SWF is an Adobe Flash file format used for multimedia, vector graphics and ActionScript. This file format was created by macromedia and now is owned by Adobe. SWF is a file extension for a Shockwave Flash file format created by Macromedia and now owned by Adobe. The files are compressed to be small and support incremental rendering through streaming. SWF (/ˈswɪf/ SWIF) is an Adobe Flash file format used for multimedia, vector graphics and ActionScript. SWF (pronounced "Swiff") was originally an acronym for "Shockwave Flash" since the SWF format was designed for Shockwave Player.