Formisimo observed over a two-month period that their password repeat field was responsible for over a quarter of all the people that abandoned their sign up process. Along with a few other changes, they were able to improve their Sign Up page conversions by 55%, and decrease by 24% the number of
corrections made in the Confirm Password field.
If a form has an email or password confirmation field, the natural reaction of most people is to copy-paste their email or password into that confirmation field. And thus, if they made a mistake in the first field, they will paste that mistake into the confirmation field.
By removing the Password Confirmation field, you should then allow users to see the password they’re typing so that they can verify it before submitting the form. This can be done with a “SHOW” text or icon button inside the Password field.