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Top UK Online Slots Sites (Best Sites, Games, Bonuses) | Mobile Slots Sites

Best Online Slot Sites

Online slots sites have been a growing business in recent years, and there are hundreds of sites to choose from even thousands of different slots to play at each of them.

Finding the best online slot site to play your favourite slot games can be a daunting task. So here at OLBG, we have put our online casinos experts to the test to go find the best options from the wide variety of slot site choices and bring you an in-depth guide and some slot site recommendations along with bonus options too.

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Why Play Slots Online?

For one thing, playing at an online slot site means you can play your favourite slot games from wherever suits you. Over 60% of all online slot site player now play on their mobile devices providing the freedom and convenience of playing, whenever and wherever they like.

Another advantage of online slots site is that they offer a wide variety of slot game, bonus offers and promotions not available at land-based slot sites.

Some sites offer over 1000 different slot games, from a variety of the top slot providers from around the world, ensuring you'll never be short of slot choice, to suit your preferred slot features and staking options.

What is the Best Online Slot Site for Me?

The best online slot site for you will depend on the type of gameplay you like. This page outlines real money slot sites, so if you are looking for free slots to play, your only option here is to register with a site that offers a great free spins bonus, although in almost all cases you will have to register to play free spins.

Very few slot sites offer no deposit free spins, and you'll get very few spins at those that do.

We have an article on current slot sites offering free spins with no deposit, but the offers can come and go very quickly, so take a look today and see what's on offer.

New Slots Sites

There are new slots sites launching almost continuously with new brands and groups of slots being released on almost a weekly basis, as well as new brands being listed on the slots sites page right her on OLBG, so where do all these new slot sites come from?

We do not include all new slots sites, we only list those we have practical experience, or prior knowledge and experience of from within a group.

We may also list new slots site that are not new to the business but new in that we have only just listed them.

New Brands from Existing Operators

There are some slot site operators who have many different slot sites operating under different brand names. This is usually a design differentiation catering for different types of customer profile. The simplest explanation of this is sites designed specifically for female players, against the generic slot site designs.

Or it may be that the operator has identified an opportunity to design the slot site on a theme. A good example of this would be Pots of Luck Casino which has been designed specifically as an 'Irish Themed' slot site.

You'll find well known Irish slot games like Rainbow Riches and more.

Slots Options from Existing Gambling Sites

You'll notice within the list brands that might be better know for sports betting options like bet365 or 888Sport for example.

Few will need an introduction to 888Casino but fewer still may realise that bet365 have an extensive slot site with a huge range of slot games to play.

Non-UK Slots Sites Recently Licensed by the UKGC

Globally there are thousands of different slots sites, but here at OLBG we only list and recommend those with a license to operate legally from the UK Gambling Commission.

It is a desire of many off-shore or 'foreign' slot sites to be able to operate to the UK market, and so we find from time to time, some newly registered slot sites than have been well established outside the UK for much longer, so are not new 'per-se' but are new to the UK

By playing a UKGC Licensed slot site you have some reassurance that the strict operating and player safety measures dictated as essential policy by the organisation are in place and adhered to.

How the Online Slots List is Ranked

The list you see above is ordered by the ratings given by OLBG users. So you can trust that they are in the correct places in terms fo how they are considered by real users and not our reviewers.

If you think a slot site should be higher or lower, from experience of using them, perhaps leave a review of your own for any slot sites you have used, by hitting the 'Read Review' button, where you can ind out everything that the site has to offer, and where the opportunity to leave your own review and score is.

How Much Can You Win at Slot Sites?

Many people do not realise that it is perfectly possible to win huge amounts of money on mobile slot sites. But just how much is it possible to win.

The biggest progressive jackpot games have jackpot payouts growing in size constantly as people play them around the world.

One player collected a cool €18,000,000 playing a progressive jackpot slot in September 2018. Did you know you could win that much?

Of course, sums in the millions are the exception, but there are many different slots paying those king of jackpots and they pay more often than you might think.

On lesser expectation, many standard games will pay anywhere between 1000x and 10,000x bet stake if hitting the very best bonus rounds, or a maximum benefit screen of matching or wild symbols.

The bigger wins are usually found not on standard spins, but within bonus features, scatter wins, or free spins awards within the game features.

What is the Best Online Slot for Me?

There are hundreds of factors to consider when playing online slot games. From themes, features, volatility and return to play percentages (RTP).

Slot Game Themes

One of the deciding factors in choosing a slot game to play is the theme that it is based on. And there is a huge range when we break them down.

People like to choose slot game themes as they may be a fan of a genre like Ancient Egyptian Slots, Irish Slots, Movie or TV Show slots and even Cartoon-based slots like Andy Capp or Top Cat!

Rainbow Riches is one of the most popular slots ever released, so much so it sits in the Classic Slots envelope, but is just one of hundreds of Irish Themed slots that can be found. the best place for these is at Pot's of Luck Casino, an Irish Themed Slot Site!

Different Slot Game Themes
Egypt Irish Luck Animals
Fruits Aztec Sports
Movies Music Game Shows
Cartoons Pirates Underwater
Halloween Christmas Oriental
Voodoo Horror Adventure

Branded Online Slots

One of the biggest slot game themes are branded slots that are based on real TV Shows, Movies, Bands or other International brands that sell a license to use the brand name for a themed slot game. There are hundreds, here is an example snapshot of what you can find

Branded and Licensed Slots
Hell's Kitchen Jurrasic World Game of Thrones
Vikings Beetlejuice Gremlins
Rambo Monopoly Wacky Races
Ted Inspector Gadget Wheel of Fortune
Ghostbusters Jumaji Batman

Slot Game Features

The next consideration in choosing an online slot to play could be the features, and here the choice is vast.

This list of Top 10 Slot game features are just some of the things you can find

Top 10 Slot features

  • Paylines
  • Wilds
  • Free Spins
  • Scatter Pays
  • Cascading Reels
  • Bonus Features
  • Re-Triggers
  • Gamble
  • Feature Buys
  • Random Features
  • Win Multipliers

Slot Game Volatility

The first thing to know about slog game volatility is that it is not RTP% (return to player % - see below)

Volatility is based on the style of wins that are produced and the regularity and level.

Volatility Effect
High Infrequent but large prizes
Medium Frequent and mostly small prizes
Low very frequent small prizes

Volatility has no bearing on RTP

However, theoretical RTP is based on millions of spins, not the number of spins you will play in a session. You can win big on these, but it is more probable you will lose big.

Whatever the volatility, it all plays into the overall theoretical RTP of the slot game.

Advertising volatility of games has become commonplace for slot sites these days. Some players like to win often and will choose a low volatility game for more wins more often and mostly at lower values, but other players prefer higher risk games with fewer wins that pay more when they do land

The common betting game standard deviation is the most often used indicator to represent a game’s volatility. Highly volatile games tend to fall into two categories: "very large but rare" prizes or "small and often". Low volatility games are more predictable, with mostly small prizes falling in the "very small and very frequent" category.

Slot Game RTP

Choosing the RTP (Return to Player Percentage) that suits how you want to play slots, is another consideration.

This is very much a theoretical approach as to a practical one, but something that many players look at to try to get the best odds. It oesnt quite work like that and this article on Slot game RTPs may help - Link to RTP Article-

Video Slots

Video slots are just another way of describing a slot game played online rather than a physical slot game you would find in a casino, bookmakers, bar or amusement arcade

Jackpot Slots

Jackpot slots provide additional ways of winning, usually large pots of money as either part of the overall game, or as (and this is often misunderstood) as a separate game played at the same time.

Jackpots can award a range of sums from small amounts to crazy, life-changing jackpot values in the progressive jackpot range that rise into millions of pounds.

Ignoring the incremental set jackpot amounts, when looking for jackpot slot gams, you are most likely looking for the biggest progressive jackpots that are increased for every spin that every player makes as part of the base game.

A small percentage of you stake will be allocated to the jackpot game, and you will get, if you are very lucky, a random chance of playing for it from time to time. But, rarely I should point out.

For more information on progressive jackpot slots, we have gone in to great detail in our best progressive jackpot slots guide

Classic Slots

Classic slots are mostly either the real deal physical machines you'll find in casinos, bars and Amusement arcades. In the online slot world, I would suggest the video slots that replicate the 'classic' experience are classic slots.

They tend to come with less features, bonus rounds, scatter symbols and pay based on standard game spins.

The other differentiation is the number of reels and win lines that are paid.

People who have only played online slots may be surprised to find that not so long ago, a slot machine, or 'fruit machine' [bacsue the symbols were usually fruits, a bar or two and sometimes a '7', would have only 3 reels and one payline!!

Yes - 1 payline - can you imagine?

They progressed and there were variations of three reels that have 3 paylines with diagonals included or even 5 with three symbols in view taken into consideration. and then some 5 reels versions were added.

None of this megaways and thousands of potential paylines, clusters and more!

So classic slots are usually the more simple slot games with much fewer bells and whistle. 

Oh yeah, there might be bells, they were quite popular too!

Slots Providers

No slot site really has its own slot games. They all use slot providers. Business and studios who develop the software and supply the games to slot sites to include in their slot choice.

It is possible to find slot sites with exclusive titles. perhaps branded to the slot site being used, or on an early release so that only that slot site can use it for some time, before it goes on general release and can appear on many sites.

There are not as many slot providers as there are slot sites, but the list is growing all of the time

Top 10 Slot Providers

This list of top 10 slots providers is based on current top slots. it is not a reflection of if one is better than any other, although many seasoned slot players may have a preference for one or two slot providers over others.

NetEnt

Whether you recognise the name NetEnt or not, if you have played online slots at any time, there is a very high chance indeed, that you have played one of their titles. From Gonzo's Quest to the long-lasting top title Starburst Slot, NetEnt have been supplying the best online slot sites with the best games for years.

NetEnt is part of the Evolution gaming group, the biggest supplier of live casino entertainment games too.

With over 200 games and a history of supplying the top games sites for more than 20 years, NetEnt is a staple provider of all the top online slot sites.

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NetEnt Slots Guide

More information on the Top 5 NetEnt slots available on slot sites as well as information on new games and bonuses, take a look out our NetEnt Slot guide

NetEnt Slot Sites

RedTiger

RedTiger was founded in 2014 and rapidly grew to one of the biggest slot providers offering some of the most sophisticated slot title portfolios, packed full of features and entertainment for players.

Recently also acquired by Evolution gaming and licensed the UK, Gibraltar, Alderney and Malta, they are one of the most popular slot title providers for any online slot site. Games like Dragon Fire in its various forms and Rainbow Jackpots are classic in the feature-laden selection.

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Red Tiger Slots Guide

New Releases and information on the Top 5 Red Tiger slots available on slot sites today

Red Tiger Slots Guide

Play'n Go

Play'n Go is one of the biggest and most popular slot providers to online slot sites. this is no small way because of the constant release of new slots into their portfolio.

In 2020 alone they released no fewer than 52 new slot games for their customers.

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Play'n Go Slot Sites

Find out the top 5 Play'n Go slots available today, new releases, bonus info and where to play.

Play'n Go Slots Guide

Big Time Gaming

Have you ever watched a slot game and heard the ringing cowbell when the big bonus, free spins or jackpot has been one. It is most likely you were watching or playing a Big Timing Gaming slot.

When the cowbell rings, you know you are about to win big.

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Pragmatic Play

With some of the most volatile slots on the market, there are plenty of videos of players winning big when Pragmatic Play Slot pay.

Mobile focussed play is to the fore with a huge range of slots from a wide range of themes, in game features and bonus rounds

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Pragmatic Play Slots Guide

Information on where to play Pragmatic Play slots, new games released this month and bonuses

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SG Digital

SG Digital have one of the largest selections of slot games being provided to one of the widest ranges of online slot sites and casinos.

From Rainbow Riches to Monopoly games, you will surely have come across an SG Digital online slot if you have played before

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PlayTech

The biggest playtech slot you may have heard of is most likely one of the Age of Gods Series. Or perhaps, Buffalo Blitz, one of the most popular online slot games of all time.

Supplying a wide range of online casinos and slot sites as well as powering many with live dealer options, like bet365 and Betfair, Play tech has some of the most popular slot games to be found on the internet

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Novomatic

Often people think Novomatic is a new name in online slots, but they are in fact, one of the oldest online slot providers in the industry.

They produce hundreds of top-quality online slot games, often featuring innovative and exclusive features, and acquired GreenTube gaming to assist with breaking a more prominent fixture in the online games supply

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BluePrint

With licensed titles like World Darts Championship, The Goonies, and more, BluePrint has a huge footprint in the online slot provider world.

With over 50 years experience of providing gaming solutions, they are one of the most popular online slot providers with Big Name titles, and a bigger than average variety of the ever-popular Megaways titles

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Push Gaming

Push gaming have become the stars of many online Slot streams on YouTube and twitch due to the cult status gained from huge bonus rounds wins from games like Jammin Jars and Razor shark

Beginning in 2010, they are one of the newer providers on the market but have sped to the head of the top slot providers for online slot sites

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Push Gaming Slots Guide

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Find your favourite slot and your favourite slot provider at these slot sites.

Slot Provider Slot Game Best Slot Site
NetEnt Starburst Electric Spins
Play'n Go Book of Dead All British Casino
Big Time Gaming Bonanza Casino Lab
Red Tiger Gonzo's Quest Casoola
Pragmatic Play Big Bass Bonanza Slotnite
SG Digital Rainbow Riches Slots Millions
PlayTech Age of Gods Series bgo
Novomatic Book of Ra Pots of Luck
Blueprint Gaming Fishin' Frenzy Kerching
Push Gaming Jammin Jars LeoVegas

Online Slots Sites Bonuses

With so much competition and so many brands of slot sites vying for a huge customer base, welcome bonuses are the norm as a way to incentivise potential customers to take a look at one brand or another.

These bonuses can come in a variety of forms, so let's run through the possible options

Welcome Bonus

Whilst all bonuses are deemed welcome bonuses, for registering a new account and in most cases, making your first deposit, they can be broken down further depending on how the online slot welcome bonus is structured.

Deposit Bonus

A deposit bonus is most frequently bonus credits awarded in relation to the amount you make as a first deposit to a new account.

This could be a 100% deposit match, for example, if you deposit £100, the online slot site would award you the same amount (100%) in bonus funds.

These deposit match bonuses can range from just 50%, right up to some offers in the region of 1000%. The higher percentage multipliers are much rarer though, as you might expect.

Reload Bonus

A reload bonus is an extended form of the deposit bonus, whereby additional deposit match bonuses, based on a percentage of your deposit is paid for subsequent, 2nd, 3rd, 4th and maybe even 5th deposit amounts. 

It is likely that the percentage scale will reduce per subsequent deposit however, do not expect >100% matches over and over again

Free Spins

Offers either as a standalone bonus, or in conjunction with a deposit match, free spins welcome offers are a very common sight. You may be awarded anything up to 100 free spins for joining an online slot site and making your first deposit, but expect the value fo the free spins to be quite low - usually 10p per spin. And then anything you win is often subject to a wagering requirement whereby any winnings have to be staked perhaps 50-200 times before you can withdraw it as cash.

No Deposit Bonus

A rare find indeed. the No Deposit bonus, requires you to do nothing more than register a new account with your personal details and be given free spins at a nominal value to play through on a nominated game.

It is very rare that you will be able to gain any clear profit from this type of bonus as it would not make sense for the slot site to give you an opportunity to win money risk-free, then walk away costing them profit.

View no deposit offers as simply a way to try a slot site out to see if it is somewhere you would like to deposit and play in the future.

Slot Site Bonus Wagering Requirement

A rollover requirement is the number of times the value of bonus funds, often awarded for new customers at online slot sites has to be played before they turn into real, withdrawable cash. This guide will show you how to use the rollover requirement to work out how good the bonus is.

The best slot site rollover requirement is the one that requires the least amount of stake placed before bonus funds turn into real money. Money that is withdrawable. By using the simple instructions below, you can work out for yourself, which is best.

Often the biggest bonus is not the best as rollovers can be high. Cross-reference this simple table to see when a bonus amount is best. And when to avoid.

Bonus Value x10 x25 x50 x100
£50 £500 £1250 £2500 £5000
£100 £1000 £2500 £5000 £10,000
£250 £2500 £6250 £12,500 £25,000
£500 £5000 £12,500 £25,000 £50,000
£1000 £10,000 £25,000 £50,000 £100,000
£1500 £15,000 £37,500 £75,000 £150,000


The table demonstrates that a £1000 bonus with 10x, requires £10,000 stakes to be placed - Whereas a £100 even with a 50x turnover requirement requires only £5,000

Which do you think you would most likely have a chance of having money left with that could turn into cash?

Take the bonus that requires the least monetary value turnover for the best chance of turning it into real cash.

We have a lot more in-depth information on this important topic in the Wagering requirements section of the casino offers page.

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