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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.
PHP Captcha Security Images
This script generates images (known as "Captcha's") which contain security codes used for protecting a form from spam bots. By encoding a 'password' inside an image and asking the user to re-enter what they see you can verify the user is a human and not automated software submitting your form.
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 between a simple math problems (Additions, subtraction and multiplication sums) and a random spring of characters.
JetScripts Text CAPTCHA System
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. Further, the use of plain texts rather than images improves accessibility.
An anti-spam form protection image written in PHP. Requirements: Unix, GD Libary
You can use this script to add captcha to your application for preventing bots and unwanted applications to fill up your forms on site. Very easy to setup and modifiable, you can even add new fonts to it. You can also use your custom font such as popular animal font that will prevent even from OCR applications recognizing the characters. Random rotation of characters makes it very hard for software applications to recognize the characters. And on the fly word creation makes this captcha UNBREAKABLE. Each time a new word is shown to the user and never repeats.
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.
PHP Captcha with Refresh
This PHP class will protect the spam, with refresh the captcha image functionality.
Simpli Captcha Validate Form is the perfect contact form to prevent those annoying bots from filling out your email form. The Simpli Captcha is a simple and easy to install form designed for beginner web designers and advanced enough for those wanting more. The Simpli Captcha image changes, providing you with a secure and easy to understand form validation. You can easily modify the contact form to your desire. Check out the example. Once your client fills in their information a confirmation email will be sent to them so they know you got their information. All files are included along with install instructions to get you up and running within a few minutes.
dicap Basic is the next generation captcha solution for your web application. Two features make dicap a unique and valuable solution for you: 1. The captcha is easy readable for the users. 2. It is very hard to computer-read the captcha and transform it into the right number-code
Imagize With Math - Image Verification Captcha Form Processing Script
Math Version see below The Goal of our CAPTCHA SCRIPT is to stop spammers, and automated programs or scripts from making post and/or submitting an online form. There are many free tutorials out there on accomplishing this process, ours sets up in 5 minutes or less, and works on Windows or Linux servers without issue. ONLY REQUIREMENTS PHP 4+ and the GD Image Library, this library is very common on every install of PHP. ABSOLUTELY no programming knowledge needed. So if it needs to work, and work effectively, and time is of the essence, this script is for you. This Version of Imagize Image Verification uses a simple math problem (ex. 4 + 3 =) background images, making it nearly impossible for any OCR (Optical Character Recognition) software from reading it. Our CAPTCHA Code also randomly shifts the position and "tilt" of each of the characters as well as the color of the characters. Stop Spam Now. Visit our online demo, README file, and detailed description today.
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 image source into your form. Later during the form processing you only need to check a session variable. Detailed installation instructions and an example code is also attached.
WebSpamProtect.com PHP CAPTCHA
This is a professional PHP CAPTCHA script to protect your site from spambots. You can customize: text type, code length, background color, font color, border color, image size, font type, font size. Also, you can click the refresh link to renew the CAPTCHA in case it is not readable.
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.
TheCAPTCHA - a powerful PHP script to protect your site from spambots. Free and open-source. Easy to install. TheCAPTCHA is creating much more secure from break CAPTCHA images than any script of previous generation.
Idut Human Checker
This is a useful script using CAPTCHA to make your PHP applications spam-proof. It takes seconds to install by simply including the Human Checker script on your page. It stops your pages being spammed by requiring users to enter a numeric code that they copy from a PHP generated image.
Imagize - Image Verification Captcha Form Processing Script
The Goal of our CAPTCHA SCRIPT is to stop spammers, and automated programs or scripts from making post and/or submitting an online form. There are many free tutorials out there on accomplishing this process, ours sets up in 5 minutes or less, and works on Windows or Linux servers without issue. ONLY REQUIREMENTS PHP 4+ and the GD Image Library, this library is very common on every install of PHP ABSOLUTELY no programming knowledge needed. So if it needs to work, and work effectively, and time is of the essence, this script is for you. Our Image Verification uses both letters and numbers against 1 of 4 included background images, making it nearly impossible for any OCR (Optical Character Recognition) software from reading it. Our CAPTCHA Code also randomly shifts the position and "tilt" of each of the characters as well as the color of the characters. Stop Spam Now. Visit our online demo, README file, and detailed description today. PRICE REDUCED
Animated Math Captcha
The first script creates a static JPEG image with many features, easily and fully customizable. The second script is a math captcha. that creates an animated gif showing a sum, always partially visible (three kinds of animation). Spambots and OCR softwares can never see the complete sum.
Dreamweaver Form Captcha
Avoid spam messages sent through your online forms. By inserting a captcha image into your forms you can be sure that only real people (not automatic programs) will be able to submit the form. This captcha is packed as Dreamweaver extension, you can insert it easily with a single click without any hand coding. You can configure the look and feel to make it match exactly with your site design. The validation code is inserted automatically into your protected pages.
This is simple, complete and powerfull captcha tool written in PHP for protecting your web FORMS from spammers. "Captcha ZDR" offers several methods of captcha protection, string protection, calculation protection (sum and deduction), noise in image, string symbols are hard for reading from spamer machines. 8 unique backgrounds for captcha image.