I have been working on creating some templates for Instagram Stories for myself and once they are ready to go I am going to offer them for free on our Shop.
The Best Instagram Story Dimension are 1080 x 1920 pixels. The minimum resolution for Stories ads is 600 x 1067 Pixels. Your stories can be in JPG or PNG Format. The higher the resolution the better for clarity of your images.
I create my images at 150 DPI but you can create them anywhere form 75-300 dpi. I will link my new Instagram story templates as soon as they are up and ready!