LX Password Generator is simple yet nifty password generation form to be placed in any page or post you like.
You can choose from upper and lower letters, digits and special characters to make your new hardcore passwords impossible to break. And yes, all the passwords are generated only within client's browser session and are not saved anywhere on the server side, so it is absolutely safe to use in real world.
You can also specify the following attributes to tune the form's appearance:
length=4..64specifies the default length of a password. Allowed values range from 4 to 64.
upper=1enables upper-case letters option. Activated by default.
lower=1enables lower-case letters option. Activated by default.
digits=1enables digits option. Activated by default.
special=1enables special characters
,.:;_=option. Disabled by default.
Plugin's Official Site