If i offload what’sapp and reinstalled it the chats will deleted ?

Hello Timooon,

Thanks for participating in Apple Support Communities. We understand that you're wanting to know if you delete the WhatsApp app, will your chat history delete too. That's a great question! Deleting an app does delete the related data too. If you offload the app, the data remains. Those details can be found under "Use your device to check its storage" here: How to check the storage on your iPhone, iPad, and iPod touch

To be absolutely sure your chat history is safe, consider backing up your iPhone using iCloud. WhatsApp backs up your chat history using iCloud. More details about this WhatsApp feature, and how to back up using iCloud can be found in the following guides:

WhatsApp Support How to back up to iCloud

How to back up your iPhone, iPad, and iPod touch

We hope this helps. Have a great day!