Convert bmp to 3 Online: bmp23
You can use Tom's Editor to easily convert images from
Microsoft Windows bitmap .BMP to ZX Spectrum's 3 .3.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
Format created by Microsoft for their Windows and OS/2 operating systems. Images can be compressed or not.
ZX Spectrum's 3 is an image format with extension 3.