Convert gbr to flif Online: gbr2flif
You can use Tom's Editor to easily convert images from
.GBR to Free Lossless Image Format .FLIF.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
GBR are images that can be used as brushes in GIMP image editor.
Free Lossless Image Format is an image format with extension FLIF.