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CasinoAlpha has a paid partnership for product placement with all the online casino operators listed on the site. Similarly, we receive money from our partners whenever our users click on certain links. Such compensation does not influence our recommendation, advice, reviews, and analysis. We remain unbiased no matter the collaborations we have.
We bring you a list of the best slot bonuses available now in the UK. We’ve spent over 100 hours researching and collecting the best!
Why you should trust us
Why you should trust us
In its effort to incentivise enhancing the online casino quality standards in the UK, CasinoAlpha generated a testing protocol designed explicitly for slots sites.
At least three independent contributors will check all essential areas of functioning for all checked and featured platforms, this being how we review casinos in general. In the case of slots sites, we prioritise aspects specific to the game type:
The number of slots on the site.
The game providers behind the titles.
RTP rates and volatility.
Reels, paylines, and in-game bonus features.
Transparency in communicating game specs.
Interface quality and fidelity.
Bonuses dedicated to slots.
Game variety and presence of jackpots.
Promotional policies for slots.
We use our expanding database of 240+ casinos to create a dynamic and trustable standard that reflects the state of the UK market.
CasinoAlpha found the following qualities to be necessary for slots sites:
Ideal for British Slot Sites:
Number of slots: 1000+
Provideris: 5 or more renowned providers
RTP rates: Aboveabove 96%, 99% included
Reels, paylines, features: More variation
Game spec communication: Specs immediately stated
Interface and performance: Well-performing and pleasing
New members only, must opt in. Min £10 deposit & wager. 30 day expiry from deposit. 18+. Free Spins: on Double Bubble. 1p coin size, max lines. Bingo: Advertised ticket value based on £1 tickets. Game availability & restrictions apply. ‡ Current Jackpots are across selected games. T&C Apply
New customers only. Register with code GAMES100. Deposit and stake £10 or more, within 7 days, on Slots at Betfred Games to receive 100 Free Spins on selected titles. Free Spins credited within 48 hours. Free Spins are valid for 7 days. E-Wallet & Card restrictions apply. SMS validation may be required T&C Apply
New Casino players only. Deposit required. Bet 10+ on qualifying games. 40x wager reqs (bonus only) on selected games. Accept Bonus within 14 days. Bonus valid for 30 days. Certain deposit types excluded. Player restrictions T&C Apply
New players only. Maximum £50 bonus. Minimum deposit: £20. Bonus wins are capped at £500. Max bet with active bonus: £2. Wagering requirement 100% match deposit bonus: 30 times sum of deposit + bonus. Winnings from Free Spins are credited as Real Money without wagering requirements. Some games may not be played with an active bonus. Games may contribute differently when wagering a bonus. Bonus expires after 30 days if wagering requirement has not been met. One bonus allowed per person, address, device, IP T&C Apply
18+. New customers only. Min spend £10 on qualifying games. Certain deposit types excluded. £50 Bonus on selected games subject to 40x wager req. Free Spins for selected game only value 10p each. Must accept within 7 days, valid for 30 days. Player restrictions and T&Cs apply T&C Apply
Welcome bonus package on first 3 deposits 1st Dep. Min £20. 50x wagering (bonus & deposit). max bonus to cash 5x. 20 Free spins. 35x wagering. Max bonus to cash £30. Claim once. See full T&Cs for 2nd & 3rd Deposit offers. T&C Apply
Min. 1st dep. of £20 and above. Max bonus £555 on selected slots; 50x wagering on the sum of deposit & bonus applies. Prize Wheel: Max possible bonus £50, valid 7 days, bonus & wins playable on All slots except bonus excluded games, 20xWR. Max convertible to real is 5x bonus amount received. T&C Apply
UK residents only.Deposits made via e-wallets are not valid for this promo.Min deposit £10.Spins are valid only on Starburst and expire in 5 days. 35x wagering applies.Winnings from bonuses are capped at £100 T&C Apply
18+. New Players Only. Min. deposit £10. Max bonus allowed is £50. Offer duration upon receiving is valid for 2 weeks (14 days). Max Win from spins is £100. 35x wagering applies both for bonus and spins part. Spins are credited on specific games(Starburst). Spins expire after 24 hours if unused. Full T&Cs Apply T&C Apply
First-time depositors only (18+ country restrictions apply). Min deposit: £5. Max offer: 100% Games Bonus up to £30 & 50 Free Spins (on a game of our choice). Promo code: NEW5. Any Games Bonus winnings, if applicable, must be wagered 60x before withdrawal. Any Free Spins winnings, if applicable, will be credited as bonus funds and capped at £5.00. FS are valid for 7 days and any winnings must be wagered 40x before withdrawal. Games Bonus win cap: £100 + original bonus amount. Wagering contribution varies by game. We reserve the right to deny bonuses based on abusive bonus activity across sites operated by the Company. Deposit balance is available for withdrawal at any time (UK only). General withdrawal restrictions & full T&Cs apply. Valid until 31/12/2022 T&C Apply
New players only. 100% bonus on first deposit up to £50 & 20 Bonus Spins. Bonus spins are credited immediately and are valid for Book of Dead slot only. Min first deposit of £20. Max bonus £50. Max bonus bet £5. Max bonus cash-out £250. 40x wagering requirements. Bonus expiry 30 days. Bonus spins expiry 2 days. Game restrictions apply accepted countries: UK only T&C Apply
New Players Only. Min. Deposit £10. Spins Available on Reel Diamonds. Value per spin is £0.10. Winnings are paid to cash balance. Use code 'FREESPINS' on registration. Spins will be credited at 4pm on the day following deposit. 7-day expiration date T&C Apply
New casino players only. Min. deposit £20 with code ‘FIRST200’. Debit card (Visa or Mastercard) only. Selected Slots only, 7 day expiry. Wagering requirements apply, 5 redemption points per £1 to clear bonus. Game contributions vary. Maximum bet £5 per round. T&C Apply
First Deposit Only. Min. deposit: £10, max. Bonus £50. Game: Wild Toro, Spin Value: £0.2. WR of 30x Deposit + Bonus amount and 60x Free Spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the free spin winnings and bonus amount or £5 (lowest amount applies). Spins must be used and/or Bonus must be claimed before using deposited funds. First Deposit/Welcome Bonus can only be claimed once every 72 hours across all Casinos T&C Apply
First deposit only. Min. deposit: £20.Max. Bonus £111. WR of 30x Deposit+Bonus amount (Slots count 100%, other games 10%) within 30 days .Spins Game: Starburst. Max Spins:66. WR 60x free spin winnings amount (only Slots count) within 30 days. Spin value: £0.10.. Max bet is 10% (min £0.10) of the Bonus amount or £5 (lowest amount applies). Bonus must be claimed before using deposited funds. First deposit bonus can only be claimed once every 72 hr across all casinos T&C Apply
CasinoAlpha is the home of the best slot bonuses from UKGC licenced casinos. You can compare dozens of picks with us, get expert guidance, and tips on safe play.
Here is the route of our analysis:
Our slots bonus database
We only use the data we have personally collected in previous investigations. 3 team members focus on a usual casino review through the course of 2 full days while using 3 devices.
For all of the reviews, we have a more refined analysis applied to them. In this case, we look for characteristics that make for a satisfactory gambling experience.
The online slot bonuses
We only present you with offers that we have claimed and completed ourselves. Thus, we can attest to the validity of the presented T&Cs, the glitches encountered, and the likelihood of cashing out.
All slots bonus codes found on our site are also assessed in connection with other types of bonuses and contribute to the overall rating we give to online casinos.
There are two steps when it comes to this feature:
Reading them before signing up, which is something we recommend you do as well.
Confirming that the rules, restrictions and expectations there are met practically when engaged in bonus play.
Only when these two steps are in harmony can we agree to add a casino and its bonus to our curated list.
Accepted slot games specifications
Our main focus falls on 4 elements, which we believe are essential to any UK gambler.
RTP of the game
Return to Player is a theoretical rate that shows you the average return you’ll have over a long period of time. From that, you can approximate a return over your budget.
We only recommend bonus slots that have an RTP of under 95% when we talk about jackpot games, where the rate is lower by default.
Provider behind the game
What software provider created the game you’re about to play means a lot in the context of safe play.
Established names in the industry are known for the high quality of their products, sustaining a good reputation. Some of them are even solely specialised in this game type, making their product better technically.
When we play through an offer, we also look out for game glitches on that particular casino. In the hopes we don’t find any, we also look for:
What happens when a real-money bet is affected by a glitch
How fast and useful customer support is in that situation
How do you avoid or rapidly fix such issues
Can you play on mobile?
Online mobile UK casinos outright dominate the industry. This includes any kind of bonus slot sessions. Knowing what specifications a good quality site or casino app needs to have, we can give you useful insights.
Our main focus is the bonus value and the proportion between it and the money and time invested for that particular bonus. Of course, we take into account how easy and handy it is to complete wagering and cashout, and lastly, the reputation and reliability of the casino operator as a whole.
The casinos we posted above are well-known operators from our best online casinos ranking. Their portfolio is not limited to slots, and the overall customer experience is positive in more ways than just the gambling aspects.
Paddy Power Games slot bonus code
Our reviewers gave a perfect 5/5 rating to the games here, slots included, confirming their quality.
The offers focused on online slots are either permanent or temporary and are mostly deposit-based, with a fair minimum deposit required.
We’ve found top-notch providers in the lobby, like Play’n GO, Big Time Gaming, and Pragmatic Play. Paddy Power Games is also part of our Playtech casino list UK.
You can check the current amounts for jackpot slots in real-time in the lobby.
888casino online slot bonus
From the start, 888casino shows double the number of slot games as compared to the industry average.
The numerous options and the clean user experience prompted our professionals to give it a 5/5 game rating.
The same 5/5 rating was given to its casino bonus range, the majority of which is applicable to slot games.
888casino slots are, in part, created in-house, meaning UK gamblers have access to exclusive games playable here only after they sign up.
NetBet slots with bonuses
While the industry averages +500 slot games per site, NetBet has a catalogue 4 times as big, ranging at over 2000.
The list of providers sponsoring the slot-lobby has more than 30 entries, allowing for variety
We’ve identified and tried both the welcome bonuses and the no deposit bonuses available and gave them an almost perfect rating.
UK players can also play Slingo games, a hybrid that combines slot-machine and Bingo elements
LeoVegas slots promotions
The options here are provided by over 30 game providers, and most of them are accepted games to wager your slot bonus on.
The bonuses we’ve seen may come with no extra wagering attached, which is both rare and convenient
We’ve appreciated the time saved by the search bar in finding preferred games.
There are 4 majorly popular jackpot games in the lobby.
The best slot bonus UK
Paddy Power Games
£40 + 100 extra spins with no wagering
New UK and IRL customers only. Deposits through debit cards only. 40x wagering requirement on bonus, within 7 days, on eligible slot games. Winnings from bonus capped at £500. Spins available upon completion of bonus T&C Apply
Why is this the number 1 UK slots bonus?
The bonus value received is 4 times the amount necessary to deposit, which is also within the industry average.
The number of spins received is high and among the most wanted promotion types.
There is no turnover to complete for the spins, meaning that the amount derived from playing is accessible for withdrawal right away.
The operator is well-known and had an overall good reputation, adding to the legitimacy of the slot bonus.
Our experience had no glitches or issues, and the total rating we gave was 4.6/5.
The next best slot bonuses
Where to play
£88 No Deposit + 200% up to £300
No deposit money: 50x B First Deposit bonus: 30x B
To activate these bonuses, you will receive a code by SMS to validate your phone number first
Despite calling for a double payment than what we’re used to, 888casino has one of the best slots welcome bonuses in an all-round package
NetBet and LeoVegas are shortly behind with a well-off presentation
All 3 bonuses confront you with average, manageable playthrough requirements
Be aware that the spins from NetBet can only be played for 2 days
We advise you to play it safe and claim these slots offers using no other method than a debit card on your name
Best no deposit sign-up offers on slots
50 Free Spins No Wagering
77 Free Spins No Deposit
50 No Deposit Spins on Book of Dead
Why we selected these no deposit sign-up bonuses
Betfair’s no deposit registration offer strongly resembles Paddy Power’s best slots bonus
However, Betfair will let you play your spins in Gonzo’s Quest Megaways besides the identical selection of daily jackpot games
We singled out 777 casino and Fruity Casa as advantageous sign-up bonuses, too
You can play many games and wagering requirements are not that scary
Still, we’re not fans of 777 casino’s £10 cap on free spins slots winnings (paid as bonus funds and to be converted into a max £100 after playthrough)
Types of slot bonuses
Online slot sites are versatile in types of offers as well as game variety, theme and settings.
We want your experience to be both safe and gratifying. This is our priority. We firmly believe that such a thing is impossible unless you’re well informed. That is why we want to explain each subtype and present your best option.
Free spins promotions
Slots are naturally linked with free spins with no deposit required. These are basically casino bonus codes that allow rounds in your session without the need for you to make a deposit prior. You may also come across numerous free spins no deposit mobile verification UK offers or add credit card free spins, which requires players to offer a guarantee of their identity to the casino in exchange for the rewards received.
Primarily because our participation in the bonuses reached our high standards. The bonuses looked and proved to be compliant with the UKGC directives. We gave the sites high ratings; most of their features are way above market averages, and they constantly update their products to keep up with users’ needs.
To get started with this type of offer, 10 free spins and 20 free spins catalogues of offers are a good starting point. They are usually budget-friendly and completing their turnover will not take up too much of your time.
Slots deposit bonus
The best casino bonuses are promotions activated by payment and can be a way of using your gambling bankroll. That depends on the terms imposed and how well you budget and spend your time.
The subtypes are quite numerous, and thus, you can find one that suits you the best. But we have a shortlist prepared for you here.
The most attractive feature is the absence of required wagering. Moreover, the games accepted are popular and allow for an interactive experience. We rated the terms and their implications as fair and were able to proceed to cashout without any major issues arising.
Protect your budget by limiting your spending on casino gambling and choosing a minimum deposit casino. It is a type of website that admits users to the entirety of its services for payments of between £3 and £20.
No deposit slot bonuses
In the UK, no deposit casino bonuses are play opportunities activated after a certain step, usually signing up, without the need for prior payment.
Obviously, their features make them sought-after. Let’s see what we recommend in conjunction with online slot play.
Usually, the normal bonus value is not high by any means. After all, that would ultimately be disadvantageous to the casino. However, our top 3 include casinos that go over the usual £3 to £5 range. In addition, we gave them good bonus ratings in our review, meaning our opinion was positive, the terms were fair, and our cashout process was smooth.
In the hopes of allowing UK players to engage in cost-effective gambling, we have compiled a list of slots no deposit with tons of information that can be easily applied when playing,
Cashback on slot promotions
Cashback bonuses are rare options allowing the gambler to receive a fixed percentage of the prior losses in the form of bonus funds. As expected, both the loss and the derived funds are often tied to slot play.
Even though cashback offers are seldom found, that does not mean that our expectations of high-quality decrease by any means. Thus, we picked casinos that genuinely offer a notable value without imposing an unreasonably high limit on your losses. We also looked at the frequency with which they’re given out, and we made sure the wagering requirement is not too high, a common practice when it comes to these bonuses.
No wagering online slot offers
No wagering bonuses work differently than usual. Once you have played the funds or spins allocated, you don’t need to bet on it anymore. You can proceed to cash out, that is, if you have any derived profit.
Obviously, the wagering part we look at intently in different cases has no play here. However, we still scan for abusive terms and conditions, the easy-to-follow rules, good gameplay and smoothness with the processes involved, such as deposits, live chat interactions and withdrawals.
The answer is quite simple: the topping RTP ranges of all 3 games are hard to compete with. Of course, a good-rated game needs to have pleasing visuals and sounds. And, it must allow for setting customization and good ranking features. These 3 contain the complete package.
A top-rated slots bonus for UK players is ideally paired with these games or other similar options of this kind.
Popular jackpot slots with bonus options
Absolutely Mad Mega Moolah
These games have had outcomes of millions of GBP when someone hit the jackpot. However, that is rare and playing on them constantly may be disadvantageous long-term since their RTP is under 90%.
We know that such games seem attractive and that thousands of UK gamblers bet on them daily. However, we want you to be informed and know when to limit your play. You need to have a healthy approach to gambling and stick to your budget.
Never exceed your budget. To manage it easily, set your sum and schedule your sessions weekly. Use the available responsible gambling tools whenever you can.
Terms and conditions to consider
All bonuses come with a set of rules, part of the Terms & Conditions you agree upon when you first sign up.
T&Cs are the equivalent of a digital contract and you clicking on the “I agree” button is the equivalent of your signature. T&Cs can be changed at the casino’s discretion, but any changes regarding them need to be communicated to you in due time.
Not following the provisions there may result in you losing the slot offer or, even worse, getting your account suspended.
To avoid that, watch out for:
Wagering requirement & contribution
Average wagering of a bonus
35x – 50x
Average slot contribution
Average wagering timeframe
7 days – 30 days
These are the ranges that are most likely linked to the bonus you’ll eventually choose. If they are different, you need to calibrate your playtime and strategy well.
Unless you complete all the bets to satisfy the wagering requirement, you won’t be allowed to cashout.
Payment needed & cashout limit
Average deposit limits
£5 – £100
Average cash out limit
4 times the bonus amount
Usually excluded payment services
Skrill Moneybookers, Neteller, Crypto wallets
Your bankroll is the second most important thing after your health when it comes to gambling.
Thus, following the T&Cs specifications will make it easier not to affect your budget.
Please note that the data in the last table is strictly general and changes to a specific slot promotion that you will engage in are very likely to occur.
All bonuses come with an expiration date, calculated by the time you start playing it. During that time you will be able to play and, within the same timeframe, you need to complete the turnover.
It is important that you segment your time well because once a promotion expires your funds will be gone and not in any way usable.
When you’re given a bonus, it is likely that restrictions will be imposed on particular game titles. usually, disavowed games will be progressive or jackpot slots. Even so, read your terms carefully and figure out the specifics.
Pick any offer from our list that conforms to what you’re looking for.
Click the blue “Play” button.
Read the landing page instructions carefully.
Sign up by creating an account.
Use the bonus code when needed, taking it from the top part of our bonus boxes.
When needed, confirm your account.
Make the necessary payment and wait for it to be processed, unless it is a payment-free offer.
You’re all set, you’re now ready!
Save time from waiting on the cashout process by completing the KYC practice close to the moment you’ve signed up.
High RTP slots to combine with your bonus
Play’ n Go
Eye of Horus
Reel Time Gaming
Twin Spin Megaways
Fire and Gold
Best payout slots
New players are advised to opt for high-RTP games and low variance slots for stable payouts
Our experts studied eCOGRA and other relevant audit reports to confirm those numbers
We also compared the reports with the official info on the game provider’s site
As a rule of thumb, you should remember that even though it increases your theoretical chances, choosing a high RTP game doesn’t guarantee success.
Understand slots range of bets
Luck o’ the Irish
Book of Ra
While testing UK’s slots promotions, we played games which technically allow large bets per spin.
Be aware that a £500 spin on Luck o’ the Irish will certainly forfeit a bonus in this game since the maximum bet with extra funds is generally set at £5.
Maximum bet limits may vary from one casino to another.
How to cashout without issues?
Make sure your profile is complete and has all your accurate data filled in.
Complete the wagering requirement beforehand.
Pick a withdrawal method that you’re familiar with and it’s accepted by the casino.
Check for fees, and, if there are any, choose an alternative.
Request your cashout.
After the specified waiting time, your funds should be in your personal banking account or e-wallet.
Waiting times contain two parts, the casino’s time to check for any inaccuracies and the payment method processing time.
You can find the waiting times for all the accepted withdrawal services on our reviews.
Banks don’t process payments during weekends or holidays, thus, they have the longest intervals by default.
Features to look for in slot bonus codes
Your offer and the casino that created it need to meet the following requirements to achieve good quality:
Licence from the UKGC
In the United Kingdom, all online gambling services need to have a valid licence from the country’s official Commission. They assure fair gaming, methods of player protection, and protection of your data and funds.
All of the casinos on our sites have an active UKGC licence, so you need not worry about that. We’ve got you covered.
Game variety accepted by your bonus
We can confidently say that having multiple options when completing a bonus turnover constitutes an advantage compared to a single option.
No matter how much you prefer a game, having variety will break the monotony of your sessions.
Even so, we know that players look for slot bonuses personalised for a single game. In our listing, you’ll find both types, so we have a choice for you.
Mobile usability of your offer
Mobile phone usage makes up for around 80% of online gambling in the UK as well as worldwide. Thus, it is very likely you’ll want to play your promotion on your phone.
So, pick a casino that has a good rating in our User Experience section.
Reliability of the casino
Check our review before choosing any bonus. We go through the entire site and test its features. Then, we proceed to give objective ratings.
Any operator on CasinoAlpha that has a general rating of over 3.5 is reliable on multiple fronts.
Good customer support
Help to rely on when something goes wrong is essential. Thus, you need to know beforehand if the support agents give useful answers and how much time it takes to solve an issue.
Good thing that we do that for you with each review through the Customer Support section.
Slot machine play is fast-paced and catchy; therefore, it can be very easy to lose track of time.
Responsible gambling tools may limit your sessions by time, payments, losses, or simply through reminders.
Our advice is to choose an offer from a site that has a wide selection of such tools. In our reviews, you can see their catalogue and how to use them.
Pros and Cons of slots bonuses
This allows you to access popular game titles within the most popular game category in the industry.
Most of them have a medium-sized wagering requirement.
They are easy to find and have multiple subtypes.
They are easy to play with and don’t require a complex strategy.
Some of them come without a turnover.
Sometimes, the availability of the bonus is small and puts time pressure on you.
They may be fixed for a single game.
By constantly improving our products, we build a relationship of trust between our users and us. That includes using references, sources, and techniques that are safe, clean, and vetted.
We always start from internal data extracted from our database, which we build in time without time shortcuts.
Then, we analyse each slot bonus through the lens of industry standards and player needs, which we know first-hand.
Lastly, we look at the related games by their settings:
Since forever a student of life and writer at his core, he loves to place bets on football matches in his spare time. Combining the art of prediction and a rigorously trained intuition, he has joined the iGaming world to promote a responsible and data-driven approach to sports betting.