First way, restore deleted WhatsApp history from iCloud backup
iCloud will save your WhatsApp chat history to your iCloud account, it will save the messages, picture but not the videos in order to save the space. To restore deleted WhatsApp chat history from iCloud backup, you must make sure the chat history is backed up. Check WhatsApp Settings>Chat Settings>Chat Backup to make sure the backup is exist. Then you can just uninstall WhatsApp and reinstall it from App store. After verifying your phone number, follow the notice on the screen you can restore your WhatsApp chat history! To recover deleted WhatsApp Messages History this way, below is the requirement:
WhatsApp version 126.96.36.199 or later.
iOS 5.1 or later.
Enough free iCloud space for WhatsApp Chat history like photos, voice message and audio notes.
Enough free space on your iPhone. You Have Backup Your WhatsApp History to Your iCloud.
The iPhone number used for backup and restore must be the same.
Second way, recover lost WhatsApp History with third-part iPhone data recovery software
This way can recover lost WhatsApp chat history in case you have not backup your iPhone WhatsApp messages to iCloud. You can directly recover like audio messages/notes, pictures, text messages and also the video files in your WhatsApp history without reinstall the WhatsApp.
Here are the steps to recover lost WhatsApp chat History.
Step 1, installed iPhone Data Recovery software Easeus MobiSaver on your computer (Here are 2 version of MobiSaver for Windows user and Mac user, please choose the right one for you). Connect your iPhone to your computer and choose “Recover from iOS Device” to scan your iPhone.
Step 2, after scanning, your can preview your WhatsApp history. Choose the messages you need and click “Recover” to restore your deleted WhatsApp chat history.