Thanks for the link but I am frightened I may do something which makes the situation worse. For example the link shows $WAGLOBAL_Captcha_Noise = "FFFFFF" ; Specifies the hexadecimal code for the distortion used over the Captcha characters. Note that the “#” character is not included. I have no idea what the "FFFFFF" should be changed to to reduce the noise. I am assuming that all these changes are made in the WAVT.CaptchaSecurityImages.php file. I would really like to have something like the one used for this form but need some guidance. Can you help please as I am losing customers who get fed up with not being able to read the code and then have to redo the registration submission.