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A 400 percent bonus is one of the most valuable offers you can find on UK casino sites. With this bonus, you are practically quintupling your initial bankroll, thus getting plenty of chances to try out new games and experiment with various strategies.
Review our top list to find the best 2025 British online casinos with a 400% deposit bonus and get a better understanding of how this promotion works, how to claim it, which terms to pay attention to, and more.
Our dedicated editorial team evaluates every online casino prior to assigning a rating. These evaluations are grounded in a rigorous scoring methodology that encompasses factors such as trustworthiness, overall gambling experience, fee structures, customer support quality, and various other critical aspects.
Bonus type: Deposit Bonus
Min Deposit: £5
Wagering: 40x GB, 0x FS
Bonus type: Deposit Bonus
Min Deposit: £10
Wagering: 50x
Bonus type: Deposit Bonus
Min Deposit: £10
Wagering: No Wager
Bonus type: Deposit Bonus
Min Deposit: £10
Wagering: 40x
Bonus type: Deposit Bonus
Min Deposit: £5
Wagering: No Wager
Bonus type: Deposit Bonus
Min Deposit: £10
Wagering: 4x BB, 0x FS
Bonus type: Deposit Bonus
Min Deposit: £10
Wagering: 40x GB, 0x FS
Bonus type: Deposit Bonus
Min Deposit: £10
Wagering: 65x
Bonus type: Deposit Bonus
Min Deposit: £5
Wagering: 40x
Bonus type: Deposit Bonus
Min Deposit: £5
Wagering: -
Bonus type: Deposit Bonus
Min Deposit: £10
Wagering: 5x GB; 20x FS
A 400% bonus is an online casino bonus offered to new players as a welcome gift. The percentage indicates the amount of money you’ll receive relative to your initial deposit. So, for example, if you deposit £50, you will get £200 in bonus funds and have a total of £250 to play with. Since they’re designed for new customers, these bonuses are usually one-time deals.
Every bonus comes with limits, so you should take note of the minimum deposit and maximum bonus amounts indicated in the bonus terms. You will receive your bonus shortly after the initial payment goes through. Sometimes, you may have to use a specific bonus or promo code to unlock the offer.
Also, some 400% bonuses can be spread across multiple deposits. For instance, a first deposit bonus of 200% may be followed up by a 100% second deposit bonus and a 100% third deposit bonus for a total of 400%.
Getting a 4x casino bonus on your first deposit is quite rare, as you will find that most UK casino sites offer 50% to 100% bonuses instead. Nevertheless, we did manage to find a few legit online casinos that award this generous promotion, and if you’re lucky, you may even stumble upon some 500% casino bonuses as well.
A 400 percent bonus is always a deal worth taking, but it does have a few downsides you should consider. Here’s a list of pros and cons to help you better evaluate this bonus:
Not every 400% bonus is the same. Similarly, casinos offering this type of promotion can differ from one another as well. This is why we had to set criteria by which we could properly evaluate and rank these websites. Here’s what we looked into before finalising our top list:
Now that you know how we evaluate GB casinos with 400% deposit bonus offers, let’s explore the different types of these tempting bonus offers and learn the key differences between them.
Percentage-based bonuses can take many shapes and forms. They can be categorised based on who they’re offered to (new players or regulars), what they contain (cash bonus only or some free spins on top), the deposit amount needed to unlock them, and more.
Below are some of the most common types of 400% bonuses available in the UK.
These offers provide excellent value for new players, enabling them to explore the website with a heavily boosted bankroll. The popular UK casinos mentioned below offer these promotions, sometimes including specialised slots bonus perks like free spins.
Five pounds is the smallest amount of money you can deposit to trigger a 400% bonus. Although some casinos accept even lower deposits, £5 is usually the lowest threshold for unlocking this type of promotion. You have the option to deposit £5 and play with £25 at Heart Bingo, Parimatch, and Betfred, among other great UK casinos.
Ten pounds is the most common minimum deposit amount for unlocking first deposit bonuses. When you lay down £10 to trigger a 400% sign up bonus, you will receive £40 in bonus money and have a total of £50 to play with. To deposit £10 and play with £50, you should visit UK casinos such as Unibet, Foxy Bingo, and Foxy Games, some of which will also give you free spins.
A minimum deposit of £15 is not that common of a threshold, but some casinos have this requirement. This effectively means that your £15 deposit will come with a £60 bonus for a total of £75.
While few casinos require a £20 minimum deposit to unlock a bonus, you are free to deposit £20 and play with £100. As a matter of fact, the more you deposit, the bigger your bonus will be, but keep in mind that 400% bonuses frequently come with strict maximum bonus limits.
A reload bonus differs from a welcome bonus in that it’s intended for returning players who have already used their welcome bonus funds. Another difference is that you can use casino reload offers multiple times, while a sign-up bonus is a single-use deal only.
A hybrid bonus encompasses two or more types of bonuses in a single promotion. Many of the casinos on our list feature these exact offers, like Kitty Bingo, which gives new players a 400% first deposit match for up to £40 and 50 free spins on a featured video slot.
High-roller casino promotions are designed for big spenders and those willing to place large initial deposits. You won’t find many British casinos that offer a specific 400% bonus for high-rollers, but you may find even bigger percentage matches, like a 1000% welcome package up to £6,000 that’s available at both 777 Cherry and All Star Games casinos.
A 400% bonus may pop up during holidays and special dates. UK casino sites often roll up time-limited promotions during Christmas, Halloween, Valentine’s Day, and Easter, while some may award you a personalised birthday bonus.
Many of the bonuses described above are available at our recommended online casinos. So, let’s see where you can grab those elusive 400% bonus deals, shall we?
When we set out to find the best 400% casino bonuses, we knew we were undertaking a difficult task. Still, among dozens of British casinos offering 50%, 100%, and 200% first deposit deals, we did spot a few operators willing to go beyond the norm and reward new customers with a 400% welcome bonus. Check out the details of these bonuses in the table below.
| Online Casino | Welcome Bonus | Promo Code | Min. Deposit | Minimum Deposit Bonus (£) | Game Type | Deposit for Max Bonus | Wager Req. |
|---|---|---|---|---|---|---|---|
| Unibet | 400% up to £40 | Not required | £10 | £40 | Slots | £10 | 50x GB |
| Kitty Bingo | 400% up to £40 + 50 FS | KITTY40 | £10 | £45 | Bingo & Slots | £10 | 5x GB; 20x FS |
| Heart Bingo | 400% up to £20 | Not required | £5 | £20 | Bingo | £5 | 0x |
| Parimatch | 400% up to £20 + 10 FS | Not required | £5 | £21 | Slots | £5 | 40x GB, 0x FS |
| Foxy Bingo | 400% up to £20 + 40 FS | Not required | £10 | £24 | Bingo & Slots | £10 | 4x BB, 0x FS |
Keep in mind that these casinos may switch up their bonuses, while new 400% offers may appear from time to time. To stay updated with these changes, keep returning to this page and subscribe to the chosen casinos’ email updates.
Online casinos make registering and using their bonus easy. But in case you’re new to this process, we’ve created a simple step-by-step guide to help you unlock your 400% offer in minutes.
Choose a casino Pick one of the recommended casinos from our list and click the Claim Bonus button.
Register Once you land on the casino’s website, find a Sign-Up button and create your account. You’ll need to share your name, birthday, email address, physical address, mobile phone number, and a few other personal details. If required, type in a promo code.
Verify your account Follow the instructions on how to verify your account. This is usually done via a confirmation email or SMS code.
Deposit Head over to the cashier page, select a payment method, and complete a deposit while paying attention to the deposit limits associated with the 400% bonus.
Claim your bonus The bonus should appear in your account shortly after the deposit goes through. Start playing eligible games and completing the wagering requirements. Good luck!
Before claiming your 400% deposit bonus, it’s essential to understand all the rules that come with it to make the most of your rewards.
Like any other casino promotion, the 400% bonus comes with terms and conditions that limit its use and be sure no one abuses it. The complete list of terms is usually long and contains a lot of technical information that you shouldn’t really concern yourself with, which is why in this part, we will focus on only the most important ones, including:
Once familiar with the terms and conditions, the next step is to explore the payment methods available to claim and use this 400% bonus easily.
The deposit required to unlock your 400% bonus can be made using many different payment methods, including cards, ewallets, bank transfers, and mobile payment services. However, before using any of these, check the deposit limits associated with a given method, the potential fees, and whether it can be used to unlock the bonus.
Debit Cards (Visa/Mastercard)
The Visa debit card remains one of the most popular payment options at British casinos in 2025. It’s trusted, secure, easy to use, and provides instant deposits, and casinos with Visa are generally easy to find. Likewise, Mastercard debit cards are widely accepted at UK online casinos, offering the same levels of security, efficiency, and ease of use. Casinos with Mastercard deposits are as common as those accepting Visa.
PayPal
PayPal is popular for its speed and convenience, allowing players to deposit and withdraw without sharing bank details. It is known for its excellent security features and widespread acceptance at UK casinos.
Apple Pay
Apple Pay provides a quick and secure way to deposit funds using biometric authentication on your iOS device. There are increasingly more casino sites with Apple Pay as people realise the convenience of this deposit method. However, it typically only supports deposits, so players must find another withdrawal method.
Google Pay
Google Pay is a fast and secure payment option that allows players to deposit funds directly from their linked cards or bank accounts. Its seamless integration with Android devices makes it a popular choice for mobile casino players. If this is your preferred payment method, consider checking out our list of Google Pay casinos.
Paysafecard
A prepaid voucher system, Paysafecard is ideal for those who value anonymity and budgeting. While deposits are instant, withdrawals typically aren’t supported, requiring players to choose an alternative for cashing out.
Pay-by-Phone
Pay-by-phone methods like Payforit allow you to make instant deposits and pay for them later with your next phone bill. While they’re very convenient, especially for mobile casino players, pay-by-phone methods work for deposits only and have very low max deposit limits.
Skrill and Neteller
Skrill and Neteller are two of the most widely used e-wallets, known for their privacy, ease of use, low transaction fees, and flexible transaction limits. The biggest flaw of these two e-wallets, however, is that you often can’t use them to unlock a casino’s welcome bonus.
Bank Transfers
Bank transfers are a secure and transparent option, though they are usually much slower than other methods. Ideal for large transactions, they are supported by nearly all UK casino sites.
There is a broad variety of games that you can explore with your 400% first deposit offer. From spinning the reels of hundreds of video slots to testing your luck and skills in traditional table games like roulette and blackjack, there are many different ways in which you can start meeting those pesky wagering requirements.
Video Slots
Covering a broad range of themes, payout mechanisms, and appealing bonus rounds, video slots are not only fun but potentially very rewarding. Their fast pace is also ideal for completing wagering requirements quickly, while video slots in most casinos have a 100% wagering contribution.
Table Games
Table games like roulette, blackjack, poker, and baccarat will always be considered classics, which is why you’ll find them at virtually every UK casino site. However, keep in mind that some of these games may have lower wagering contributions, so they might not be ideal for playing with a bonus.
Live Dealer Games
Live casino games emulate the excitement of a real brick-and-mortar casino. With professional dealers, excellent picture quality, and real-time interactions, live options offer a realistic gameplay perfect for those seeking authenticity.
Bingo
Bingo fans can use their 400% deposit bonus to buy more tickets, increasing their chances of winning. If you prefer classic 90-ball bingo or faster-paced 75-ball variations, the bonus allows you to explore different rooms and prize pools.
Crash Games
Offering simplicity mixed with adrenaline-fueled elation, crash games like Aviator are the latest hit in the online casino industry. Players can use their bonus to predict when the multiplier will crash, aiming to cash out at just the right moment.
With so many varying games to choose from, your 400% deposit bonus can provide hours of entertainment and endless opportunities to win. But before you can fully enjoy your winnings, it’s essential to understand the process of withdrawing your bonus funds.
The ultimate goal of using a 400% deposit offer is to gain something from it. While you need a lot of patience and luck to win, turning your bonus into withdrawable cash is possible, and you should know what to do in case this happens:
If you need any ideas on how to use your bonus funds, here are a few top-rated video slots you can try out. These fast-paced games have relatively generous RTPs and are ideal for quickly completing those tedious wagering requirements.
| Slot Game | Developer | RTP (%) | Volatility | Paylines | Min Bet (£) | Max Bet (£) | Free Spins | Multipliers | Wilds | Jackpot | Max Win (x) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Starburst | NetEnt | 96.09 | Low | 10 | 0.10 | 100 | No | No | Yes | No | 500 |
| Book of Dead | Play’n GO | 96.21 | High | 10 | 0.10 | 100 | Yes | Yes | Yes | No | 5000 |
| Big Bass Bonanza | Pragmatic Play | 96.71 | High | 10 | 0.10 | 250 | Yes | Yes | Yes | No | 2,1 |
| Gonzo’s Quest | NetEnt | 95.97 | Medium | 20 | 0.20 | 50 | Yes | Yes | Yes | No | 3,75 |
| Rainbow Riches | Barcrest | 95.00 | Medium | 20 | 0.20 | 400 | No | Yes | Yes | No | 500 |
| Eye of Horus | Blueprint Gaming | 96.31 | Medium | 10 | 0.10 | 100 | Yes | No | Yes | No | 10000 |
| Fishin’ Frenzy | Reel Time Gaming | 96.12 | Medium | 10 | 0.10 | 20 | Yes | No | Yes | No | 5000 |
| Gates of Olympus | Pragmatic Play | 96.50 | High | Cluster Pays | 0.20 | 125 | Yes | Yes | No | No | 5000 |
| Immortal Romance | Microgaming | 96.86 | Medium | 243 | 0.30 | 60 | Yes | Yes | Yes | No | 12000 |
| Cleopatra | IGT | 95.02 | Medium | 20 | 0.20 | 100 | Yes | Yes | Yes | No | 10000 |
You don’t need to focus solely on the 400% offers, as many other percentage-based promotions are worth taking advantage of. Below is a simple comparison table that will let you quickly calculate the amount of bonus funds you stand to receive once you complete a small deposit.
| Bonus | Bonus Calculation for £10 Deposit | Total Amount to Play With (£) |
|---|---|---|
| 400% Casino Bonus | £40 for £10 | £50 |
| 50% Casino Bonus | £5 for £10 | £15 |
| 100% Casino Bonus | £10 for £10 | £20 |
| 200% Casino Bonus | £20 for £10 | £30 |
| 300% Casino Bonus | £30 for £10 | £40 |
| 500% Casino Bonus | £50 for £10 | £60 |
| 600% Casino Bonus | £60 for £10 | £70 |
| 1000% Casino Bonus | £100 for £10 | £110 |
You must make the minimum deposit indicated in the bonus terms and conditions to trigger the bonus. Some casinos may allow you to deposit smaller amounts, but then you won’t be able to claim the offer. Making a subsequent deposit won’t work either, as these offers are usually for first deposits only.
400 percent bonuses are rare as it is, let alone ones that don’t have any wagering requirements. While such an offer is technically possible, you’d be hard-pressed to find a casino generous enough to offer it. In most cases, you will face wagering requirements between 20x and 50x.
Most casinos will put a time limit on your bonus. Once you complete a deposit and claim the promo, you will have a few days, weeks, or months to use it and satisfy the associated wagering requirements, with the exact time varying between bonuses and casinos. Also, the offer itself may be valid only until a specific date.
