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400% Casino Bonus UK

Most casinos grant bonuses. Generous gambling sites multiply a player’s deposit by up to 100%, effectively doubling it. However, a few top-rated casinos in the UK grant a whopping 400% casino bonus. That’s right, the operator multiplies a player’s deposit by four.

Better yet, we know exactly where to find them. Our experts have researched a list of legit casinos that grant these attractive offers. Discover the top 400% deposit bonus promotions and how to claim them today!

Top 400% Deposit Bonus Promotions

Our casinos are:
Tested by Experts Secure Licensed
1
Cosmobet
Cosmobet Casino logo
Up to 400% Bonus + 1 000 Free Spins
Min Dep
€/£20
Wager
x30
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*Terms & Conditions
100% up to £150 + 50 FS
Min Dep
£10
Wager
x50
Get Bonus
*Terms & Conditions
18+. New UK customers only. Opt in required. Bonus can be claimed only once. Minimum required deposit = £10. Maximum bonus = £150. Bonus money wager = 40x before bonus funds or associated winnings can be withdrawn. Bonus spins wager = 50x before bonus funds or associated winnings can be withdrawn. 50 bonus spins will be credited automatically, if bonus was activated and first deposit was made within 48 hours of registration. Welcome Spins must be used within 24 hours of crediting. Maximum bet = £5 per bet/spin when wagering with bonus money. General T&C and General Promotion Terms apply. Play responsibly. Customers who are displaying indicators of harm (at our sole discretion) are not eligible for any bonuses or promotions.
3
PlayUK Casino
PlayUK Casino logo
Bet £20 on slots for 100 Free Spins on Big Bass Splash
Min Dep
£20
Wager
x40
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*Terms & Conditions
First deposit only. Min deposit £20. Min wager £20 on slots. Max 100 Free Spins. Max one claim. Spins credited within 7 days after deposit. Spins valid on Big Bass Splash. Spin value 10p. Full T&C's Apply.
4
Exclusive
BeOnBet
BeOnBet Casino
150% up to €450 + 150 Free Spins
Bonus code :
BETBEZILLA
Code copied
Min Dep
€20
Wager
x40/x35
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*Terms & Conditions
5
New
7bet
7bet Casino
Up to 50 on your 1st deposit
Min Dep
£10
Wager
x40
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*Terms & Conditions
1st deposit only | min deposit 10 | max bet 2 | max bonus 50 | 40x wagering | Max cashout 350 | Bonus is valid for selected games only | 30-day bonus expiry | User Agreement & Bonus T&C apply | 18+ BeGambleAware
6
Snatch Casino
Snatch Casino logo
450% + 325 Free Spins
Min Dep
€10
Get Bonus
*Terms & Conditions
100 Free Spins on Big Bass Splash when bet £10
Min Dep
£10
Wager
x40
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*Terms & Conditions
New customers only. £10 min deposit. Opt-in and Bet £10+ on any slot, winnings paid as cash. 100 Free Spins on Big Bass Splash, £0.10 per spin. Winnings paid as cash, £100 Max win. Additional T&Cs apply.
8
iWild Casino
iWild Casino logo
550% up to €4 000 + 550 Free Spins
Min Dep
€20
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*Terms & Conditions
9
Ybets
Ybets Casino
500% Welcome Bonus up to $8 000 + 400 Free Spins
Min Dep
$15
Wager
x30/x40
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*Terms & Conditions
10
New
Rollino Casino
Rollino Casino
450% UP TO £6000 + 325 FS ON FIRST 4 DEPOSITS
Min Dep
£20/£50/£50/£50
Wager
x40
Get Bonus
*Terms & Conditions
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How Does a 400% Bonus Work?

A 400% bonus is a casino promotion in which the site matches your deposit by 400%. In other words, the operator takes your deposit and grants you four times that amount as a gift.

For instance, if you deposit £50, the casino applies the bonus multiplier, granting you £200 in bonus funds (£50 × 400%). The total balance becomes £250 (£50 deposit + £200 bonus). Depending on the casino, you may receive bonus cash with free spins, say 400% up to £1,000 + 200 free spins.
400 deposit bonus

Benefits and Drawbacks of the 400% Deposit Bonus

The 400 welcome bonus boosts bankroll by 4x, providing additional gambling funds. At the same time, the lucrative offer may encourage players to take higher risks, potentially leading to losses beyond their original deposit. Discover the pros and cons of 400% casino bonuses below.

dragon
  • A 400% bonus extends a player’s gaming session

  • A great incentive for newbies who want to test games or develop strategies

  • It increases the possibility of higher payouts

  • Requires a low minimum deposit

dragon
  • High wagering requirements make it challenging to withdraw winnings

  • Some games don’t contribute to the wagering

How Slotozilla Experts Rate Online Casino Bonus Offers

At Slotozilla, we adopt a unique approach to rate online casino bonus offers. We explore factors that affect the gambling experience from the player’s point of view to provide accurate and reliable ratings. In the end, we simplify our research by giving each casino a rating score. Below are some criteria we use to assess a bonus.

The 400% deposit bonus comes in different forms. Casinos tailor the promotions to cater to different player preferences and their promotional strategies. As a result, the reward is for new and existing players. The most popular types of 400% bonuses are in the table below.

Types of Bonuses Description
First deposit bonus This promo is exclusively for new players. Casinos grant the bonus on the gambler’s initial deposit. As a result, it has a reasonable minimum deposit requirement and may include free spins
Welcome packages Some casinos spread the 400% bonus across multiple deposits. Hence, although it is for new players, it does not only apply to the first deposit. For example, 400% up to £300 on the first deposit, 400% up to £200 on the second deposit, and £400% up to £250 on the third payment
Free spins Casinos sometimes bundle a 400% deposit bonus with a certain number of free spins to play slots. This reward is for slot enthusiasts looking for a large bonus. If you deposit £200, the casino may award £8,000 and 200 free spins to play a popular slot game like Gonzo’s Quest
Promo codes Players who enjoy tracking exclusive deals enjoy a unique 400% bonus that requires entering a promo code during the deposit process. Unlike others, you cannot activate the bonus with your deposit alone. For instance, you may need to enter the code “BONUS400” when paying £100 to get a £400 bonus
High rollers The 400% high roller bonus is for players who deposit large sums. The minimum deposit threshold is usually higher for high-stakes players. For instance, a £1,000 deposit may receive a £4,000 bonus, earning a total bankroll of £5,000

Step-by-Step Guide for Claiming a 400% First Deposit Bonus

Follow these steps to activate your reward:
How to Registration
1

Registration

Browse our casino listing and click the link to visit your preferred online gambling site. Click “Register” and provide personal information, such as name, email, and date of birth. Set up a username and password and agree to the casino’s terms.

How to Verification
2

Verification

Visit your email or SMS and click on the link from the casino to verify your account.

How to Deposit
3

Deposit money

Log into your account and go to the “Deposit” section. Choose your preferred payment method and enter an amount not lower than the minimum deposit to claim the first deposit offer for new players. If the promotion requires a bonus code, enter the code in the appropriate field.

How to Start gambling
4

Start gambling

After a successful deposit, the casino will credit your account with the bonus automatically. Go to the lobby and start playing eligible games.

400% Bonus Terms and Conditions

Casino promotions have terms that guide usage, including the 400% bonus. Follow these rules to avoid losing your bonus + associated winnings.

Eligibility

The 400 welcome bonus is for new players, while existing gamblers benefit from reload bonuses, cashback, and VIP perks. Some online casinos restrict players from certain countries or ages, usually 18 years.

Wagering Requirements

This is the number of times you must wager the bonus or bonus + deposit before you can withdraw winnings. If the wagering requirements are 30x and you receive £10, you must wager £300 (£10×30).

Game Contribution

Games contribute differently towards meeting the wagering requirements. Slots often contribute 100%. In other words, every £1 wagered counts as £1. In contrast, table games may contribute 10% or nothing.

Minimum Deposit, Maximum Bet, and Maximum Win

The minimum deposit is how much you must pay to activate the bonus. Players who bet above the maximum bet will lose their bonus and winnings. The maximum win restricts how much you can win from playing with the bonus. If the max win cap is £200 and you win £400, you cannot withdraw more than £200.

Expiry Period

Bonuses expire after a couple of days. Depending on the casino, the timeframe could be 3, 7, or 30 days. Players who don’t meet the wagering requirements during this period lose their bonus and winnings.

Bonus Abuse

Players who abuse their bonus risk account suspension or termination. Actions that constitute abuse include attempting to claim a 400 deposit bonus more than once by creating multiple accounts, claiming multiple bonuses simultaneously, and collusion with other players to exploit bonuses.

Other Casino Bonuses to Try

Any match deposit bonuses are juicy but rare. Our team has combed the web for alternative bonus offers that promise an equally exciting gambling journey.

400% Casino Bonus – Our Final Thought

The 400% casino bonus increases bankroll by 4x. With this newfound money, you can play games, develop strategies, and possibly win money. As a result, they are a must-have. That said, always read the terms, especially the wagering requirements, before claiming a 400% bonus.

Avoid promotions that seem too good to be true, as they often are. In the end, choose an online casino whose offering suits your gaming preferences. As our research shows, consider the casino’s reputation, ease of claiming, and available offers. Claim your 400% casino bonus today and start playing real money games!

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