Input a unicode hex value (between 0000 and FFFF) and a starting and ending position to change the width of a particular unicode character. These positions are the local pixels in your glyph font sheets, such that 0 is the left-most pixel of the character's tile and 15 is the right-most. If both the starting and ending positions are the same number, the width will be 1 except if the positions are 0, in which case the width will be 0 and the character will not display. Thus if you have a 1-pixel-wide character, it cannot be in the left-most position of its tile. Click "Generate" to create and download a glyph_sizes.bin file to use for your resource pack that contains the changes made.