How to use captcha killer

Written by chris caruso
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How to use captcha killer
Captchakiller enables users to automatically bypass typing in CAPTCHA codes. (computer image by Hao Wang from

CAPTCHA (Completely Automated Public Turing Test To Tell Computers and Humans Apart) is a program created to protect websites from bots. CAPTCHA usually has users read and transcribe an image of distorted text that a computer would not be able to figure out. Captchakiller is a program developed to automatically transform images to text and bypass CAPTCHA.

Skill level:


  1. 1

    Launch Captcha Killer and click on the "Main" tab. Under the "Form" type select "Form with captcha" and under "Login Method" select "Post."

  2. 2

    Copy the website URL of the site you're trying to bypass CAPTCHA. Paste the URL in the "Retrieve from" bix. Check the box next to "Use form action to automatically determine dynamic login URL."

  3. 3

    Click on the "<input>" tab and type img in the "Captcha" field.

  4. 4

    Click on the "<img>" tab and click "Scan." Go to the website you're trying to bypass, right-click on the image of the CAPTCHA itself and click on "Copy Image Location." Paste it into a new tab on your web browser. Note the name of the .jpg file and locate it <img src=> box in Captcha Killer.

  5. 5

    Cut and paste that value into the "Captcha picture unique identifier substring" field.

  6. 6

    Click on the "Captcha" tab. Click on "Reload" then click "Process Image." If the OCR box says "ERROR," check the boxes next to "Linearize colour Levels." Adjust the "Brightness Threshold" and "Scale" using the arrows on the pull down menu. Click on "Process Image" again.

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