Is it possible in Blender to create a animated png vertical strip? I want to create a png file that is an animation of fire for a Minecraft resource pack. I can render the images as separate files and painstakingly put them together in Photoshop. I would rather see if I can do that in Blender or with another tool?

Here is an example of the desired outcome. Sorry for the size.
Spritify add-on

Spritify is an add-on for making sprite sheets and even animated gifs. It has one external dependency: ImageMagick, a command-line tool for editing and creating images.