EPS – Use EPS files for all high-quality printing and publishing. This is also the format most vendors will need for creating a product (banners, T-shirts, mugs or other giveaways). The EPS format is not pixel-based and can be enlarged to any size without becoming blurry. If you do not have an advanced graphics program, such as Adobe Illustrator, you will not be able to open an EPS file — but you can view it by placing it into Microsoft Office programs. However, make sure to send your vendor the original EPS file.
PNG – These files are good for use online as well as in PowerPoint and Word. The PNG format is pixel-based and will become blurry if enlarged. These files are not a good option for high-quality printing and publishing.