300% Deposit Bonus Casino in the UK
A 300% deposit bonus casino is one of the biggest match deposit 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.
Top 300% Deposit Bonus Casinos 2025
As the name implies, a 300% casino 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:
- Play on Android, iOS, and desktop
- Live chat support is available 24/7
- VPN allowed
- Deposit Bonus 225% UP to 450£ + 250 FS ON YOUR FIRST 3 DEPOSITS
- FREE 20 freespins no deposit
- Deposit Bonus 100% 300€
- 50 no deposit free spins with promo code 50FS
- Solid lineup of providers — Pragmatic, Nolimit City, Relax
- Quick withdrawals and decent support
- Built‑in crypto wallets with support for over 20 coins
- 4,000+ games
- Tiered VIP ladder offering
- Home to more than 80 gaming providers
- 24/7 live chat
- Excellent selection of payment methods
- Regular players can benefit from their loyalty program
- No deposit bonuses can be activated
- Their online slots include titles with progressive jackpots
- For bettors, they provide a sports betting section
- Total value of free spins: €2 (20 spins at €0.1 per spin)
- Wagering criteria: 40X
- Maximum bet: €0.5 (wagering)
- Operate under UKGC and MGA
- Live chat available
- Mobile friendly design
- Top tier software providers
- Supports 9 languages
- Many responsible gambling tools
- Extensive game collection
- 24/7 live support
- No wagering: 50 free spins without wagering for Gates of Olympus when you make a deposit.
- Deposit bonus: 250 free spins for 3 first deposits
- FREE 100 freespins (deposit needed)
- Deposit Bonus 100% 300€
- Extensive game selection from over 150 software providers
- Mobile-optimised website
- Offers both traditional sports betting and eSports
- Multiple payment options
- Home to leading software providers
- Live chat is available
- Home to more than 5,000 games
- 24/7 live chat
- Multi-lingual support available
- Welcome bonus 100% up to €500 + 200 FS + 1 Bonus Crab
- Weekly Reload 50 Free Spins
- Weekend Reload Bonus €700 + 50 Free Spins
- FREE 100 freespins no deposit needed (Betfury Bonanza, Joker Stoker, Bastet, Cats)
- Deposit Bonus 200% to 500$ USE CODE: KASINOBONUS
- FREE 32$, no deposit bonus, use code FREE32KASI
- Deposit Bonus 250% match bonus
- FREE 100 free spins (deposit needed)
- Deposit Bonus 100% 200€
- FREE Deposit 10€ -> Get 100 Freespins - NO WAGER!
- Deposit Bonus 100 wager free spins (50$ deposit needed)
- 10% Cashback Sportsbetting
- FREE 30$ (25$ deposit needed)
- Deposit Bonus 250% match bonus
- 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
Once you’ve selected a casino, making a qualifying deposit will unlock your 300% match bonus, giving you plenty of extra funds to enjoy!
Now, a few things to remember:
- Some payment methods are excluded from claiming welcome bonuses – notably, Skrill and Neteller – so you’ll want to keep this in mind.
- Wagering requirements apply – always – with a 300% matched deposit bonus. The lower the wagering requirements, the better.
- Some casinos will have a maximum cashout limit, although here at KasinoBonus, we generally only list the best casinos that don’t cap your winnings.
What is a 300% Deposit Bonus?
A 300% deposit bonus is one of the most generous bonuses and promotions you’ll find at online casinos today – and, as the name suggests, they match your deposit by a whopping 300%! Let’s say you made a deposit of £20, for example, and claimed a 300% matched deposit bonus. The casino would give you a total of £60 in bonus funds + your £20 deposit – bringing your total account balance to £80!
How We Review Casinos
When reviewing online casinos offering 300% deposit 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.
Our team looks at a huge range of factors when reviewing online casinos. This includes:
- Licensing information
- Payout speeds (and deposit/withdrawal methods)
- Customer Support facilities
- Mobile usability
- Game selection (and which software providers they offer)
- Bonus terms (and overall bonus generosity)
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!
Types of 300% Deposit Bonuses
While less common than 100% or 200% bonuses, 300% deposit bonuses still appear at some online casinos – and they’re usually awarded as part of aggressive promotional campaigns. Here are the main types you might come across:
- Welcome Bonus:
Some casinos offer a 300% match on your first deposit to attract new players. These bonuses are often capped at a relatively low amount (e.g., deposit £20, get a £60 bonus) and may include free spins as part of the package. - Low Deposit Bonus:
Targeted at casual or budget players, this type gives a big bonus percentage on a small deposit – often as low as £10! - Crypto-Specific Bonus:
Some crypto casinos offer 300% bonuses exclusively for deposits made with Bitcoin or other cryptocurrencies. These promotions are designed to encourage crypto use and may come with slightly different terms – but they’re usually more favourable then fiat-based bonuses. - Limited-Time Promotions:
Occasionally, a casino will roll out a 300% deposit bonus for a short period – often during holidays, special events, or the launch of a new game. These are usually one-off deals with stricter terms.
Top 3 Deposit Bonus Offers
| 🎰 Casino Brand | 🕹️ Game | 🎁 Bonus | 🏷️ Bonus Code | 📋 Wagering / Terms | Play |
|---|---|---|---|---|---|
 BC Game | Multiple Games | Up to 470% + 400 FS | – | Deposit required Crypto-friendly | Play Now |
| Jackpot Raider | Multiple Games | 225% up to £450 + 250 FS | BEST ENGAGEMENT | 3 deposit bonuses + spins included | Play Now |
| NationalBet | Gates of Olympus | 250 FS + 50 FS | Exclusive | No wagering free spins + 3 deposit bonus | Play Now |
How to Claim a 300% Deposit Bonus
Claiming a 300% matched deposit bonus is very easy – and you just need to follow the simple steps below to claim yours!
- Create an account at the casino offering the 300% bonus. (Make sure to choose one of KasinoBonus’ recommended casinos, as they’ve all been hand-picked by our team of online gambling experts.)
- Check the promotions page to ensure the offer is live and see any specific requirements.
- Enter a bonus code if needed during registration or deposit (not all offers require one).
- Make a qualifying deposit that meets the minimum threshold – usually around £10–£20.
- Wait for the bonus to be credited – usually, this is instant – but it could take a few minutes.
- Start playing with your bonus (in the UK, most casinos separate your real money balance from your bonus funds – so you can withdraw anything you win provided you haven’t yet dipped into the bonus funds.)
- Meet the wagering requirements before requesting a withdrawal.
300% Deposit Bonus Terms and Conditions
A 300% deposit bonus can offer massive value, but these bonuses usually come with stricter terms and conditions than smaller bonuses – like 100% deposit matches. Here are the main terms to watch out for:
- Wagering Requirements: Because the bonus amount is so large, casinos typically attach higher wagering requirements – sometimes 40x or even 60x the bonus amount. You need to complete these wagering requirements before you can withdraw any winnings.
- Game Restrictions: Most 300% bonuses are limited to slots, with table games, live dealer games, or jackpots either excluded or contributing very little to wagering. Always check which games are eligible before playing.
- Time Limits: You’ll usually need to complete the wagering requirements within a set period of time – often within 7 days. After that, the bonus and any associated winnings may be removed.
- Maximum Bet Limits: Casinos often cap the maximum amount you can bet per spin or hand while the bonus is active (typically around £5). Exceeding this can void your bonus!
- Withdrawal Limits: Some 300% bonuses – especially for small deposits – may come with a max cashout cap – e.g. 10x your total deposit amount. this means you can’t withdraw more than a certain amount, even if you win big.
As always, read the full bonus terms before claiming. The bigger the bonus, the more important it is to understand exactly what you’re agreeing to!
Alternatives to 300% Deposit Bonuses
| Bonus | Bonus Calculation for £10 Deposit | Total Amount to Play With (£) |
| 100% deposit bonus | £10 for £10 | £20 |
| 400% deposit bonus | £40 for £10 | £50 |
| 500% deposit bonus | £50 for £10 | £60 |
| 600% deposit bonus | £60 for £10 | £70 |
| 1,000% deposit bonus | £100 for £10 | £110 |
| 200% deposit bonus | £20 for £10 | £30 |
| 50% deposit bonus | £15 for £10 | £15 |
Pros & Cons
✅ Pros
- ✅ Higher bonus amounts compared to no-deposit offers
- ✅ Unlocks access to welcome packages and VIP perks
- ✅ Often includes both bonus cash and free spins
- ✅ Great value for players who already plan to deposit
- ✅ Widely accepted across most online casinos
❌ Cons
- ❌ Comes with wagering requirements (sometimes 30x–50x)
- ❌ Bonus funds may be locked until conditions are met
- ❌ Some games are excluded from bonus play
- ❌ Max bet limits may apply while using bonus
- ❌ Withdrawal is often restricted until bonus is cleared
Why Trust KasinoBonus?
At KasinoBonus, trust is the foundation of everything we do. Here’s why thousands of readers rely on us:
- 50,000 readers every month
- 150 online casinos are tested
- 400+ hours per month spent on casino research and content creation
- Every casino we list is personally tested by our team (screenshots of accounts, deposits, and wins).
- Our reviews are written and reviewed by iGaming professional Matti Slotte with 18 years of experience in poker, casino operations, and European gambling regulation.
- We talk openly about our affiliate partnerships and never accept payment for positive reviews.
- We update our rankings and bonus details every month to show the most accurate and up-to-date information available.
- We recommend only licensed, safe, and responsible online casinos.
Responsible Gambling Resources
Online gambling is an entertainment with the purpose of having a good time, but is not intended for financial gain. You should not pursue winning. Gambling addiction is a behaviour that can have very serious consequences for your life. If you feel you can not stop gambling, seek help immediately - all the contacts you need can be found on our Gambling Addiction page.
Gambling Foundation offers free and confidential support to anyone suffering from problem gambling in Finland.
