"Select All" from Contacts in WhatsApp In WhasApp, is there any button for "Select All" from Contacts; in order that one single message goes to all?
Well, nope there isn't any select all option available over the WhatsApp, rather than it has the feature called Broadcast messages !

To Broadcast the message:


  
  Open up WhatsApp. 
  Tap over the three dots available on top right side of the screen. 
  Now Select the option "BroadCast Message".
  Tap over the + button to add recipient name over the Broadcast list.
  Next thing to do is tap over the continue button.
  


Like, the above user said that, presently it has a limit of 256 broadcast limit. 

You can also refer to the WhatsApp Support Section for the same.