Best Slot Sites Online – Expert Reviews & Comparisons!

While online casinos nowadays will allow you to play a variety of casino games, from craps to poker, there is one game that stands out as the best. Slots  – an evolution of your typical “fruit machine”, online slot machines are by far the most popular game at the casino. All of the most popular online gambling sites offer hundreds and sometimes even thousands of these games. They’re simple, often have great graphics and most importantly offer you the chance at massive jackpots!

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Most Popular Slots in UK

Name Provider Release Year RTP Volatility
Starburst NetEnt 2013 96.09% Low
Bonanza BigTimeGaming 2016 96% High
Rainbow Riches Barcrest 2009 95% Medium
Book of Dead Play’n Go 2016 94.25% High
Slingo Rainbow Riches Slingo 2018 95.6% Medium


So you’re interested in slots and haven’t picked a casino yet. That’s okay, because there are hundreds of casinos that allow players in the UK. It’s our job wade through the sea of options and help you find the best slot site for you. Our guides are designed to not only show you the best slot sites that UK players can join, but also what makes them the cream of the crop. We’ve done all of the heavy lifting so that you’re able to easily decide which site to head to.

As you’ll find with any of our casino reviews, we won’t just list the best sites; we dig into what makes an online casino “the best”. We’ll even help you figure out how much real money you could win playing at one of the casinos in our list. So, read on, learn about each site and make an educated decision on where to play online slots in the UK!

Let’s start out with our pros and cons of online slots:



Convenience – No one can argue the sheer convenience that comes with playing slots online. You can play from whenever you want, wherever you want, on any mobile device or on your desktop computer. It really doesn’t get any better than that. Less social – Yeah, playing online or through mobile can be a bit more isolating, but why not invite some friends over and play together? Or try live casino options or tournaments where they’re available to get that social fix.
Variety – The variety that comes with playing the best slots sites in unbeatable. There are thousands of different variations available at the click of a button. Something that would never be possible anywhere else. Technology – Technology can be hard to deal with sometimes. Freezing, skipping and the unreliable battery of a device can all have an impact on your slot experience. But don’t worry. Any online casino we recommend will be happy to help you if any problems arise.
Payouts – Did you know? Online slot games are known for having higher payouts and RTP than any other version of the game. This means that players win more often when they’re spinning the reels.


Here are just a few types of the best slots online you will find while playing:

Classic Slots

Classic slots are exactly what you see when you picture a slot machine. It usually has three or five reels, a couple pay lines, and sure makClassic Slotes for a lot of fun. The classic variation of slots is one that we hold near and dear to our hearts because it’s a great option for both new and seasoned players. No tricks or surprises here.

Video Slots

Video slots are one of the most popular variations of the game. Why? Well because of the digital revolution, of course! With technology, came a huge opportunity for video slots, and they became faster, more enjoyable, and just flat out easy to learn and play. With graphics that could blow your mind, and sneaky bonuses that make you want to keep playing, you can never go wrong with playing a video slot.

Jackpot/Progressive Slots

Jackpot SlotThis is where things get really exciting. Developers will link many games, or sites together in order to create a huge prize pool. Every time money is wagered on one of those slots, a percentage goes into the pot and is up for the taking. Is it easy to win? No. But is it worth giving it a shot? Absolutely. The payouts on progressive slots are usually life changing amounts above £50,000 on slots like Mermaid’s Millions.

Mobile Slots

Mobile slots are perhaps our favourite variation of the game. This is because they are made to play on the go, and that’s what we are all about here at TopMobileCasino, if the name didn’t already give it away. Play anywhere and everywhere (as long as you have a solid connection to the internet) and you should be winning in no time.

Slots From Top Developers

We’re ALWAYS looking at what slots are on offer. Having thousands available is worthless if they’re from bad developers. That’s why we check to see that the sites are offering slots from the biggest companies. These are some of the top operators we like to see on the sites we review:

Microgaming – Everyone knows Microgaming. That’s just a fact. They are one of the most popular operators in the world, and are constantly releasing new, unique slot options for players. Not only that, but they created one of the highest paying progressive slots ever – Mega Moolah. Players have been known to win millions playing the best online slot.

NetEnt – NetEnt has made themselves one of the most popular and sought over operators in the industry. This is because of their innovative and unique gaming options that are massively popular through the UK. Ever heard of Gonzo’s Quest or Starburst? Of course, you have! They are both NetEnt games.

Playtech – Playtech is no stranger to the online casino game industry. In fact, they have become the number one choice for many UK players, and for good reason. Offering up progressive jackpots like Beach Life and Gold Rally, has been a very successful endeavor for Playtech, and we can only imagine what they’re going to come up with next.

Novomatic – Founded by Johann Graf, Novomatic is one of the oldest in the industry. They have become popular over the years for exporting their advanced gaming equipment around the world and for becoming a pioneer in in many ways. Just try Lucky Lady’s Charm for yourself to check out what their gaming experience is like first hand.

IGT – International Game Technology, or better known as IGT, has been in the industry for years now. With many firsts under their belt, they are one of the most well-known operators not only in the UK but in the world. Candy Bars, Siberian Storm Dual Play and Cats are just a couple of their more popular games.

NextGen – For 17 years now, NextGen has been an industry leader. With hundreds of games both on and offline, players would be hard pressed to visit a casino without NextGen games waiting to be played. One of our favourite games, Merlin’s Millions was developed by NextGen, along with Medusa and 300 Shields.

Barcrest – Would you believe us if we told you Barcrest has over 50 years’ experience in the industry? Well they do. They began in 1968 and have been taking the gaming world by storm ever since. Action Bank, Boulder Backs, Rainbow Riches and Pots of Luck are some of the top games that they offer.

Real Time Gaming – Real Time Gaming (RTG) has a philosophy of “We take gaming seriously.” And they prove it time and time again. They offer many different slot variations for players. And with some of their most popular slots including High Roller, Big Shot and the Three Stooges, RTG is a must have operator in any decent online casino.

The best slots don’t just come from the big developers though – we’ve got our ears to the ground looking for the next up and comer’s too.

At the end of the day we’re looking for a seamless blend of quality and quantity like a beautiful blended scotch. For us, the best sites have huge game libraries that are constantly updated and curated.

How Online Slot Machines Work

All this slot information is nothing, if you don’t find yourself understanding how they work. Almost every slot has the same functionality when it comes to buttons, reels, symbols and pay lines. All of these things work the same on every slot, but they aren’t necessarily the same in how they look or what they offer. Below, we’ll break down what each function does.

Starburst Online Slot

Reels – Reels are the columns that spin inside the slot. Most commonly, players will either being playing on a 3-reel or 5-reel machine.

Pay lines – These are the lines that run horizontally across the game, and what eventually lead to a win.

Symbols – These are always different, and make up the population of the spinning reels. These symbols are usually in tune with the games direct theme. These are the things you want to line up in order to win big.

Spin – This is the button you press in order to get the reels spinning. You can also use this button to stop the reels at any time.

Auto play – Not interested in clicking spin every time? Auto play allows you choose a certain amount of spins that will automatically load after each spin finishes.

Bet – This is the amount you are betting on each spin.

Max Bet – Choosing this option will automatically select the maximum bet. It will also select all the pay lines.

Online Slot Bonuses

Bonuses are a huge part of the experience of playing at the best online slots sites. Players will often use these bonuses as much as possible. In fact, these bonuses are best used on slots. That’s often because of how other games like blackjack or craps are counted towards a bonus’ rollover requirement. So, your best “bet” is to use your bonus to play slots.

A rollover requirement, also know as a playthrough or wagering requirement, is essentially how many times you will have to bet your deposit + bonus before you are able to withdraw your winnings. Online slots often contribute at 100% of your wager, but a game like craps can be as low as 5%.

For those new to online casinos, the most important bonus is always going to be that first deposit bonus, aka the welcome bonus. It can almost always be used to play slots and sometimes will even come with free spins on a specific slot machine. The ability to play for free is a great way to learn how to play the game, while giving yourself a crack at winning some real money at the same time.

We also mentioned loyalty programs above. Playing the best slots online is quite often the perfect way to earn loyalty rewards. The quick gameplay allows for a quick points buildup. Depending on the site you are playing at, these rewards come in all kinds of different shapes and sizes, from free bonus funds to earning back a percentage of your losses. Each site’s loyalty program is different, so before you sign up, make sure you read the terms and conditions.

FAQs For Online Slots

How are the best slots decided?

We’ve spent what feels like forever looking for the best UK slots sites. Our team of experts spends all of their time combing through all sorts of so-called “best slots sites online”. We review each one meticulously, weening out the good from the bad to make sure that if we’re recommending it, it’s perfect for UK players. There’s a list of criteria that we follow when we’re deciding if a casino belongs among the best sites. Besides slot options and bonuses, here’s what we look for:

  • Customer Service – Is it responsive? Do they offer it 24/7?
  • Security – Are your transactions SSL Encrypted? Is the casino licensed?
  • Banking Options – What deposit methods are available? How quick can you withdraw?

It is our job to cover all of these areas so that when it’s time, all you need to do is join the site of your choosing and start spinning the reels! After all, you could be one spin away from winning a fortune!

Can I play slots with a mobile device?

You certainly can – in fact, a site won’t make it onto our list of the top UK slots sites if it doesn’t have a really strong mobile offering. After all, our site is called Top Mobile Casino. The best mobile slots in the UK are on sites that adapt the screen to fit any mobile device. The mobile casino should allow you to control everything using your device’s touchscreen. You won’t find quite as many slots on a mobile site, however, the selection should still be large, and encompass the three different types of slots mentioned further up this page.

Mobile gamblers should also find that they have access to the same features as desktop players. So, you’ll still be able to use your preferred payment method while gambling from your mobile, and will also be able to contact customer support. You’ll be able to play at nearly all mobile sites by accessing the site using your mobile browser. Some sites even offer a mobile casino app, which makes gambling with a mobile easier than ever. So, if you own a smartphone or tablet, you’ll definitely be able to pay at the best online casinos in the UK.

Are the jackpots high at the best slots sites?

The jackpots aren’t just high – they are sometimes astronomically huge! The biggest prizes are found at the progressive slots, with the two largest usually being Mega Moolah and Mega Fortune. The reason these jackpots get so high is simple: the jackpots keep rising as more and more people play them. This happens until one lucky player hits the jackpot. All progressive slots will have a counter showing the current jackpot amount, so you can pick the one with the biggest jackpot at the moment.

When it comes to progressive jackpots, it doesn’t matter which site you play at, as the progressive jackpot game is linked across all sites. This means that you don’t have to head to the same casino as everyone else, but can instead head to the casino you think is best, and still have the chance to win a massive sum of money. Players in Australia are contributing to the same jackpot that someone playing at an online casino in the UK is.

But how can you give yourself the best chance possible of winning a jackpot? Well, the best online casinos will publish the RTPs of each and every slot they offer. RTP, which stands for Return to Player is expressed as a percentage and is the long-term average of what you’ll win back over time. The higher the percentage, the more chance you’ve got of winning. So, if a slot has an RTP of 98%, you should expect to get back, on average, £98 for every £100 you spend. This means that this slot offers you a better chance of winning than one with a 95% RTP. So, check out the RTPs before you start spinning the reels and watching the symbols land in place.

Are online slots completely fair?

When you play at a site we recommend, you can be sure that the slots are all completely fair. This is because we only recommend sites that have had their games verified by an external company, and that is also regulated by the UK Gambling Commission. All of the slots you play through the sites we recommend are powered by random number generators, which help to completely remove any house bias.

What is the best site for slots in the UK?

If you’re looking to find the best slots that UK gamblers can play, there are many choices. If you scroll up this page though, you’ll see the site we currently think is the best. This list changes regularly though, so check back often!

How much money can I win playing slots?

This really depends on the slot in question. Progressive jackpots, such as those at Mega Moolah and Mega Fortune, can exceed £10,000,000 though and are won approximately once every 2 – 3 months. Video slots and classic slots will tell you how much the jackpot is on the paytable. It can sometimes be in the hundreds of thousands of euros – it all depends on how much you bet.

What is the UK's most popular slot?

There are quite a few popular slots in the UK, however, one of the most popular that we haven’t already mentioned is Mega Moolah – the slot from Microgaming with a massive progressive jackpot. Most games by Microgaming, NetEnt and Playtech are popular though – you’ll have to play a few to pick your favourite!

Is it legal to play online slots in the UK?

Yes, it is completely legal to play slots online in the UK, providing you are 18 years of age or more. The relaxed gambling laws in the UK are one of the main reasons why UK gamblers are some of the most avid in the world.