Ever wonder what format your JPG was saved in? Well wonder no more. Just open the JPG up in any text editor and do a search for the hex code ffda.

  1. 0 results: this image will load all at once when it is done loading
  2. 1 result: this image will slowly load from top to bottom in full resolution. this is called baseline.
  3. 2 or more results: this image will draw multiple passes of the image in better and better resolution. this is called progressive.