Slots Welcome Bonus | Best Slot Bonuses for March

Here at Casinos.com, I'm dedicated to finding you the best slot sites in the UK, complete with top slot welcome offers. By 'the best,' I mean fully licensed, reputable sites you can trust. So if you're after great value and a fun place to play, here are my top picks for the best slots bonuses in the UK right now.

Best Overall Slot Bonus: Crystal Slots

When looking for the best slot bonus deals, Crystal Slots caught my 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.
• My take: 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 I placed it second 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.
• My take: 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 my 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.
• My take: 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

Navigate Your Way

Slots are the most played games at casino sites, so it's no surprise many operators try to attract you with an online casino bonus on slots.

There's one obvious reason why slots are so popular. If you're lucky, you can win big jackpots from modest stakes. For instance, a UK player won £16 million from £0.25! This kind of jackpot size and win is rare — there's a one in 34 million chance of winning a £16 million slot jackpot. 

Another big attraction to casino video slots is bonuses. You can get a 100% match bonus to sign up at a casino, and existing players can also grab a slots deposit bonus.

We aim to bring you all the top slots bonuses on brand new online slots in the UK. The market is constantly changing, so instead of testing hundreds of casinos yourself, we do that for you.

Finding the Deals: Online Slots Bonus Offers

When seeking the best offers, most of our time is spent within the bonus T&Cs. Only once we’ve studied these can we assess if a bonus is worth promoting.

We want to make sure you get the right slots bonuses for the games you want to play. But we won’t push a site based on reputation alone.

Some casinos make you work harder than others to unlock your bonus, and we’ll let you know which offers the best value for the time and effort required.

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

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.

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 a range of bonuses you can access at several online casinos.

UK Slots Sign Up 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.

Free Spins Bonuses

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 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.

No Deposit Bonus

These are as rare as hens’ teeth, but if you’re lucky, you can still grab the odd no deposit bonus for slots. This is a bonus that the casino will give you when you register an account, with no deposit needed to trigger it.

A bonus that requires no deposit could be free spins or a free bet on a sports betting site. Then, you’ll have to wager whatever you win with the bonus. No deposit bonuses are on the rarer side these days, but for slots, we have seen 25 free spins no deposit casino bonuses. 

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 Bonuses

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

Cashback

A cashback 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 Bonuses

Many online casino 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.

Mobile Slot Bonuses

Mobile casinos in the UK are now just as successful and accessible as desktop casinos, so offers exclusive to mobile are becoming rare.

That being said, it’s worth noting most casinos allow you to clear a bonus by betting on mobile via your browser or their app, on Android or iOS. The only issue is that not all desktop games are available on mobile just yet.

Many sites have produced casino apps where you can play for real money, so they are worth downloading if you want to play away from home.

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.

What is a No Wagering Slots Welcome Bonus?

They're hard to find, but you can get no wagering slots welcome bonuses. 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. 

MagicRed is a good example. The slots welcome bonus here has no wagering requirements. Get that offer below.

Deposit Bonus Slots

Many online slot games frequently appear in deposit bonus promotions. These games often share common features that make them attractive for both casinos and players:

• They are well-known and widely played, so they attract new bettors.
• They typically have an average RTP of around 96%, with some being highly volatile. This means players have a fair chance of winning, while casinos minimise risk.

Progressive jackpot slots on the other hand, are often excluded from deposit bonuses. This is to prevent massive payouts from bonus funds.

When it comes to casino welcome offers and promos for existing players, we often see certain types of slot games included:

• Egyptian-themed slots with expanding symbols
• Fishing-themed slots with reel modifiers
• Classic fruit slot machines with simple mechanics

As you can see from the list below, most have an RTP of 96% or higher, which means, in the long run, for every £100 bet, you'll get £96 back. Of course, you can win more than 96% or lose more than 4%. 

Your maximum win potential also depends on any bonus limits. It's important to remember that free spins and other deposit bonuses are simply that, though - bonuses - so it's best to treat them as a nice added extra.

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.

Terms and Conditions: What are Wagering Requirements for Slots Bonuses?

Wagering requirements prevent players from claiming bonus money and cashing it out immediately. A typical offer may have a 30x wagering requirement on the bonus amount. This means that if you receive a £100 bonus, you must place £3,000 in total bets (30 × £100) before you can convert the bonus into withdrawable cash.

Until you meet these wagering requirements, you can't cash out the bonus money - it's locked. But once you've wagered the full required amount, any remaining bonus funds or winnings become real cash you can withdraw.

Exclusions

Bear in mind that some games don't contribute towards wagering. Usually, live casino games like blackjack aren’t included, or they only count 10%. However, casino slots usually count 100% in wagering, although some may not count.

Also, you can't use some payment methods to deposit and claim bonuses. Plus, you generally have to withdraw funds using the same payment method you used to deposit them. Remember, most online slots bonus funds expire after several days.

Wagering Calculator

Here's our handy wagering calculator, which will help you calculate how much you'll need to wager.

Click the image below, and it will open in a new window. Then, type in your deposit amount. Add the bonus percentage (i.e., 100%) and how much you need to wager. Insert the game's contribution, and you'll see how much you need to bet using your bonus money.

Is There a Limit on How Much You Can Deposit at a Slot Site?

Yes, there is. While many operators provide the best casino payment methods, each has limits and withdrawal times.

Deposit limits are usually highest for debit cards and bank transfers. Meanwhile, e-wallets and prepaid cards have lower limits.

Do All Slots Bonuses Require a Promo Code?

Very few bonuses come with a casino promo code but if you find one, use that code to claim your bonus. To use it, enter the bonus code before making your first deposit or follow the casino's instructions. You won’t be able to add another one if you forget.