English
Fortunica

290% up to £3 000 + 200 Free Spins

Get Bonus
Special Offers
  • Special BonusesSpecial Bonuses
Special Offers
English

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!

Filters APPLIED
Bonus AmountClear
Min (2) Max (24800000)
Bonus Value (%)Clear
Min (0) Max (5350)
Number of Free SpinsClear
Min (0) Max (50350)
21Results found
Bonus Value Score (BVS)
Popularity
Recently added
Showing 1-10 of 21 bonuses
Spinner
Updated 26/10/2026
700% + 325 Free Spins Wagerless
Verified by
Jordan Conroy
on July 1, 2026
Wager (Bonus Funds)
20x
Valid (Cash Bonus)
7 Days
Minimum Deposit
30 £
Deposit Bonus
700%
Get Bonus
0 times claimed
Did you successfully receive this bonus?
Yes
No
See bonus statistics
Show More Details Icon
Spinner
Updated 26/10/2026
Exclusive
400% tot €1200 + 200 Free Spins
Verified by
Jordan Conroy
on July 1, 2026
Wager (Bonus Funds)
30x
Wager (Free Spins)
30x
Valid (Cash Bonus)
21 Days
Valid (Free Spins)
21 Days
Minimum Deposit
20 £
Deposit Bonus
400%
Get Bonus
0 times claimed
Bonuscode:
PLAY1200
Did you successfully receive this bonus?
Yes
No
See bonus statistics
Show More Details Icon
Spinner
Updated 29/10/2026
900% + 150 Free Spins
Verified by
Jordan Conroy
on October 8, 2026
Wager (Bonus Funds)
33x
Wager (Free Spins)
33x
Maximum Payout
1000 £
Minimum Deposit
20 £
Deposit Bonus
900%
Get Bonus
0 times claimed
Did you successfully receive this bonus?
Yes
No
See bonus statistics
Show More Details Icon
Spinner
Updated 30/10/2026
550% tot €15000 + 550 Free spins
Verified by
Jordan Conroy
on September 29, 2026
Wager (Bonus Funds)
30x
Wager (Free Spins)
30x
Minimum Deposit
25 £
Deposit Bonus
550%
Get Bonus
0 times claimed
Did you successfully receive this bonus?
Yes
No
See bonus statistics
Show More Details Icon
Spinner
Updated 26/10/2026
Welcome Bonus €4000 + 400 Free Spins
Verified by
Jordan Conroy
on July 1, 2026
Wager (Bonus Funds)
40x
Wager (Free Spins)
40x
Valid (Cash Bonus)
20 Days
Minimum Deposit
20 £
Deposit Bonus
420%
Get Bonus
0 times claimed
Did you successfully receive this bonus?
Yes
No
See bonus statistics
Show More Details Icon
Spinner
Updated 05/10/2026
Welcome Bonus 525% UP TO €3,000 + 350 FS
Verified by
Jordan Conroy
on August 15, 2026
Wager (Bonus Funds)
35x
Wager (Free Spins)
40x
Minimum Deposit
20 £
Deposit Bonus
525%
Get Bonus
0 times claimed
Did you successfully receive this bonus?
Yes
No
See bonus statistics
Show More Details Icon
Spinner
Updated 26/08/2026
Up to €5000 + 150 FREE SPINS
Verified by
Jordan Conroy
on August 26, 2026
Wager (Bonus Funds)
30x
Wager (Free Spins)
30x
Valid (Cash Bonus)
7 Days
Valid (Free Spins)
7 Days
Minimum Deposit
10 £
Deposit Bonus
675%
Get Bonus
0 times claimed
Did you successfully receive this bonus?
Yes
No
See bonus statistics
Show More Details Icon
Spinner
Updated 26/10/2026
Krijg 550% tot €11500 + 200 Free Spins
Verified by
Jordan Conroy
on August 10, 2026
Wager (Bonus Funds)
30x
Wager (Free Spins)
30x
Valid (Cash Bonus)
7 Days
Valid (Free Spins)
7 Days
Minimum Deposit
10 £
Deposit Bonus
550%
Get Bonus
0 times claimed
Did you successfully receive this bonus?
Yes
No
See bonus statistics
Show More Details Icon
Spinner
Updated 26/10/2026
400% Bonus up to $10,000 + 300 Free Spins
Verified by
Jordan Conroy
on July 31, 2026
Wager (Bonus Funds)
40x
Wager (Free Spins)
40x
Minimum Deposit
20 £
Deposit Bonus
400%
Get Bonus
0 times claimed
Did you successfully receive this bonus?
Yes
No
See bonus statistics
Show More Details Icon
Spinner
Updated 26/10/2026
New Bonus
New Brand
Welcome Package €10000 + 800 Free Spins
Verified by
Jordan Conroy
on October 23, 2026
Wager (Bonus Funds)
40x
Wager (Free Spins)
35x
Valid (Cash Bonus)
7 Days
Valid (Free Spins)
7 Days
Minimum Deposit
30 £
Deposit Bonus
600%
Get Bonus
0 times claimed
Did you successfully receive this bonus?
Yes
No
See bonus statistics
Show More Details Icon

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.

  • Bonus amount: Casinos with high bonus amounts rank better on our list because players receive sufficient bonus cash or free spins to gamble. Besides extending gameplay, recipients try new games, develop strategies, and possibly win money.
  • Fairness of T&Cs: Our experts check the terms to verify their fairness. We assess the wagering requirements, limits, and expiry period. We prefer casinos with terms that are easier to fulfill, as the probability of withdrawing real money is higher.
  • Ease of claiming: Bonuses should be easy to claim. As a result, we recommend casinos with clear instructions for activating promos. The offer should involve minimal steps and cater to a wide range of players. Likewise, it should be available via mobile apps, websites, and desktops.
  • Casino’s reputation: We only consider casinos with welcome bonus that hold a valid licence from a reputable gambling authority like the UKGC, MGA, or Curaçao eGaming in our rankings. Our reviewers research the website’s payout reliability, customer support, and past player reviews to know if they are trustworthy.

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!

Jordan Conroy
By Jordan Conroy
Chief Editor
Log in to your Account
Create an Account
Username
... 0 /20
Email Address
...
Your Country
...
Argentina
Australia
Austria
Belgium
Brazil
Bulgaria
Canada
Chile
Colombia
Cyprus
Czechia
Denmark
Ecuador
Finland
France
Georgia
Germany
Greece
Hungary
India
Indonesia
Ireland
Italy
Latvia
Lithuania
Luxembourg
Malaysia
Mexico
Netherlands
New Zealand
Norway
Panama
Peru
Philippines
Poland
Portugal
Serbia
Slovakia
Slovenia
South Africa
Spain
Sweden
Switzerland
Turkey
Ukraine
United Kingdom
United States
Uruguay
Venezuela
Password
...
Confirm Password
...
I confirm that I am over 18 years old and legally allowed to participate in gambling
I have read and agree to the Cookies Policy and Terms & Conditions.
Forgot password

Enter the email address associated with your account and we’ll send you a link to reset your password.

Email Address
...
Check your inbox

We’ve sent a link to reset your password. If you don’t see it, check your spam or junk folder.

Registration Successful

Your account has been created successfully.

Go to account
What is the ISSUE?

0/200

0/200
Report
Thank you for your request!
To be notified when your game is fixed, please leave your email below
Subscribing you are certifying that you are over the age of 18 years
What is RTP?

RTP, or Return to Player, is a percentage that shows how much a slot is expected to pay back to players over a long period. It’s calculated based on millions or even billions of spins, so the percent is accurate in the long run, not in a single session.


In casino games, the ‘house edge’ is the common term representing the platform’s built-in advantage. For example, it is about 0.5% in blackjack, meaning the casino holds 0.5% of all bets over time.
RTP is the key figure for slots, working opposite the house edge and showing the potential payoff to players.


Let’s consider the example: 
The Book of Dead has an RTP of 94.25%. It means that for every $100 bet, you can expect to receive $94.25 back in the long run. The remaining $5.75 is what the casino keeps.

We use cookies as set out in our privacy policy. By clicking on this pop up, you agree to our policies.

Privacy Policy
Accept
Invaders Megaways Slot by WMS
RTP: 96.3% RTP
Bonus
Something wrong with the game? Click here to know more.
Bug Report
Fullscreen
Close
Invaders Megaways
This slot isn’t available
Don’t be upset — you can try most suitable slots in this category here.
Related slots
Invaders Megaways
Invaders Megaways
WMS
ZR:
1
RTP: 96.3%
Derby Wheel
Derby Wheel
Play'n Go
ZR:
2
RTP: 94.2%
Stitchers Get Stitches
Stitchers Get Stitches
StakeLogic
ZR:
3
RTP: 95.98%
Mine Slot Halloween
Mine Slot Halloween
InOut Games
ZR:
4
RTP: 96%
Rump And Halloween
Rump And Halloween
InOut Games
ZR:
5
RTP: 96%
Avia Wheel
Avia Wheel
InOut Games
ZR:
6
RTP: 95%
Chicken vs Zombies
Chicken vs Zombies
InOut Games
ZR:
7
RTP: 95.5%
The Castle of Slotenstein
The Castle of Slotenstein
Evoplay
ZR:
8
RTP: 96.2%
play now
Play Now