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What’s The Purpose Of CAPTCHA Technology, & How Does It Work?


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As per the internet record, approximately 200 million captcha tests are completed online every day. If you’ve not got a captcha test on your website, you need to know how it can be beneficial for your business or blog.

What Is A Captcha?

The word captcha stands for ‘wholly automated public Turing’ test to tell computers and humans apart. Captchas tools you can use to find out the difference between real users and automated users. CAPTCHA’s challenges are difficult to perform for computers.

What Are CAPTCHAs Used For Websites Or Blogs?

CAPTCHAs are used by any website or blog that wants to restrict usage by bots. Its specific uses include;

Maintaining Poll Accuracy

CAPTCHAs can prevent poll angles by ensuring that a human enters each vote. It makes the time required for each franchise.

Limiting Registration For Services

CAPTCHAs prevent bots from spamming registration systems to create fake accounts. Its particular account restriction precludes the waste of service resources and reduces the chances of spamming.

Preventing Ticket Inflation

Ticketing systems use in the CAPTCHA to limit scalpers from purchasing large numbers of resale tickets. It helps to prevent false registrations as well.

Preventing False Comments

CAPTCHAs can prevent bots from spamming messages, contact forms, or review sites. CAPTCHA’s extra step also helps to reduce online social harassment.

How Does CAPTCHA Work?

CAPTCHAs work by providing information to a user. Traditional CAPTCHA provided overlapping letters and numbers. The distortion of the letters made it difficult for bots to interpret the text and prevented access until and unless the characters will be verified.

This CAPTCHA type relies on a human’s ability. It will help to generalize and recognize novel patterns. In contrast, bots can often only follow set marks and characters. Since CAPTCHA was introduced, bots are better able to identify traditional CAPTCHAs with algorithms trained in pattern recognition. Due to development, newer CAPTCHA methods are based on more complex tests.

What Are The Benefits Of Captcha?

Essentially captchas detect hackers from abusing online services. It has the functional capability to block robot software from submitting fake online requests. Captcha tests can be used in various factors, such as;

  • Protect the integrity of online polls by stopping hackers from using robots to send incorrect responses.
  • Stop brute force attacks on online accounts in which hackers repeatedly try to log in using hundreds of different passwords.
  • Prevent hackers from signing up for multiple email accounts 
  • Stop cybercriminals spamming blogs or news content pages with dodgy comments and links to other websites.
  • Prevent ticket touts from using robots for bulking buy tickets 
  • To make online shopping more secure and safe. 

                             CAPTCHA’s Types

Modern CAPTCHAs fall into three main categories such as;

  • Text-based CAPTCHAs
  • Image-based CAPTCHAs
  • Audio-based CAPTCHAs

Text-based CAPTCHAs

Text-based CAPTCHAs are the way in which human beings will verify via word code. Some text-based CAPTCHAs also include variations in capitalization. The CAPTCHA presents these characters that are alienated and requires interpretation. Alienation can involve scaling, rotation, and distorting characters. Although alienation protects against bots with insufficient text recognition algorithms, somehow, it can also be difficult for humans to interpret it correctly.

Text-based CAPTCHA Patterns

Techniques for creating text-based CAPTCHAs include;

  • Gimpy
  • EZ-Gimpy
  • Gimpy-r
  • Simard’s HIP


Image-based CAPTCHAs replace text-based ones. These CAPTCHAs use graphic pictures, such as photos of animals, shapes, scenes, etc. Image-based CAPTCHAs require their users to select images or identify pictures that don’t fit with the theme.


It is an alternative that grants accessibility to visually impaired users. Audio CAPTCHAs present an audio recording of a series of letters or numbers that a user enters from background noise.

Math Or Word Problems

Some CAPTCHA mechanisms require solving a mathematical problem. Asking the user to type the missing word in a sentence or complete a sequence of several related terms. 

Social Media Sign-In

A popular alternative to CAPTCHA requires users to sign in using a social profile. The user’s details will be automatically filled by sign-on on Facebook, Google, or LinkedIn social media websites. It is a convenient registration mechanism.

How Do I Add A Captcha Form To My Website?

You can add a captcha plugin to your site if your website is based on WordPress. There are many options in the WordPress plugin directory, but you’ll want to choose one that has been updated recently and has a decent number of active installations.

For websites, you might need tech experience to add a captcha in the form of HTML knowledge. If your business has its web development team, then they can do it quickly. Google offers developers detailed instructions to install a reCAPTCHA free of cost.

As we’ve seen, CAPTCHAs are an essential part of the online ecosystem. Without CAPTCHAs, malicious hackers would be able to create thousands of accounts for spamming. CAPTCHA creators have done a lot to make them as non-intrusive as possible for ordinary people.

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