The Best 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:
- FREE 20 freespins no deposit
- Deposit Bonus 100% 300€
- FREE 25 Freespins to Book of Dead - NO DEPOSIT. IMPORTANT - USE Promo Code: BOOK25 after registration to get the spins!
- Deposit Bonus Deposit bonus 300% up to 300 EUR. Use code KB300. 35x wager
- FREE 50 free spins no deposit
- Deposit Bonus 100% 300€
- Deposit Bonus 100% 500€
- FREE 200 free spins (deposit needed)
- FREE 10 Freespins to Dawn of Olympus – NO DEPOSIT. IMPORTANT – USE Code: Olympus10 after registration to get the spins!
- Deposit Bonus 300% to 600 EUR
- FREE 25 Freespins to Book of Museum – NO DEPOSIT. IMPORTANT – USE Code: LP25 after registration to get the spins!
- Deposit Bonus 300% to 600 EUR
- FREE 25 Freespins to Angry Dogs – NO DEPOSIT. IMPORTANT – USE Code: LP25 after registration to get the spins!
- Deposit Bonus 100% to 1000 EUR
- FREE 25 Free Spins NO Deposit to Hollywoof (Gameart). IMPORTANT – USE Code: LP25 after registration to get the spins!
- Deposit Bonus 300% to 600 EUR
- FREE 30 Freespins to Sweet Bonanza – NO DEPOSIT. IMPORTANT – USE Code: “KASBONUS30” under “My account” -> “Bonuses and gifts”
- Deposit Bonus 100% up to 1950 EUR + 150 free spins
- FREE 15 Freespins NO DEPOSIT to Mini Games: AERO, Frog, Teleport, Icefield, Roulette, Chicken, Dino
- Deposit Bonus 100% to 1000€
- FREE 25 Freespins to Ruby Win Hold the Spin - NO DEPOSIT. USE Code: "shoruby" after registration
- Deposit Bonus 100% up to 2000 EUR + 100 free spins
- FREE 20 Free Spins NO Deposit
- Deposit Bonus 100% to 100 EUR
- FREE 100 freespins no deposit needed (Betfury Bonanza, Joker Stoker, Bastet, Cats)
- Deposit Bonus 200% to 500$ USE CODE: KASINOBONUS
- FREE 32$, no deposit bonus, use code FREE32KASI
- Deposit Bonus 250% match bonus
- FREE 50 free spins (deposit needed)
- Deposit Bonus 100% 250€
- FREE 100 free spins (deposit needed)
- Deposit Bonus 100% 200€
- FREE Deposit 10€ -> Get 100 Freespins - NO WAGER!
- Deposit Bonus 100 wager free spins (50$ deposit needed)
- 10% Cashback Sportsbetting
- FREE 50 Free Spins (deposit needed)
- Deposit Bonus100% 300€
- FREE 50 freespins (10€ deposit needed)
- Deposit Bonus 100% 200€
- FREE 100 freespins (deposit needed)
- Deposit Bonus 100% 300€
- Deposit Bonus 100 free spins (deposit needed)
- 10% cashback Mondays
- FREE 50 free spins (deposit needed)
- Deposit Bonus 100% 300€
- FREE 30$ (25$ deposit needed)
- Deposit Bonus 250% match bonus
- Deposit Bonus 200 free spins (deposit needed)
- Deposit Bonus 200 freespins (deposit needed)
- FREE 50 Freespins to Gates of Olympus – NO DEPOSIT. IMPORTANT – USE promo code: BLITZ3 at registration!
- 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 10 Freespins to Sugar Rush - NO DEPOSIT. IMPORTANT - USE Promo Code: KBONUS at registration to get the spins!
- Deposit Bonus 225% to 2000€
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.
Written by Matti Slotte