Abstract: There is provided a device for editing a PDF file, including a display, a non-volatile storage medium, a memory and a processor. The non-volatile storage medium stores a computer program. The memory provides an environment for operations of the computer program in the non-volatile storage medium. The processor runs the computer program to parse the PDF file to obtain information of characters, generate character sets according to features of the characters, generate line sets according to heights and horizontal positions of the character sets, generate paragraph sets according to a height and a horizontal position of each line of the line sets, generate text region sets according a height and a horizontal position of each paragraph of the paragraph sets, and control the display to show the text region sets in the PDF file as editable text regions.