Most Popular Scripts | PHP | Scripts & Programs | Security Systems | Captcha Scripts

Securimage is an open-source free PHP CAPTCHA script for generating complex images and CAPTCHA codes to protect forms from spam and abuse. It can be easily added into existing forms on your website to provide protection from spam bots. It can run on most any webserver as long as you have PHP installed, and GD support within PHP. Securimage does everything from generating the CAPTCHA images to validating the typed code. Audible codes can be streamed to the browser with Flash for the vision impaired.

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.

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.

Advanced Textual Confirmation is an universal antispam for forums, blogs, contact forms, and others. It is a smart textual CAPTCHA, which challenges site visitors only once, and then disappears. To install, no database required, no graphical libraries required, just insert one line into your script.

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.

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 spambots and the like because they cannot tell what a picture is of. Includes free, friendly support.

Advanced CAPTCHA class which does not require any image processing extensions (GD/ImageMagick/etc). Developed to be readable by humans and resistant to OCR software. It generates black-and-white images with few distorted letters and noise. Checking algorithm is case-insensitive. It has very simple API (documentation is available on download page) which makes it easy to implement it on new and existing websites.

With all the Captcha decoders these days, its impossible to build a solid Captcha image validator with a string. The solution? Have a captcha that asks simple math addition questions! Decoders are not very good at breaking these. This tutorial will show you how to make a basic math CAPTCHA validtion form. This requires that you have the GD library for PHP installed to work.

This is simple, complete and powerfull captcha tool written in PHP for protecting your web FORMS from spammers.Under GPL. A good solution for this is to use an random code that is generated by a script the code will be displayed as an image so only a person could read the image and type the number. "Captcha ZDR" offers several methods of captcha protection, different fonts, string protection, calculation protection (sum and deduction), noise in image, string symbols are hard for reading from spamer machines. * 8 unique backgronds for captcha image. * Easy to install in your web pages. * No DataBase required. * Hard Protection $_SESSION['captcha'] variable contain RIGHT result from CAPTCHA image. You can use example.php and example_submit.php for more information.

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.

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.

EM Captcha - Visual PHP captcha class from EM-Creations.co.uk EM Captcha is a simple and easy to implement PHP captcha class. Requirements: PHP version 5.4.0 or above GD Image Library and SQLite3 PHP Extentions

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.

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.

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.

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.

This PHP script creates an image with a security code (known as "captcha") that can be used to protect e.g. your guestbook from spam. It requires PHP 4.1.0 or higher with session support and GD library.

Security code image generator and verifier. Requires GD support (most modern PHP installations) and mySQL. No image caching required. Configurable fonts, colors and captcha lengths.