Captcha Scripts

A Captcha is a challenge-response image or text field that is usually placed at the end of forms to ensure that submissions are not from bots. For more information, please refer to our php captcha scripts post.

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  • Simple PHP/Javascript Capcha System

    This system uses a randomly generated, 8 character long, security code. The code is shown as 8 individual images aligned next to each other. Using a jQuery function, the code shows up one character after another until they all show; then it goes away and... (show more)

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  • identiPIC photo CAPTCHA

    This CAPTCHA uses pictures instead of characters. The user is invited to identify a picture (or pictures) to proceed. It can be used on any web form. It doesn't use a database. It is extremely simple to install with very minimal code. It stops... (show more)

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  • Micro Captcha

    Micro Captcha is a simple PHP script which generates captcha images to prevent spam form submissions. The script generates random images with a security code for you. Installation and usage is very simple. All you need to do is insert the php file as an... (show more)

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  • HelloCaptcha

    HELLOCAPTCHA announces the new generation of CAPTCHAs (wikipedia.org/wiki/CAPTCHA). We are proud to introduce the most effective technology for human tests. Our CAPTCHAs are combining the most recent results of computer science and art. Our CAPTCHAs are... (show more)

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  • A Simple PHP CAPTCHA Script

    This is one of the easiest CAPTCHA scripts you will ever use. While it doesn’t obscure the text, it will serve its purpose well for many people who need a low-level CAPTCHA solution. This script requires little-to-no setup. The only dependency is the... (show more)

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  • TRISTAT_SHA1_CAPTCHA

    Easy to include in any Mail Form: - prevents optical-character-recognition threats by obfuscation - prevents decoding threats by SHA1 encryption - prevents brute force techniques by using 6 characters easy to memorize ... (show more)

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  • CF Captcha v0.9

    A Simple PHP Anti-Spam Captcha Script based on PHP/GD, to help prevent web robot from flooding your Comments, Guestbooks, Contact forms or any other online application susceptible to spam. One of the main Features of this script is that it alternates... (show more)

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  • Securimage PHP CAPTCHA

    A highly customizable PHP CAPTCHA class for generating CAPTCHA images to prevent programs from filling out your forms. Securimage does everything from generating images to validating codes. It has support for streaming MP3 audio of the code to the... (show more)

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  • Simple PHP / GD CAPTCHA script

    Very basic and easy to customize PHP based captcha script. Can be used to block bots from any type of online application. Simply place in a html form and it is ready to deploy.

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  • Egglue Semantic CAPTCHA for Drupal

    Unlike conventional CAPTCHA, Egglue generates CAPTCHA challenges that require only basic intuitive abilities to solve and visitors are free to use any words deemed fit. The distinct CAPTCHA challenges and layout cannot be handled by typical spam bots.... (show more)

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  • Tell Somebody Captcha - PHP

    Tell Somebody same as above the main difference is this has reCaptcha integrated into it. You will have to go to reCaptcha site and signup for your personal keys but thats free and easy to do. Links are included, as with all files needed but your... (show more)

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  • Animated CAPTCHA validation images.

    This package can be used to create animated CAPTCHA images for website validation. To decode of these CAPTCHA images are difficult by web bots because the images are animated GIF and the frames of GIF images have not containts the validation string... (show more)

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  • Captcha V1

    An anti-spam form protection image written in PHP. Requirements: Unix, GD Libary

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  • PHP Captcha System. No DB required

    Easy to install captcha system to keep bots from making false submissions to your web forms. Requires PHP. Customizable in the following ways: * Choose Font Size * Choose Colors * Choose # of characters in string. * Choose... (show more)

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  • BQcaptcha

    Captcha is a free to download and free to use script. You can use it to protect own pages against spammers. Uses ttf fonts which can be easily replaced.

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  • PHP Captcha with Refresh

    This PHP class will protect the spam, with refresh the captcha image functionality.

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  • Phoca CAPTCHA

    Phoca CAPTCHA class is a small free class to show CAPTCHA image in your form. You can safe your form from Spam. You need PHP with GD library but you need not TTF support.

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  • phpOpenCaptcha

    The script gives an opensource implementation of a captcha covering the following features: The text is horizontally and vertically distorted. Further, it is possible to use your own font and background-color. The behaviour of the captcha can be... (show more)

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  • Custom CAPTCHA

    This class can be used to display images for CAPTCHA validation. It can display an image with a random text that the user needs to read and enter in a form to authorize the access to resources to real human users. The text is rendered over a given... (show more)

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  • Simple Math CAPTCHA

    This script asks the user to correctly answer a math problem before they can proceed, preventing spambots from registering or posting content to your site.

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