Quick and Simple Guidance for You in Google reCaptcha

What is ReCaptcha?

reCAPTCHA is a free service which is provided by Google to protect your websites from spam and abuse.

A “CAPTCHA” is a turing test that keeps human and bots apart. By adding reCAPTCHA to a site, you can block automated software while helping the welcome users to enter the website with ease.

It is a security service that protects your websites from fraud and abuse. It also protects you against spam and other types of automated abuse. An advanced risk analysis engine and adaptive challenges are used to keep malicious software from engaging in abusive activities on the websites.

Meanwhile, acceptable users will be able to log-in, make purchases, view pages, or create accounts and fake users will be blocked.

There are four types of ReCAPTCHA from which you can choose from when creating a new site.

  1. ReCaptcha V1: In November 2017 Google began to phase out the well-known reCaptcha version 1, It was commonly found on websites below inquiry forms that asked you to type in the numbers you see in the photos which resulted in its retirement.
    This makes confusion for many website owners who may have only discovered this was an issue after getting reports from customers that their website inquiry form was not working, or they could not register on their website.
  2. ReCAPTCHA V2 (“I’m not a robot” Checkbox): The “I’m not a robot” Checkbox gives user option to click a checkbox indicating that the user is not a robot. The user will either pass immediately or will get a challenge to validate whether or not they are human.
    This is the simplest way to integrate and requires only two lines of HTML code to render the checkbox.
  3. ReCAPTCHA V2 (Invisible reCAPTCHA badge): The invisible reCAPTCHA badge doesn’t require the user to click on a checkbox, instead, this is invoked directly when the user clicks on an existing button of the site or it can be invoked by a JavaScript API call.
    The integration of this captcha requires a JavaScript callback when reCAPTCHA verification is complete. By default, only the most suspicious traffic will be asked to solve a captcha.
    To alter this behavior security preference under advanced settings can be edited.
  4. ReCAPTCHA V3: ReCAPTCHA v3 returns a score for each request without user interference. The score here is based on the interactions of the user with the site based on which appropriate action for your website can be taken.
    Register reCAPTCHA v3 keys from Google reCaptcha website. reCAPTCHA v3 will never interrupt the users, so you can run it whenever you like without affecting the conversions of users. This is best suitable when it has the most context about interactions with your site, which will come from seeing both legitimate and abusive behavior.
    For this reason, it is recommended to include reCAPTCHA verification on the forms and actions as well in the background of pages for analytics. For the information, about how to integrate Recaptcha one can visit Google reCpatcha site.
    Score Interpretation in reCAPTCHA v3 which returns a score (1.0 is very likely a good interaction, 0.0 is very likely a bot). Based on this score, you can take an action in the context of the website.

Efficiency Of Recaptcha:


  • It is based on an “advanced risk analysis system” which heavily relies on Google cookies. If someone uses Chrome or has been logged into a Google account for a while, they all will most likely have to tick a box. On the other hand, A Firefox user who has disabled third-party cookies is more likely to get a difficult image recognition challenge.
  • But not everyone uses Chrome and is comfortable using Google’s services. In fact, now people are more concerned about their online privacy. They choose to prefer privacy-conscious browsers such as Firefox or Brave, and they might even use a VPN to browse the Internet.
  • ReCaptchav2 gives these users some tough challenges, which degrades their user experience and also leads to lower conversion rates. Furthermore, since this is more common cybercriminals have found increasingly more efficient automated solutions to crack even the most difficult reCaptcha v2 challenges.


  • This one is easy on humans, except for website admins After a number of complaints raised from its users, Google developed reCaptcha v3 to provide a better user experience. Unlike v2, it is transparent for website visitors. It has no challenge to solve. Instead, it monitors the visitor’s behavior continuously and determines whether it’s a human or a bot.

For every request, it gives a score between 0 and 1 which represents, how likely is a request originated from a bot. Close to 0: you’re a bot. Close to 1: you’re a human.

  • To improve the accuracy of the score, site administrators can define specific actions, such as “sending a friend request” or “homepage” so to help understand how normal behaviour of users will vary depending on the context.
  • However, while reCaptcha v3 clearly improves the human user’s experience by eliminating the need to disrupt their browsing with reCaptcha challenges, it also raises some problems for site administrators.
  • While with reCaptcha v2, the only required action is to verify whether the user correctly solves the challenge or not but with reCaptcha v3, you now need to decide which action to be taken depending on the score. The configuration of this captcha is a bit tricky.

Depending on each action a user makes on the website, you have certain possible responses:

Either you give the user access to the requested resource or ask the user to solve a reCaptchaV2 to determine if they’re human or you can block the user. This means you need to decide, for each action, where you want to place the threshold for a particular response.

  • Will you block the user when their score falls below 0.25,
  • Will you provide them a v2 reCaptcha? What about 0.15?
  • Will you fully block them, or does 0.10 seem more appropriate?

That makes a decision to be taken, for each action, where you want to place the threshold for a particular response. Whether you want to block the user when score is below 0.25 or will serve them a reCaptcha V2. Will you fully block them, There are no clear-cut answers, which makes these questions more difficult.
One issue here is that the stricter you make your thresholds, the more likely you are to block actual users. On the contrary: the looser the thresholds, the more likely bots will be undetected. You’ll need to make as compromise between not blocking too many users and not allowing too many bots.


ReCAPTCHA has been proven to at the forefront of bot mitigation for over a decade and actively protects data for our network of four million sites.
An effortless fraud detection service that stops bots and other automated attacks while approving valid users.
Google’s reCaptcha risk-based algorithms which apply continuous machine learning that factors in every customer and bot interaction to overcome the binary heuristic logic of traditional challenge-based bot detection technologies.
While reCaptcha can help block some bot traffic, they come with many problems. Recaptcha degrade the user experiences, they do not have real feedback mechanisms, they can lead to false positives and negatives, and also don’t detect advanced bots.
No Recaptcha version can therefore be considered as a proper bot management solution.

For any organizations seeking assistance in implementing new features to their website, or keeping their online operations at peak performance, check out the support services we offer here or if you have already your website; we will happy to audit your website FREE.

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