Best Casino Bonuses in the UK for March - Tested and Ranked

Find the perfect online casino bonus right here! I've gathered the best casino bonuses UK casino sites offer, from deposit matches to free spins and the occasional no-wagering deal. My team and I have tested the latest offers to bring you the best deposit bonuses for all types of players. Stick around for expert tips on stretching your bankroll and avoiding common pitfalls. 

Now, let’s check out the top online casino bonuses available this month!

Best Overall Casino Welcome Bonus - Grosvenor

The regular Grosvenor bonus gives you £50 to play with when you deposit £20, but with our exclusive offer, you also get 100 free spins on top! Even better, you can win up to £500 from those spins, which is seriously generous.

And it gets even better. You can cash out up to £2,000 from your bonus money. That’s huge compared to most online casino bonuses and general casino offers. Plus, here’s something you don’t see every day: you can use your bonuses on jackpot and progressive games - a rare perk at an online casino. 

Best Perks of This Offer:

• You can use the bonus on progressive games - extremely rare!
• High bonus conversion limit - Cash out up to £2,000 from your bonus funds.
• Low free spins wagering - Just 1x wagering on your free spin winnings!

🚩 What To Watch Out For: A 30x wagering fee applies to both the bonus and your deposit.

Best Player-Friendly Welcome Bonus - Mr Vegas

Mr Vegas offers the most player-friendly casino welcome bonus, giving you a 100% deposit match plus 11 wager-free spins. Unlike other casinos, you get plenty of time (60 days!) to claim and use your bonus, and you're not restricted to just slots - you can play table games and live casino, too.

Why You'll Love This Bonus: 

• No wagering on free spins - You keep what you win.
• 60-day wagering period - Much more time than most offers.
• Flexible game eligibility - Use your bonus on slots, table games, or live casino.

🚩 What To Watch Out For: Bonus is released in 10 equal parts + max bet restrictions.

Best Deposit Bonus Casino for Slots - Duelz 

The Duelz bonus is another great offer, especially if you love free spins. While you get more free spins than Mr Vegas, I ranked this bonus offer third because they aren't wager-free. That said, this deal still stands out thanks to its high winning cap - you can cash out up to £100 from free spins and up to £500 from bonus money. This is more generous than many similar UK casino welcome bonus offers.

Top Reasons to Claim This Bonus:

• Double your deposit - The 100% match gives you twice as much to play with.
• High winning limit - Cash out up to £500 using your bonus money. 
• Great free spins potential - Win up to £100 from the free spins bonus.

🚩 What To Watch Out For: 45x on free spin winnings.

The above casino welcome bonuses are my top picks for different types of players. But of course, there are plenty of other great options out there! So, if you're looking for more choices, here are plenty more desktop and mobile casinos with fantastic online casino bonuses.

Navigate Your Way

Types of Casino Welcome Offers in the UK

There are always multiple types of online casino bonuses on offer, so it pays to understand what they are. Here, I've broken down the most popular bonus types you are likely to come across.

Casino Welcome Bonus

Online casinos use welcome bonuses to help attract new players. You generally have to deposit some of your own money to unlock a casino welcome bonus, so it’s widely referred to as a matched deposit bonus. Let's take a look at how it works.

Let's say you find a 100% welcome bonus up to £200. That means if you deposited £200 of your own money, you’d receive an extra £200, giving you £400 to play with. A 200% welcome bonus up to £500 would see you given £750 to play with if you deposited £250 of your own money, and so on.

Just remember to check the wagering requirements and read the small print before deciding on the best online casino bonuses for you. For me, the following welcome bonus casino sites have some of the best casino welcome bonus offers right now.

No Wagering Casino Bonus

A no wagering casino bonus allows you to enjoy free goodies without wagering requirements. This means if you win anything after your qualifying deposit, you can withdraw your bounty straight away! This is why many players regard this type of offer as the best online casino bonus in the UK. 

Online casino bonuses like these can take many forms, including casino no wagering free spins, or cash. 

As you can imagine, these promotions are rare. But you can still find online casino bonuses with no wagering at some casino bonus sites, especially new online casinos. The idea is to make a strong first impression when you try out the site, so you’ll want to stick around.  

If you're looking for the best casino bonuses with no wagering involved, check out this site:

Live Casino Bonuses

Live casinos are well established in the UK today, with demand growing all the time. As competition is fierce, some casinos try to stand out by launching promotions for live games. 

If you sign up for a live casino bonus, you can play while interacting with the dealer and your fellow players. But even the best roulette sites may have tougher wagering rules for online casino bonuses compared to their slot promotions.

No Deposit Bonus

As the name implies, a no deposit bonus in the UK is essentially a freebie: you get a small bankroll to play with without making a deposit first. 

So what’s the catch? Actually, there are two. First, the amount you are given is usually much lower than for a deposit match bonus, which reduces your chances of winning. Second, wagering requirements on these bonuses are often pretty high, often in the ballpark of 50–60x.

Still, these online casino bonuses are a way for you to try a new site or game without risking any of your own money, so they’re not to be sniffed at.

Reload Bonus

Casino sites will often dish out reload bonuses to keep customers loyal. This is where your bankroll is given a top-up at certain times, or when earlier online casino bonuses have been used up.

Reload bonuses are generally smaller than a casino welcome bonus, but they give you an added incentive to keep playing, plus extra chances to win.

Free Spins or Extra Spins

Using free spins in UK casinos gives you a package of extra spins on an online slot. Usually, these are restricted to particular games, but some offers apply to a whole range of slot titles.

Extra spins can come in the form of a standalone bonus, or they could be part of a bigger slots welcome bonus in the UK. Extra spins could come with a deposit match bonus, for example.

Once you've used your free spins, any bonus money you win will be added to your account balance. At the best slot sites in the UK, sometimes the bonus wins will automatically be withdrawable as cash. But this amount is subject to wagering requirements before you can actually make a cash withdrawal.

Loyalty Promotions

Many online casinos have systems in place to reward loyal customers. Generally, this involves giving you points as you play, with more points awarded for higher wagers. 

You can then exchange these points for various online casino bonuses like free bets, free spins, or other rewards. This is another tool designed to keep customers loyal, and it’s worth scrutinising, as it can help you make money when playing.

For example, you might receive one point for every £1 you bet on online poker or table games and five points for every £1 you bet on real money slots in UK casinos. Then, these points can be exchanged for bonus money or even special prizes like a far-flung holiday. A really generous loyalty programme can make the difference between earning a profit or incurring a loss over the course of the year.

Birthday Bonuses

It's always nice to get special online casino bonuses on your birthday. Many online casinos like to get in on your celebrations, no matter how big or small your plans are. Sites will sometimes offer you a bung in the form of a casino birthday bonus -  usually a few free spins on a particular slot. 

Sometimes, you’ll even get a one-day deposit match or other online casino bonuses just for celebrating your birthday. Unlike some other deals you won't need to search of this offer yourself. Once you're all signed up and verified, the casino will have your birthday on record. When your b-day rolls around, they'll get in touch either in your account area or by email and SMS to inform you of your gift.

VIP Bonuses

If you place a high volume of bets or you are classed as a high roller, you could qualify for VIP online casino bonuses. Such benefits in VIP online casinos may include:

• Cashback on bets
• Quicker withdrawals
• Tailored online casino bonuses
• Lower wagering requirements
• A personal account manager
• Birthday gifts
• Tickets to concerts or sporting events
• Holidays or trips to Las Vegas
• Gadgets and luxury goods

Refer a Friend Programmes

Many casinos will reward you for encouraging friends and family to sign up for an account. The bonus you receive will generally be tied to the amount your friend deposits. Of course, this bonus will also have terms and conditions, including wagering requirements, and a limit to how many times it can be used.

New Casino Bonuses for Specific Games

Sometimes operators tie their online casino bonuses to certain games. Slots from Pragmatic Play and NetEnt are common games that you will find tied to the latest casino bonuses. 

You may also come across online casino bonuses linked to new slots, as the game developer, casino, or both try to encourage you to give the new game a go. 

Cashback Bonus

A cashback bonus is a reward where a percentage of your stake is returned to you as cash. It applies to specific transactions or spending categories, allowing you to save money or earn back a portion of what your spending.

Cashback bonuses are becoming more common. Our users have mentioned that they like the security of having a percentage of their money returned to them.

How to Choose the Best Casino Bonus: Tips You Need to Know

It’s easy to get bamboozled by flashy online casino bonuses and claims, but when it comes to the best casino bonuses the devil really is in the details. So before you sign up to an offer that seems too good to be true, these tips help you understand what’s in the small print.

Understand Casino Bonus Wagering Requirements

Wagering requirements are simply the number of times you have to wager online casino bonuses before you can withdraw any winnings. Some of the best casino sign up offers in the UK come with these conditions attached, however some don't.

For example, let’s say you sign up for a £100 casino deposit bonus, and it comes with a 30x wagering requirement. In this scenario you’d have to keep betting the bonus amount until £3,000 has been wagered (£100 x 30).

Other factors that affect how much you need to wager include if you need to wager the bonus amount and your deposit amount, or just the bonus. Plus, different game types contribute different percentages to wagering.

How Much Will You Need to Wager?

So how can you work out exactly what your wagering amount should be? By using our handy Wagering Calculator of course!

Click the button below and the calculator will open in a pop-up.

Find Out Which Games Are Eligible… and Which Aren’t

If you’ve ever signed up for an amazing UK casino bonus without realising it’s only playable on games you have no interest in, you'll know it's not ideal.

Simply put, most online casino bonuses are only valid for select games. This could be a single slot game, a specified group of slots, or a mixture of slots and other table games. 

Not only that, it’s often the case that certain eligible games don’t count 100% to wagering requirements. Table games or live casino games, for example, usually count around 10–20% towards wagering requirements. 

What does this mean in reality? Well, let’s take the same example given above. A £100 deposit with a 30x wagering requirement means you must wager £3,000 in total before you qualify for any winnings. If your game of choice, e.g. blackjack, has a 10% contribution, every £10 you wager only contributes £1 towards that £3,000 goal.

So, if you only wanted to play blackjack online, you’d effectively have to wager £30,000 before you could claim any winnings! It's really important to know which games online casino bonuses cover.

Check When the UK Casino Bonus Expires

Another hugely important thing to know about online casino bonuses is how long you have to use up your promo. After all, the last thing you want is to find the perfect promotion only to later find that you only had 72 hours to fulfil a £50,000 wagering requirement!

Casino bonus time limits range from hours to months, and that’s not all. While online casino bonuses are often given out straight after making your first deposit, sometimes the benefits are staggered. So, you’re given a portion of the bonus each day or week until you receive all of it. And to make it even more tricky, each instalment may have time limits or wagering requirements, so remember to check!

Find Out if Deposits, Bets, or Winnings Are Capped

Even the best casino welcome bonus can have limits on how much you can deposit. For example, a 200% deposit match with a maximum bonus amount of £100 means that £50 is the most you can expect the casino to match. You can of course deposit more, but you won’t receive any more ‘free’ money as a result. 

By the same token, each game that’s eligible for the bonus is probably going to have maximum bet sizes attached to it. For example, it could be £0.10 per spin on a qualifying slot, or £25 for a single bet on a table game.

Why do the casinos do this? To avoid you winning too much on the back of a bonus, which would quickly see them out of profit. And to this end, another common condition is to cap maximum winnings altogether. That way, even in the worst case scenario the casino site is able to limit its losses while still giving players a healthy win if the maximum is achieved.

Make Sure Your Payment Method Is Eligible

This is something that trips up a lot of players. Many casino bonus sites are very particular about which payment providers can be used to deposit money for redeeming bonuses. If you’re not aware of this, you may waste a lot of time and money playing bonus you have no chance of winning from.

Typically, super fast e-wallets are not eligible for claiming online casino bonuses. This is because they provide anonymity, allowing people to claim bonuses several times. So, you may need to use alternative online casino payment methods if you're used to an e-wallet. 

Therefore, you need to read the small print to make sure your payment method isn’t excluded from the bonus.

Don’t Forget to Activate Your Online Casino Bonuses

Finally, a tip that should be obvious but is possible to get wrong. Most online casino bonuses are automatically credited to your account after you deposit; others need to be activated. This could be in the form of a casino bonus code you have to enter at the cashiers, or by going to your profile and selecting your bonus of choice.

Of course, if you don't activate the bonus, you won’t be able to enjoy the extra spins or money you thought you were getting.

How to Claim Sign Up Bonus Offers

Signing up for the best casino bonuses is simple. Just follow these steps:

1. Use our top casinos list to identify the best and most reputable casino bonus sites in the UK, including those available on real money casino apps.
2. Sign up with your personal details, choose a password, verify your email address, and provide proof of ID.
3. Read the terms and conditions thoroughly. Look out for wagering requirements, game eligibility, and minimum deposits to gain a full picture of the bonus rules.
4. Input the relevant code, if there is one, when you make your first deposit. If you don't, you could miss out on those online casino bonuses that need a code.
5. Make a deposit using an eligible payment method. Remember it's best to avoid Skrill or Neteller for your initial deposit. You will then unlock the casino welcome bonus and the funds will be credited to your account.

Remember, you can only make a withdrawal once you've completed the wagering requirements (if there are any). Once you've claimed your first casino deposit bonus, you'll be a fully-fledged member of the casino. As a registered member, you'll received other ongoing online casino bonuses like reload bonuses.

How We Rate Online Casino Offers

With hundreds of options out there, how do we pick the best? At Casinos.com, our experts follow a thorough process to find and recommend top online casino bonuses. Here’s how we do it:

1. We test casino bonus deals. That means we take a close look at what’s on offer, whether it’s a deposit match, free spins, or anything else. And since there are a lot more to online casino bonuses than the headline numbers, we dive into the T&Cs to see what conditions are in place. We check the following: wagering requirements, eligible games, time limits, caps on deposits, bets, and winnings. We also see what payment methods are accepted and other important details.
2. We sign up and claim the online casino bonus. There’s no point in us recommending online casino bonuses that don't do what they says, or have a painful sign-up process. To make sure, we test everything just as a real customer would, and if we think that this bonus is more trouble than it’s worth, it won’t make the cut.
3. We make sure the casino bonus sites are legit. At Casinos.com we only recommend the best casino bonuses from trustworthy sites that hold a licence from the UK Gambling Commission. We also offer detailed reviews of all UK casinos listed here. They cover game variety, quality, user experience, the appeal of their sign-up bonus and more.