WHAT IS A VECTOR IMAGE?
Vector images allow for more flexibility compared to a Raster Image. Vector file types such as EPS, AI and PDF* are perfect for creating images that will require resizing. Your logo should be created as a vector and saved as such so you can use it with smaller items such as your business card and letterhead, but also on larger surfaces, such as a custom flag or billboard. You will likely still need to save a JPG or PNG for use on the web from this vector file.
IS MY ARTWORK VECTOR?
If your artwork saved as EPS, AI or PDF* it is likely that it’s a true vector file. However, re-saving a raster image with an EPS, AI or PDF extension will not render it vector. There is no way to convert a raster file into a vector file without redrawing the art. This makes it vital to save
a master vector file from the start.
If your artwork is saved as JPG, PNG, GIF, or TIF it is not a vector file. These are raster images which are created with pixels as opposed to a smooth line created using mathematical formulas.
If you’re still unsure, zoom in on your logo. If you see pixels or individual squares, this is a raster image. If you see a smooth line, it is a vector image.
*A PDF is generally a vector file. However, depending how a PDF is originally created, it can be either a vector or a raster file.