Convert to RGBA Online Tool.
An .RGBA file is a bitmap that uses the RGB color model with an added alpha layer that controls opacity. The .RGBA extension is used for bitmap files that use the RGB color model plus a new layer. This layer or channel is called alpha, and it controls the transparency or opacity of the colors and image. This file format is appropriate for when you want to place one image over another and see the bottom image through the top image. Files with the .RGBA extension can be opened with a number of programs, including Preview on Mac and XnViewMP on Windows systems. The file is convertable to formats such as .JPEG.