The Best 300% Deposit Bonus in the UK
A 300% deposit bonus is one of the biggest match bonuses you can find, offering a whopping 300% boost on your deposit! This means you end up with four times your initial deposit—making it a solid choice for players wanting to maximise their funds and extend sessions.
In this guide, I’ll cover how 300% matched deposit bonuses work, where to find them, and why they’re worth considering.
Casinos Offering 300% Bonuses
As the name implied, a 300% matched deposit bonus boosts your deposit by… 300%! This means, a £10 deposit, for example, would see your account credited with £30 in bonus funds bringing your total balance to £40! Sounds good? Then check out my recommended casinos where you can claim this bonus 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 selected a casino, making a qualifying deposit will unlock your 300% match bonus, giving you plenty of extra funds to enjoy!
How We Review Casinos
When reviewing online casinos offering 300% bonuses, my team and I check various factors. Firstly, we ensure they’re properly licensed—without an online gambling license, you don’t know if they’ll pay you your winnings, or if their games are fair! Here at KasinoBonus, we also test and review all casinos personally—allowing us to report directly to you on things like payout speeds, customer support facilities, and deposit options.
Why claim a 300% deposit bonus?
A 300% deposit bonus might sound too good to be true, but when claimed at a casino that offers fair terms and a strong game selection, it can provide exceptional value for money.
These types of promotions give you a huge starting balance, allowing you to try different games, experiment with betting strategies, and enjoy extended gameplay—without additional risk! It’s also an excellent way of trying out a new casino, without risking as much of your own cash!
Written by Matti Slotte