A free program for Android, by SAB Technologies.
The WhatsDelete Message and Photo Recovery app is designed to restore deleted messages from the messaging app. If you want to view all of your deleted messages from Whatsapp, you can download this app and restore them. With it, you will get all your deleted messages back, even if your friend deletes them before you can see them.
To use this app, first you will need to download it. After that, open it and you will see a screen that will ask you to choose a backup method. You can use one of the two options that are available. The first one is the backup of all your chats. After that, you can choose the one you want to restore and click on the Restore button.
