How Can I Delete All Gmail Emails at Once

Proceed with the steps given below to delete all your Gmail email messages.

Launch your browser and enter the official Gmail website in the address bar.
Log in using your Gmail username and password.
Navigate to the All Mail folder in the older version site, and click on the Select icon to select all the 50 email messages displayed on the screen.
Click the Delete icon to remove all the selected emails.
Select Yes when prompted for confirmation to delete the mails.
Repeat the procedure for all the 50 emails on the screen for delete all Gmail Emails at once.
Click on the link on the top of the screen mentioning, “Select all the conversations that match this search.” Then, click on the Delete icon.
Enter the following in the Search section “Before:2020/03/03” and enter the current date in the date mentioned above.
Select all your emails and click on the Delete icon.
All emails from the Primary, Social, and Promotions folder will be deleted.
To delete the messages from the Spam folder, open the Spam folder and select all the messages, and click on the Delete button.
If you want to recover any deleted emails, go to the Trash folder and search for your email and retrieve it.
Select the mail which you want to recover and select the Move to Inbox tab.

Deleting Gmail emails from the Gmail application:

Open the Gmail application from your smartphone.

Enter the email address and password of your Gmail account. Then, tap on the Sign In button then to delete all Gmail Emails at once.

Go to the Inbox folder in your Gmail account.

On the top-left corner of the screen, tap on the Menu icon.

Select the down-arrow tab showing All Mail. Then, tap on the Edit option and touch Select All.

Now, select all conversations and tap on the Delete icon.

All the selected emails will be removed from your Gmail account ie, delete all Gmail Emails at once.

How to Delete All Gmail Emails at Once