To send WhatsApp messages in bulk on Windows you typically need a third-party bulk sender application, since the official WhatsApp API has strict limitations and is not intended for general mass messaging. These desktop tools provide a graphical interface that lets you log in with your WhatsApp account (via QR code), import a list of numbers, compose your message, and then broadcast it to all selected contacts or groups.
A typical workflow looks like this:
Install the program on Windows and connect your WhatsApp account.
Import contacts (from CSV/Excel or extracted group members).
Write your message (text, media, or templates).
Start the campaign and monitor the delivery reports.
Eg:Whatsapp Bulk Sender + Group Sender + Auto Reply App
bit.ly/wabulksenderresell