How to define a custom sound for Whatsapp? When receiving mails or a whatsapp message, the same sound notification is played. I want to be able to tell those events apart and would like to define custom sounds. How can I achieve this?

I really would like to avoid a third party application, or if there are no other ways, I prefer a paid app over one with advertisement.
Open WhatsApp, either press the ... overflow button in the top right corner of the screen, and select Settings, or press your phone's Menu button, and then select Settings.



Then select Notifications, which should be the bottom option on the list at the moment, and tap Notification Tone. This will let you browse to find another sound file to use for your WhatsApp notifications.