1. An apparatus comprising: a handwriting input device that receives input stroke data; a processor; and a memory that stores code executable by the processor to: identify a handwritten character from the stroke data; determine a deviation between the stroke data corresponding to the handwritten character and a reference character corresponding to the handwritten character; map the handwritten character to a font character of a user-specific font set based on the stroke data deviation; and create a file storing a character encoding corresponding to the font character of a user-specific font set.