Top Profitable Slot Sites to Put On Your Radar in 2021

Slot sites are online platforms where gamblers can play their favourite slot games for free or for real money.

Best UK Slot Sites to Register on in 2021

50 Free Spins on Starburst
  • Party time jackpots
  • Frequent offers
  • Over 1000 slots
* more terms & conditions apply

18+. New depositors only. UK residents only. Minimum deposit £10. Free Spins are valid only on Starburst and expire in 7 days. 10x wagering apply. Certain deposit types are excluded. T&Cs apply. 

£88 No Deposit Bonus
  • Free-play available
  • Exclusive jackpots and slots
  • Mobile app
* more terms & conditions apply

18+. New players only • Claim within 48 hrs • 14 day expiry • FreePlay (FP) wins credited as bonus & capped at £10, excl. JP wins • Valid for selected games • Bonus wins capped at £500, excl. JP wins • Pre-1st deposit only: Bonus wins & max redeemable amount capped at £100, excl. JP wins • 50x wagering – req. vary by game • Bonus expires in 90 days • Withdrawal restrictions, T&Cs apply. 

Jackpot Village
100% up £500 + 50 Free Spins On First Deposit
  • Huge jackpots
  • New slots
  • Over 70 game providers
* more terms & conditions apply

18+. New players only. 1 bonus offer per player. Min. deposit £20. Max. bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Winnings from Bonus spins credited as bonus funds and capped at £20. Bonus funds expire in 30 days, unused bonus funds will be removed. Welcome Offer is 100% match up to £500 + 50 bonus spins on your 1st deposit, 25 match up to £800 + 25 bonus spins on your 2nd deposit, and 50 match up to £500 + 30 bonus spins on your 3rd deposit. Bonus funds are separate to Cash funds, and are subject to 40x wagering the total bonus & cash. Only bonus funds count towards wagering contribution. Terms apply.  

100% up to £200
  • Over 300 slot games
  • Android and iOS app
  • 24/7 assistance
* more terms & conditions apply

 18+. 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+Cs apply.  

Jonny Jackpot
500 Free Spins Welcome Package
  • Many safe payment options
  • Loyalty program
  • Live chat
* more terms & conditions apply

18+. New players only. One welcome package per player. Max bonus bet £5, Min deposit £20, 1 st deposit: get 100 bonus spins, 2 nd Deposit: get 75 bonus spins, 3 rd deposit: get 125 bonus spins, 4 th deposit: get 50 bonus spins, 5 th deposit: get 150 bonus spins. All spins are on slot game Book of Dead only. Bonus funds must be used within 30 days and bonus spins within 10 days. Spins winnings credited as bonus. Max winnings from bonus spins are equivalent to the number of spins awarded. Bonus funds separate to Cash funds, and are subject to 35x wagering and withdrawal requirements. Terms Apply. 

50 Free Spins on Book of Dead
  • No wagering free spins
  • Daily jackpots
  • Bonus wins paid in cash
* more terms & conditions apply

First deposit only. 50 Free Spins on the Book of Dead slot. Minimum deposit £10. Each Free Spin valued at 10p. OJO’s Rewards and Game Play policy applies. 


100% up to £200
  • Over 4000 games
  • Quality software providers
  • Slot battles
* more terms & conditions apply

New players only. Min deposit: £10. Account balance is withdrawable at any time. Upon withdrawal, any remaining bonus spins are forfeited. 7 days to activate the spins. Bonus spins expire 24 hours after activation. Full T+C apply. 18+. Play responsibly.

Deposit £10, get £40
  • Cash-back on slots
  • Casino tournaments
  • Mobile app
* more terms & conditions apply

* 10 free spins on registration *Free spins on first deposit as follows :Deposit £10 or more and receive 40 free spins * Deposit £50 or more and receive 90 free spins * Deposit £75 or more and receive 140 free spins *Deposit £100 or more and receive 190 free spins *Free Spins (35x wagering) *Deposit Bonus (35x wagering) *Further T&C’s apply. 18+. 

100% up to £100 + 200 Free Spins
  • VIP program
  • Over 200 games
  • Large slot jackpots
* more terms & conditions apply

New customers. 20 spins for selected aotg slots credited on reg, 180 (20 per day) following first deposit. Spins valid for 24 hours, exp in 30 days. Winnings credited as bonus funds with 20x wagering, max win £100. Min £20 dep for bonus funds. 40x wagering, game weighting/ restrictions, betting limits. Casino-only bonus. Selected games only. Not available on ios app. Payment restrictions + t&cs apply. 

100% up to £500 + 50 Free Spins
  • New slots
  • Android app
  • Many deposit options
* more terms & conditions apply

 18+. New Players Only. 1 bonus offer per player. Min. deposit £20. Max. bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Winnings from Bonus spins credited as bonus funds and capped at £100. Bonus funds expire in 30 days, unused bonus funds will be removed. Welcome Offer is 100% match up to £500 + 50 bonus spins on your 1st deposit, 25% match up to £1000 + 50 bonus spins on your 2nd deposit, and 50% match up to £500 + 25 bonus spins on your 3rd deposit. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds count towards wagering contribution. Terms apply. Please gamble responsibly. 

Slot Sites Explained

When we say slot sites, most of us picture our favourite online casino – and we wouldn’t be entirely wrong. However, the term “slot sites” can broadly refer to any of the following:

  • Websites that provide access to slots for free – such is the case of Gaminator or, social casinos with a library of classic slots that anyone can play for free.
  • Centralized platforms belonging to a single entity – local or international casinos such as PartyCasino or 888.
  • Decentralized platforms or blockchain slot sites – here we refer to casinos that either use blockchain technology to ensure fair odds for their slots or operators that accept cryptocurrency for gambling – e.g., mBitCasino.

What you need to know is that, depending on the type of slot site you choose, you may need to pass a registration process that often involves disclosing personal information.

This is also known as KYC or Know Your Customer check.

In almost all cases, local and international casinos have to do these checks on their potential customers due to regulations and to verify they are of legal gambling age.

Some blockchain slot sites and other platforms that offer free-play may allow you to try their games anonymously.

For example, websites such as require absolutely no identity checks and you even get a fixed number of demo credits to play with.


How to Choose the Right Slot Site

Choosing the right slot site is always a matter of preference and figuring out what type of player you are (privacy-seeking, casual, high roller etc.). Your budget and goals can also help you determine which online slot sites will best fit your needs.

Some other objective criteria you can look into are:

Slot Diversity

Ideally, a quality platform should have at least a few hundred slot games to choose from, available for free or for real money play that cover a wide range of themes – adventure, safari, TV, music, pop culture, Vegas, mythology etc.

Your best bet is to always go for an operator that specialises in slots or makes them a central part of the offer. Such is the case of casino operators like VideoSlots, which has over 4000 slots to choose from.

Moreover, your casino or platform of choice should offer the most popular slot types – 3-reel, 5-reel, progressive jackpot slots, megaways, multiline slots etc. It’s also important for the offer to be updated weekly or monthly with the newest titles.

Win Potential and RTP

A good way to gauge if a slot site is profitable is to look into aspects such as:

Understanding Win Potential
  • Individual slot RTP – this is usually disclosed in the game window for each title: most classic slots have an RTP of 95%, which is considered a good medium range, with some progressive titles reaching RTPs of up to 99%.
  • Total games payout – this is an average of the payout percentage for all games offered by a particular casino – some operators will also disclose which percentage of the total is represented by slots.

To make things easier to understand, here’s a practical example with one of the best slot sites uk, PlayOJO:

Playojo welcome offer

As you can notice, the total games payout for PlayOJO casino is over €100 million. And if we dig a little deeper into their offer, we can see that slots represent a large chunk of it, followed by smaller percentages for table games and card games.

That, coupled with the fact that Wolf Gold, a progressive jackpot slot, is the highest paying game tell us PlayOJO is one of the best slot sites for winning and a profitable choice for slots fans in general.

This is an easy assessment tool that you can use on any slot site out there.

Safe Payment Methods

For top slot sites, the safety of player funds is always a priority. That is why you’ll see them only integrate with globally recognized payment processors and offer additional security measures (e.g. 2-factor authentication, touch ID).

The best slot sites should offer you multiple deposit and withdrawal options, such as:

Slot Bonuses

Receiving regular slot bonuses is important, especially for new players but also for veterans. The best slot sites always make sure to offer at least one of the following:

  • No Wagering Free Spins at the most popular slots such as Book of Dead or Starburst, as part of the welcome package or on a weekly basis.
  • First deposit bonuses – new slot sites usually prefer to match your initial deposit but you can also find casinos willing to give you up to 200% bonus on your first deposit.
  • Individual slot bonuses – one of the most sought after bonus types out there, especially for fans of new slot launches and a promotional tool used by casinos to attract more foot traffic to a certain title by offering free spins or cash-back.
  • VIP privileges – even if your slot site of choice doesn’t have a VIP program, it should still have a loyalty system in place that rewards regulars with privileges such as higher deposit limits, instant withdrawals or cash bonuses.

Mobile Pay

Because the number of mobile users is expected to rise to 3.8 billion in 2021, another strong argument to choosing one slot site over the other is how mobile-friendly it is.

The best case scenario is to look for slot sites that offer:

  • A great selection of mobile slots – for instance, Starburst, Shining Crown or Burning Hot are great for mobile gambling because they play well on a small screen and any reputable mobile casino should have them.
  • A mobile optimized platform – in 2021, it’s a no-brainer that a large chunk of potential clients will access from a mobile device the first time and the best slot sites are optimized by default.
  • Dedicated mobile apps – for example, UK slot sites such as 888 and are already ahead of the curve and cater to both iOs and Android users.
  • Safe mobile pay options – if you’re predominantly gambling on your phone, look for slot sites integrated with Google Pay, Apple Pay, Boku or Siru so you can deposit, withdraw and play on a single device.
Terms and Conditions Terms and Conditions

Any bonus sounds good on paper, but it’s actually the terms and conditions that determine how advantageous it truly is.

What is important to remember, especially if you’re a new player, is that terms and conditions attached to various bonuses should always be transparent, easy to understand and fair.

They should be designed to profit both the player and the casino, not just the latter.

The two most common terms and conditions to pay attention to at most slot sites are:

  • Wagering or rollover requirements – most welcome bonuses or first deposit bonuses come with wagering requirements, meaning that you have to bet the bonus amount a certain amount of times before you can withdraw. For example, if the bonus is „100% up to £100” and has a wagering requirement of 25x, you have to bet the bonus amount 25 times before you can convert it into actual money. A good ratio should be between 10x to 25x – the higher this requirement is, the harder it is to meet and, consequently, the bonus is less attractive.
  • Payment method eligibility for various bonuses – another important aspect to keep in mind is that you can meet all eligibility criteria for a bonus but, if you didn’t read the fine print first, you can be unpleasantly surprised to find out your chosen deposit method is not included in the offer (usually it’s the case of e-wallets).

Top Slots to Play at Slot Sites

Now that you’ve figured out how to choose the right slot site and what you can expect in terms of bonuses and perks, you may be wondering what slots you should choose as a first time player.

Here are some high quality, profitable slot picks in 2021:

#1 Razor Shark

Razor shark slot screenshot

If you’re a fan of maritime slots and ready to dive into the depths of the ocean in search of hidden treasures, then Razor Shark is a great choice to put on your radar. Developed by Push Gaming, with a classic structure of 5 reels, 3 rows and 20 fixed paylines, this slot offers a nice payout of up to €50 000 and a free spins round with multipliers. You can bet as little as €0.10 up to €100 per spin – but be mindful this is a highly volatile slot. The RTP score of 96.70% is above average, making it a hugely profitable title.

#2 Piggy Riches

Piggy Riches slot screenshot

Everyone likes the sight and especially the sound of a full piggybank. Because Netent understands our intrinsic need to get rich whilst having fun, it released Piggy Riches on the 5th of September 2010, a medium variance, 5 reel, 3 row slot with a fun theme and great win potential. Featuring special symbols evocative of wealth such as golden coins or cash spread across 15 paylines, the slot will reward you with a max. win of up to 2000x your stake. Anyone can go from rags to riches, since the betting range is very flexible – €0.01 to €0.5 per spin.

#3 Reactoonz

Reactoonz Slot Screenshot

If you’re intrigued by space ships and alien creatures, you’ll definitely love Play’N Go’s slot, Reactoonz. Playable across all devices, this 2018 release has an explosive RTP of 96% and a high level of volatility. What makes it particularly interesting is the 7×7 grid structure and the cluster pays for 5 symbols of the same type (or, in our case, 5 aliens of the same race). Your wins can get even bigger depending on the size of the cluster and the wild symbols and multipliers add to the excitement every round. The maximum jackpot you can win is 91 406 coins.

Player Safety At Online Slot Sites

First time players and veterans alike are always concerned with how the casino keeps their information and funds safe. It’s a growing concern in an ever-connected virtual world where cyber attacks happen on the regular.

The best slot sites will usually have the following safeguards in place:

  • Data confidentiality – before you sign-up, you should be presented with a clear picture of how your personal data gets used and be guaranteed that it doesn’t get sent to any third parties without your consent. If you’re in the EU, for example, the slot sites you play at should be GDPR compliant (General Data Protection Regulation).
  • SSL certificates and firewall – it goes without saying that quality slot sites make sure to encrypt any sensitive information you share to avoid cyber attacks. You can manually check what kind of SSL certificate a platform has by using a tool such as SSL Shopper.
  • Licensing – slot sites can be licensed by various regulators depending on the jurisdiction they operate in. Some trustworthy names to look for are UK Gambling Commission, Malta Gaming Authority, Gibraltar Gambling Commission or the Curaçao Gaming Commission. Always check if the slots site you want to register on has a valid license and isn’t on any government blacklist.

Another final aspect that not many people would think to include in the „player safety” category is actually customer support.

Think of customer support as the best tool to determine how much a casino actually cares about its players, beyond the clever marketing, flashy images or colourful banners on the platform.

A reputable slot site should have responsive customer support, preferably 24/7, on multiple channels and be ready to assist players in real-time, especially if they have an emergency regarding their funds or account.

A great idea before signing up on a slots site is to actually test this – send an e-mail, open a live-chat detailing a common, fictional player problem and gauge the response rate.

A good response rate should be between 24-48 hours if you reached out by e-mail or instant if you opened a live chat.


Slot Sites Software Providers

When it comes to registering on a new slots site, it’s important to check the list of software providers that particular operator works with. The software used dictates the quality of the player experience, but also the potential payout rates.

Our general advice is to always stick to market leaders if you want to get the best out of your gaming session and enjoy fair odds every time.

For example, software providers like Bally, Cryptologic and IGTare frontrunners in the industry, meaning they have been around for decades and have played a huge role in innovating the slot machines and game mechanics we have today.

If you’re a fan of classic, Vegas-style slots featuring fruit symbols, bells and 7’s, your best bet is to find slot sites powered by EGT Interactive orNovomatic. Both companies are known for consistently delivering high quality classic slots like Burning Hot, Shining Crown, Lucky Lady’s Charm Deluxe, Dolphin’s Pearl etc.

Last but not least, if you’re after explosive jackpots, then you should look into slot sites that offer many titles from providers like Netent, Microgaming, Playtech or Wazdan. These providers tend to focus a lot on high-paying slots like Mega Fortune, Mega Moolah or Age of The Gods and have turned many people into millionaires.


How to Win More on Online Slot Sites

As much as we’d like to tell you the opposite, there is no guaranteed way of winning every single round, even if you join the best slot sites. However, you can use a lot of the perks the operators offer to boost your chances, such as:

  • Gain access to slot tournaments with big prize pools – large operators like to organize slot tournaments on a weekly or monthly basis and they are a great way of gaining access to million dollar prizes and enjoy some friendly competition on the side.
  • Huge jackpots – operators such as Mansion Casino and Party Casino, for instance, are known for offering above average jackpots that you can take advantage of weekly or even hourly.
  • Free sign-up bonus – if you’re a beginner looking to venture into the wonderful world of casino games, our best advice is to look for new slot sites with a free sign-up bonus that consists of a cash prize or free spins that you can claim immediately, without any wagering requirements (e.g. 888, one of the best new slot sites in the UK currently offers £88 without deposit to all new users).


New Slot Sites in 2021

If you’re looking to stay up to speed with the best new slot sites in 2021, we’ve scoured the market for you and identified some up-and-coming operators that deserve your attention:

New Slot Sites in 2021

100% up to £100+ 300 Free Spins
  • Many deposit options
  • Hundreds of classic video slots
  • High quality live casino
* more terms & conditions apply

Full t&c's apply. New players only. £10 min deposit. £5 max bet using bonus. 40x wagering applies. Bonus valid for 14 days. 30 spins will be credited instantly upon qualifying deposit + then 30 per day for 9 days on pre-selected games. Free spins valid for 72 hours from credit. Max free spins winnings £100. Ewallets excluded. 18+. 


Captain Spins
100 Free Spins on First Deposit
  • New promotions every day
  • High RTP slots
  • Great game selection
* more terms & conditions apply

18+. New players only. One welcome package per player. Max bonus bet £5, Min deposit £20 1st deposit: get 100 bonus spins, 2nd Deposit: get 120 bonus spins, 3rd deposit: get 140 bonus spins, 4th deposit: get 160 bonus spins. All spins are on slot game Book of Dead only. Bonus funds must be used within 30 days and bonus spins within 10 days. Max winnings from bonus spins are equivalent to thenumber of spins awarded. Spins winnings credited as bonus. Bonus funds separate to Cash funds, andare subject to 35x wagering and withdrawal requirements. Full Terms Apply

100% up to £99 + 99 Free Spins
  • Top software providers
  • Cash-back offers
  • Slingo games
* more terms & conditions apply

18+. New customers only, min deposit £20. Wagering 40x bonus. Max bet £5 with bonus funds. 100% up to £99 bonus and 99 free spins on 1st deposit. Eligibility is restricted for suspected abuse. No max cash out on deposit offer. Welcome bonus excluded for players depositing with Skrill or NetellerFull T+Cs apply.  

Why Play At a New Slot Site

Are there any benefits to choosing the new players in town as opposed to the world-class operators who have been around forever?

Well, you may be surprised to hear that there are quite a few advantages to choosing a new slot site:

  • Better promotions for new players – sometimes market leaders tend to slack off once they have a solid player base, whereas new operators will always try harder to attract newcomers, especially at the beginning. That is why it’s common to find better promotions at new slot sites, such as a more consistent welcome package, free spins or various promo codes to use.
  • Greater focus on innovation and improved tech – new slot sites are always dedicated to bringing fresh experiences to their players, whether that’s through VR games, 4k live casino streaming or even by offering social slots that encourage interactivity and gambling for fun.
  • A frequently updated games library – if you’re eager to be the first one to spin the reels on the latest launches by your favourite game providers, you have a better chance of finding them at new slot sites.


Why Sign Up to Slot Sites?

There are many strong arguments to signing up on slot sites.

Whether you like to play for fun or for actual monetary gain, slot sites are a great way of connecting you with your favorite title in one click, from any device. You can spin the reels at home or on the go, all you need is internet connectivity.

Another reason to consider signing up to a slot site is the access to exclusive promotions and bonuses. Many of them can be claimed for free, without deposit – who wouldn’t want to enjoy a few rounds on the casino’s money?

Lastly, slot sites are great for building communities because they encourage interaction with other players via live game rooms or chat.


Slot Sites – Mobile and Free-Play

If you’re looking for the best mobile slot sites, you have two options you can go for:

  • Established operators that offer mobile apps, a fully functional mobile platform or a large variety of slots that play well on mobile – e.g. Unibet, Mr. Green, Genesis, Mansion Casino, Paddy Power.
  • New operators – don’t discount new operators just because they haven’t been around for too long, there are many who offer outstanding, competitive mobile platforms or apps (e.g. Mr. Play, PlayOJO, Casimba).

If you’re only looking to play for fun, there are plenty of alternatives that involve no risk and allow you to disclose as much personal information as you want:

  • Free slot sites without registration – these types of websites allow you to play the newest slots for free, anonymously in your browser or by downloading a mobile app and they have a very wide selections of games, ranging from 30 to over 9000 (e.g., You can also find many safe apps on Google Play that give you instant access to millions of titles (e.g. Heart of Vegas, Cashman Casino slots, Caesars Casino app etc.).
  • Free slot sites with registration – if you’re comfortable disclosing personal information such as name, address or phone number, you’ll be pleased to know most large casinos allow you to play the demo version of popular slots like Mega Moolah or Book of Dead. Some even offer you free credit or a fixed number of free spins to start.


Slot Sites Summary

Slot sites are a great way to enjoy slot games in a safe environment for free or to earn cash prizes.

If you’re looking to play for fun, many websites offer free credit to play with, mobile apps that you can download or insta browser play for hundreds of slot titles.

If you want to win big, online casino operators are ready to welcome you with progressive jackpots, frequent promotions and VIP programs.

Finally, for players who seek to stay connected with the latest developments in the iGaming industry, new slot sites are a fantastic choice.

With improved technology and innovative titles (blockchain games, VR games, social games etc.), new slot sites are always ready to take your gambling experience to the next level.


Best Slot Sites FAQs

Can I play for free on slot sites?

Yes, free play on all devices is available on multiple slot sites and online casino platforms (e.g., Hollywood Casino, Twin Casino etc.).

❓ Which slot site offers the highest returns?

Generally, you have higher chances of making big bank if you sign up on slot sites with high jackpots such as Mansion Casino, Jackpot City, Dream Vegas or Royal Panda.

❓ Should I choose a local slot site or an international one?

If you’re looking for localized experiences, payment methods and native dealers, your local slot site can be a great choice. However, international casinos offer higher jackpot values and more substantial bonuses.

Can I play from a mobile device on slot sites?

Yes. Most slot sites are mobile-optimized or offer dedicated mobile apps you can easily find on Appstore or Google Play.

❓ What rewards can I get for signing up on a slot site?

The most popular ones are no deposit bonuses, first deposit bonuses, free spins at registration, loyalty points or refer-a-friend bonuses.

❓ How do I choose a safe slot site?

The most important aspect to check is always licensing – most online casinos list their license number and the name of the regulator in the footer section on the homepage (e.g. Malta Gaming Authority).

❓ Do I need to pass KYC to play on a slot site?

Not always. Some websites such as allow you to play without KYC. However, it comes with restrictions (access to a limited number of slots, no possibility to cash-out, small bonus credit to play with etc.).

❓ Which slot sites offer a no deposit bonus?

888, LeoVegas, PinkCasino and are just some examples of slot sites that currently offer no deposit bonuses (free spins or cash).

❓ If I earned free spins on a slot site, can I use them on any slot I want?

It depends. Some casinos explicitly state which slot or slots you can use the free spins at, whilst others allow you to use it at any title in their offer.

❓ Do online slot sites have fair odds?

If they are licensed and regulated and work with audited software providers, then yes. In this case, they are obliged to disclose the RTP rates for their every slot.

❓ Can I win big at online slot sites?

Yes. Many punters have won millions on very small bets of only a few cents. If you’re looking to win big, progressive jackpot slots are the way to go.

❓ What are the most popular games at slot sites?

Starburst, Mega Moolah, Book of Dead, Book of Ra and Gonzo’s Quest are some of the most played titles worldwide.

❓ Are new slot sites worth it?

Yes. New slot sites are at the forefront of innovation. They are an inspired choice for gamblers who want access to substantial promotions, state-of-the-art platforms and new game types.

❓ Can I win real money on slot sites?

If you play with real money, yes, but if you use demo credits, you can’t transform your paper earnings into actual money until you make a deposit.

Cristina Tudose

Cristina Tudose

I’ve been writing for the online casino industry for over 2 years now. During this time, I became passionate about player-centric content, especially slot and brand reviews.


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