What is Captcha?, and What are the Benefits for Website Security

What is Captcha?, and What are the Benefits for Website Security

Hello everyone, welcome back to porkaone. Have you ever visited a website and wanted to take a certain action such as logging in or commenting, for example, then the website responded by giving you a challenge? If so, that's what is called a captcha.

Sometimes we think of captcha as annoying, because captcha can appear many times and sometimes the challenges given are a little inconvenient. But behind this annoying thing, captcha has a lot of functions for a website.

Well, in this article I will discuss the captcha functions for a website. But not only that, to increase your knowledge, I will also explain the meaning of captcha and examples of captcha that are currently available. Curious?, let's follow in full below.


So that your website is protected from spam, you need security features that ensure that your website is accessed by humans, not by robots. This feature is called Captcha. Generally Captcha consists of a series of letters and numbers. Then how does it work?.

The way captcha works is very simple, usually captcha comes with various challenge or test models. Examples of tests include choosing the appropriate picture, entering a series of letters or numbers, basic mathematical operations, guessing pictures, etc. Most spambots don't pass this test, especially if the captcha test is subject to change. So that only humans can do the test. That's why sometimes the captcha writes "verify whether you are human or robot" meaning the captcha is a verifier whether the website user is a human or a robot.

Captcha is usually located in the registration, login, or comment form. Yes, its function is none other than preventing robots from registering with fake accounts or giving unclear comments. Then what are the functions of captcha as a spam inhibitor for your website? See further discussion.

Contoh captcha, ScoooolyCC BY-SA 4.0, via Wikimedia Commons

Benefits of Using Captcha for Websites

1. Preventing Fake Account Registration

Captcha on the website can protect your website registration form from fake account attacks. Don't underestimate fake account attacks. A database full of fake accounts will affect the effectiveness of your email. Why?. If you send a marketing email to a fake account, the email will not go to an inbox.

if the number of marketing emails that bounced off was increasing, email providers such as Gmail, Yahoo, or Outlook would judge the reputation of your email address as bad. When your email reputation gets low, email providers will direct your marketing emails to the spam folders of recipients. As a result, your email marketing will not be effective. Fake accounts can also steal important data on your website. For example, like your personal data.

2. Prevent Spam Comments on Websites or Blogs

You must often find spam comments on your blog or store website. Examples are comments that promote an item, or comments that are not clear and usually include a link to a website.

If this happens often, don't ignore it, because the comments can make website visitors uncomfortable and eventually damage the reputation of your website. Search engines like Google will also designate websites with spam comments as spam viruses and cause your website to be removed from Google's search engine.

3. Securing Online Buying and Selling Transactions on the Website

Learn from the Supreme case. At that time, Supreme released and sold limited edition products on certain days. there are many robots who make purchases in large quantities, the goal is that the exclusive product is sold at a higher price.

So that the original buyer does not get the product at the original price and has to pay a higher price. There are even some spambots that charge membership fees for Supreme buyers. If this case happens to your online store's exclusive product, your online store's customer experience will certainly deteriorate. And threaten your brand reputation, right? By using Captcha then this can be overcome.

Types of Captcha

1. reCaptcha Google

This Google captcha is considered the most difficult for robots to penetrate, but it is very easy for humans to use. reCaptcha Google has a dataset and documentation that is divided into two versions, namely: google reCaptcha v2 and google reCaptcha v3. Google reCaptcha v3 provides automatic security verification and is considered simpler than Google reCaptcha v2. An example of how it works:

Your online store website has high traffic but low conversions. Then you want to know that high traffic actually comes from real visitors or robots. You can enter Google reCaptcha on each online store website page. such as on the login page, or product reviews.

Google reCaptcha will perform an automatic scan on visitor activity. Like scanning customer posts on review pages. captcha will immediately delete the post if it is detected as bot activity. Your customers will trust your review page more. Because the comments are genuine and free from bots.

google recaptcha
Google reCapthca

2. Text Captcha

Text captcha is a captcha consisting of a series of letters, numbers, or a combination of both. This type of captcha requires the user to enter an arrangement of numbers, letters or a combination of numbers and letters that is displayed. Website users who have visual impairments will be facilitated by this captcha. But it also has many loopholes for spambots to break because of its simplicity.

Contoh captcha, ScoooolyCC BY-SA 4.0, via Wikimedia Commons

3. Picture Recognition Captcha

Visitors are required to select a predetermined part of the photo before accessing a website page. captcha instructs visitors to select parts of the image of a traffic sign or an image of a particular object. Spam robots do not have the ability to recognize images. This type of captcha is more effective at preventing spam attacks. But obviously the activity of recognizing images will take time for website users.

source: arphaworb.com

4. Math Captcha

Math captcha is a captcha that contains a challenge or a simple calculation test. It can be in the form of addition or subtraction, usually users just enter the results of their calculations and submit to perform certain actions.

math captcha
source: forum.openbulet.dev

5. 3D Captcha

3D captcha is a text or number-based captcha with a three-dimensional concept. Because the difficulty level of this captcha is higher, it is also difficult for spam bots to penetrate. However, users can reload if they find it difficult to read the Captcha.

Ok, so this article about the meaning of captcha and its benefits for the website. Hopefully useful, if there is something you want to ask, please ask directly in the comments column below. See you in another interesting article. :D

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