http://www.tenorshare.com/products/free-whatsapp-recovery.html - for Windows
http://www.tenorshare.com/products/free-whatsapp-recovery-mac.html - for Mac
"Instantly and Easily Retrieve Lost WhatsApp Messages, Photos, Videos
Inadvertently deleted iPhone WhatsApp messages? iOS 7.1 ate all your WhatsApp chats after update? All WhatsApp chat history was wiped during jailbreak? Well fear not. Use Tenorshare Free WhatsApp Recovery. It can free recover and extract WhatsApp chat history (including photos, videos and other message attachments) on iPhone, iPad and iPod that were lost due to deletion, failed iOS update or jailbreak, and etc.
- It’s 100% free of charge.
- Retrieve WhatsApp messages either from iTunes backup or directly from device.
- Manage WhatsApp chats by extracting, exporting and backing up from device to computer
- Recover both individual conversions and group conversions
- Support all iOS devices: iPhone 5s/5c/5/4s, iPad Air/mini 2/4/mini, iPod Touch 5/4"