Application For Address Proof On Company Letterhead – Letterhead templates may be difficult to use, however there are some tips that will simplify your task easier. We’ll first take a look at the different letterhead formats. There are two basic types of format for letters, one-line and the double line form. Let’s discuss the differences between the two types before proceeding to the primary concept behind letterhead templates. Your corporate letterhead templates will likely contain your company’s name, logo and a description of your business and contact details.