I've partnered with a great company: Grey Matter Creations - They'll HAND convert your logo and output it for you in multiple formats (Vector/eps being just one of them). I've been pointing my Logo Creator customers to him for years.
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The other solution, and one that I have used myself millions of times -- is a Do-It-yourself tool called Vector Magic!
They have an online "Raster to Vector" conversion tool, AND an awesome desktop software product (for both Mac and Windows). If you do a lot of 'raster to vector' conversion, I highly, highly recommend these guys!
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If you're not sure what this all means, read on!
Images can be created using different image "formats" - many of us are familiar with JPG. This format is terrific for use on the web, and even in print - on smaller jobs. But if you wanted to use a JPG image on something larger, like a t-shirt, or cut into vinyl for a car wrap advertisement, you would not be impressed with the result.
JPG's are composed of small dots called pixels, much like newspaper print. If you enlarge the image to make it "bigger", you enlarge the dots - this is called pixelation. The end result is a fuzzy, or blurry appearance with random "artifacts" scattered throughout the image. Here is an example of a JPG image, before and after enlargement:
You can see the smaller "G" looks good - but when enlarged 500% for print, it becomes pixelated - why? Because it's made up of pixels. This is a raster image. A "raster" image is made up of small rectangular dots, known as pixels.
How to enlarge an image for print?
The best way to create images for print (or any large use, like billboards, etc), is to use vector images. A vector image is not created with dots or pixels, instead it's created with shapes and computer instructions. Geometric primitives like points, lines, curves and polygons based on mathematical equations make up the content of a vector image.
Think of a vector image as a list of instructions for the computer to follow. For instance, if you had a vector based image of the moon, the computer instructions might go something like this:
Computer - draw a circle 5 inches in radius, color gray.
Computer - draw a smaller uneven polygon, 60% smaller than the parent circle, color dark gray (a crater)
So using vector imaging, you can tell the computer to draw the shapes at ANY size. You are NOT enlarging anything, so pixelation does not occur.
Below is the same "g" - however, it has been converted to a vector image. You can see it enlarges with no blurriness or image artifacts.
See below for examples of converted images/logos:
This image is rasterized:
This image has been converted to vector:
Another raster image:
Converted to vector: