I accidentally deleted my chats! Can I get my messages back?

Summary

WhatsApp creates a backup copy of the chat history on your phone, and you can uninstall and reinstall WhatsApp to restore messages from this copy.

Note: after reinstalling WhatsApp you will not be able to access Voice Messages sent/received before the reinstall.

If you are unable to restore your chats, unfortunately, we can't restore your chats, contacts or multimedia files for you.

Details

The first step is to check the time that the last backup file was created. When a backup file is created, your existing WhatsApp chat history will be preserved in that file. Note that any messages that were deleted from your phone before that backup was created will not be restored.

To check the time of your last backup:

1. In the chats screen, tap on the three dots in the bottom right hand corner.
2. Tap settings > chat settings.
3. You can see the time of the last backup under backup (do not tap backup, otherwise a new backup will be created).

Then, uninstall and reinstall WhatsApp to restore that chat history backup.

When you reopen WhatsApp, you will be asked if you want to restore a chat history backup that was found. Choose yes.

Warning: you will lose all of the messages that you have sent and received since the backup was created.

We also suggest periodically exporting important chat histories to have copies saved outside of WhatsApp.

Cheers,
WhatsApp Support Team

source : whatsapp