KinglyWayne's simg2img_win : A simple toolset for Windows users that includes a convert.bat for easy one-click conversion.

The primary source code is hosted on GitHub (anestisb) . To run it on Windows, you will need to compile it using with zlib and libasprintf libraries. How to Use It

A format that only stores the parts of a partition that actually contain data, leaving out the "empty" space. This makes the file much smaller for downloading and flashing.

Are you planning to build your first custom ROM? KinglyWayne/simg2img_win: simg2img for windows - GitHub

: Specifically converts compressed .img files (sparse) used by Android's fastboot into raw formats that can be mounted or edited.