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The Best Online Slots in 2020

Looking for the best online slots? We’ve got you covered. With 3000+ to choose from, discover new favourites with our specialist guidance.

We unveil the top games and where to play them. You’ll soon realise which are worth your time and money.

Top 9 Casinos in the UK for Slots

# Casino Bonus
1
888 Casino
5/5

£100 BONUS

£88 No Deposit Bonus
and 100% up to £100

18+ New players only • £88 is granted in FreePlay (FP) • FP must be claimed within 48 hrs of receiving the email and expires after 14 days • FP wins are credited as bonus and capped at £15, exc. JP win • Bonus wins are capped at £500 • Wager 30x bonus within 14 days • Wagering req's vary by game • Full T&Cs Apply
2
LeoVegas Casino
5/5

£100 BONUS

10 No Deposit Free Spins Plus £100 & 20 Spins

New players only • No deposit free spins available on the “My Offers” page upon registration • No deposit free spins must be claimed within 3 days • Must be used within 3 days of being activated • Any winnings will be paid into cash balance and are withdrawable • Free spins are worth £0.10 each • Book of Dead slot only. • The Casino Welcome Package only available to new players • 35x wagering • 10 free spins on any chosen 2 deposits in the first 7 days from registration. • 18+ BeGambleAware.org • Full T&Cs Apply
3
Betfair Casino
4.5/5

£100 BONUS

30 Free Spins Plus 100% up to £100 Live Casino OR up to £100 Bonus

18+ New UK & IRL players only • Min deposit £10 • Deposits made with e-wallets are not valid for this promo • Bonus wagering x35/x45 on eligible games • Full T&Cs Apply
4
Slot Planet
4.5/5

£222 BONUS

100% Up to £222 + 22 Bonus Spins

18+ New UK players • Min dep. £20 • Free spins on Starburst Slot only • Bonus spins are valid for 10 days, bonus funds for 30 days • 35x wagering req's on bonus • Different games contribute differently • Max bet while using bonus funds is £5 • Full T&Cs Apply
5
CasinoNation
4.5/5

BONUS

No Welcome Bonus

6
Unibet Casino
4.5/5

£40 BONUS

Deposit £10 Get £40

18+ • New Customers Only • Minimum deposit £10 • 35x wagering requirement applies • Bonus will expire 30 days after opt-in • PayPal, Paysafecard, Skrill or Neteller deposits excluded • Full T&Cs Apply
7
bet365 Casino
5/5

£100 BONUS

Up to £100 New Player Bonus

Up to £100 New Player Bonus! New Casino customers only • 18+ | Please Gamble Responsibly | begambleaware.org • Deposit min £10 • Applies to first deposit to Casino only • Max bonus £100 • 20x wagering ((game weighting, table coverage and max. bet rules apply) on deposit and bonus to make the bonus balance withdrawable • Full T&Cs Apply
8
SlotsMillion
3.5/5

BONUS

No Welcome Bonus

9
Videoslots
4/5

£200 BONUS

100% up to £200
+ Win up to 4,200 Extra Spins in Battle of Slots
+ 11 Free Spins

18+ New Players • Min dep of £10 • Bonus Spins have no wagering req's • All 3 welcome offers can be used in conjunction with each other, but must be activated individually • Maximum cash bonus of £200 • Welcome cash bonus comes with 35x wagering req's on deposit in 60 days • Max wager is £20 • Bonus balance is not playable • Winnings are paid out in 10% instalments • Full T&Cs Apply

The Different Types

There are four categories of online slots that you need to be aware of. They range from three-reel classics to progressive jackpots with exciting bonus rounds. Let’s break down each one.

Classic Three Line

Three-reel slots have been around for years. This old school classic is simple to understand. You just need to match three symbols on a single payline to win.

They don’t boast innovative bonus features or impressive graphics. But they’re still extremely popular among players. It proves that the charm of a game more than a century old still has a lot to offer.

Our experts have tested many of these games. Below we list highly rated 3 reel slots available online:

Couch Potato
Mega Joker
Bermuda Triangle
Funky Monkey
Roman Riches

Multi-Payline

Modern slots have multiple paylines that give players more ways to win. The amount is typically around 20-25 lines. But some go as high as 100!

They offer a wider variety of themes compared to the classic single line equivalent. But please note that just because there are numerous winning combinations, that doesn’t necessarily mean your chances are enhanced.

It’s always worth checking the RTP (Return to Player) percentage of casino slots before you start betting. This is a good indicator of your winning probability.

Video Slots

Many of the most exciting games available at UK casinos come in the form of video slots. Players can expect the following benefits:

  • Thousands of real money titles
  • Demo slots available at some top sites
  • Unlock great bonuses
  • Perfect for mobile gaming on the go

Software providers are constantly releasing innovating gameplay due to the lucrative bonus rounds, fantastic visual effects and higher payouts.

Megaways is growing in popularity all the time among new and experienced players. It was created by world-renowned developer Big Time Gaming back in 2015. They’ve since taken the casino slots world by storm.

In simple terms, it’s a random modifier that alters the number of symbols on every reel each spin. This means that there can be tens of thousands of ways to win. Some of the most popular Megaways slots available for you to enjoy include:

Extra Chilli Megaways
Holy Diver Megaways
Primal Megaways
Bonanza Megaways

Thanks to state-of-the-art technology and the creative minds of the game suppliers, the incredible graphics and imaginative storylines are only going to get better.

Progressive Jackpots

If you’re looking for something that gives players the possibility of winning millions, consider these online slots. With such a huge prize on offer, the odds are pretty low. But that’s where the game fairness at UK casinos comes into play.

Due to Random Number Generators (RNGs), most titles give everyone an even chance. However, progressives are slightly different. Your win probability depends on the provider.

For example, Microgaming state that higher bets increase the opportunity of a jackpot win in Fortunium Gold Mega Moolah. The same applies to Playtech slots. But all stakes have equal opportunity with NetEnt’s selections.

Some of the most popular progressives include:

  • Mega Moolah (Microgaming)
  • Mega Fortune (NetEnt)
  • Hall of Gods (NetEnt)
  • Jackpot Giant (Playtech)
  • Arabian Nights (NetEnt)

Top 10 Slots by Payout Percentage

It’s not easy knowing what online slots payout the most. The higher the RTP, the better in terms of having more chance of winning over time. Here are the top 10 games with the best rates:

  1. Mega Joker – 99%
  2. Jackpot 6000 – 98.9%
  3. 1429 Uncharted Seas – 98.6%
  4. Dr Jekyll Goes Wild – 98.20%
  5. Jokerizer – 98%
  6. Jackpot 3×3 – 98.10%
  7. Ragnarok – 98%
  8. Blood Suckers – 98%
  9. Rainbow Riches Fortune Favours – 97.75%
  10. White Rabbit – 97.72%

With thousands of titles available, it’s highly beneficial knowing the RTP of a certain slot. Most licensed UK casinos list the percentages on their site. The average is 95%, so anything above that is considered good.

Playing Slots Online – Strategy and Tips

With so many sites offering strategies and ways to win, it’s tough to know where to turn. Our advice is to steer clear of anyone guaranteeing success for a price. Avoid scams like this.

Instead, heed the online slots tips provided by us. We cover this topic in great depth on a separate page. To give you a taster, here are a few worthwhile approaches to consider:

  1. Take advantage of no deposit bonuses – A promotion where you don’t need to use any real money will stand you in good stead. It’s a great chance to play free online slot games.
  2. Understand the pay tables – It’s worth taking a look at this before you use online slots for real money. Compare a few games and decide on the best one that suits your needs.
  3. Aim for smaller jackpots – It’s all well and good playing Mega Moolah for a £15 million prize, but your odds on winning this are slim. Slots with bonus games paying lower amounts tend to reward players more frequently.

The Best Bonuses for Online Slots

Everyone loves an online slots bonus. With plenty being offered by casino sites, knowing which one to choose isn’t always straightforward.

We’ve reviewed and tested hundreds. Here’s three of the best when it comes to UK slots promotions.

888Casino Slots

This global powerhouse is one of the most trusted places to play. They’ve got plenty of classics as well as new online slots to enjoy. 888Casino even offer proprietory games made exclusively for loyal customers.

You can take advantage of all of these with their £88 freeplay promotion. It’s the first part of their welcome offer. Use this free online slots bonus to get a feel for games you like the look of.

Casino Bonus
888 Casino
5/5

£100 BONUS

£88 No Deposit Bonus
and 100% up to £100

18+ New players only • £88 is granted in FreePlay (FP) • FP must be claimed within 48 hrs of receiving the email and expires after 14 days • FP wins are credited as bonus and capped at £15, exc. JP win • Bonus wins are capped at £500 • Wager 30x bonus within 14 days • Wagering req's vary by game • Full T&Cs Apply

Slot Planet

With 1500+ online slots to choose from, this site is a popular pick. They offer a great welcome promotion that gives you 22 bonus spins on Starburst. Not only that but there’s £222 available too, which includes all slots games.

Casino Bonus
Slot Planet
4.5/5

£222 BONUS

100% Up to £222 + 22 Bonus Spins

18+ New UK players • Min dep. £20 • Free spins on Starburst Slot only • Bonus spins are valid for 10 days, bonus funds for 30 days • 35x wagering req's on bonus • Different games contribute differently • Max bet while using bonus funds is £5 • Full T&Cs Apply

Videoslots

There are over 4000 games available at this UK casino. Their welcome offer is great for anyone looking for some of the best slots bonuses. It includes 11 wager-free spins on Starburst and 4200 extra spins in their freeroll tournaments.

Casino Bonus
Videoslots
4/5

£200 BONUS

100% up to £200
+ Win up to 4,200 Extra Spins in Battle of Slots
+ 11 Free Spins

18+ New Players • Min dep of £10 • Bonus Spins have no wagering req's • All 3 welcome offers can be used in conjunction with each other, but must be activated individually • Maximum cash bonus of £200 • Welcome cash bonus comes with 35x wagering req's on deposit in 60 days • Max wager is £20 • Bonus balance is not playable • Winnings are paid out in 10% instalments • Full T&Cs Apply

Most Popular Titles in the UK

The best online slots in the UK are available at most sites. Experienced players have their tried and tested favourites. Some prefer games that have the best RTP, whereas others love the bonus features.

Here’s a list of the most coveted titles that you can get stuck into straight away:

  1. Immortal Romance – A Microgaming classic with a vampire type theme. The RTP is just under 97% and there are four unique bonus rounds to enjoy.
  2. Book of Dead – An extremely popular title that’s been included in slots free spins UK bonuses for years. Explore an ancient Egyptian tomb Indiana Jones style.
  3. Starburst – Another game that features heavily in UK slots promotions. A NetEnt creation with five reels, 20 paylines and stunning graphics.
  4. Gonzo’s Quest Megaways – Launched in July 2020, this title is already loved by many. There are up to 117,649 ways to win. Uncover avalanche multipliers, earthquakes and unbreakable wilds.
  5. Mega Moolah – Purple monkeys and beaming lions make this game exciting. These give you the chance to win big. There are four progressives jackpots to win on their wheel of fortune bonus game.
  6. Street Fighter II – One of the new online slots. With a ton of features and retro graphics, it feels like the much-loved arcade classic. In terms of slots with bonus games, this is up there with the best.
  7. 1429 Unchartered – This title is packed with quality visuals and great features. It also comes with a superb RTP of 98.6%. With stacked wilds and free spins frequently awarded, it’s very popular among UK players.

Understanding Slots

Knowing how online slots work before playing them is very important. It helps players understand the mechanics behind each one and how bonus rounds are triggered.

Always consider the following prior to betting on any:

  • Payout rates – The better titles have an RTP of 95%+. The exceptions here are jackpot slots as the prize is much bigger. They tend to sit at around the 94% mark. We’d recommend avoiding any that are less than this.
  • Variance – This refers to a game’s frequency in producing winners. For example, the three-reel classic Mega Joker is a low variance slot as is pays less but more frequently. Mega Moolah is high as it does the opposite.
  • Features – Decide whether you prefer bonus rounds and extended game time or a simple spin of a reel.
  • Visuals – HD video, 3D graphics, and dynamic sound make for a great betting experience.
  • Theme – Some are based on popular TV shows or video games, which might spike your interest.

It’s always worth taking advantage of any casino slots that offer freeplay. This will allow you to test out each one without having to use any real money.

What’s also important to understand is the range of special symbols. They include wilds, scatters, and multipliers. Let’s expand on each of these for you.

Wild Symbols

These are like jokers in a pack of cards. A wild symbol is essentially anything you want it to be in order to create a winning payline.

For example, if there are two lions on the first and second reel, a wild on the third would mean you’re a winner. They’re completely random and can appear at any time.

Wilds come in a few different shapes and sizes, including:

  • Stacked Wilds – This is where the symbols appear on top of one another. It can form an entire section on a reel.
  • Sticky Wilds – These remain on the screen and hold their position for a certain number of succeeding spins.
  • Expanding Wilds – Every standard symbol of a particular type is substituted for a wild, which expands across the length of the reels. The number of winning combinations increases dramatically.
  • Overlay Wilds – These variants stack up in a certain way at the end of a spin. They replace standard icons and help activate free slots spins or bonuses.

Scatter Symbols

To unlock an exciting feature, three or more scatter symbols need to appear after a spin. They don’t have to be on the payline either, they can be anywhere on the reels.

Always check the pay table guides for each game. They will tell you how many need to show for an online slots bonus to materialise.

Multipliers

It does exactly what it says on the tin – multiplies your winnings. They’re very similar to scatters but with the added perk of increasing payouts. These range from 2x right up to 1000x and more!

One further benefit is that they multiply your total for the round and not just the payline it sits on. This type of symbol often appears when using free spins on slots.

Play on Mobile Devices

starburst slot by netent

With well over half of all UK players now preferring to bet on a phone, it’s essential that online slots are fully optimised for mobile devices.

Thankfully, the majority work extremely well on smaller screens. However, a lot will depend on the technical specifications of what you’re using to play them on.

We cover this topic in much more depth on our dedicated page. Discover the best ones and where to play them.

What About Tournaments?

Tournaments are growing in popularity and are a carry-over from land casinos. Although the majority of events are open to anyone, some are exclusive to VIP members only.

The premise of each event is always the same: the person with the biggest balance wins after a predetermined amount of time.

But how do they work? Well, each one will be different depending on the operator. But, generally, a certain game is chosen, and you’ll usually have to pay a small fee to enter.

Players then get to enjoy free play slots with a certain number of credits. You’ll either win a share of the prize pool or it’ll be a winner takes all scenario.

How to Play for Free

Plenty of UK casinos offer free online slots that enable players to test different titles before committing with their own funds.

Follow these simple steps to get started:

How to Play Casino Slots for Free

  1. Find a top online slots site that has freeplay available.
  2. Locate a game you want to play and load it up.
  3. Check the pay table to understand each symbol’s value.
  4. Select how many paylines to bet on.
  5. Choose the amount you want to stake.
  6. Hit the button to spin the reels.
  7. Continue as many times as you like.

Always keep an eye on your bankroll. It’s best practice for if and when you decide to play online slots for real money.

If there aren’t any free games available for whatever reason, it’s certainly worth trying out new titles with a casino bonus offer.

Are Online Slots Safe?

All online UK slots sites that hold a valid licence are safe to use. Furthermore, any that hold the eCOGRA seal of approval demonstrate compliance to the highest standard.

This independent body ensures all games are random and fair. These are the places where you should be playing.

Make sure you read our trusted and unbiased reviews too. We’re honest with our views and will tell you how good a certain casino is. Rest assured you will always enjoy the top online slots in the safest possible environment.

Summary

You should now be familiar with where to play online slots in the UK. We’ve listed the best ones and unveiled why they get the thumbs up from us.

Whether you prefer progressive jackpots or a classic three-reel version, there’s something for everyone to enjoy.

Understand the strategies involved, explore the best online slots bonuses, and give freeplay a go if you can.

Some UK casinos are better than others in terms of the slots on offer. Thankfully, we've done all the hard work and listed the very best sites for you! Explore the Best Casinos for Slots

Best Online Slots FAQs

There are many different types of games from the old-school classics to new and exciting Megaways. The best online slots are those that offer you a great betting experience.

 

It ultimately comes down to personal preference. We explain what’s available to you on our casino slots page.

Slots come in all shapes and sizes, but they must all have the same common attribute to be considered a great one in terms of potentially winning real money – a high payout rate.

 

What slot you prefer depends on your personal choice, but the more you understand about the different slots available, the better knowledge you’ll have going forward about what’s best for you.

Yes, you can. But it’s a game of chance, so it’s hard to say if and when you might win. Our advice would be to try an online slots bonus. Specifically, ones that require no deposit if possible.

 

These types of slots promotions allow players to try out different titles with minimal risk.

If the UK casino holds a valid licence, the answer is yes. All sites listed at Casino Deal are safe and secure.

 

Many go that one step further and display eCOGRA’s logo as a seal of approval. It proves that their game results are all random and fair.

The top online slots in terms of payouts are based on a high Return to Player (RTP) percentage. For example, Mega joker sits at 99% whereas progressives are around 94%.

 

The higher the number, the more chance you have of winning in the long run. However, always use these as a rough indicator as the figures are taken over hundreds of thousands of spins.

Plenty of sites in the UK offer free play slots. Follow our helpful step-by-step guide on how to play without using your own funds. Find your favourites today.