File format for Logos

The logo will appear as a letterhead, on the home page of the website, magazine and billboard advertising and a wide variety of merchandise. This means that the the file format must be able to support this. Therefore it would need to be able to change size without becoming pix-elated depending on where the logo will be appearing

This means that it would need to be saved as a Vector based file format. Vector images do retain appearance regardless of size, since the mathematical formulas dictate how the image is rendered. This will allow the logos to look detailed when appearing large up on a billboard, as well as appearing small on a letterhead. 

Pdf file format would be suitable as it can be vector based. This means it can use the mathematical formulas to avoid pix-elation of the logos. Also it is a small file size which makes it easy to share through email and it can be opened in all programs.