The UK's Best Online Casino Bonuses In 2021
Get the biggest bonuses available in the United Kingdom
our casino check & review process ensures you get:
- The most lucrative bonuses
- Fast payouts and great customer service
- To enjoy your favourite games, with bonuses and perks
If you're looking for a great bonus, UK online casino sites have plenty of valuable offers in 2021. Our internet gambling experts have searched and compared every online casino bonus in Britain to find the top offers.
It doesn't matter if you prefer slot machines, table games, or poker, we'll direct you to secure casino sites with huge real money rewards. From free bonuses with no deposit to lucrative free spins, you can get the best promotions and extras.
Every recommended site on this page features:
- Great promos and enormous real money bonuses
- Secure deposit and withdrawal methods
- Unrivalled safety and full player privacy
Top 3 Welcome Bonuses
Top 3 Reload Bonuses
Top 3 Deposit + Free Spins
Top 3 Game Specific Bonuses
Getting Acquainted With Bonuses
If the idea of an online casino bonus offer seems too good to be true, it's worth examining the logic behind them. There are more than a hundred licensed gambling sites vying for your business in the UK. In order to attract players and keep them happy, casinos dole out big bonuses. They can afford to do this because they aren't paying the high overhead of a physical casino.
Below are some bonus types you can take advantage of:
- Casinos will give you free cash on top of your initial deposits as a welcome
- This is usually done as a percentage of your deposits and might be spread out across your first few transactions
- To claim this bonus, you may need to accept it when making your first deposits or use a specific welcome code
No Deposit Bonuses
- Players can claim free cash without a deposit
- You'll usually only get a few pounds or free spins, but you can win real money
- Sites offering these usually don't require any codes for the bonus but you will need to register an account
- These are for existing players and reward you for making more deposits by percentage, matching your deposit amount or giving free spins
- Most sites offer these for depositing on certain days or for special promotions
- Claiming these bonuses might require a specific code or clicking on a link from an email or social media
- As the name implies, these are spins on real money slot games for free
- Some casinos dictate the game or developer for use with the promotions
- This online casino promotion is usually tied to your account and won't require any codes
- Some casinos offer a loyalty program to reward frequent players using points for every time you play or deposit. Points can be redeemed for cash or free play
- Extra benefits can include prize draws, luxury travel and even bespoke gifts
- Casinos will automatically enrol you in their loyalty program, so there's nothing extra you'll need to do to start earning rewards
Refer a Friend
- As the name implies, you'll get rewarded when you refer a friend to your preferred online casino
- Most sites will pay out a set bonus when your friend signs up and makes a first deposit
- To claim this bonus, your friend will need to use a specific link you give them, or your personalised referral code
Online casino bonuses make you a winner before your first hand or spin of the reels.
How We Find the Best Casino Bonuses
One of the main benefits of playing at an online casino is that the site will make it worth your while. Just in case endless fun and huge prizes aren't enough, you can get rewarded before you take your virtual seat by claiming a real money online casino bonus.
Since nearly every UK casino site offers some sort of cash incentive, it's important to weigh the quality of the site as much as the online casino bonus itself. When you play at the best casino online, bonus elements will also be the best. We've assessed and reviewed every worthwhile casino in Britain. Our ratings are based on a range of elements, including:
- Licensing and fairness – All recommended sites are fully certified and trustworthy
- Bonuses – We check the bonuses to ensure that they are truly beneficial and offer players great value
- Banking options – Sites need to offer a range of fast deposit and withdrawal methods
- Customer service – Whether it's a question or concern, all these sites work hard to resolve them efficiently
Expand your bankroll with extra play money
Try new sites without risk with an online casino no deposit bonus
Discover great new slots with free spins
Get rewarded when you play with friends
Extra payouts for loyal and high roller players
Claim Your Bonuses on Mobile
Using a smartphone and tablet to play online casino games is a ton of fun and totally freeing, plus you can still claim all the best promotions. Sign up on mobile with an online casino. Free bonus no deposit options are waiting for you, all with the tap and swipe of your fingertips.
If you play at the best casino online, bonus options can be expanded for mobile users, giving you even more reasons to play from your handheld device. Whether you claim a specific bonus for mobile users, or you simply use your smartphone to get a welcome bonus, you can enjoy the best online casino promotion on the go or at home from the palm of your hand.
Enjoy a Massive Range of Games
While there's no denying that you deserve the best bonus, online casino sites give you more than just free cash. They also give you access to all your favourite games. You can use your various bonuses to play:
- Hundreds of authentic slot machines
- Wide varieties of blackjack, roulette and poker
- Bingo and keno
- Baccarat, craps, and sic bo
- Live dealer games
The UK's Top Games & Bonuses for May 2021
Free GamesView Full Library of Free Games
1050 Games Match Your Preferences
5 Reasons Why Players Rate Us as Number 1
Gamblers of all skill levels from across the United Kingdom count on us for valuable UK-based casino reviews. That's because we're different from your average review site. If you're looking for reliable sites with massive online casino bonuses, you can rely on our gambling specialists to light the way with objective and thorough reviews. Discover how we help you get the most out of every game.
1 Reviews You Can Trust
Players from all over the UK rely on our team of gambling experts for comprehensive and insightful casino reviews.
2 Fair & Independent
Since we aren't associated with any of casinos we review, all the information we provide is objective and honest.
3 Safe & Certified Sites
For your safety, we only review and recommend sites that are licensed by the UK Gambling Commission.
4 Top Bonuses & Perks
Find some of the best online casino bonus offers, promos and rewards. We'll help you find the most lucrative promotions.
5 Blacklisting Bad Casinos
Don't jump at the first bonus you see. Consult our blacklist and learn which casino site to avoid.
There are so many reasons to only play at the best sites, but one of the most rewarding is an impressive online casino promotion. Whether you're looking for a lucrative welcome bonus, rewarding loyalty program or excellent free spins, we've got you covered. These are the best bonuses for UK players at the top casinos online in 2021.
Avoid These Blacklisted Sites
Let's cut right to the chase. These sites are the worst online casinos in 2021 and we urge all players in the UK to avoid them.
Cool Cat Casino
- Very slow payments
- Unresponsive support
- Unreliable promotions
- Payment Issues
- Shady practices
- Unfair promotions
- Not delivering on promos
- Poor business practices
- Slow communication
Frequently Asked Questions
How do deposit bonuses work?
When you claim a deposit bonus, you'll get extra cash on top of the money you add to your bankroll. For example, you might find a 100% deposit bonus that will double the amount of your initial deposit. Find out more in our guide to how bonuses work.
Can I cash out my bonus?
While bonuses are effectively free money, you can't withdraw your complimentary cash immediately. At an online casino, UK players must satisfy wagering requirements before cashing out. In other words, you'll need to play a set number of games first.
Do I have to be a new player to claim a bonus?
Although welcome bonuses are generally reserved for new players, the free cash doesn't have to end after your first deposit at an online casino. UK casino fans can take advantage of reload bonuses, promotions and loyalty rewards.
Can I claim bonuses on my smartphone or tablet?
It doesn't make a difference how you choose to access online casinos. UK sites give you a casino bonus on any iPad, iPhone, Windows Phone, Microsoft Surface, Android tablet or smartphone.
How do I find a great site with a big bonus?
Our gambling experts have tested and compared the best licensed gambling sites in the UK. If you're ready to claim free cash from a fantastic casino just visit any of the top-rated sites we've listed on this page.
What types of bonuses are there?
There are numerous types of online casino bonuses, like welcome bonuses that match your first deposits and loyalty programmes that reward you for playing and depositing funds. You can even get free spins or extra payouts when you refer a friend.
Are bonuses worth it?
Most of the time, bonuses add extra value for players although the terms and conditions can be confusing. That's why we explain them in our reviews and blacklist sites that don't live up to the online casino promotion.
How long does it take to claim a bonus?
Most bonuses will be claimed instantly, but computer systems and checks can mean that you'll need to wait 5-10 minutes for free spins or bonus money to appear on your account. If it takes longer than that, it's best to contact customer support.
What are bonus codes?
While some bonuses are allocated to your account automatically, others need to be claimed with a specific code. This will be given to you on a website, or via email or social media. Simply provide the code when making your deposit, and you will claim the bonus.
MansionRanked #1 out of 53 UK online casinos
18+ only, New customers only. Min deposit £20, Maximum Bonus £ 200, wager 40x before withdrawal. Game weighting applies. Bonus betting restrictions: slots - £5, all other games – 10% of bonus amount. T&Cs apply.
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