WhatsApp has a feature that allows you to delete your account. The link to this feature is found in the app’s settings section.
To delete someone else’s WhatsApp, you need to have their phone number. If you do not know the phone number, there is no way to delete the account from your device.
Open the WhatsApp app. Tap on the “Menu” button at the top-left corner of the screen. On iPhone, this is the three horizontal lines; on Android, this is the hamburger menu icon. From there, tap on “Settings.” Scroll down and select “Account.” Tap on either “Delete my account” or “Sign out,” depending on your device. Confirm your choice by tapping “Yes.
If you are the account holder, you can delete your own WhatsApp account. If you are not the account holder, there is no way to delete someone’s WhatsApp account.
To delete messages for both sides in WhatsApp, you’ll need to delete them individually.