how to hide data behind image

first select the image file behind which you want to hide your data and the 

data you will hide and take it to

another folder or you keep it in same folder

 here i am keeping it on new folder

then compress the file you want to hide but remember the extension .zip or

 .rar

and remember the extension of the image file

now open cmd and write d: if your disk name is d you can give it any name

my one id d if your file is in c drive the write cd/

now write cd name of the file where your data is as given below

cd newfolder

then write the code

 ''copy/ b nameoftheimagefile.extension + nameofthecompressedfile.extension

 nameoftheimagefile.extension ''  

like this ''copy/ b ole.jpg + cheat.rar ole.jpg'' without quotes and hit enter

thats it you have hidden your file

size of the image before hiding

size after hiding