How to Transfer WhatsApp Messages or Chat History from iPhone to a Computer
How to Export and Back Up Your WhatsApp Chat History
How to save a WhatsApp chat to PC or Mac
5 Smart Ways to Export WhatsApp Chat to PDF [iOS/Android]
Make sure you have enough iCloud space to back up WhatsApp data.
You can choose one place to save your backup files.
How to create PDF in WhatsApp through PDF Share? After that, you will see iTunes backups stored on your computer.