What if your deposit grew fourfold at a casino that offers a 400% deposit bonus? A 400% bonus can turn a €100 deposit into €500, giving you unparalleled value for your money. Our Mr. Gamble experts have vetted and ranked the top casinos offering this incredible deal to ensure you find the most reliable and rewarding options.
Up to 400% Deposit Bonus Casinos List – Updated September 2025
Explore our list of casinos offering up to 400% deposit bonuses. Use our filters to find a deal tailored to your gaming preferences and start playing with confidence.
Here are the best bonuses that match what you’re looking for.
We are always on the lookout for the best deals for you. We do not list subpar or unlicensed casinos, or aggressive bonuses at Mr. Gamble. We believe the offers below are the best you can claim today.
For the safety of players and to keep operators accountable, the team at Mr. Gamble implements a world-class evaluation process for all online casinos. The team incorporates a strict due diligence process for listing casinos on Mr. Gamble by verifying the operating regions of casinos and the validity of local licenses, among other aspects such as customer service, game selection, banking methods, and bonuses.
Our editorial policy includes fact-checking all casino information while including real-world data to provide the most relevant and helpful guide for readers around the world. At Mr. Gamble, the players' safety and satisfaction are our top priority — you can rely on us to get the best possible offers from licensed online casinos.
What Is a 400% Deposit Bonus?
A 400% deposit bonus is one of the most generous casino offers you can find, giving you four times the value of your deposit in bonus funds, up to a certain amount. While these promotions are rare, they can provide a huge boost to your bankroll right from the start.
For example, you might come across a 400% casino bonus up to €250. If you deposit the full €250, the casino will match it with an additional €1,000 in bonus funds. That gives you a total bankroll of €1,250 to kick off your play (your €250 cash deposit plus the €1,000 bonus).
Pros and Cons of 400% Deposit Bonus
A 400 deposit bonus might make you feel like the gaming gods are shining on you. However, the reality is that every bonus has its pros and cons. Here are some to take into account when it comes to claiming an online casino 400 bonus.
✔️PROS
❌ CONS
Quadruples your bankroll. Having 5x the amount you invested is a great return, and the perfect way to start life at a new casino.
Wagering requirements. Most 400 deposit bonuses come with wagering requirements, so make sure you’re okay with these before accepting the bonus.
Low minimum deposit. Many online casinos still allow you to get started with as little as €10, so you can benefit from the bonus while still playing on a budget.
A very rare offer. A bonus this generous is understandably hard to find.
Try new games. A 400% deposit bonus gives you a larger bankroll so you can play more casino games without risking much of your own money.
Max cashout limit. Some 400% bonuses have low cashout limits, as casinos use them to balance the high value of the offer.
Often bundled with free spins. Many 400% offers come with an extra free spins bonus on top, giving you even more ways to try new slot games.
How to Choose a 400% Bonus Casino
The first step in getting your hands on a 400% online casino bonus is deciding where to play. So how do you choose? Here’s a simple 5-step process to find the right 400% bonus casino to start with.
1
Select a casino
Browse through our list of recommended 400% deposit casinos.
2
Read casino reviews
Read casino reviews on Mr. Gamble and other leading industry platforms.
3
Read the bonus terms
Always check the bonus terms and conditions to know what’s expected before you play.
4
Check the wagering requirements
Always review the 400% bonus wagering requirements to know how much you’ll need to play through.
5
Sign up and claim the bonus
Sign up, enter your details, and don’t forget to claim the 400% casino deposit bonus when prompted.
How We Rank and Review 400% Bonus Casino Sites
When you look at the fine print, no two 400 deposit bonus offers are exactly the same. We review each casino bonus carefully to make sure they give you value and aren’t impossible to claim.
The Mr. Gamble team uses an approved list of criteria to make sure you get reliable facts. Each factor is reviewed objectively, with no promotion, focusing on the essentials you need to know when making a casino account.
Casino Licence and Security
We only list casino 400 deposit bonus offers that operate under valid gambling licences (e.g. Curacao or MGA).
We check for SSL encryption, regulated payment providers, iGaming legitimate software providers, and GDPR compliance. The latter ensures your personal and financial data is protected, offering peace of mind that you’re dealing with a legally operated and reputable casino platform.
Fair Bonus Terms
Our review examines wagering requirements, maximum allowable winnings, minimum deposit requirements, and time limits tied to the bonus offer.
We prioritise anycasino deposit bonus of 400% that provides usable, transparent terms rather than restrictive conditions. For example, clear wagering requirements and withdrawal limits will always be better than vague casino promotions.
Eligible Games
The best 400 bonus casino sites cover a multitude of online casino games from top providers.
We assess the quantity and quality of eligible games under the offer, looking at slots, table games, live casino games, and any other eligible mini games. Sites offering a broad selection from respected software providers (e.g., NetEnt, Microgaming) score higher than brands with tight game restrictions.
Payment Methods
400 casino bonuses mean nothing if the payment methods are too restrictive to access them. To combat this, we analyse the deposit and withdrawal options available, looking for debit cards, e-wallets, bank transfers, and cryptocurrencies.
We also check through processing times, transaction fees, minimum deposit limits, and whether the deposit match bonus works with all payment methods. Overall, a diverse and efficient payment infrastructure with secure payment gateways earns top marks.
User Experience
We also look at whether the 400% bonus online casino has a good user experience.
The best online casinos have swift loading speeds, easy navigation, mobile compatibility, and intuitive usability for all players — even those who aren’t tech-savvy. Online casino sites that are laggy or confusing don’t make the cut.
Reputation and Fairness
Most casinos play by the rules, but some sites miss the mark.
To guarantee a safe experience, we consider player feedback and independent audits (from third parties like eCOGRA). We also look for sites with a history of prompt payouts and fair dispute resolution.
Different Types of 400% Bonuses
A casino 400% bonus can come in a few different forms, from welcome deals for new players to reload offers for regulars.
To help you spot the best casino bonuses, we’ve broken down the most common types of 400% offers you’ll come across.
400% First Deposit Bonus
A 400% first deposit bonus casino offer is the simplest way to see how a 400% promotion works. When you make your very first deposit – as long as it meets the minimum amount set in the terms and conditions – the casino will boost it by 400%. This makes a 400 first deposit bonus casino deal one of the most powerful welcome offers, giving you a huge amount of extra funds to start playing with right away.
400 Welcome Bonus Casino Deals
A 400% welcome bonus casino offer is designed especially for new players. To claim it, you simply need to create an account and make your first deposit – after that, the bonus is credited to your balance.
In some cases, a 400 welcome bonus casino deal may also be part of a larger casino welcome bonus package, where you’ll find extra perks such as free spins or reload bonuses alongside the deposit match.
400 Match Bonus Casino Offers
A 400% match bonus casino deal works much like a first deposit bonus, but it isn’t always limited to new players. While a 400% match bonus casino promotion is most often seen as part of a welcome offer, some sites also extend it to existing players through reload bonuses.
Hybrid Bonuses
A hybrid 400 casino deposit bonus combines different bonus types into one promotion. For example, alongside the 400% deposit match, you may also receive free spins or cashback rewards.
Modern hybrid deals allow players to benefit from both extra funds and additional perks, creating a more varied bonus package compared to a standard match offer. Ideal if you’re keen to use bonus credits on different games.
High Roller Bonuses
Now for one of the most exclusive bonuses: a 400% high roller bonus.
This type of 400% deposit bonus casino deal is tailored for players making larger deposits. These promotions usually come with higher maximum bonus limits, but you’ll need to wager more to get your winnings. These tend to be better for experienced players looking to maximise their bankroll from the start.
400 Bonus Codes
Some online casino sites require a 400% bonus code to unlock the offer and boost your deposit. These codes are usually short strings of letters or numbers that you enter during sign-up or at the cashier when making your deposit. They’re also often used for no deposit promotions at many sites.
You’ll usually find a 400 bonus code on the casino’s homepage, promotions page, or in newsletters. Many trusted bonus codes casino sites also collect and list the latest deals in one place. Just be sure to type the code exactly as shown – otherwise, your bonus might not activate.
How to Claim a 400% Deposit Bonus
The process of claiming a 400 deposit slots bonus is almost the same at every online casino. Follow these simple steps to unlock your bonus, start playing, and even have a shot to win real money:
Choose a casino to play at – Pick one from our recommended list of 400% deposit casinos and get started.
Read the T&Cs – Check the bonus terms carefully, including wagering requirements, eligible games, and any limits.
Create your account – Hit the sign-up button, enter your details, and set up your profile.
Deposit money – Head to the cashier, choose a safe payment method, and fund your account with the qualifying amount.
Claim your bonus and play slots – Once activated, your bankroll will be multiplied by 5x, giving you extra funds to explore the casino and play slots or other games.
Key Terms and Conditions of a 400% Deposit Bonus
A 400% casino bonus is undoubtedly a very attractive offer. However, there are some factors you should take into account before you part with your first deposit, no matter how tempted you are. Here are the key factors to consider.
FACTOR
DESCRIPTION
🤑 Minimum deposit
This is the minimum amount you’ll need to deposit in order to qualify for the 400% deposit bonus.
💳 Payment methods
Some casinos restrict specific payment methods from 400 percent casino bonus offers.
💸 Withdraw limits
Gambling sites may place a limit on the amount you can win with the bonus.
📅 Time restrictions
Almost all gambling offers have a limited timeframe, i.e., 7-14 days, or sometimes even 30.
🎲 Game and stake restrictions
Not all games or stakes count equally towards wagering requirements, with slots contributing most and live games least. Play games that contribute more to pass the rollover requirements.
Wagering requirements
Wagering requirements determine how many times you must play through the bonus before you withdraw any bonus winnings (e.g., 35x).
Payment Methods Available at 400% Casino Sites
To claim a casino bonus of 400%, you’ll need a casino with compatible payment methods. Most sites offer a broad selection of payment methods, but there’s never a guarantee that yours will be there. Always double-check!
Generally, payment options vary in speed, fees, and minimum deposit limits, so it’s important to choose one that suits your preferences. Here are the most common ones.
Visa
Visa cards remain widely accepted, allowing straightforward deposits and wide accessibility. However, withdrawal times tend to be longer than with e-wallets.
PayPal
PayPal is a trusted online payment option, providing secure and instant deposits and typically fast withdrawals (approx 48 hours). Getting bonus cash and free spins winnings is easy with this method.
Apple Pay
Apple Pay allows mobile users to deposit quickly using their iOS devices without entering card details. However, it’s not accepted for withdrawals at all online casinos.
Skrill
Skrill is a popular e-wallet for fast deposits and withdrawals, as it doesn’t show the casino your bank details. Read the online casino 400% welcome bonus terms carefully though, as Skrill deposits don’t always qualify.
Neteller
Like Skrill, Neteller offers instant deposits and quick withdrawals, without revealing your payment information. However, it’s also sometimes excluded from welcome bonuses.
Pay by Mobile
As the name suggests, pay by mobile lets players deposit via their phone bill, making deposits quick and simple.
It’s not available for withdrawals, though. You'll need another payment method to withdraw winnings from online casino offers.
Bank Transfer
Bank transfers are a traditional payment method. They’re reliable for larger sums but often take longer to process than e-wallets or cards (e.g., up to 5 working days).
Casino Games to Play With a 400% Deposit Bonus
400% deposit bonuses can be used on a variety of games, but sometimes there are game restrictions, and not all contribute equally to wagering requirements.
Here’s how the top casino game categories interact with this promotion.
Slots – Most slots count 100% towards the bonus wagering and offer fast-paced gameplay. Popular 400 deposit bonus slots include Starburst by NetEnt and Book of Dead by Play’n Go.
Table games – Computer-generated games like blackjack and roulette often contribute less to wagering and may have stake limits.
Live dealer games – Live dealer games typically have minimal contribution to wagering, though they provide an immersive experience. Look for dedicated live dealer bonuses if you want to focus on these games.
Bingo - Bingo often counts partially or minimally towards wagering requirements, if the site hosts bingo rooms. However, most casino bonus offers are for slots and lives.
Best 400% Deposit Bonus Slots
Slots are ideal for a 400% deposit bonus. Once you apply a valid bonus code, you get more bonus money to play a wide range of high-RTP games with exciting features, such as the following.
Withdrawing winnings from a 400% casino bonus is straightforward if you follow the terms and conditions.
Here’s a general step-by-step guide for most online casinos:
Make sure you’ve met the bonus wagering requirement and check that you’ve been playing eligible games.
Select a withdrawal method from the approved options.
Enter the withdrawal amount, making sure it does not exceed any maximum limits set by the casino. You’ll also have to meet the casino’s minimum withdrawal limit.
Make sure your account is verified.
Confirm the request and wait for processing. This can vary depending on the method.
Best 400% Deposit Bonus Alternatives
If, for any reason, you decide not to claim one of the 400% deposit bonuses we’ve highlighted here, there are a few alternative bonuses you might like to consider.
100% deposit bonus is the standard match bonus offer you’ll see at many online casinos. Once you create your account and make your first deposit, the casino will double it.
Make a deposit of €100 and get €100 in bonus money, (€200 in total).
500% casino bonus is an incredible offer, especially for new players. It’s also possibly the rarest casino bonus available.
Make a deposit of €100 and get €500 in bonus money, (€600 in total).
Frequently Asked Questions
Why do online casinos give out 400% first deposit bonuses?
Online casinos give out 400% first deposit bonuses in order to encourage casino players to try out their platforms and consider playing there in the longer term.
Are 400% deposit bonus casino sites safe?
Yes, 400% deposit bonus casino sites are safe, as long as they're licensed and regulated by a reputable body. As well as having passed our test for safety and security, each of the 400% deposit bonus casinos we've recommended here are licensed and regulated by the Malta Gaming Authority (MGA) and/or another reputable gaming authority.
Can I keep winnings from a 400% casino deposit bonus?
Yes, you can keep your winnings from a 400% casino deposit bonus, as long as you've fulfilled the terms and conditions of the promotion.
Can I get free spins as part of the 400% casino bonus?
Yes, you can get free spins as part of a 400% casino bonus if you choose a welcome package that bundles the 400% deposit match with bonus spins.
Can I win real money with a casino 400% bonus?
Yes, you can win real money with a casino 400% bonus, just as you can with any other casino bonus offer.
Alina is Mr. Gamble's Content Creator with strong expertise in iGaming. With a history of working on the casino operator side and an ethical journalistic approach to writing, Alina publishes truthful and accurate content relevant to our readers...
Isobel Coughlan is a seasoned iGaming writer with extensive experience covering the online casino industry, from new slot releases to all-important gambling regulations. ..
