Slots Welcome Bonus | Best Slot Bonuses for April

At Casinos.com, we're dedicated to finding you the best slot sites in the UK, complete with top slot welcome offers. When we say "best," we mean fully licensed, reputable sites that offer great value and a fun, secure place to play.

Each pick is carefully reviewed by our team, with a focus on fair terms, strong slot game selection, and great promotions. If you're looking for quality slot bonuses from trustworthy casinos, here are our Editor’s Picks for the best slot bonuses in the UK right now.

Best Overall Slot Bonus: Crystal Slots

When looking for the best slot bonus deals, Crystal Slots catches your eye with its playful vibe and laid-back gameplay. But what really earned it the top spot is its exciting slot welcome bonus offer.

• What you get: spin the Mega Reel when you sign up and deposit £10 (or more) for a chance to get up to 500 free spins.
• Wagering requirements: 65x
• Good to know: on your initial deposit, the Mega Reel could reward you free spins on popular slots or Amazon vouchers. Plus, for every deposit of £20+, you'll get another spin of the Mega Reel.
• Editor's verdict: Crystal Slots makes a strong first impression with its fun Mega Reel feature, and I really like that you get another spin with every £20+ deposit.

Best Free Spins Bonus: NetBet

NetBet has a solid slots welcome bonus, but it gets a second spot because free spins are distributed randomly over several days. So, while you might get 75 free spins one day, other days, you could get nothing.

• What you get: you’ll receive a free spins no deposit slot bonus when you use the code SBXXXTREME2. Then, when you deposit £10 or more and enter NBWELCOME500, you can win up to 500 free spins across several days.
• Wagering requirements: 40x
• Good to know: you’ll get a portion of your free spins after your first qualifying deposit, with the rest delivered in smaller batches over six days. Skrill, Neteller, and prepaid cards are excluded from this slots welcome bonus in the UK.
• Editor's verdict: this is a generous stack of free spins to get you started playing online slots, and the low minimum deposit is a plus. But the daily spin distribution is random - so it can be a bit hit or miss.

Best Cashback Bonus: No Bonus Casino

Don’t be fooled by the name - No Bonus Casino actually offers one of the best cashback deals out there. It’s wager-free, works across all games, and lasts for good - making it a strong choice for the third spot.

• Features: 10% cashback bonus on your deposits when you lose your full balance in a single day - no wagering, and it’s for life.
• Wagering requirements: none
• Need to know: cashback is available for up to ten days after your deposit. To claim it, your account balance must be below £10. Skrill and Neteller deposits may not qualify, so double-check the bonus terms.
• Editor's verdict: this is a superb offer. It softens the blow of losses, and because it’s wager-free, it’s super easy to benefit from. I also love that it works with the best payout online slots, which are often excluded from typical promos. A simple, fair bonus that stands out from the crowd.

More Great Slot Bonuses and Promotions at UK Online Casinos

Slots are the most played games at casino sites, so it's no surprise that operators are constantly throwing out slot bonuses to catch your eye. Whether it’s a 100% match on your first deposit or free spins for loyal players, slot bonuses can give you more chances to win without blowing your budget.

But not all bonuses are equal, and that’s where we come in. The market’s always shifting, and instead of you testing hundreds of casinos, we do the diffing for you.

How We Find the Best Slot Bonuses (So You Don’t Have To)

The key to finding a great slot bonus is reading between the lines, and we always start with the small print. We spend most of our time combing through bonus terms and conditions to figure out what’s worth claiming.

Here are some of the criteria we use to find the best slot bonuses for you:

• Wagering requirements - Some offers look amazing until you realise you need to wager 50x your bonus and deposit before cashing out. We keep an eye out for lower requirements and flag anything that feels too high.
• Slot contributions - Some slots don’t count fully toward wagering, and a few might not count at all. We check the fine print to flag any popular games that are excluded.
• Min deposit vs. bonus value – If you need to deposit a fortune to get a fairly regular bonus, it's not a great deal. We aim for a good balance.
• Ease of claiming – Some casinos make you work for bonuses - hidden codes, complex steps, or confusing rules. We test and highlight the ones that just work.

Types of Slot Bonuses in the UK

Online casinos are ever-changing, and slots bonus offers evolve, too. Any two deals are rarely the same, but plenty have a similar theme. Below, we highlight the most common types of online casino bonus deals you can access at online casino sites.

Deposit Bonus

A deposit bonus, or a matched deposit bonus, is very common. In this type of bonus, the casino site will match your deposit up to a certain amount, e.g., you get a 100% bonus up to £100.

The value of offers like this varies depending on whether you’re a new or returning customer. The bigger offers are usually reserved for attracting newbies. However, existing players can also claim offers like reload bonuses.

Free Spins

Free spins are a nice taste of the casino’s slots section, allowing you to get to know the casino and perhaps win cash, too. You can get these offers on their own or with another offer, like a matched deposit bonus.

The number of casino free spins you get will vary, but the winnings will usually need to be wagered before you can withdraw real money. This means betting the value of the bonus one or more times. These bonuses could also be called bonus, extra, and super spins.

The following free spins offers may interest you: 

Slots Welcome Bonus

These bonuses welcome new players to the casino. The welcome bonus is the most common type of bonus that you can get, as it’s part of a casino’s strategy to get you to sign up.

No Wagering Bonus

They're hard to find, but you can get a no wagering bonus for slots. For example, when you join a casino, you might get a deposit bonus of extra spins or even cash after your first deposit. 

Then you get to use that bonus to hopefully win more money. With this bonus type, if you win more cash, you can withdraw it without playing through it a certain amount. 

Want to know how much you’d usually have to wager?

Use our wagering calculator to check how much you’d usually have to play through with a standard bonus. Pick any bonus from this page and drop the details into our calculator. It’ll show you how much playthrough you’d normally need, and you’ll see why no wagering bonuses are such a win.

New Slot Promo Offers

Some casinos promote special offers when new slot games are released. It gives players the chance to play real money slots for free. The offers include prizes like extra spins, tech gadgets, luxury gifts and entries to slot tournaments.

Reload Bonus

These offers are available to existing players who have made their initial deposit and claimed the welcome offer. Casinos often release reload bonuses on a player's second, third, fourth and even fifth deposit.

Cashback

A cashback bonus offer is when a casino site refunds a percentage of your lost bets or deposits from a certain day, weekend, week, or month. You might need to hunt for these, but they can be found, especially at newer casinos that work harder to keep you.

Loyalty & VIP Bonuses

Many online slot sites have loyalty programmes with lucrative prizes up for grabs, like holidays and cars. A good loyalty programme will allow you to earn loyalty points whenever you bet. The more games you play, the more points you earn.

With loyalty points, you can progress to the next member level, which can give you reduced wagering contributions on bonuses. Other benefits include a personal account manager and more cashback every week.

Bonus Buy Slots

Who doesn't love slots bonus rounds? Bonus buys slots allow you to trigger bonus rounds in certain slot games. Unfortunately, you can't do this in the UK anymore after the UK Gambling Commission banned this feature in 2019. We introduce you to alternatives you can play and enjoy in the UK.

No Deposit Bonus

No deposit bonus deals are harder to come by these days, but they’re still around if you know where to look. With this type of offer, you’ll get bonus cash or free spins - no deposit needed. 

For slots, we’ve seen deals with 25 free spins or more, which is a great way to try out a new site without spending anything upfront. You’ll usually need to wager any winnings before you can cash out, so remember to check the terms.

How to Sign Up for the Best Slots Bonuses in the UK

Signing up and claiming slot bonuses at UK casinos is quick and easy. The only step that might take a little longer is verification - but it’s worth it. You’ll only need to do it once, and it’ll save time later when you want to withdraw your winnings.

Now, here’s how to claim your bonus, step by step:

1. Choose a casino. Select from our list above and see which one offers the best slot bonus UK players can claim. Note that free spins bonuses let you play a few free online slots and find a game you love.
2. Open an account. You'll first need to create an account with that casino site to play online bonus slots.
3. Check the terms and conditions. Although most bonuses come with similar terms, check them before depositing anyway.
4. Activate an online slots bonus. Some bonuses, such as no deposit bonuses or free spins, can be activated simply by opening a new account. Some require a promo code. If you’re unsure, contact customer support for help.
5. Make a deposit. Most of the biggest bonuses require money to be paid into your account before your bonus can be used. Minimum deposits are usually at least £10 but often £20. Remember, many e-wallets are excluded from claiming bonuses, but you can still find PayPal casinos online to give you a bonus.
6. Start spinning! Once you have your bonus, start using it to play slots! If you win using bonus spins or credit and have fulfilled the wagering requirements, you can withdraw your funds or keep betting.

Deposit Bonus Slots - the Games You’ll Usually See

Many online slots appear frequently in deposit bonus promotions - but some are more common than others. Here's why these games are picked and regularly featured in bonus offers at top UK slots sites:

• They're well-known and widely played - helps attract new players.
• They have a balanced RTP (usually 95%- 96%) and volatility - gives players a fair chance of winning, while casinos keep their risks minimised.
• They come from trusted game developers - casinos know they’re reliable.
• They’re available across most platforms - almost every site offers them.
• They’re mobile-friendly - work well on phones, tablets, and in real money casino apps.
• They don’t include progressive jackpots - helps casinos avoid the risk of massive bonus-funded payouts.
• They’re newly released - new online slots create excitement and help casinos test how popular a fresh title might be.

UK's Top 10 Deposit Bonus Slots

These are ten of the most popular slots you’ll often see in UK deposit bonus offers. They range from Egyptian and fishing-themed slots with reel modifiers to classic fruit slots - all fun picks that regularly feature in bonus deals.

How We Rate the Best Slots Bonuses in the UK

Here at Casinos.com, we don’t just post a generic review. We go deeper and are more genuine to bring you only the best slots bonuses around.

Our Team of Experts

To do this, we’ve created a dedicated team for each aspect of online casino. This team is set up to find every great online slots bonus and explain how each works and compares to the rest.

Our team includes professional casino players, game developers and casino writers. The team can cover reviews in greater detail than a one-man band.

With each review, there are guidelines our team follows. With new slot sites popping up all the time, we try to test all the best new online casinos when they hit the market.

Assessing Bonuses

The first port of call is the bonus and money on offer. ‘The bigger, the better’ is a common misconception, as wagering requirements play a part.

Working through wagering can be challenging, so we explain the bonus terms as clearly as possible.

Wagering contributions include the amount needed to clear the bonus for withdrawal. They also cover the time limit on the bonus, the games included, and the maximum bet allowed with bonus money.

Evaluating What Each Casino Has to Offer

Once we review the bonus, we move on to the wider casino and the number and quality of slot games. This includes the number of mobile slots online that are accessible. We know players love playing slots on the go.

Casinos like to use the same game providers and have many of the same slots, so we give extra points for an original range of great slots. We also love it when a casino offers progressive jackpot slots and a healthy selection of Megaways slots.

Banking and customer support options are also key to our reviewers. These can make or break your experience. The website might have the best games and bonuses in the world, but it's pointless if you can’t get money in and out.

We test bonuses and casinos every day, so check this page later in case we find even better slot bonuses.

Slot Bonus Terms and Conditions You Need to Know

Slot bonuses usually come with a few conditions. These are the most common ones to watch out for if you want to make the most of your slot offers.

• Wagering Requirements - Wagering requirements are a normal part of most online slot bonuses. They’re there to make sure the bonus is used for play before you can withdraw any winnings. For example, a £100 bonus with a 30x wagering requirement means you’d need to wager £3,000 (30 × £100) before cashing out.
• Bonus Funds Are Locked Until Wagered - You can’t withdraw bonus money right away - it only becomes real cash once the full wagering requirement is met.
• Slots Count 100%, But Not All - Most casino video slots contribute fully toward wagering, but some popular titles might be excluded.
• Some Payments Are Excluded - Not all casino payment methods qualify for claiming bonuses. You’ll often need to use the same method for withdrawals as well.
• Bonuses Can Expire Quickly - Slot bonuses typically have a short time limit, often just a few days—make sure to use them before they disappear.
• Deposit Limits Vary by Payment Method - Debit cards and bank transfers usually allow higher deposits. E-wallets and prepaid cards tend to have lower limits.
• Promo Codes Might Be Required - Some offers need a casino promo code, which must be entered before your first deposit. If you forget, you often can’t apply it later.