Editing .bcfnt Files - Ich73/DQM2-FanTranslation GitHub Wiki

The basic workflow of editing .bcfnt files is to convert the original .bcfnt file into an image, editing the image and then converting the edited image to a new .bcfnt file. It is important to note that those image files cannot be edited with most image editing programs since the format is not common (ARGB8). You also have to take care to create the modified font file with the same color format as the original (RGBA4, A4, ...).

A good tool for editing those image files is Pixelformer.