Convert bkg to webp Online: bkg2webp

You can use Tom's Editor to easily convert images from
Movie Maker Background .BKG to WebP .WEBP.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

BKG

Movie Maker Background is an image format with extension BKG.

WEBP

WebP is an image format with extension WEBP.