SpriteMaster is a free and open-source tool for converting, editing, and optimizing images for use in the game StarDew Valley. It supports a wide variety of image formats and uses the xBRZ algorithm for resampling, which provides higher-quality and more efficient results.

It is designed to be used in conjunction with other mods. It supports all of the different types of mods, from those that change the game world to those that add new content to the game. It supports a wide variety of content-changing mods.