A free program for Android, by WhatsTool Tech: Toolkit for Business WhatsApp.

With the help of WhatsTool, you can do the following things on WhatsApp:

Import contacts from your phonebook to WhatsApp.

Send personalised and stylish messages with photos and videos.

Track progress of campaigns.

Direct chat with unsaved numbers.

Quick reply to messages.

Download status and videos from friends.

Split videos to fit the WhatsApp status video time limit.

Generate WhatsApp chat reports.

Recover deleted messages.

How to Use WhatsTool

First, install the app on your device from Google Play.

Now, download the CSV file from your phonebook or from the online directory.

Open the CSV file and import the contacts to the app.

Now, you can send bulk messages to your contacts on WhatsApp.