Hex file reader

Hi.I wanted to ask if there was any way to display the contents of a hex file.I have a file with the extension ‘.hex’.I know its part of a program code which i got from somewhere(only a hex file,nothing else).I wish to make changes in the program.Is there any way i can edit the contents of the program using only the hex file,or like,is there a possibility of recovering the program using the hex file only?