20+
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400% Deposit Bonus in the UK

A 400% deposit bonus is a HUGE promotion offered at certain online casinos that gives you four times you deposit in extra bonus funds! If, for example, you deposited £100, your account would be credited with a whopping £500 in total funds for you to play with!

Naturally, 400% deposit bonuses aren’t the easiest to come by—but in this guide, I’m going to show you where to find them, and why you can trust KasinoBonus’ recommendations!

Casinos Offering 400% Bonuses

While 400% deposit bonuses in the UK aren’t always the easiest to find, there are some reputable casinos currently offering them. If you’re looking to claim a 400% bonus, and want to know the safest casinos to claim them at, check out our personalised picks, below:

USE Code: BLITZ3 at registration

Bet on Red

4.9/5
  • Deposit Bonus Deposit only minimum 10 EUR / 15 EUR / 20 EUR- You will get 100% deposit bonus up to 100€ and 150 Free Spins to Gates of Olympus!
  • FREE 50 Freespins to Gates of Olympus – NO DEPOSIT. IMPORTANT – USE promo code: BLITZ3 at registration!
50 Freespins to Gates of Olympus – NO DEPOSIT. IMPORTANT – USE promo code: BLITZ3 at registration!
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USE Code: ROLLINO20 at registration

Rollino

4.9/5
  • Deposit Bonus 450% UP TO €6000 + 325 FS ON FIRST 4 DEPOSITS
  • FREE 20 Freespins to Sweet Bonanza – NO DEPOSIT. IMPORTANT – USE promo code: ROLLINO20 at registration! Activate under your profile in the ‘Bonuses’ tab
20 Freespins to Sweet Bonanza – NO DEPOSIT. IMPORTANT – USE promo code: ROLLINO20 at registration!
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Use Code: KB300

BetMaximus

4.8/5
  • Deposit Bonus Deposit bonus 300% up to 300 EUR. Use code KB300. 35x wager
  • FREE 25 Freespins to Book of Dead – NO DEPOSIT. IMPORTANT – USE Promo Code: BOOK25 after registration to get the spins!
First Deposit Bonus 300% up to 300 EUR. Deposit 100 EUR play with 400 EUR!
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NO WAGER!

Casino universe

4.8/5
  • Deposit Bonus 50 Freepsins to Starburst – Deposit only 10€ – NO WAGER!
50 Freepsins to Starburst – Deposit only 10€ – NO WAGER!
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EXCLUSIVE

Drip Casino

4.8/5
  • Deposit Bonus 150% 600€
  • FREE 50 free spins no deposit
50 FREE SPINS NO DEPOSIT – Alien Fruits (BGaming)
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EXCLUSIVE

Fresh Casino

4.8/5
  • Deposit Bonus 100% 300€
  • FREE 50 free spins no deposit
50 FREE SPINS NO DEPOSIT – Doors Of Fresh (BGaming)
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EXCLUSIVE

Izzi Casino

4.8/5
  • Deposit Bonus 100% 300€
  • FREE 50 freespins no deposit
50 FREE SPINS NO DEPOSIT – Izzi Art (BGaming)
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EXCLUSIVE

Jet Casino

4.8/5
  • Deposit Bonus 100% 300€
  • FREE 50 freespins no deposit
50 FREE SPINS NO DEPOSIT – Candy Monsta (BGaming)
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EXCLUSIVE

Legzo Casino

4.8/5
  • Deposit Bonus 100% 300€
  • FREE 50 freespins no deposit
50 FREE SPINS NO DEPOSIT – Legzo Punk (BGaming)
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EXCLUSIVE

Sol Casino

4.8/5
  • Deposit Bonus 100% 300€
  • FREE 50 freespins no deposit
50 FREE SPINS NO DEPOSIT – Doors Of Sol (BGaming)
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show more

Once you’ve found your ideal casino, simply sign-up and make a qualifying deposit, and you’ll unlock your 400% bonus right away!

How We Review Casinos

Here at KasinoBonus, we know how important it is that you can find—and play at—safe online casinos. That’s why we have a dedicated team working round-the-clock testing, reviewing, and evaluating casinos!

Our team personally joins and plays at each casino we review, allowing us to give you our honest, first-hand experiences. We look for a number of different metrics including game selection, bonus terms, payout speeds, customer support facilities, and, of course, licensing and security.

Matti Slotte
Author Matti Slotte

Matti Slotte is a Kuopio-born professional in the online gambling industry, currently acting as the owner and editor-in-chief of KasinoBonus.io, his latest project dedicated to elevating the Finnish gambling market onto a new level.

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Written by Matti Slotte