Best Slot Sites: 2021 Edition

The best of the new slots sites are licensed by reputable agencies. They feature logical designs, lucrative bonuses, lots of games to choose from, flexible banking options, effective security measures, and excellent customer support. Let’s find you one!

Best Online Slots in the UK

Key Features
Welcome Bonus
Mansion Casino
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Perfect website security

24/7 customer support

Easy to navigate

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New customers only. Minimum deposit £20. Maximum bonus £200. Wager 40x before withdrawing. Game weighting applies, see below table. ID must be verified prior to participation. Payment Method Restrictions apply. Bonus betting limits: Slots – £5 All other games – 10% of bonus amount. Not available on iOS app. Full T&C apply.

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Multiple banking options

Helpful customer support

Fun game selection

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*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 & PayPal deposits only. This offer is valid for 7 days from your new account being registered. Irregular gameplay may invalidate your bonus. Terms Apply.

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Live casino

Multiple language support

Mobile support

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The Welcome Bonus is open to new customers who are aged 18 and over. Once you have made your first qualifying deposit, please accept or decline your bonus in the pop-up notification window before playing the casino games. Your Welcome Bonus will then be credited to your account immediately. The minimum single deposit to claim this bonus is £20. Your Welcome Bonus is a redeemable casino bonus. To redeem this bonus, you must wager a minimum of 40 times the bonus amount. Full T&C apply.

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Generous bonuses

Intuitive website design

Fast withdrawals

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*18+. New UK customers only. Opt-in required. 30 bonus spins on Book of Dead game upon registration. 100% deposit bonus up to £300, min deposit £10. 30x wagering requirements apply (game weighting applies). Max bonus bet £5. T&C’s apply. Please gamble responsibly, • Bonus terms

Paddy Power
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Exceptional welcome bonus

Great user experience

Constant promotions

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All Paddy Power Games NEW CUSTOMERS can receive 100 Free Spins on our Daily Jackpots Slots Collection once they Opt In and complete the steps outlined below. Plus, once you claim your 100 Free Spins, you can also earn an additional 100 Free Spins on Daily Jackpots when you opt in from the promo hub, deposit and bet £10 on any game in the Daily Jackpots collection.

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Fast withdrawals

Good welcome package

VIP rewards

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To be eligible to claim the New Player Welcome Bonuses, players must deposit a minimum of $10 in one instance, for each bonus. Players need to wager the first four Welcome bonuses 40 times before they can withdraw the Bonus or any winnings gained from them. All Free Spins from the New Player Welcome Bonuses are valid for 72 hours upon activation, unless otherwise stated. The maximum withdrawal amount for a player from their Free Spins is $100.

William Hill
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Reputable website

Great promotions

Varied banking options

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You need to opt in to be entered into the free-to-play tournament. Tournaments will run every day. See the individual tournament for the start time and the length of the tournament (the promotion period). The tournaments are only available on the game shown for the tournament you opt in to (the promotion game). Full T&C apply.

777 Casino
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Multiple language support

Optimized for both mobile and desktop

Excellent selection of slots

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New players only • No Deposit Offer: Claim in 48 hrs • 14 day expiry • Free Spins (FS) wins credited as bonus & capped at £10, exc. JP win • Deposit Bonus Offer: FreePlay (FP) wins credited as bonus & capped at amount received, exc. JP win • Valid for selected games • Bonus wins capped at £500 • 50x wagering – req. vary by game • Bonus expires within 90 days • Withdrawal restrictions & T&Cs apply: No Deposit Offer & Deposit Offer

The Best Slot Sites for 2021

  1. Mansion Casino (Best Playtech-Powered Site)
  2. Betway (Top Microgaming Site)
  3. (Best No-Wagering Bonus)
  4. Casumo (Best NetEnt Site)
  5. Paddy Power (Best UK Site)
  6. Sloty (Best Welcome Bonus)
  7. William Hill (Best Known Casino Website)
  8. 777 Casino (Best NoLimit City Site)

Reviews of the Top UK Slots

mansion casino logo

Great game selection

Fast withdrawals

Good high roller bonus

Mansion Casino is based on Les Ambassadeurs Club, a luxury gambling house in London’s Mayfair district. Founded in 2004, Mansion is a veteran in the online gambling business. Licensed by the UK Gambling Commission and powered by Playtech, Microgaming, and other giant software providers, Mansion Casino is one of the best slot sites for winning big. 

Mansion tops the charts when it comes to user experience. The design of the site is a trend-setter for the competition, the interface is intuitive and easy to use, and both casual players and high rollers will find their way around with no problems.

Mansion Casino’s welcome bonus is generous; the site offers a 100% match bonus up to £500. Sadly, there are no free spins for new customers, but the welcome bonus is still a candidate for best slots bonus in the UK.

Wagering requirements are tougher to meet than at most casinos. You must wager your bonus amount 40 times before requesting a withdrawal of bonus winnings.

If you don’t have a favourite game you play consistently and you like to explore the options, Mansion Casino is the place for you. New slots, legendary slots, progressive jackpots – Mansion Casino has it all.

Banking options are another reason Mansion Casino is one of the best slot sites online in the UK. The site supports PayPal, paysafecard, and debit cards. Deposits are lightning-fast, which is always a plus.

Mansion has customer support agents available on live chat and telephone from 8 a.m. to 11 p.m. UK time. You can also send an email and receive an answer promptly.

All in all, Mansion Casino is surely a fantastic opportunity for every UK-based player.

betway casino logo

Established brand name

Huge fan base

Easy website navigation

Betway is one of the most famous names in the world of casino gaming and sports betting. Founded in 2006, Betway consistently offers gamblers access to the top slots in the UK.

When you’re gambling at an established site like Betway, there’s no reason to fear that the casino isn’t trustworthy or safe. You also get the best possible user experience, an updated and fast site, an intuitive interface, and optimisation across all platforms. With Betway you can play your favourite slots on Windows, macOS, iOS, and Android – anywhere you want, whenever you want.

Betway’s welcome bonus will surely catch your attention. It’s a 100% match up to £50, which makes Betway one of the best slot sites in the UK with a bonus. You can choose from 400 slots to wager your first deposit, which gives you a realistic chance to earn lots of money.

On the other hand, wagering requirements are not that great. You must wager the deposit and bonus amount 50 times before withdrawing the bonus and any winnings you’ve earned with it. That’s a tough but not technically impossible task. Choose the online slot machines with the best RTP and try to gain an advantage over this offer.

If Betway’s wagering requirements are disappointing, its banking options will surely excite you. Visa, Mastercard, PayPal, Neteller, Skrill, paysafecard, Entropay, and bank wire transfers are all available, fast, and secure. This is one of the reasons Betway belongs on any list of the UK’s best casino slot sites.

Betway is an old-school company that understands the importance of customer support. Agents are available 24/7 via live chat, email, and telephone. We found the agents fast, knowledgeable, and professional. It’s a joy to talk with them and they will solve any issues you have with the site.

casino-com logo

A bunch of bonus spins

Constant promotions

Great user experience

Remember when short, uncreative URLs were worth a fortune? is an active relic of those days. Today, is operated by Mansion Europe Holdings in the UK, which runs some of the UK’s best bingo and slot sites – including Mansion Casino.’s user interface is perhaps a little bit dated – the overall design of the website has barely changed over the past 10 years. Nevertheless, the site works great on all devices and the interface is a breeze to navigate.

The welcome bonus is great for both casual players and high rollers. The site matches your first deposit 100% up to £400 and throws in 220 free spins. As if that weren’t enough, is one of the few online slots with no deposit required in the UK for a bonus. The site gives new users 20 free spins with no deposit. You can use them at more than 300 slot games at

Wagering requirements for the 100% matched bonus: 40 times. The no-deposit bonus follows the same rules unless some special conditions are triggered, but the winnings derived from it are capped at £200.

Like most of the industry’s big names, supports almost every payment method. You can deposit funds with your Visa, Mastercard, or Maestro card; e-wallets such as Skrill, Neteller, PayPal, or paysafecard; or wire transfer. These options earn a place on the top 10 slot sites list. has stellar customer support. Agents are available 24/7 via live chat, email, and telephone. It’s a free call from anywhere in the UK.

We fully recommend this giant to everyone. Casual players and high rollers alike can find great slots that suit their style – not to mention a hefty 100% match welcome bonus and a generous no-deposit offer. It’s no wonder is widely regarded as one of the best deposit-bonus slots sites.

casumo logo

Unique gaming experience

Good welcome package

Helpful customer support

We don’t consider Casumo a veteran in the online gambling field, but the site certainly isn’t new. Casumo Casino has been in business since 2012. 

Unlike many of its competitors, Casumo clearly pays attention to details. The website’s design is one of the cleanest and simplest in the industry, and the company has pledged to create the best gaming environment for customers. These efforts mark Casumo as one of the industry’s best online slot machine sites

The interface is easy to use and easy to get used to. It doesn’t matter what device you play on – everything loads quickly and works smoothly. Thanks to this excellent UX, you can stop wasting time finding the perfect game and simply enjoy yourself immersed in Casumo’s excellent slots.

When it comes to slot games variety, Casumo definitely has some of the best slots to play online. There are more than 1,500 slot games on the site, which makes it a fantastic partner for every casual gambler who wants to try out their luck by playing many slot games.

Casumo’s welcome offer is generous – a 100% match of your first deposit up to £300. You can claim a no-deposit bonus as well – 30 free spins on Book of Dead. This is a great offer, because Starburst is one of the most popular slots at the moment, and one of the best paying online slots for sure. 

Casumo is famous for its low wagering bonus requirement – only 30 times! Easier wagering makes up for a slightly lower welcome offer compared to other online casinos.

All deposits and withdrawals are free of charge at Casumo, and every major payment processor is supported. You can make a deposit with debit cards, Skrill, Neteller, and PayPal instantly. Bank transfers take up to three business days.

Casumo customer support is a bit disappointing. Agents are available via chat and email, but not telephone. That’s a problem, because in the UK live phone support is very important. However, that doesn’t mean that Casumo is not among the best UK online slot sites.

We fully recommend Casumo, especially for its catalogue of 1,500 slots and low wagering requirements for bonuses.

paddy power logo

24/7 customer support

Varied banking options

Trustworthy brand

Paddy Power is a well-known UK-based provider of both betting and casino games. It is one of the most popular bookmaking companies in the country, with numerous land-based betting shops in every major city.

The online version of Paddy Power has been around a long time too. It was launched in 2004. We’re talking about one of the best slot gambling sites not only in the UK, but across the world. The site has been modernised several times over the past 15 years, but it is still more traditional than modern. The site has apps for iOS and Android devices, however, which makes up for a lot.

Paddy Power’s bonuses are worth considering if you’re registering a new account at the site. There are numerous welcome offers and bonuses, and you can even claim a no-deposit bonus of £10, which puts Paddy Power among the rare slot sites with a free sign-up bonus.

The welcome bonus is split into three parts. Your first deposit is matched 100% up to £200. The second is a matched bonus up to £100, and the third is the same as the first – 100% match up to £200. There are only a few casino sites on the internet with this generous a welcome offer. If you like bonuses, Paddy Power is your go-to place, with potentially the best online slots bonus out there.

Paddy Power’s wagering requirements on bonuses are among the lowest in the industry: 20 times. So even if Paddy Power were a new and completely unknown casino, it would be worth checking out just because of these great offers. And when you have a brand name that has been around for decades, completely trustworthy and well-known, you know you are at one of the best UK online slot sites. There is no doubt that Paddy Power is one of the best slot sites with no wagering in the UK.

Paddy Power has nearly 150 slots, and there’s a good chance your favourites are among them. There’s no shortage of options to choose from: classic, old-school, new additions, jackpots, progressive jackpots…plenty of options to satisfy your preferences.

Paddy Power accepts debit cards, wire transfers, Neteller, Skrill, paysafecard, and PayPal. The greatest thing about Paddy Power banking options is that all deposits except for wire transfer are instant. The minimum deposit is just £5, which is fantastic for casual players. You can withdraw as little as £10 with any payment method, and you’ll wait for just a few hours if you use e-wallets such as Skrill, Neteller, and PayPal. That’s another reason Paddy Power belongs on our best slot game sites list.

Paddy Power has all popular customer support options listed on the site, although some of them are fairly well hidden. First you must scroll through the FAQ page to reach the “customer support specialist” section. The page was designed that way for a reason: Most problems can be solved easily if you just read the FAQs. If you can’t find an answer on the site, you can contact Paddy Power support via phone or live chat, both of which are available 24/7. For these reasons, it’s no wonder Paddy Power is one of the best online slot sites in the UK.

sloty logo

Optimized for mobile

Beautiful website design

Constant promotions

Well here’s something different. Most of the sites we’ve covered so far are veterans of the gaming industry, but Sloty Casino has been around only since 2017. Despite being just a few years old, the website has already made its mark on the industry. Sloty may be one of the new slot sites in the UK, but it is challenging even the biggest names in the business.

Sloty’s web design and user interface are nothing short of flawless. That’s not surprising, since the site is fresh and modern. Some old-timers might not like the Sloty look and feel, but younger players will feel right at home. It is both functional and modern.

Sloty’s welcome bonus will leave you speechless. The site offers a four-part bonus that can earn you up to £1,500, and then it tosses in 300 free spins. On the basis of the welcome bonus alone, Sloty surely deserves its place on the list of best slot machine sites in the UK.

When it comes to wagering requirements, you probably won’t be happy. You need to wager the bonus and deposit amount 40 times before you can withdraw bonus funds and winnings. With £1,500 on the table, it’s not surprising that wagering requirements are slightly more onerous than you’ll encounter at other sites. We think Sloty is still one of the best slot sites despite the wagering requirements.

Not convinced? Consider Sloty’s variety of games. The site lets you choose from more than 250 slots plus lots of other casino games. You’ll find everything from old-style three-wheel slots to modern virtual slots with tons of reels and ways to win.

As for banking options, modern sites have modern payment methods. Apart from classic debit cards, you can use Skrill, Neteller, paysafecard, ecoPayz, Entropay, Giropay, Trustly, Sofort, and Zimpler – basically every e-wallet on the market except for PayPal.

Withdrawal options are built around debit cards, Skrill, and Neteller. You can also request a wire transfer, but it is slower and more expensive. Even without PayPal, Sloty is among the best new slot sites for sure.

Sloty customer support is great and the site manages to look modern as well – which is really innovative and actually helpful. Like other casino sites, Sloty has a lengthy FAQ page. If you don’t find an answer there, you can contact customer support agents. Live chat is the default contact medium, but email is also available. The innovation in support is that the Sloty website detects your location and automatically offers you a local toll-free phone number for tech support. How clever!

Sloty is one of the best payout slot sites. Be sure to open an account and claim the wonderful welcome bonus.

william hill logo

Good website security

Helpful customer support

Easy to navigate website

After one of the newest casino sites in the business comes one of the oldest and most famous: William Hill. This venerable brand has been in business since its namesake operated an illegal bookmaking operation on the streets of London a century ago.

The company stuck to bookmaking for decades, launching an online bookmaking site in 1998. The online casino followed in 2000. William Hill is a household name, not just in the UK, but in Europe and around the world.

As one of the best slot sites to win big, William Hill certainly pays close attention to user experience. Although the site is two decades old, it has undergone periodic modernization. The web design is old-fashioned but effective. William Hill doesn’t take the crown for user experience, but it is certainly above average.

William Hill offers a classic 100% matching bonus on deposits up to £300. You must wager the bonus amount 40 times before withdrawing the funds and any winnings that you have made by wagering bonus funds. The cap on bonus winnings is £2,000. William Hill is not among the best slot sites for a no-wagering bonus; all of its bonuses require deposits. Deposits made from e-wallets don’t qualify you for the Welcome bonus or other promotions.

William Hill can’t brag about the variety of games it offers. While other online casino sites have hundreds or even thousands of casino games, William Hill has only about 300 slots games. The list does include all of the most popular and best slots in the UK, however. You’ll certainly have no trouble finding slots to keep you interested and fuel your dreams of big wins.

Although William Hill is an old-school site, it supports plenty of banking options – more than 20 ways to deposit money. We won’t talk about all of them, but we will mention that the most popular and important methods are all supported: debit cards, wire transfer, and e-wallets like PayPal, Skrill, Neteller, WebMoney, Yandex, QIWI, and Apple Pay. This diversity of options helps secure William Hill’s place among the best online slot sites

Customer support agents are available via live chat, phone, and email. They are reasonably fast, and they will always try to assist you.

William Hill has combined its UK bookmaking legacy with modern casino technology to fashion a site that is comfortable for all. Government certification, data security measures, and helpful FAQs are in order. All in all, despite some minor cosmetic flaws, William Hill is one of the best UK online slots

777 Casino Logo

Great website security

Helpful customer support

Provably fair games

Founded in 2015, 777 Casino is among the newest casinos on the market. For some players, that can be a turn-off, but behind 777 Casino stands 888 Holdings, an industry veteran that operates many sites around the world, so you shouldn’t be afraid that you’re dealing with gambling-industry newcomers. These guys know what they’re doing.

That’s one reason 777 earned a ton of industry awards the year it was launched. This isn’t just another new slot site in the UK. It’s one of the best.

The 777 Casino user experience is unique. Although the site is new, 777’s designers seem determined to spark a renaissance of classic slot sites. The result is a design that is an unlikely mix of retro and modern elements. To our surprise, the mix works spectacularly well. This is probably the most original and effective design for a casino website we’ve seen.

777 Casino’s two welcome bonuses earn the casino a solid place among the best online bingo and slot sites on the internet. As a new player, you must choose one welcome bonus or the other. You can’t choose both.

The first – 777 calls it the Welcome Bonus – is a traditional 100% match on your first deposit up to £200. 

The second option is the Welcome Package. It’s a 100% match bonus on your first deposit up to €100 plus 30% matches on your next for bonuses up to €350 each. That’s a total of €1,500.

Both bonuses are subject to wagering requirements and complex terms and conditions.

Slot players will be disappointed with the game variety at 777 Casino, which offers fewer than 50 slots by our count. However, all the most popular and best slots to play are here, including classics like Starburst and Gonzo’s Quest.

When it comes to banking, many sites offer more options than Casino 777. One advantage is that Casino 777 is among the sites that accept deposits and payouts via PayPal. Other options include precisely the banking options you expect: debit cards, Skrill, Neteller, and wire transfer. We rate these banking options above average and confirm 777 Casino’s parent company as one of the best online slot machine website managers. 

Customer support at 777 Casino is good enough. Telephone support is the big priority, and the company does provide toll-free numbers. Second choice is email, as there is no live chat. In our tests, we found the phone operators were prompt and able to answer all our questions.

All in all, 777 Casino is an interesting option for both casual players and high rollers. You might not find the widest selection of slot machines here, but you will likely find the best slot machines – and aren’t those the ones you’re interested in anyway?


Which is the best online slot site?

This question is hard to answer – maybe even impossible. All the sites we list here are the best in some respects and lacking in others. Which is the best overall? There’s only a subjective answer. Maybe you love Sloty’s distinctive design, while someone else would prefer an old-style classic look and feel.

One thing is certain: When you talk about the best online slots, you’re talking about sites that are trustworthy. That’s priority one. All the casinos in this article are trustworthy. We wouldn’t include them otherwise.

A site can have the best welcome bonus with the easiest wagering requirements, but if it’s not legit, you can lose all that money in a heartbeat. Trustworthiness is our top priority, and it should be yours too.

Which slot site has the best odds?

All the sites listed in this article have great odds. Otherwise, they wouldn’t be among the top online slots sites in the UK. Some sites have better odds on progressive jackpot slots, others on regular slot games. Each casino listed here has something special to offer.

Which slot site has the biggest payouts?

That depends mostly on which slots you play. New online slots have better payouts in many cases, because they compete to attract a base of players. Also, sites with higher maximum bets tend to have the biggest payouts.

Can I win real money playing slots online?

All slots online win real money – unless you’re playing in demo mode! Seriously, of course you can win real money playing slots online. It’s important to gamble responsibly and choose the right casino. You can pick any of the casinos we’ve included in this article. They’re the best online slots sites in the UK. However, before playing for real money, we advise you to take a few spins on the demo version. Every great casino site offers demo versions of popular slots so you can try them out and see whether you like them.

What is the best slot game?

Progressive jackpots such as Mega Moolah generally have the biggest wins. However, they also eat up your bank balance pretty quickly with big bets. And you’re competing with thousands of other people.

You can also pick slots with lower volatility and try to win big by amassing a large number of small wins.

It’s worthwhile following the market. There are always new casino slots to play, and newer slots are often introduced with temporary high return-to-player settings so they can establish a following.

Can I play video slots online for free?

Playing video slots online for free is possible at casinos that provide free demo versions of some or all of their slots. Possibly the best way to play free online slots in the UK – and win real money in UK pounds – is to chase some free spins and welcome bonus slots.

Where can I play a progressive jackpot slot?

Most of the sites we review here offer progressive jackpot slots. It’s no surprise that people like them – you can win a lot of money at a progressive jackpot slot.

They’re risky, though. You can end up breaking your bank completely within 15 minutes. So be careful with jackpots.

You’ll find progressive jackpots at all the best slot sites.