Google reCAPTCHA Keys Beginners Guide

For your information, Google reCAPTCHA Keys offers a free service to your website safeguarding it from spam and abuse. Further, Google’s reCAPTCHA Keys algorithm uses an advanced risk analysis engine and adaptive CAPTCHAs. In general, to keep automated software from engaging in abusive activities on your site. Moreover, it does this while letting your valid users pass through with ease.

Additionally, through Google’s reCAPTCHA developers workspace ( Google codelab) you’ll clearly note that you’ll be provided with more than just the spam protection. For example, as soon as Google’s reCAPTCHA Keys are solved, human efforts facilitate a variety of solutions. Such as that human effort helps;

  • digitize text,
  • annotate images,
  • and build machine learning datasets.

Of course, this, in turn, helps preserve books, improve maps, and solve hard AI problems.

Choosing the right type of Google reCAPTCHA Keys

But how do you choose the right reCAPTCHA Keys for your general website and online use? Well, to understand this, it is important to realize that, for example, Google offers 4 types of reCAPTCHA Keys. Especially when creating or affiliating to a new site.

For web users, you can get the user’s response token in one of three ways. Including,

  1. g-recaptcha-response POST parameter when the user submits the form on your site.
  2. grecaptcha.getResponse(opt_widget_id) after the user completes the reCAPTCHA challenge.

Whereby, below is an illustration showcasing the backend of Google Developers reCAPTCHA Key platform.

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There are four types of reCAPTCHA to choose from when creating a new site.

Without further ado, lets breakdown the main reCAPTCHA Keys that Google Platform provides. However, it is equally important to point out that, the Google reCAPTCHA Keys were initially five. Not until the v1 reCAPTCHA Key was shut down since March 2018. Ushering in the usage of the remaining four reCAPTCHA Keys. Namely the,

  1. v3 reCAPTCHA Key,
  2. the v2 reCAPTCHA Key (“I’m not a robot” Checkbox),
  3. v2 reCAPTCHA Key (Invisible reCAPTCHA badge),
  4. and v2 reCAPTCHA Key (Android)

1. Version 3 reCAPTCHA Key

Notably, reCAPTCHA v3 allows you to verify if an interaction is legitimate without any user interaction. Whereas, it is a pure JavaScript API returning a score. Giving you the ability to take action in the context of your site. For instance

  • requiring additional factors of authentication,
  • sending a post to moderation,
  • or throttling bots that may be scraping content.

2. Checkbox Version 2 reCAPTCHA Key 

For your information, the reCAPTCHA v2 (“I’m not a robot” Checkbox) requires the user to click a checkbox. In that case, indicating that the user is not a robot. Whereby, this will either pass the user immediately (with No CAPTCHA) or challenge them. For instance, to validate whether or not they are human. As can be seen through the image below;

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Google’s reCAPTCHA v2 is one of the best commonly used Keys suitable for brand new websites.

Surprisingly, this is the simplest option to integrate with on new sites. Not to mention, it only requires two lines of HTML code to render the checkbox.

3. Google’s invisible Version 2 reCAPTCHA Badge

Remarkably, the invisible reCAPTCHA Key badge does not require the user to click on a checkbox. Instead, it is invoked directly when the user clicks on an existing button on your site. In addition, it can be invoked via a JavaScript API call.

Generally, the integration requires a JavaScript callback when reCAPTCHA verification is complete. By default, only the most suspicious traffic will be prompted to solve a captcha.

Google reCAPTCHA Key
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To alter this behavior edit your site security preference under advanced settings.

4. Android’s Version 2 reCAPTCHA

Correspondingly, the Google reCAPTCHA v2 Key Android library is part of the Google Play services SafetyNet APIs. Equally, this library provides native Android APIs that you can integrate directly into an app.

In the same fashion, you should set up Google Play services in your app and connect to the (GoogleApiClient). Of course, before even invoking the reCAPTCHA API. To say nothing of, this will either pass the user through immediately (without a CAPTCHA prompt) or challenge them. In the light of validating whether they are human or robot.

User-based Guide on Google reCAPTCHA Key usage

With the release of version 5.1 of Contact Form 7, Google’s reCAPTCHA version 3 (v3) became the default. Whereby, Google’s reCAPTCHA v3 does away with the (“I’m not a robot” checkbox). In particular, on Contact Form pages, but it loads and runs on every page. Adding an obtrusive badge, well, everywhere.

A. Determining usage in regards to the site visits

Google explains that the more pages the reCAPTCHA v3 script run on, the more accurate it will be. Above all, in determining whether visitors are human or bots. In their FAQ, they also state that the badge can be hidden. But, you are allowed to hide the badge as long as you include the reCAPTCHA branding visibly in the user flow.

B. Hiding the reCAPTCHA Keys

Google doesn’t offer more information about how Invisible reCAPTCHA works. But the system probably analyzes things like;

  • typing speed,
  • cursor movements,
  • and the rate of scrolling to determine whether a visitor is a human or a bot.

Furthermore, Google Bots often do the opposite. Whereas, they look for certain elements and work as quickly as possible. So what’s the best way to hide the badge everywhere but on the contact form page(s)? Enter CSS3’s “not” selector. Learn more about how you Hide the Contact Form 7 Google v3 reCAPTCHA Badge.


Generally, Google Developers Codelabs provide a guided, tutorial, hands-on coding experience. Most codelabs will step you through the process of building a small application or adding a new feature to an existing application. They cover a wide range of topics such as Android Wear, Google Compute Engine, Project Tango, and Google APIs on iOS.

Resourceful References;

  1. The jmexclusives: Cloud Computing & Technology 
  2. Android Developers: API Reference
  3. Yoast: What is Googlebot
  4. SEO Expert: Google Rankings: How Long Does It Take in 2019?
  5. Google News: Googlebot Web Crawlers Knowledge Base

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