Your browser is out of date and may not be supported!
Please consider updating your browser by clicking here

Best Online Slot Sites UK - Compare The Top Slot Sites

You will see more than five slot machines at the best slot sites

There are so many slot sites out there that it can be really hard to know which are the best ones. 

Top slot sites offer gamblers lots of games, high-quality titles, good payouts (RTP), and security – these are the things we’ve judged the slot sites against in this review. 

We’ve focussed on a few key areas when reviewing the UK’s top slot sites: 

  • Free spins 

  • Welcome bonus 

  • Games 

  • Payouts 

  • Mobile gambling 

  • Licensing and legislation

The most important thing to remember when gambling at slot sites is that you should have fun. Each of the websites we’ve reviewed offers an enjoyable gambling experience, along with the chance to win some money. 

We’ve listed the top slot sites in various areas and explained the key things you need to know about them – all you need to do is decide which is the right one for you and then place your bets. 

Please be aware that all bonuses and promotions mentioned in this article come with the following conditions in order to meet UK casino compliance laws:

  • 18+  
  • T&Cs apply 

Top UK online slot sites 

Slot Site

Rating

Welcome Bonus

Free Spins

RTP

Games

Sports

App

Review

LeoVegas

⭐⭐⭐⭐⭐

£300

20

99.99%

780

Yes

Yes

LeoVegas

Mr Green

⭐⭐⭐⭐⭐

£100

200

99.90%

650

Yes

Yes

Mr Green

Casumo

⭐⭐⭐⭐

£300

30

97.20%

788

No

Yes

Casumo

bgo

⭐⭐⭐⭐

£200

100

99.32%

579

No

Yes

bgo

Betway

⭐⭐⭐⭐

£1,000

30

98.10%

511

Yes

Yes

Betway

32Red

⭐⭐⭐⭐

£150

None

97.43%

461

Yes

Yes

32Red

Royal Panda

⭐⭐⭐⭐

£100

10

97.60%

411

No

No

Royal Panda

Jackpot247

⭐⭐⭐⭐

£100

250

99.32%

170

No

Yes

Jackpot247

Casino.com

⭐⭐⭐⭐

£100

20

99.32%

120

Yes

Yes

Casino.com

PlayOJO

⭐⭐⭐⭐

None

50

96.40%

696

No

Yes

PlayOJO

Genesis

⭐⭐⭐⭐

£100

300

96.70%

511

No

Yes

Genesis

888 Casino

⭐⭐⭐⭐

£400

30

97.15%

185

Yes

Yes

888 Casino

Roxy Palace

⭐⭐⭐

£100

50

99.91%

250

No

Yes

Roxy Palace

Betfair

⭐⭐⭐

£100

None

97.40%

202

Yes

Yes

Betfair

Our number 1 slot site: LeoVegas

LeoVegas is one of the top slot sites.

Credit: LeoVegas

  • Payout: 99.99%

  • Games: 780

  • Free spins: 20 

  • Welcome: bonus: £300 

While there are many great slot sites, there was simply no competition for the top spot – it’s LeoVegas. 

  • LeoVegas has the best RTP – 99.99%

  • LeoVegas has the second-most games – 780

No other slot site matched LeoVegas for the combination of games and the level of payout offered to gamblers.

This means that it’s the best option for casual betters who play for fun and more serious gamblers who want to win some money. 

You can find out why we think LeoVegas isn’t only one of the UK’s top slot sites, but one of the very best places to gamble online, by reading our dedicated review or visiting LeoVegas Casino now. 

LeoVegas has more than eight great slot games that you can play.

Credit: LeoVegas

The payout and number of games a slot site offers are incredibly important when comparing it against its rivals. 

However, the number of games a slot site has and the RTP it offers isn’t the only way that we compare the UK’s top slot sites – the quality of games has to be good too. 

LeoVegas has the quality of slot games to go with its incredible quantity. It offers both the biggest titles, some unique games, and plenty of games with a retro theme – in short, there’s something for everyone.

Top 5 slot sites for free spins  

Slot Site

Rating

Free Spins

RTP

Genesis

⭐⭐⭐⭐⭐

300

96.36%

Jackpot247

⭐⭐⭐⭐

250

96.60%

Mr Green

⭐⭐⭐⭐

200

96.00%

bgo

⭐⭐⭐⭐

100

97.23%

PlayOJO

⭐⭐⭐⭐

50

95.30%

Every slots site worth its salt will offer free spins and we found some great offers when comparing the very best sites. 

However, there was a clear winner – Genesis, with 300 free spins. 

Free spins are great for new gamblers who are deciding what slot sites they want to sign up to – they give you a chance to try out games without paying a penny. 

While free spins might sound like a great deal (and in many ways they are) they do come with some conditions that you need to be aware of:

  • Free spins are generally for specific slots games 

  • Free spins can be dished out in daily doses – not all at once

  • Free spins often have a time limit on them 

And the thing to note is that free spins only apply to new gamblers. This means that if you’ve already signed up to a slots site you are no longer eligible to get its free spins offer. 

Best slot site for free spins: Genesis

Genesis is one of the top slot sites for free spins.

Credit: Genesis

We compared the best slot sites for free spins and Genesis is the clear winner, with 300 free spins. 

Genesis offers 50 more free spins than the second-placed slot site, Jackpot247, and an enormous 250 more than fifth-placed PlayOJO. 

You need to check the conditions that come with Genesis’ free spins offer to make sure you get the best value from them – we recommend checking the site’s official page to get the full details of the offer. 

Learn about all the other reasons that Genesis is one of the top slot sites by reading our reviewor visiting Genesis Casino now.

Top 5 slot sites for welcome bonus 

Slot Site

Rating

Welcome Bonus

RTP

Betway

⭐⭐⭐⭐⭐

£1,000

96.36%

888 

⭐⭐⭐⭐

£400

96.60%

LeoVegas

⭐⭐⭐⭐

£300

96.00%

Casumo

⭐⭐⭐⭐

£300

97.23%

bgo

⭐⭐⭐⭐

£200

95.30%

Welcome bonuses are a big part of the offer slots sites make to new gamblers – they represent a chance for players to get some money free of charge (sort of). 

This was one of the easiest comparisons we made. Why? Because Betway has by far the biggest welcome bonus of any slots site we reviewed, offering £1,000 to new gamblers. 

While some people can be fooled into thinking that welcome bonuses are free money, it’s not as simple as signing up to a slots site and then getting the full cash amount advertised. 

The reason for this is that welcome bonuses come with conditions – such as needing to spend a certain amount of your own money before you can get the bonus offer. 

Best slot site for welcome bonus: Betway

Betway is one of the top slot sites for welcome bonuses.

Credit: Betway

There was simply no other winner than Betway when looking at the best slot sites for a welcome bonus – Betway’s £1,000 package is £600 better than second-placed 888. 

Before you get too excited about this, you won’t get £1,000 deposited into your account once you’ve signed up to Betway – there are plenty of requirements you need to meet to get it. 

We recommend heading over to Betway’s site and reading through the offer in detail, so you understand just what you need to do to get the full £1,000 welcome bonus.

Betway isn’t only one of the top slot sites because of its welcome bonus – it’s also got loads of great games and a superb sports betting package. 

Read our review of Betway to learn all the reasons we think it’s a great site for gamblers. 

Top 5 slot sites for games 

Slot Site

Rating

Games

Welcome Bonus

Free Spins

RTP

Casumo

⭐⭐⭐⭐

788

£300

30

97.20%

LeoVegas

⭐⭐⭐⭐⭐

780

£300

20

99.99%

PlayOJO

⭐⭐⭐

696

None

50

96.40%

Mr Green

⭐⭐⭐⭐⭐

650

£100

200

99.90%

bgo

⭐⭐⭐⭐

579

£200

100

99.32%

Games are one of the main reasons to head to a slot site – sure, you want to win some money but you need to place a bet on a game to do so. 

Because there are so many slot titles out there, we think it’s crucial to compare how many games are offered by the leading slots sites.

And which site has the most? Casumo, with an enormous 788. 

This puts Casumo 8 games ahead of second-placed LeoVegas (which has 780) and means that the margin between the winner and the fifth-placed slot site (bgo, which has 579) is a very hefty 209. 

However, LeoVegas has a payout of 99.99% – which is the best you can ever expect to get from a slots site. 

This means that we ultimately went for LeoVegas as being the best slot site for games. 

In the following section, we look at the five top slot games you can play at LeoVegas. 

Best slot site for games: LeoVegas 

LeoVegas has comfortably the best RTP – 99.99% 

LeoVegas has the second most slot games – 780.

With so many great titles to choose from, it was tough to make a list of the top five slot games on offer at LeoVegas. But, after a lot of discussion and consideration, we compiled our list and you can see the results below. 

You’ll note that the payout for these games isn’t the same as the overall one we gave earlier in this section. This is because each game has its own unique payout, meaning it will be different from the total (average) RTP for LeoVegas’ slot games.   

Top 5 slot games you can play at LeoVegas

LeoVegas has more than eight great slot games that you can play.

Credit: LeoVegas

Starburst 

Starburst is a slot game you can play at the best slot sites.

Credit: YouTube

  • Payout: 96.10%

  • Paylines: 10 

  • Jackpot: 250

  • Software provider: NetEnt

Leprechaun Hills

Leprechaun Hills is a slot game you can play at the best slot sites.

Credit: YouTube

  • Payout: 96.47%

  • Paylines: 40

  • Jackpot: 6

  • Software provider: Quickspin

Centurion Free Spins

Centurion Free Spins is a slot game you can play at the best slot sites.

Credit: YouTube

  • Payout: 95.00%

  • Paylines: 20

  • Jackpot: 500

  • Software provider: Inspired

Game of Thrones

Game of Thrones is a slot game you can play at the best slot sites.

Credit: YouTube

  • Payout: 94.86

  • Paylines: 243

  • Jackpot: 30

  • Software provider: Microgaming

Casper’s Mystery Mirror

Credit: YouTube

Alt-text: Casper’s Mystery Mirror is a slot game you can play at the best slot sites.

  • Payout: 95.50%

  • Paylines: 40

  • Jackpot: 500

  • Software provider: Blueprint Gaming

UK slot sites with over 500 slots games 

Slot Site

Rating

Games

Welcome Bonus

Free Spins

RTP

Casumo

⭐⭐⭐⭐

788

£300

30

97.20%

LeoVegas

⭐⭐⭐⭐⭐

780

£300

20

99.99%

PlayOJO

⭐⭐⭐

696

None

50

96.40%

Mr Green

⭐⭐⭐⭐⭐

650

£100

200

99.90%

bgo

⭐⭐⭐⭐

579

£200

100

99.32%

Betway

⭐⭐⭐⭐

511

£1,000

30

98.10%

Genesis

⭐⭐⭐

511

£100

300

96.70%

While we know that slot titles usually make up the majority of the games on gambling websites, it was still a surprise to learn just how many slot sites have a huge library of games. 

Having played the games at all of these slot sites, we can confirm that not only do these seven betting websites have lots of games but they also have excellent titles – they’ve got both the quality and quantity that gamblers demand. 

We recommend that you give each one a try. Why? Because while many have the same games, each slot site has a different site interface. 

This means that one may be to your liking more than the others and trying them is the only way to find out which one is your favourite. 

Top 5 slot sites for payouts

Slot Site

Rating

RTP

Games

LeoVegas

⭐⭐⭐⭐⭐

99.99%

780

Mr Green

⭐⭐⭐⭐⭐

99.90%

650

Roxy Palace

⭐⭐⭐⭐

99.91%

250

Jackpot247

⭐⭐⭐⭐

99.32%

170

Casino.com

⭐⭐⭐⭐

99.32%

120

First and foremost, playing slot games should be about one thing – having fun. 

Slot games are like every other game, you play them to be entertained and your enjoyment should begin with simply participating. 

However, like every other game, slot games do have an objective – to win. And the reward you get for winning slot games is money – your payout. 

So, how do you measure the payout in slots? By the RTP. And we’ll explain how this works. 

RTP stands for return to player. It’s so-called because it’s the amount of money that’s returned to players over time. Here’s an example of how that works – if a slot site has an RTP of 99.99%, this means that £99.99 of every £100 wagered is returned to players in the long run. 

But, continuing with the example, what you need to know about RTP is that just because you spend £100 it doesn’t mean that you’ll get £99.99 back. This is because the RTP of a slot site covers every player and every bet placed – and some bets win and some lose. 

Two fifty pound notes will be returned to players if the RTP is 100%.

Credit: tOrange

ARTP in slots is insanely competitive, with many slot sites offering close to 100% – indeed, the difference between the top slot site and fifth-placed one is just 0.67% (£0.67 for every £100). 

But there can be only one winner and it’s LeoVegas, with a monster 99.99%. 

Top slot sites for mobile gambling 

Mobile gambling is something that gamblers expect from slot sites – with more internet traffic coming via mobile than desktop, gambling websites need to have a mobile offering to be truly online. 

Unsurprisingly, almost every slot site we compared has an app – Royal Panda is the exception, preferring instead to offer a browser version of its site which can be played on mobile. 

The apps created by slot sites replicate their website offering as closely as possible, with many being a mirror version of the website – the number of games is often near-identical when comparing the app and website. 

This smartphone can take pictures and let you play games at slot sites.

Credit: Pixabay

What this means is that the apps of slot sites must be judged on something different – how easy they are to use. 

Many of the slot sites we reviewed have apps that are a breeze to use, honourable mentions going to: 

  • LeoVegas

  • 32Red

  • Mr Green 

  • Betway

  • Casino.com 

But one slot site stood out above the rest – Casumo

We think that Casumo has the best app of all the slot sites we compared, but that’s not the only reason we think it’s great for gamblers – it also has some great roulette, poker, and blackjack games (among others). 

You can learn about all the reasons we think Casumo is a top slot site by reading our full review

Licensing and legislation icons you expect to see on slot sites

The first thing any gambler should expect from the top slot sites is that they are able to have fun. The next thing they demand is that the site is safe — the icons of licensing and legislation organisations will confirm that it is. 

Any slot site that operates in the UK has to be regulated by certain gambling organisations and national authorities, even those that are registered outside of the UK – like in Sweden, Malta, or Gibraltar. 

Slot sites want their players to know that they’re safe to use and the way they confirm this is by putting the icons of gambling regulators on their websites. There are some key icons you need to look for and these are the most important ones: 

UK Gambling Commission  

Look for the UK Gambling Commission logo on slot sites.

Credit: Gambling Commission 

Any slot site that is allowed to operate in the UK is ultimately regulated by the UK gambling commission. 

Government of Gibraltar  

Look for the Government of Gibraltar logo on slot sites.


Credit: Wikipedia

If a slot site is licensed in Gibraltar then you’ll know this to be the case by the Government of Gibraltar logo on its website. 

Malta Gaming Authority 

Look for the Malta Gaming Authority logo on slot sites.

Credit: Malta Gaming Authority

If a slot site is licensed in Malta somewhere on its website you’ll be able to find the logo of the Malta Gaming Authority. 

Spelinspektionen

Look for the Spelinspektionen logo on slot sites.

Credit: Spelinspektionen

You’ll know if a slot site is licensed (or able to operate) in Sweden because the Spelinspektionen logo will be displayed on its website. 

Look for responsible gambling icons on slot sites 

We’ve been clear that fun is the main reason you should gamble and you should never lose sight of this, rather than focussing on whether you win or lose – even the best gamblers can lose and even the worst ones can win. 

How you measure fun is up to you. 

You might decide that fun looks like lots of brightly coloured slots, or you might decide that it looks like a slot game with a competitive RTP. But the key is that you gamble responsibly

Slot sites want their gamblers to know that they have a commitment to responsible gambling and they do this by putting the icons of relevant organisations on their websites. 

These are the responsible gambling icons you should look out for on slot sites:

GamCare

Look for the GamCare logo on slot sites.

Credit: GamCare

GamCare is a UK charity that offers support to people who believe they have a problem with gambling. It’s an organisation that people can speak to and seek the support that they need. 

GAMSTOP

Look for the GAMSTOP logo on slot sites.

Credit: GAMSTOP

GAMSTOP is a self-exclusion organisation that allows gamblers to block themselves from slot sites and other betting websites. 

People can contact GAMSTOP and register their intent to self-exclude from a specific site for a set amount of time. This means that during this timespan the person will be blocked from using that site by the site itself – it’s like they have a temporary ban. 

You can contact GAMSTOP to find out if your preferred slot sites offer self-exclusion.

What is the best online slot site for gamblers? 

There are many different slot sites and the best one could be different for each gambler. However, we believe that LeoVegas is the best slot site for gamblers.

This is because LeoVegas has the best RTP and the second-highest number of games of all the slot sites we reviewed. 

Can you play slots online for real money?

There’s an enormous number of slot sites that allow you to play real money slot games. In fact, most of the slot sites you find will be real money ones. 

All you need to do to know if real money games are available is to head to the slot games section, where it will confirm if you can make cash bets.