You can’t actually change your friend’s WhatsApp Profile Pic from your phone globally but you can change it for your phone so that whenever someone will check it on your WhatsApp, he/she will see your assigned profile pic for that friend. So, it would be a great way to makefun of your friends.
To do this, follow these steps:
*.Download weird-looking/funny picture that you want to assign for your friend’s WhatsApp profile pic.
*.Resize it to 561 x 561 pixels and name it with your friend’s mobile number from which he use WhatsApp.
*.Save the image to SD Card>>WhatsApp>>Profile Pictures. Overwrite existing file (if required).
*.Now, show you friend his profile pic fromyour WhatsApp to invite instant panic to his face.
Note – Disable WiFi/Data connection so that WhatsApp will not automatically update the pic.