When you think LOGO, think VECTOR FILE
Don’t let poor resolution keep you from getting the most out of your stunning logo. Send EPS or AI files! Steer clear of JPEGs, GIFs and PNGs; these are rasterized and lose quality when enlarged.
Send the biggest image – you can always size down, but even the best graphic designers can’t help you out if the image just isn’t big enough. To always ensure the resolution you want, think BIG.