Lorem6 is a web tool that helps designers and content producers to quickly determine maximum character counts of text fields by injecting character counts in lorem ipsum text. The interval can be set to a value between 10 and a 100.
This saves the extra step of copy pasting text in character counting tools. It can also help to decide on a an accessible width of a larger text area which should ideally count a maximum of 80 characters per line (www.w3.org). Just set the character interval count to 80 and the text itself will help you in determine the desired width.