hide a massage behind any image or file(stenography)

step1:
open notepad and write down secret msg.
step2:
save it.
step3:
open command prompt and write down
copy /b image_name.jpg+secret.txt new_image.jpg
example: copy \b malika.jpg+sajani.jpg sajanifinal.jpg
step4:
enjoy your communication

note:
1.file format should be same of source image and final image .
2.open file with notepad and msg will be end of file you can search string.