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　　Helping our visitors find top online casinos is one of the main missions of Casino Guru. Having reviewed over 7,000 real money casino sites – literally every single casino site we've been able to find – we know what to look for when deciding which gambling site deserves to be called one of the best online casinos in May 2025.

　　In this part of the page, you can read about how we review online casinos, our casino review team, how to use Casino Guru to find the best casino for you, and much more.

　　We meticulously and methodically review each casino site listed on our website – whether it is one of the top 10 online casinos or one of the worst ones – with a focus on fairness and safety.

　　We consider these the most important factors influencing the quality of online casinos, because we believe that players should be able to play real money online casino games and withdraw their winnings without experiencing issues like blocked accounts or declined withdrawals. That's what top online casino sites can offer and bad ones cannot.

　　That's why you see the Safety Index displayed next to each casino listed above. This is our safety score, which we calculate for all online casinos we review. It is based on a number of factors, such as:

　　Fairness of Terms and Conditions – We carefully read and evaluate each clause listed in each casino's T&Cs to uncover potentially unfair, misleading, or questionable rules. Such rules can potentially be used against players in a way we consider unfair, so the casino's Safety Index is lowered for each unfair clause. We also lower the Safety Index of casinos that do not have any General T&Cs at all, as the lack of publicly available rules makes it difficult for players to know what is and what is not allowed.

　　Casino size – We believe that bigger real money casinos are, in general, safer for players. This is because their size is a sign of quality and stability, allowing them to pay out big wins without running into financial difficulties. We have seen many cases of smaller casinos struggling to pay out players who managed to win big. This is why the known or estimated size of each casino is a factor contributing to its Safety Index.

　　Player complaints – Complaints submitted to our Complaints Resolution Center or collected from other sources tell us a lot about how a casino treats its players, as well as what kinds of issues they face while playing. We thoroughly consider each complaint and decrease a casino's Safety Index for each justified complaint that has not been resolved by the casino. Complaints are considered in proportion with a casino's size, as bigger casinos are expected to receive more of them.

　　Casino blacklists – There are several websites that publish a blacklist of online casinos, including our own Casino Guru blacklist. If a casino appears on a blacklist, it can be an indicator of its negative qualities. We take a look at each listing and decrease the Safety Index of blacklisted casinos according to the reasoning behind it and our evaluation. Top 10 online casinos should not appear on any blacklists.

　　Basically, we look for anything that could make your online casino experience unsafe or less enjoyable. The higher the Safety Index, the more likely you are to be able to enjoy real money online casino games and be able to cash out your winnings from the casino without running into issues which might be common at online casinos with a low Safety Index.

　　Our in-depth casino reviews and recommendations would not be possible without the hard work of our independent casino review team. It is this team's sole responsibility to learn everything there is to know about each casino site they review.

　　We use the information collected by the review team to calculate each casino's Safety Index, which allows us to recommend safe online casinos to our visitors.

　　It is part of Casino Guru's mission to review and rate all available real money online casinos. We do that by consistently looking for new casino sites and doing a detailed review of every single online casino we discover. Thanks to this, we can consider all available casinos and select the best ones when creating and updating this list of best online casinos.

　　As you can imagine, this takes a lot of hard work. We currently have more than 6,000 online casinos in our database, all of which have been through our methodical process that evaluates the casino's qualities, with a focus on fairness and player safety. We add tens or hundreds of new casinos to our database and continuously revisit existing ones to keep our information up to date.

　　All of this is done by a dedicated team of more than 15 casino specialists led by Matej Novota, who has been part of the Casino Guru team basically since the beginning and has helped set up and fine-tune our casino review methodology.

　　Matej and the rest of the team go truly in-depth with each online casino they evaluate. They check each casino's website, thoroughly read the Terms and Conditions to uncover and unfair rules, evaluate player complaints, check licenses and company information, and go through countless other steps required to learn everything we need to know to evaluate an online casino and decide whether we are going to recommend it to our visitors or not. Based on this, we calculate each casino's Safety Index and decide which online casinos to recommend and which not to recommend.

　　As already mentioned, we are constantly on the lookout for newly opened online casinos. On top of that, we periodically update our existing reviews, so that we keep providing up-to-date information to our visitors. In the table below, you can see an overview of what has changed in the last few weeks.

　　From

　　To

　　New casinos added and reviewed

　　Existing reviews updated

　　Safety Index increased by 0.5 or more

　　Safety Index decreased by 0.5 or more

　　April 14

　　April 20

　　33

　　150

　　21

　　70

　　April 21

　　April 27

　　36

　　153

　　324

　　179

　　April 28

　　May 4

　　32

　　119

　　42

　　63

　　May 5

　　May 11

　　43

　　118

　　79

　　55

　　May 12

　　May 18

　　40

　　119

　　169

　　94

　　Table with numbers of casinos added or updated in the last five weeks

　　On top of our expert evaluation of each online casino you can find on this page, you can also take a look at the user feedback scores when selecting a casino to play at.

　　Members of the Casino Guru community can submit their own reviews of online casinos, rating them on a scale from 1 to 5. Based on the submitted user reviews, we calculate an overall User feedback score that ranges from Terrible to Excellent.

　　Reviews from other casino players can be a great resource when selecting the best online casino for you. They can give you an insight into what other players experience while playing, including any positive aspects or significant issues they have encountered.

　　With more than 6,000 real money online casinos in our database and the gambling market steadily growing according to Statista.com, casino players from many regions are spoilt for choice. Competition between casinos is, of course, generally good for players, but the sheer number of them can make it difficult to choose the best option. So, how do you find the best online casino for you?

　　You can start your search by checking out the list of top online casinos above. Based on our expert recommendations, the best casino sites are located at the top of the list. These have received the approval from our in-house expert review team and will be a good fit for most players. However, if you're after something specific, we suggest using our filters to tailor the results to your preferences and find the ideal match for you.

　　Above the first listed casino, you can see four tabs that can also assist you in your search. These are quick shortcuts to different lists of top online casinos, which you may be interested in:

　　Recommended – This tab is displayed by default when you first open this page. According to the reviews and insights of our expert team, the casinos listed in this tab are the top options, and we highly recommend selecting one of the sites from this list of the best online casinos in May 2025 to ensure a safe and enjoyable gambling experience.

　　Newly opened – If you are looking for new online casinos, this tab is for you. However, keep in mind that we cannot fully vouch for these, as they don't have the history needed for us to fully evaluate their qualities. Still, pay attention to our Safety Index and approach new casinos with caution.

　　Big brands – If you are looking for the absolute safest options, the biggest online casinos may be the best bet for you. These are the biggest corporations on the gambling market, which means they can afford to pay out the biggest wins and have a reputation to protect.

　　All casinos – If you wish to browse our online casino database without any limitations, this option is for you.

　　On top of the tabs listed above, we have an advanced system of sorts and filters, which will allow you to fine-tune your search for the best online casino with real money games. In this part of the article, we will give you an overview of how to use the sorts and filters on our casino list to find the best option for you.

　　No matter which tab you're in, you can see several sorting options available. These let you reorder the list of online casinos based on different criteria. For example, if you wish to see the best online casino sites at the top of the list, select the 'Recommended' sort.

　　Other sorts that you can apply to change the order of the casinos include 'Recently opened,' 'Recently added,' or 'Highest Safety Index.'

　　As we've mentioned in the previous section, we've also designed a broad selection of useful filters that you can use to narrow down the top online casino options based on your specific requirements. Here's an overview of some of the filters available:

　　Bitcoin and crypto friendly casinos – Online gambling with cryptocurrencies is getting more and more popular. If you wish to find top casinos online that allow you to make a deposit and play directly with crypto funds, use this filter to find them.

　　Live dealer online casinos – Real money casino games with a live dealer allow players to watch and interact with live dealers, resulting in an experience similar to land-based casinos.

　　High roller online casinos – If you plan to gamble with larger amounts of money, it is important to choose an established casino with a good track record, so that your funds are safe.

　　Types of casino games – Use to find casinos with slots, casinos with roulette, or any other games you like to play.

　　Game provider – If you are looking for top casinos with games from a specific provider, such as Evolution Gaming casinos or Playtech casinos, use this filter.

　　User reviews – Use to only browse casinos with a good User feedback score calculated based on reviews submitted by players.

　　Payment method – Helpful especially if you are looking for casinos with a local payment method, such as BankID, Interac, or Swish.

　　Licensing authority – If you are looking for casinos with a specific or local license, such as Malta Gaming Authority or Kahnawake Gaming Commission.

　　Currency – If you are looking to gamble in a specific currency, use this filter to make sure that the casino of your choice supports it.

　　Languages – If you would like to play at a casino that supports a specific language, you can use our filters and find casinos with a website, customer support, or live chat in your preferred language.

　　Casino Guru's popular filters to help you find the best casino

　　If you are looking for an even easier way of choosing the right casino for you, you can use our casino selection helper tool linked above, just under the list of best online casinos itself.

　　By answering three simple and quick questions related to bonuses, games, and age of online casinos you prefer, you will be presented with three top casinos that meet your criteria. Then it is just a matter of selecting the one that looks best to you or going back to the list if you realize that you would like to see more options after all.

　　Whichever of the displayed top casinos you choose, you will find a casino that treats players well and is recommended by our casino experts. Each of them has a unique feature or advantage listed in the tool to make your final decision easier.

　　For now, we have focused on finding the best casino to play at. However, it is just as important to know which real money casino sites you should definitely avoid, as playing at a slightly subpar site is still much better than playing at one that is likely to use unfair practices or even outright scam you.

　　First-and-foremost, you should take a look at our casino blacklist. If a casino appears on it, it must have done something especially serious that goes against the principles of fair and safe gambling. This is a clear sign you should stay away from it and choose a different one instead.

　　Casino sites or companies running them can be listed on a blacklist for a multitude of reasons, ranging from potentially tolerable reasons to undeniably unacceptable ones. If you take a look at our blacklist, you will find a range of issues we discovered:

　　Scam casino – We use this term to describe sites that pretend to be a regular online casino but are actively trying to scam players by demanding payments to unlock their winnings. They often use names similar to those of well-known casino brands to create a fake sense of trust.

　　Extremely unfair terms – As we read the Terms and Conditions of all online casinos we review, we often discover unfair rules. However, casinos listed on our blacklist because of this reason have gone one step further and their T&Cs fall outside of the common unfair ones.

　　Payment issues – Delayed payments and other payment-related complications are pretty common in online casinos, but some of them consistently struggle or knowingly avoid paying out winnings to players.

　　Additionally, take a look at the casino's Safety Index here on Casino Guru – our metric for evaluating the fairness and safety of online casinos. It is a good idea to avoid playing at casinos with a Low or Very low Safety Index.

　　If you'd like to register and start playing at a real money online casino, the process is usually pretty straightforward, although it tends to differ from casino to casino. In general, here are the steps you should follow at most casino sites:

　　Select your preferred online casino from the list on this page – Find the best option for your preferences by following the advice stated above and using our series of filters and sorting tools. In case you would like to know more details about a particular casino, head to its review by clicking 'Read Review.' It should contain all the information you might find useful in making an informed decision.

　　Click on the 'Visit Casino' button – You will be taken directly to the casino's website.

　　Create a casino account – Once you're on the casino website, you will need to click on a button that will open a registration form. Complete all the required details – you must enter only truthful and correct personal information – and follow the rest of the registration steps.

　　Verify your e-mail or phone number – Most casinos will send you a verification e-mail or text message to make sure you entered correct contact information.

　　Make a deposit – Unless you receive a no deposit bonus from the casino, you will have to deposit real money into your casino account to be able to start playing. Proceed to the Cashier section of the casino, choose your preferred payment method, and go through the steps to fund your casino account.

　　Start playing – Once all of the steps above are completed, you will be ready to start playing. Play your favorite casino games or explore new ones, but make sure to gamble responsibly.

　　Cashing out money from your casino account is usually pretty straightforward, perhaps with the exception of your first withdrawal. This is because many casinos start the KYC process when they receive your first withdrawal request. If that happens, cooperate with the casino and submit the required documents for verification.

　　Most commonly, you will be able to withdraw funds using the payment method you also used to make a deposit. For example, if you deposited using your Mastercard, your withdrawal will be processed using the same card.

　　However, you may come across some exceptions. For example, the payment method that you used to make a deposit may not be supported for withdrawals. In such a situation, you will likely be required to verify an alternative payment method. Online casinos do this to ensure that the payment method truly belongs to you.

　　The withdrawal process is generally very similar to making a deposit. To request a withdrawal, you usually have to go to the Cashier section on the website of the casino. Once there, find the withdrawal section, enter the amount you wish to withdraw, and confirm the request. Some online casinos may ask you to enter your password, but as long as your account and payment method are already verified, that should be all.

　　The selection of slots and other types of real money casino games is an important factor to consider when selecting a casino to play at. After all, gambling should first and foremost be fun, and the games we play at online casinos greatly influence this aspect.

　　Luckily, many modern online casino sites have vast libraries of casino games on offer, ranging from slots, through table games like blackjack or roulette, to less frequent options like crash games or keno.

　　Here is an overview of the most common and popular types of casino games:

　　Slots – Undoubtedly the number one most popular option, slots are easy to play and come in all shapes and sizes. You can find hundreds or even thousands of titles at top online casinos, with all the features, bonus rounds, free spins, and anything else you can imagine.

　　Roulette – Greatly popular in land-based casinos, roulette is also a player favorite in online casinos. Available in computer-generated and live dealer versions, you can enjoy this simple casino game in most online casinos.

　　Blackjack – In blackjack, you need to beat the dealer to win. You do this by getting closer to the sum of 21 than the dealer, without going over. Blackjack requires some know-how to minimize the casino's advantage, so we do not recommend it to beginners.

　　Baccarat – Simple card game, in which you bet on the banker to win, the player to win, or a tie. The game seems quite complex, but as all the rules are set, so you generally do not need to make any further decisions after placing your bet. Just stay away from betting on a tie, as it has the highest house edge.

　　Video poker – A popular casino game that combines elements of poker and slot machines. It is based on traditional poker gameplay, in which you have to try to form the best hand possible. However, unlike classic poker, you play against a virtual machine rather than real opponents.

　　Scratch cards – In this simple game of chance, you have to scratch off a surface of a card to reveal hidden symbols. You usually win a prize if you match three of the same symbols, but the rules can vary. Traditional physical scratch cards probably came to your mind first, but there are also many online versions available.

　　Live dealer games – To bring the brick-and-mortar experience online, casinos started offering live dealer games that are streamed from a studio with a real person in charge of the gameplay. You can play table games with a live dealer, as well as intricate game shows.

　　Jackpot games – Some games come with a progressive jackpot that grows over time until a lucky player wins it. These can result in extremely high wins in some cases, but you should keep in mind that winning the jackpot is extremely unlikely.

　　As you can see, you should be able to find enjoyable games at any of the top-rated casinos listed above. The types of available games are listed right next to each casino, and information about game providers is available in each casino's review.

　　If your preferences are specific, you can use our filters to limit the selection of displayed casino sites in the list to those that offer a certain type of casino games (such as slots or roulette) or games from a specific game provider (such as Pragmatic Play, NetEnt, or many others).

　　If you are new to online casinos, it is important you know how real money casino games work when playing online. Slots, roulette, blackjack, and other popular types of games each have their own specifics, but there is one underlying aspect they have in common – the casino has an edge.

　　Casino games are configured to give the casino an advantage (also known as house edge), which ensures that casinos stay profitable in the long run. You can still win; however, over a long period of time and with a large number of players, the casino will almost certainly be profitable. In short, you are virtually always playing at a disadvantage.

　　There are two main mathematical characteristics of any real money casino game:

　　Return to player (RTP) – The percentage of wagered funds you can expect to get back from the casino in the form of wins. Of course, your short-term results can vary greatly, but the long-term results should be more or less in line with the RTP. For example, European Roulette has an RTP of 97.3%, which means you statistically lose 2.7% of each bet. The 2.7% is the house edge of European Roulette.

　　Volatility – Also known as variance, it describes the frequency and size of individual wins. Low volatility games or bets tend to pay out smaller wins more often, whereas high volatility ones can pay out big wins, but they tend to be quite rare.

　　We believe that knowing this will help you make better decisions when it comes to casino games, as it doesn't give you unrealistic expectations of winning money on a long-term basis. And, as we always say, gambling at online casinos should be about having fun, not about making money.

　　Watch our video explaining how casino games of chance work

　　While we focus mainly on real money online casinos, there are other types of gambling available online. There are gambling sites that focus on sports betting, poker, and other gambling genres that are not necessarily played against the house, like traditional casino games are.

　　Many casino sites combine multiple types of gambling together, resulting in a website with an offering suitable for a wide audience. Also, some players prefer playing casino games for free, without the risk of losing any money.

　　Many players are interested in online casino bonuses, as they provide them with something extra alongside their real money deposit or even allow them to play for free. If this is also your case, you can find a bonus offer listed next to most of the top online casinos above.

　　The most common casino bonuses are probably welcome or sign-up bonuses, also known as bonuses for new players. These promotions are intended to encourage players to set up an account at a new casino and start playing there for real money. Typically, they come in two forms – no deposit bonuses and deposit bonuses.

　　No deposit bonuses are especially popular among players, as they let them try a new casino site without the need to make a deposit and risk their own money. Deposit bonuses, on the other hand, are more widespread and give players extra funds or free spins after making their first deposit.

　　If you want to learn more about the bonuses offered by any of the casinos on our list, click 'Read review' and proceed to the 'Bonuses' section of our review. There, you'll find all the available bonuses offered by that casino, together with their Terms and Conditions, which will help you choose the best offer for you.

　　Alternatively, if bonuses are your main priority, it might be better for you to proceed to our list of casino bonuses and browse offers from all online casinos. If you're looking for something more specific, you can refine your search using our selection of filters.

　　Playing real money casino games online can be fun, but it can also have a negative impact on people's lives. Besides the possibility of losing money, gambling addiction can be extremely dangerous, which emphasizes the importance of safer and responsible gambling, such as setting a budget and limits in advance, as well as looking for help if you gambling habits start getting out of hand.

　　Our responsible gambling section contains a plethora of information on the topic, allowing you to stay informed on how to gamble safely, where to look for help if needed, and many other topics. If you feel like you are at risk, don't hesitate to talk to a professional.

　　Here are some quick safer gambling tips taken from our safer gambling article:

　　Always see gambling as a form of entertainment, not as a way of making money

　　Never chase your losses

　　Remember that you are always playing at a disadvantage against a casino

　　Set a gambling budget and stick to it

　　Use responsible gambling tools like deposit limits, loss limits, etc.

　　Never gamble while depressed, anxious, or generally in a bad state of mind

　　Never gamble while under the influence of alcohol or drugs