You do not need to use these Sprite font creators most of them are not very good.
I have discovered the best way to make Sprite font is use any good art design application. Make big grid , make individual characters that you need, snap the characters to the grid. Put all characters into group.
Then you can use the art design application to set font, gradient, glow, etc. Export as PNG .
Maybe takes a little longer but you have much more control.
There is no witdth data but this is easy to make yourself.