What is JFIF - JPEG File Interchange Format? The JPEG File Interchange Format (JFIF) is a type of image file format that adds extra features to the basic JPEG format. It’s recognized under some technical standards, but basically, it helps handle things like resolution, aspect ratio, and color better than the original JPEG format. Even though it’s not the very first JPEG standard, it’s still commonly used and labeled as “image/jpeg.