reCAPTCHA v3 is a bot detection solution developed by Google. It aims to protect websites and applications from bots and automated abuse. reCAPTCHA v3 determines a risk score for each request based on a variety of personal information and data. Based on this risk score, site administrators will need to take the appropriate steps to protect the site from suspected bots.

This guide explores the features and limitations of Google reCAPTCHA v3. We’ll examine the intricacies of reCAPTCHA v3’s integration process. We will also look at the future of bot protection, reviewing emerging user-friendly CAPTCHA technologies and strategies that promise to improve online security.

reCAPTCHA v3

Guide to Google reCAPTCHA v3

How Google reCAPTCHA v3 Works

reCAPTCHA v3, also known as Invisible reCAPTCHA, was developed utilizing a signal-based method that aims to operate in the background without requiring user interaction.

Based on the analysis of user data, reCAPTCHA v3 determines whether an activity resembles human behavior and good interaction, or suspicious users and abusive traffic. To do this, Google collects and stores a variety of personal information from users on an ongoing basis, along with using reCAPTCHA cookies. This includes monitoring user interactions on websites, such as mouse movements, clicks, scrolling patterns, typing speed, and screenshots of open web pages.

At the heart of reCAPTCHA v3’s functionality is the reCAPTCHA score, a numerical value between 0.0 and 1.0. The risk score indicates a user to be likely a bot or human. A score closer to 1.0 indicates that the user is likely a human. A reCAPTCHA v3 score closer to 0.0 indicates possible bot activity.

reCAPTCHA v3 returns this score to site administrators. They must then take an appropriate action in the context of the site. The reCAPTCHA admin console provides a basic breakdown of data for the top ten actions, including action names and scores.

Users with a high reCAPTCHA score (an indication of human behavior) could be granted immediate access. Users with lower scores (an indication of fraudulent behavior) could be blocked immediately or alternatively required to take additional steps to verify they are human. This could include email verification or solving a traditional image CAPTCHA involving clicking on cars or traffic lights.

Features and Benefits of reCAPTCHA v3

  • Bot protection: reCAPTCHA v3 is used by companies around the world. It is a common method to protect a website from bots. However, the security capabilities of reCAPTCHA v3 should be compared to reCAPTCHA alternatives, as it only provides basic protection against simple bots. With the rise of machine learning and more sophisticated bots, reCAPTCHA v3 is reaching its limits. These bots are getting better at mimicking human behavior and human signals. reCAPTCHA v3’s signal-based analysis is not always able to clearly distinguish between humans and bots, resulting in in-between cases that require manual user tasks as a fallback.

  • Improved usability: reCAPTCHA v3 provides an invisible version without image recognition tasks to perform an initial risk assessment. Once a user’s behavior is classified as unusual, additional fallback tests are required to be solved by the user. The well-known traditional “I’m not a robot” test is often used as a fallback, but its image recognition tasks are far from being an accessible CAPTCHA or being WCAG-compliant.

  • Flexible risk management: reCAPTCHA v3’s risk scoring system allows for flexible risk management. Site administrators can customize the response based on the reCAPTCHA v3 risk score. While this customization allows for some flexibility, it can also be a challenge for site owners. Using the reCAPTCHA v3 score to make a binary decision to either completely block or allow a user results in a high false positive rate, leading to the exclusion of legitimate users from web forms.

Fallback image recognition task

Limitations of reCAPTCHA v3

  • Privacy compliance: reCAPTCHA v3 collects various personally identifiable information and analyzes detailed user interactions, such as the user’s IP address or a full screenshot of the browser window.

    Privacy experts are critical of reCAPTCHA v3’s GDPR compliance. Because Google reCAPTCHA v3 collects user data extensively, uses cookies and persistent browser storage, it raises privacy concerns among regulators and users alike. There is a lack of transparency around reCAPTCHA v3’s collection, storage and use of user data, which can lead to reputational damage and potential non-compliance with strict privacy regulations such as GDPR and CCPA.

    Websites that reach European users must comply with additional GDPR requirements: For example, European users’ personal data cannot be shared with U.S. companies like Google without additional safeguards.

  • Accessibility issues: reCAPTCHA v3 can misinterpret atypical user behavior as suspicious bot activity, either blocking real users entirely or requiring them to solve inaccessible image recognition challenges.

    Users with disabilities find it difficult to interact with sites protected by reCAPTCHA v3 because it typically uses traditional image recognition as a fallback.

    These visual challenges are difficult to overcome and exclude people with visual impairments, the elderly, and those using accessibility tools such as screen readers. False positives – where legitimate users are mistakenly identified as bots – can disrupt the user experience and deter genuine humans.

  • Usability issues: reCAPTCHA v3 works in the background most of the time. However, when it detects suspicious activity, it requires a fallback to manual tasks, such as reCAPTCHA’s image recognition tasks that must be solved by hand. These tests can be nerve-wracking and time-consuming, resulting in higher bounce rates and lower conversion rates.

    When risk signals can’t be captured due to privacy-conscious user behavior, reCAPTCHA v3’s bot protection is only partially successful. This results in a high rate of false positives and the exclusion of real users.

    Cautious users are more likely to solve additional image recognition CAPTCHAs manually. This is especially true for users who are privacy-conscious, use a tracking blocker or VPN, or are not signed in to Google.

  • Complexity of integration: While the initial integration steps of reCAPTCHA v3 are typically straightforward, the final steps in the reCAPTCHA v3 integration process often require detailed configuration and fine-tuning to ensure that it works correctly.

    Additional attention is required due to reCAPTCHA v3’s use of cookies. To comply with GDPR and CCPA, website operators must obtain prior consent from their users for the use of reCAPTCHA v3 cookies. If users do not provide the required consent, they will not be allowed to load reCAPTCHA v3. This effectively excludes those users from any web interactions protected by reCAPTCHA v3.

Common Use Cases for Google reCAPTCHA v3

Google reCAPTCHA v3 aims to differentiate between real users and bots based on user behavior. reCAPTCHA v3 can be used to protect web interactions such as logins, account creation, password reset, payment authorization, and online forms.

The following online threats can be protected with reCAPTCHA v3:

  • Bot protection and defense against automated attacks: Bots cripple entire industries through spam, content scraping, fake reviews, account takeovers, and automated resource abuse. reCAPTCHA v3 can reduce the threats posed by bots.

  • Account takeover prevention: Account takeovers are a constant risk in the digital world. Organizations must protect their web interactions, such as logging in, registering, and completing online forms. reCAPTCHA v3 is a common measure to prevent account takeover.

  • Fake account creation: Fake accounts are used to spread spam, abuse, fraud, and misinformation online. Bad actors create false identities on digital platforms, leading to serious consequences for businesses. Fake accounts can manipulate online surveys or reviews, spread misinformation, and conduct corporate espionage.

  • SMS toll fraud and SMS pumping attacks: SMS toll fraud or SMS pumping involves attackers using bots to send bulk messages to service numbers. This cyberattack disrupts the organization’s device or network. reCAPTCHA v3 aims to prevent SMS pumping.

  • Fraudulent transaction protection: Fraudulent transactions often involve the illegal use of sensitive user data in the financial and digital environment. Card and payment fraud involving stolen credit card data causes significant financial loss and damage to customer confidence every year.

Steps to Implement reCAPTCHA v3

Implementing reCAPTCHA v3 involves a few essential steps that require specific technical prerequisites and skills. First, make sure that your website is live and has a functioning server backend, as reCAPTCHA v3 relies on server-side verification to process user interaction.

You should also gather the necessary skills and tools to implement it. You will need at least a basic understanding of HTML and server-side programming languages such as PHP, Python, or JavaScript. These skills are essential for embedding the reCAPTCHA v3 script into your web pages and performing the server-side verification process.

1. Registering for Google reCAPTCHA v3 and Obtaining a Site Key

First register your site and obtain the necessary keys. The process starts with creating a Google account if you do not already have one. A Google account is essential to access the Google Developer Console, which is where you’ll manage your reCAPTCHA settings.

Navigate to the reCAPTCHA website and sign up using your Google credentials. After signing in, you’ll be directed to the Google reCAPTCHA admin console. Here, you need to register a new site by selecting the option for reCAPTCHA v3. During this registration process, you’ll be prompted to enter your site’s domain, which is necessary for generating the site key and secret key.

Upon completing the registration, Google will provide the keys for authorization in the reCAPTCHA admin console. The site key is used on the frontend of your website to integrate reCAPTCHA, while the secret key is utilized on the server side for verification purposes. It is essential to keep the secret key secure, as it is integral to the functionality and security of reCAPTCHA on your site.

2. reCAPTCHA v3 Integration

When implementing reCAPTCHA v3 with your site, you’ll need to address both frontend and backend integration components. Here’s a detailed guide on how to handle each part of the integration process.

Frontend Integration of reCAPTCHA v3

The first step in frontend integration is to include the reCAPTCHA v3 script in your HTML. You can do this by adding the following line to the <head> section of your HTML document. Replace reCAPTCHA_site_key with the site key you obtained during the registration process. This script is essential for reCAPTCHA to ensure the functionality on your website.

				
					<script src="https://www.google.com/recaptcha/api.js?render=reCAPTCHA_site_key"></script>
				
			

You must configure the client-side code after adding the reCAPTCHA script. This involves automatically binding reCAPTCHA to a button or calling it programmatically.

To automatically bind the challenge to a button, you have to define a function that handles the CAPTCHA response once it’s completed:

				
					 <script>
   function onSubmit(token) {
     document.getElementById("demo-form").submit();
   }
 </script>
				
			

Now add some attributes to the button to let reCAPTCHA v3 automatically bind to it:

				
					<button class="g-recaptcha" 
        data-sitekey="reCAPTCHA_site_key" 
        data-callback='onSubmit' 
        data-action='submit'>Submit</button>
				
			

If you prefer to call reCAPTCHA v3 programmatically, you can call the grecaptcha.execute() method based on certain user actions, such as form submissions:

				
					<script>
      function onClick(e) {
        e.preventDefault();
        grecaptcha.ready(function() {
          grecaptcha.execute('reCAPTCHA_site_key', {action: 'submit'}).then(function(token) {
              // Add your logic to submit to your backend server here.
          });
        });
      }
  </script>
				
			

For user transparency, it’s important to place the Invisible reCAPTCHA v3 badge on your site. The badge informs users that your site is protected by reCAPTCHA v3. You can add it to your site by including the reCAPTCHA code where you want the badge to appear. Alternatively, you can use CSS to adjust the position of the badge to better fit your site’s design.

Backend Integration of reCAPTCHA v3

Once you receive the reCAPTCHA v3 token from the frontend, you need to verify it on your server. Here’s how to do this in several popular languages:

  • Example in Node.js:

				
					const verifyRecaptcha = async (token) => {
    const secretKey = '[YOUR SECRET KEY]';
    const url = `https://www.google.com/recaptcha/api/siteverify?secret=${secretKey}&response=${token}`;

    const response = await fetch(url, {method: "POST"})
        .then(r => r.json());
    return response;
};
				
			

 

  • Example in PHP:

				
					function verifyRecaptcha($token) {
    $secretKey = '[YOUR SECRET KEY]';

    $url = 'https://www.google.com/recaptcha/api/siteverify';
    $data = [
        'secret'   => $secretKey,
        'response' => $token
    ];
                 
    $options = [
        'http' => [
            'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
            'method'  => 'POST',
            'content' => http_build_query($data) 
        ]
    ];
    
    $context  = stream_context_create($options);
    $result = file_get_contents($url, false, $context);
    return json_decode($result);
}
				
			

After you verify the CAPTCHA response, you receive a response that includes a risk score. Use this score to make security decisions and set your own score threshold. By running appropriate action based on the risk score, you can try to balance security and user experience. A threshold of 0.5 acts as a good default:

				
					if (response.success && response.score >= 0.5) {
    // Treat as human and proceed with the request
} else {
    // Treat as bot and take appropriate action
}
				
			

Through a dedicated reCAPTCHA module and plugin, reCAPTCHA v3 can be integrated with various frameworks and CMS platforms. Here are some examples:

  • WordPress: Many WordPress form builder plugins offer support for reCAPTCHA v3. If you aren’t using one of these form builder plugins, you can use the “reCaptcha by BestWebSoft” plugin to add support for reCAPTCHA v3.

  • Joomla: The “reCaptcha Invisible” plugin allows integration with Joomla sites.

  • Other Frameworks: There are packages for many other frameworks such as Django, Ruby on Rails, and Laravel that integrate reCAPTCHA v3.

3. Testing and Validation after Google reCAPTCHA Implementation

It is important to perform thorough testing and validation to ensure that Google reCAPTCHA v3 is working properly. This includes several tasks to verify that reCAPTCHA v3 is active, effective, and not causing unintended problems for human users.

For initial testing, verify that reCAPTCHA v3 is active by checking for the presence of the reCAPTCHA v3 badge on your site. The badge typically appears in the lower right corner of the screen, indicating that reCAPTCHA v3 is running in the background.

Visit your site and navigate through different pages to ensure that the badge appears consistently. In addition, use your browser’s developer tools to inspect the HTML and confirm that the reCAPTCHA v3 script is properly included and loaded.

Next, visit the Google reCAPTCHA admin console to monitor the performance and effectiveness of reCAPTCHA v3. Access the Google reCAPTCHA admin console using your Google Account and explore the dashboard.

The reCAPTCHA admin console provides insights into the successes and failures of reCAPTCHA CAPTCHA challenges. In the reCAPTCHA admin console, there is a break down of action names and action data for the top ten actions.

Choose your score threshold according to the action name and find a variable action. Be careful to choose the right score threshold to avoid locking out real users, while also blocking harmful bots. Balancing this black-and-white decision is a tricky – and often impossible – task to avoid usability and accessibility issues.

During testing, you may encounter common error messages. Understanding and troubleshooting them is covered here. Addressing these errors promptly will help maintain the effectiveness and reliability of reCAPTCHA v3 on your site.

  • “timeout-or-duplicate”: This error occurs when the reCAPTCHA v3 token is used more than once or has expired. Make sure each token is used only once and is valid at the time of verification.

  • “missing-input-secret”: The secret parameter is missing. Make sure you are sending the secret key correctly in your verification request.

  • “invalid-input-secret”: The secret parameter is invalid or malformed. Check that the secret key is correctly copied and configured.

  • “missing-input-response”: The response parameter is missing. Make sure the token is correctly sent from the frontend to your server.

  • “invalid-input-response”: The response parameter is invalid or malformed. Verify that the token received from the client side is properly formatted.

Thorough testing and validation is critical after implementing Google reCAPTCHA v3. By verifying the presence of the reCAPTCHA badge, reviewing the admin console, and troubleshooting common errors, you can check if reCAPTCHA v3 runs on your site. To address emerging issues and improve overall site security, regular monitoring and manual adjustments are required.

reCAPTCHA v3 and the Future of Bot Protection

The need for advanced bot protection solutions has never been greater. Google reCAPTCHA v3 uses a signal-based method. This method can quickly reach its limits with atypical user behavior that results in a complete lockout or traditional reCAPTCHA challenges such as clicking on traffic lights or cars.

Modern CAPTCHA solutions aim to provide robust security while maintaining a seamless user experience. Unlike reCAPTCHA v3, which uses traditional CAPTCHA challenges with visual image recognition puzzles as a fallback solution, modern CAPTCHA providers use a cryptographic proof-of-work mechanism.

Proof-of-Work CAPTCHAs for Modern Bot Protection

Proof-of-work CAPTCHAs are a modern approach to protecting against bots. They require users’ devices to perform a small computational task that is difficult for bots and invisible to humans. This method uses the computing power of the user’s device and allows you to protect your web interactions from bots and fraudulent actors without direct user interaction.

One of the main benefits of a proof-of-work CAPTCHA is its ease of use. Because this type of CAPTCHA works completely in the background, it provides an invisible user experience without interfering with normal website activity. Users do not notice the presence of the CAPTCHA, so their interaction with the website is smooth and uninterrupted.

From a security perspective, a proof-of-work CAPTCHA provides a significant improvement in protection against automated attacks. Because this CAPTCHA requires bots to perform computationally intensive tasks, it is impossible for bots to circumvent the security measures. This additional layer of security helps reduce the risk of bot-driven abuse and fraudulent activity on a website.

Another important benefit of a proof-of-work CAPTCHA is privacy. Unlike traditional methods such as reCAPTCHA v3, which can involve extensive data collection and persistent storage of user information, a proof-of-work CAPTCHA collects minimal data.

Proof-of-work CAPTCHAs typically don’t require as much user data, which strengthens user privacy and helps organizations comply with strict privacy regulations such as GDPR and CCPA.

While reCAPTCHA v3 remains a basic solution for protecting against bots, the emergence of modern CAPTCHA technologies offers new possibilities for the future of online security.

Next-generation solutions combine proof-of-work technology with advanced risk signal evaluation to significantly improve CAPTCHA security and minimize false positives.

One example of a next-generation CAPTCHA is Friendly Captcha, which we will explore in more detail below.

Secure captcha

Introduction to Friendly Captcha

Friendly Captcha provides robust and privacy-friendly protection against bots and spam. It incorporates advanced defense mechanisms and completely eliminates the need for traditional CAPTCHA challenges.

  • User Experience: Friendly Captcha’s proof-of-work approach requires no user input, making it user-friendly. Users are never interrupted or asked to solve manual puzzles, identify images, or type characters. This ease of use enhances user satisfaction and reduces the risk of abandonment during form submissions or transactions, which is crucial for maintaining high conversion rates.

  • Privacy and Data Protection: Friendly Captcha is designed with privacy as a core principle, collecting minimal user data. Friendly Captcha does not use HTTP cookies and does not use persistent browser storage. This approach ensures compliance with strict privacy regulations such as GDPR and CCPA.

  • Accessibility: Friendly Captcha is inherently accessible to users with disabilities. By completely removing visual or interactive CAPTCHA challenges, it ensures barrier-free access for all users, regardless of ability, and complies with WCAG standards.

  • Security: Friendly Captcha’s proof-of-work technology is highly effective against bots. By requiring a scalable computational task that bots find difficult to perform efficiently, combined with advanced risk signals and difficulty scaling, it provides a robust defense against automated attacks.

Friendly Captcha stands out for its secure, user-friendly, privacy-conscious, and highly accessible approach. Its proof-of-work system ensures the highest level of security without compromising user experience or accessibility, making it a modern alternative to reCAPTCHA v3.

Final Review of reCAPTCHA v3

With its signal-based operation, reCAPTCHA v3 is a step forward within traditional CAPTCHA technology. However, reCAPTCHA v3 falls short in several critical areas:

  • reCAPTCHA v3’s extensive data collection and use of cookies raises privacy concerns and issues with data protection regulations, such as GDPR and CCPA.

  • Its reliance on intrusive image-based challenges in fallback cases diminishes its usability promise.

  • reCAPTCHA v3’s accessibility limitations make it a frustrating experience for many users, especially those with disabilities.

  • Integration and ongoing manual administration of reCAPTCHA v3 are complex.

Given these limitations, reCAPTCHA v3 is not an ideal solution for modern enterprise bot protection. The landscape of online security demands more sophisticated, user-friendly, and privacy-conscious alternatives.

Friendly Captcha stands out as a superior choice, addressing the critical shortcomings of Google reCAPTCHA v3. With its proof-of-work mechanism, Friendly Captcha operates truly invisible, ensuring robust bot protection without compromising user experience or CAPTCHA accessibility. It eliminates intrusive data collection, aligning with privacy regulations and fostering user trust.

If you are serious about enhancing your website’s security while providing an invisible, acessible and privacy-compliant user experience, it’s time to reconsider the use of reCAPTCHA v3.

Explore Friendly Captcha and discover how it can offer superior protection, maintain user satisfaction, and ensure compliance with privacy standards. Switch to Friendly Captcha and take a decisive step towards a more secure and user-friendly online presence. Sign up for a free test account.

 

FAQ

To use reCAPTCHA v3 on your website, you must first create a free Google Account. Then proceed with the frontend integration of reCAPTCHA v3. Add the code and configure the client-side code after adding the script. Now you need to decide if you want reCAPTCHA v3 to be automatically added to the button or if you want reCAPTCHA v3 to be automatically invoked. The next step is to work on the backend integration of reCAPTCHA v3. For various user interactions, such as payment transactions or user verification, reCAPTCHA v3 displays a risk score. Based on the reCAPTCHA v3 risk score, you can then set a score threshold and appropriate actions to secure your site.

If you are looking for a CAPTCHA solution that works out of the box and does not require a lot of administration, Friendly Captcha is the right choice. There’s no need for users to manually solve challenges or for site owners to set risk thresholds to distinguish bots from real people.
reCAPTCHA v3 does not initially provide visual challenges to verify whether a user is a human or a bot. reCAPTCHA v3 uses signal-based scoring with manual user tasks as a fallback solution to ensure when the snippet is selected by Google, it already contains the information about the manual fallback tasks. To do this, reCAPTCHA v3 works mostly in the background to continuously analyze user behavior and assign a risk score.

However, when user behavior becomes atypical and the background check is no longer sufficient for verification, reCAPTCHA v3 requires a fallback solution. Typically, reCAPTCHA v2 is used, which requires visual challenges. This negates the accessibility and simplicity of the approach. For a fully accessible CAPTCHA, you should take a closer look at Friendly Captcha. With the modern proof-of-work approach, it does not require manual image recognition puzzles and is even WCAG compliant.
Yes, reCAPTCHA v3 can be integrated with other fraud prevention tools. Google reCAPTCHA v3 can interact with existing bot protection. Once you add a CAPTCHA like reCAPTCHA v3 to your website or mobile application, an additional layer of fraud detection security is added to your site.

If you want to integrate a secure, accessible, and privacy-friendly reCAPTCHA v3 alternative into your existing fraud tools, Friendly Captcha is worth a look.
If legitimate users are being blocked or challenged too often, consider adjusting the score threshold. Finding the right threshold between security and blocking human users is not easy. You can also implement fallback methods, such as email verification or traditional CAPTCHAs, for users who fail the initial reCAPTCHA v3 assessment.

It is these fallback solutions that make the invisible and therefore accessible approach of reCAPTCHA v3 obsolete. When known image recognition tests are run for atypical behavior, they are difficult or impossible to solve for blind people and people with other disabilities. If you are looking for an accessible CAPTCHA, you will find it at Friendly Captcha with its proof-of-work solution.
reCAPTCHA v3 is available for mobile apps with convenient SDKs. The reCAPTCHA v3 Mobile SDKs protect iOS and Android apps from fraudulent activity, spam and abuse. After completing the extensive integration process, site owners must now set the appropriate threshold to distinguish bots from humans. Setting a binary value can be quite tricky in some circumstances and comes with the well-known CAPTCHA accessibility issues.

A CAPTCHA that offers the best security, usability and WCAG accessibility is Friendly Captcha. Learn more about Friendly Captcha’s proof-of-work approach here!

Typical forms of online fraud include bot attacks, spam bots, website scraping, account takeovers, fake accounts, credential stuffing, payment fraud, card testing, chargebacks, stolen instruments, and gift card testing. To protect against online fraud, CAPTCHA solutions such as reCAPTCHA v3 and Friendly Captcha are used. Friendly Captcha provides a new generation of CAPTCHA with simple, user-friendly, and accessible protection against typical online fraud. Try out yourself and sign up for a free test account!