got a bunch of exclusive titles to offer.

Bonuses and Rewards: 5 / 5

mFortune strives harder to offer all new players exciting welcome bonuses and you can also grab free spins on the regular.

All you have to do is sign-up and complete all the details asked. If you are ready to make your deposit, you’ll be given a match bonus and additional free spins.

If you’re an existing user, you can take advantage of giving referral codes to your friends.

You can also participate in game of the month promotions, which will give you the opportunity to receive locked free spins and other bonuses.

In slot games, there are various slots that have progressive jackpots. If you want to try your luck for a bigger reward, we suggest Cat & Mouse, a high-RTP progressive jackpot slot game.

Game Selection & Variety: 3.9 / 5

mFortune has only 60 casino games available, including bingo, blackjack, and roulette – which is not going to impress many players.

So, if you want to play all those popular slots found on the market and you’re looking for quantity, this platform is not the best place for you.

However, if you’re already worn out of those common games offered by larger casinos, mFortune’s game selection might just be perfect for you. On this website, you’ll find many casino games you probably have never played before.

On top of that, you can also try its poker game, which is designed as the classic version of Texas Hold ‘em and allows up to 8 players on a virtual table.

Above all, you can still have fun at mFortune casino despite having limited games to offer.

Deposit & Withdrawal Options: 5 / 5

mFortune provides various ways to deposit funds, including Paysafecard, PayPal, debit card, skrill, and phone credit/bill.

If you’re ready to make a deposit, just head over to the banking section on their website and follow all the provided instructions.

The same applies when making withdrawals. Just go to their website’s banking section, and you can withdraw your money through debit card, PayPal, and direct bank transfer.

For a faster withdrawal process, you may use e-wallets like PayPal. However, for other payment methods, there is no guarantee that it will also provide secured and fast transactions.

Despite this, mFortune tries its best to process your withdrawal request as early as possible.

User Interface: 4.5 / 5

Regardless of your device, you can easily access mFortune on its desktop and mobile app.

Its website also contains dropdown menus that make its entire layout and interface more organized and appealing.

The only missing thing on this online slot is a search bar that could take you to your chosen game instantly.

Customer Support: 4.7 / 5

Going to mFortune's website will grant you access to its existing customer support platforms.

You can reach out to them through email or phone for your non-urgent inquiries.

The only caveat is that they may take a while to reply. But you also have the option to talk to an agent and get instant and reliable replies on their 24/7 live chat feature.

4. Casino Lab - Great Choice of UK’s New Slot


Wide range of live dealer games

Live chat is supported by multilingual support agents

Over 1000+ slots games


Slow verification process

Has withdrawal fee

No bonus code

Casino Lab online casino has been operating since 2020 by Genesis Global Limited.

It features a load of games from various renowned providers, which are now enjoyed by thousands of users from different parts of the world.

Along with its keen desire to give enjoyment to its users, Casino Lab also provides effective customer service with multilingual customer agents to ensure that all concerns and questions raised by their players are well-addressed efficiently and adequately.

Bonuses and Rewards: 3.5 / 5

Aside from having more than 1000 online casino games offered by Casino Lab, this site also offers multiple bonuses and rewards both new and existing UK players may receive.

For instance, by signing up at the Casino Lab, you can receive a standard deposit bonus and free spins.

These rewards will be available to you instantly. The first 30 spins will be given within 24 hours, and the rest of the spins will be credited in batches of 30 each day.

Note that there is no bonus code available for the offer above. Thus, the only thing you can do as a UK player is to make sure you select the offer and make the minimum deposit as stated in the given terms.

Game Selection & Variety: 5 / 5

Casino Lab offers an overall 1848 casino games – most of which are slots such as Cluster Tumble, Big Bad Wolf Megaways, Moon Spirit Hold & Win, Big Juan, 90K Yeti Gigablox, Hypernova 10K Ways, Gems Infinity Reels, and many more.

But if you’re not a fan of playing slots, you can also enjoy playing other games, including jackpots, live casino, live roulette, roulette, table games, blackjack, and so on.

It also boasts a demo mode that lets you play the game before spending real cash. This way, you can check if the games are worth the risk or best-suited to bet your money.

Deposit & Withdrawal Options: 4 / 5

Like any other big-time online casino, Casino Labs offers a wide range of payment methods, such as Boko, ecoPayz, Paysafe, Skrill, Neteller, MasterCard, Visa, and more.

The minimum deposit and withdrawal amount is £10, and its maximum ranges from £1900-£2300 per transaction.

Note that its withdrawal time takes 72 hours to be processed. On top of that, withdrawals come with a fee of 2%, which applies to all transactions.

If you want to close your account, your balance will be deducted at a 3% fee. So, you have to be mindful of all these standard fees before your deposit and withdrawal.

User Interface: 4.6 / 5

One missing feature of Casino Lab is that it lacks an available mobile app. That's a big letdown, especially if you want to play their games on the go.

But to make up for that loss, you can still access their library on your phone's web browser. It just won't give you the best overall gambling experience.

Nonetheless, Casino Lab's website has an attractive design. It also stands true to its name because of its one-of-a-kind science theme.

On top of that, it has an organized layout for easier navigation through its games, promos, and a lot more.

Customer Support: 4.5 / 5

Compared to other online slots, Casino Lab utilizes three means to reach out to their customer support.

You can ask them your concerns on the phone if you're on the go, but you can also get their replies through email.

However, both these options may not guarantee quick responses.

5. PlayOJO - Highest Number of UK Slots


Has over 3,000+ slot games

Topmost site security

Excellent Slot Game Filters


High minimum withdrawal amount

Poor performance of Table Game & Video Poker Sections

Slow live chat response

Since 2017, PlayOJO has strived against the odds to provide the best of the best casino games with a wide range of selections.

Throughout the years, it became pretty successful in establishing a massive number of slot games, with 3,000 overall. Thus, UK players have a leeway in choosing which slot suits them and are worthy of investing time and money.

Bonuses and Rewards: 3.5 / 5

Play OJO offer spins to boost your first deposit - and the best thing is that they come with 0x wagering requirements.

And if you win on these spins, it’s all yours to keep with no other hidden factors attached to it! You can have one spin for every pound you deposit for up to 50 maximum.

You can use this bonus on slots. On the other hand, some casino games, like video poker, contribute a small amount towards your OJOplus balance.

Game Selection & Variety: 4 / 5

PlayOJO offers a wide range of game selections. With its over 3,000 casino games, UK players have plenty of options to decide what games they prefer to play.

The majority of PlayOJO’s games are slots, including Vikings Go Berzerk, immortal romance, thunderstruck II, and Asgardian stone.

There are also other casino games, such as baccarat, dream catcher, casino hold 'em, and more. You can find different loads of table games too.

Deposit & Withdrawal Options: 3.5 / 5

PlayOJO offers several banking options and payment methods to choose from. Almost all their payment methods are free, except from Skrill and Neteller, which charge up to 3-5%. But in all cases, it has a £10 minimum deposit.

The minimum for withdrawals is £20. However, if you’re withdrawing through wire transfer, the minimum increases to £50 with a £10 fee, making it quite a high standard for most players. On top of that, you also have to pay a fee if you withdraw more than £500.

Note that withdrawal using e-wallets will arrive on the same day of your request, but if you’re using a card or wire transfer, the process could take about 2 to 7 business days.

User Interface: 4.6 / 5

PlayOJO ensures you get an excellent gambling experience in their online slot.

It has a plain and simple layout and design that may come off dull compared to other existing casinos.

Nonetheless, you can easily browse its game library using its filter feature.

Sadly, you won't have the option to download PlayOJO because it lacks mobile support.

Although you can play their games on your phone's browser, you may experience glitches and a slow response time that could interfere with your overall gameplay.

Customer Support: 4.4 / 5

While there are two ways to contact PlayOJO's customer support team, you'll have a hard time actually reaching out to them.

Their existing live chat feature is only available from 6 AM to 12 MN. That means you'd have to wait during this timeframe to ask their team your concerns.

Additionally, PlayOJO has an available email on its website. But it may take a while for your questions to get answered.

They also don't have a phone hotline if that's how you prefer contacting them. Nonetheless, you can check out their FAQs while waiting for their replies.

6. Magic Red

Flexible payment methods

Has over 1,327 casino games

Fast payouts

Offers 947 casino games

Monitored by the UKGC

Excellent range of payment options

Great welcome bonus

Impressive customer support

Regulated by the UKGC

Great free spins promos

Impressive selection of progressive slots

Wide range of banking options and payment methods

60+ games

Play for free option (demo slots)

High-quality live dealer games

Compatible in flash version and mobile devices

Weekly spins bonuses

Great user interface

With over 3000+ casino games

12. Pelaa

UKGC license


SSL encryption

Great jackpot games

Has 1,700+ casino games

24/7 customer support

3,500+ casino games

Accepts PayPal for depositing

24/7 customer support

Fast withdrawal time

Wide range of payment methods

Home to leading software providers

16. Spela

Can play without signing up


Has over 1680 casino games

17. FunBet

Compatible with mobile and tablet devices

Great customer support

Big welcome bonuses and promotions

Sleek user interface

Good free spins promos

Has over 1100+ casino games

Great design

Has over 1000+ casino games

Wide ranges of payment methods

Reliable software

Swift customer support

Has over 1193 casino games

New UK slots regularly added

Massive game selection

Offers 1132 casino games

Great customer service

Has exclusive slots


23. Cashmo

Wide ranges of payment methods

UKGC Licensed


Great bonuses

Fast withdrawal time

Low wagering requirements

How GamingGram selected the best online slots in the UK

Bonuses and Rewards:

One of the most exciting parts of playing in online casinos is the number of bonuses and attractive rewards players can get from them. So, it is one of the essential features we look up to in selecting the best online slot website.

Game Selection and Variety:

Aside from its bonuses and rewards, we also ensure that all online slot sites we review offer a wide range of game selections players will surely enjoy. That gives you endless options to choose from, especially if you're unsure about what to play.

Deposit and Withdrawal Options:

We added this factor to the list to ensure every player knows how the deposits and withdrawals work for each casino site. We also give strong preference to those with a wide range of banking options and payment methods, as well as those who have fast withdrawal times to ensure an overall gaming experience.

User Interface:

An online slot's user interface is one of the crucial features that we looked at. If a casino's website is a bit over the top, it may look unorganized and unappealing. That may confuse and overwhelm both existing and new players. Additionally, we also considered whether there was an available mobile app to ensure an ongoing gambling experience.

Customer Support:

We also considered whether the online slots in this list have a reliable customer support team. Since it's inevitable to experience issues during a game, we checked these casinos' response time, quality of answers, and the number of ways to reach out to them.

Best online slots in the UK: frequently asked questions (FAQs)

Are Online Slots Legal in the UK?

The online slots sites on this list are legal and regulated by the proper authorities in the UK. That means they come with the appropriate licenses and certifications to operate nationally. They also have random number generators to ensure that all their games are fair.

Are Online Slots Safe to Use?

Since these online slots have the appropriate licenses and certificates from national authorities, they're completely safe in the UK. They also have strict security measures and terms and conditions to ensure that you get the best gambling experience. Make sure to check these factors out first or you’ll be at risk of losing your money to scams.

Are Online Slots Worth Playing Compared to the Real Slot Machines?

If you're looking for convenience, online slots are undoubtedly worth considering. They allow 24/7 access to their games without you going to an actual casino. They also offer an impressive selection of games and slots with progressive prizes. To top it off, some casinos in this list have demo games that let you play without using real money.

How to Get Started at Playing Online Slots in the UK

Slot machines are undeniably one of the most popular games at every online casino. To get you started, follow the steps below:

Step 1. Create an Account.

To get started, head over to the casino homepage and click "Sign Up."

Step 2: Fill Out Your Personal Information

Fill out the required personal information. (Double-check your details before submitting).

Step 3: Click REGISTER

Click REGISTER located at the bottom of the page.

Step 4: Create a Strong Password

You will be required to create a strong and unique password based on their security requirements. Once done, click CREATE.

Step 5: Make a Deposit

Lastly, to set up your account, you'll need to choose a payment method and fill out your financial information. After that, click DEPOSIT, and you're good to go!

Wrapping Up on the Best Online Slot Sites in the UK

We hope our comprehensive list of the online slots in the UK helped you decide which casino you should go for. For a great online gambling experience, we made sure that each of the online slots mentioned is perfect for every type of player out there, and is more than enough to satisfy their gaming needs.

Whether it be Mansion Casino or PlayOJO, GamingGram says: “We are proud to say that we stick with the best -- and so should you!”

DISCLAIMER: We always emphasize that gambling is purely for entertainment purposes. It comes with financial risks and you must not stake any funds you cannot afford to lose. It’s helpful to remember that when it comes to gambling, the house always wins!

Be vigilant. If you suspect you may be developing an addiction or if you know anyone who is, call the National Gambling Helpline at once. You can reach their advisors at 0808-8020-133 who can offer assistance to make gambling a safer venture for you.

Gambling sites are strictly 18+ only. Some gambling sites listed on our site may be restricted in your region. It’s always a best practice to do your due diligence and check local laws and regulations to check if gambling is legal in your area. The reviews published on our site are 100% independent and reader-supported. We may receive commissions for recommendations we mention. This has absolutely no bearing on our testing and evaluation process. All reviews are conducted to provide our readers with all the information they need to have the best gambling experience.

These resources offer invaluable information to help prevent or eliminate gambling addiction: