The best slots bonus gives you extra credit to play your favourite games and machines.
Almost every online casino has a selection of slot games. Why? Because slots are easy to get the hang of, plus they’re a tonne of fun — and if you’re lucky, you’ll be greeted with a generous welcome bonus and a handful of other bonus offers as you play.
Most gambling websites feature a range of rewards — such as 50 bonus spins or a deposit match — when it comes to playing online slots. But not all bonuses are worth your time. With a range of rewards on offer, it can be difficult to know what the best slot bonus looks like.
Here at OnlineCasinos.co.uk, we have reviewed the best online casinos for UK players, so you can find the best slots and enjoy the most generous bonuses. Read this guide and discover the rewards that matter to you and fit your playstyle.
How we review the top online slots bonus casinos
OnlineCasinos.co.uk provides you with comprehensive (and trustworthy) reviews written by the savviest minds in the gambling industry. We do this all to bring you the highest quality advice when it comes to finding the best online slots bonus.
Using our experience of classic casino games and sports betting, we find the best slots bonuses by covering the information that most affects your gaming experience:
Free spins
Deposit bonuses
Wagering requirements
Payout (RTP)
Combining our industry knowledge with a passion for playing the slot games you love, we review the top UK online casinos from a player’s point of view. But we don’t stop there. Our team also asks the right technical questions with full transparency, while abiding by the compliance rules outlined by the UK Gambling Commission.
Safety and security at online slots bonus casinos
Your safety and security are taken seriously here at OnlineCasinos.co.uk — so when you see a slot bonus that takes your fancy, we recommend you distinguish a trustworthy casino from one that is not by taking note of these factors:
Licensing: safe casinos operate under a valid licence.
Fair gaming: trustworthy online casinos don’t operate with a house advantage.
Encryption technology: lookout for a padlock on the https:// web address.
Gaming and financial history: check for fair and transparent gambling history.
Playing at the top online casinos should always be a safe experience, especially when using slot bonuses. With that said, players have to do their due diligence when planning to sign-up and ensure their spins are valid.
Types of slot bonuses
Online casino operators want new gamblers to sign-up and play their slot games — and the most popular way to do this is by offering a variety of intriguing bonuses.
Be it free spins or a deposit bonus, these bonuses come in all shapes and sizes. Some are particularly generous; others aren’t worth your time and effort. This means you ought to know what to look out for when choosing your ultimate casino bonus.
Here is a quick guide to the most popular slot bonus types:
Welcome bonus: a slots welcome bonus offers new players a reward for joining the casino and tends to be one of your bigger offers.
Free spins: a reward designed specifically with slots in mind that provides a taster to the player by giving them bonus spins or extra spins.
Deposit match bonus: a casino will contribute bonus funds on top of your deposit, the amount of which varies depends on the casinos’ discretion.
No deposit bonus: a rare wagering bonus that triggers simply by registering an account without requiring a first deposit, but you’ll be lucky to find these nowadays.
Reload bonus: an offer for existing players once they have made their first deposit, where casinos provide a bonus on the 2nd, 3rd, 4th, and even fifth deposit.
Cashback bonus: a partial refund based on how much you play and your usual deposit amount, these are rare but offer great value if you can find one.
Always understand how bonus funds count towards wagering by reading the terms and conditions for your specific casino. Bonuses vary both in terms of wagering requirements and the slot games you’re allowed to play — so be sure to do your research before jumping into a bonus that sounds appealing, you likely won’t be given an option to cancel.
How first deposit bonuses work
First deposit bonuses, alongside free spins, are likely the most popular (and common) casino bonuses for slot games — but what are they and how do they work?
Separate to cash funds, the first deposit bonus offers players money credited as bonus funds to their 1st deposit. The amount you receive varies depending on the casino in question, plus there will almost always be restrictions dictating when and how much of the bonus can be withdrawn.
Once you sign up to an online casino and make your 1st deposit, you might be required to opt into the first deposit bonus because it’s not always awarded automatically. There might also be stipulations in the terms and conditions that require you to make a max bet or minimum deposit to qualify you for these wagering contributions.
Online casinos usually place an expiration date on your deposit bonus, meaning if you haven’t met the wagering requirements within a certain timeframe (normally 30 days), the bonus amount will be reclaimed from your account.
The bonus amount tends to be a percentage of your deposit. For example, some casinos match your first deposit bonus up to 100%, but others might double this to 200% or half it to 50%. After all, it depends on your chosen casino, which is why it’s important to find the most trustworthy casinos offering the best deposit bonus.
How to play online slot bonuses
Online slots are some of the most popular casino games because they’re easy to get the hang of and offer a tonne of fun — but what about the slots bonuses?
No matter if we’re talking about a deposit bonus or generous welcome bonus, redeeming your online slot bonus is as quick and easy as the games are fun.
Here is our quick guide to redeeming your rewards at the best online slots:
Choose a casino: pick from a list of great casino reviews here at OnlineCasinos.co.uk — this way you’re in for a great experience you know you can trust.
Check terms and conditions: T&Cs apply when registering and redeeming your slots bonus, so take time to understand the wagering requirements and make sure you feel comfortable with the stipulations.
Open your account: create an account with your chosen casino and don’t be alarmed if they ask for identification — this is a sign of validation as fully licensed UK casinos have to ask players for such information.
Activate your slot bonus: check if your bonus needs to be activated manually, while some rewards like free spins and a deposit bonus activate automatically, others require a promo code to activate.
Make a deposit: trigger bonuses such as deposits or match deposits by paying money into your casino account, here you have to link your casino account with a payment method that is eligible to claim the bonus (check T&Cs to confirm).
Have a spin: time to use your new bonus by taking spins on Starburst, Book of the Dead, and any other great slot game that takes your fancy (or the bonus applies to).
Casino bonuses vary and are likely to deviate from these steps, but there should be universal similarities at every casino that means you can broadly apply these tips, allowing them to guide you through the process.
3 best slot sites for bonuses
🥇 PlayOJO: great selection of games and brilliant reward scheme
Image credit: PlayOJO
OnlineCasinos.co.uk slot site rating: ⭐⭐⭐⭐⭐
Looking for a great selection of classic slot games? You can’t go wrong with PlayOJO. It boldly claims to have the “best online slots in the UK” — and with over 700 slots available, the casino goes a long way to back up these claims.
Three things you’ll like best about redeeming online slot bonuses at PlayOJO:
✅ Huge library of over 700 slot games
✅ User-friendly app
✅ Crisp and simple gameplay
We think PlayOJO is a fantastic casino and potentially offers one of the best UK slots bonuses. Check out our PlayOJO Casino review to learn all you need to know about this top casino.
🥈 Bet365: unique slots and well-rounded bonuses
Image credit: Bet365
OnlineCasinos.co.uk slot site rating: ⭐⭐⭐⭐⭐
From slot classics like Pharaohs Reach to unique themed adventures like Top Gun or the Matrix, Bet365 provides players with a diverse assortment of over 130 slot games to make the most of a few extra spins.
Three things you’ll like best about redeeming online slot bonuses at Bet365:
✅ 24/7 customer support for all your bonus queries
✅ No fees on payout methods
✅ Great for rookies and newcomers
Looking for a well-rounded casino that offers a streamlined experience for all player types? Bet365 could be the place for you. Check out our Bet 365 Casino review for all the ins and outs.
🥉 Casimba: huge potential welcome bonuses
Image credit: Casimba
OnlineCasinos.co.uk slot site rating: ⭐⭐⭐⭐⭐
Known for its potentially generous welcome bonus, Casimba could provide the ultimate complimentary package to match new UK players with its extensive library of over 400 slot games. Slots are the heart and soul of Casimba, which makes it one of the best casinos to play your favourite slot games, full stop.
Three things you’ll like best about redeeming online slot bonuses at Casimba:
✅ Good range of software providers and lots of games
✅ Super user-friendly dashboard for a streamlined gaming experience
✅ Potential for a generous welcome package and bonus spins
Does Casimba offer the slot experience you’ve been looking for? Find out more about this stellar, slot focused casino in our full Casimba casino review.
