Follow these steps to completely remove your data and account from Evernote.
1) (if applicable) Cancel your Evernote Premium subscription. If you are paying for Evernote Premium, you will need to cancel your subscription via the service through which you subscribed. See full details about managing your subscription in this article.
2) Delete all your notes. Open your Notes list, select all notes and delete them, then select the Trash and Empty the Trash. We do not keep your information on file once you have deleted it from the system. Any data you choose to keep is your choice, for any future access should you decide to reactivate.
3) (optional) Remove your email address from our database. Should you wish your email address removed from our database, simply change your email address to a fake email address in the user settings before deactivating your account. Your old address will be entirely removed from our system after backups are overwritten (around 2 weeks). We do keep your username available for you so that no one else may register it, as we have had people complain that they have deactivated their accounts by accident, but lost their username due to someone else taking it in the meantime.
4) Deactivate. To deactivate your Evernote account, log in to Evernote Web and click the "Deactivate Account" link in the Settings area. You'll need to confirm the deactivation on the next page. Note that Evernote doesn't automatically delete notes when an account is deactivated.
To reactivate an inactive account, just login using the inactive username and password, then follow the instructions.