WhatsApp Without Saving Number

Select Country Code and enter the desired WhatsApp Number.
[Optional] You may enter the desired message. In any case, you will get the opportunity to edit (if given here) the message or write a new message when WhatsApp opens.
Once you click on Start WhatsApp Chat button you will be redirected to a page that says -“Message [Number] on WhatsApp” where you need to click on Message if you are using the tool on PC/Mac. In case you are using it on a smartphone(iPhone or Android) browser, you will see a pop-up that says Open this page in WhatsApp. Tap on Open.
This will open WhatsApp app and you will get the conversation screen with the entered number. On a computer, there is one additional step.

On a computer, you will have to log in to WhatsApp Web if not done already. Follow the on-screen instructions to do so.
After you are logged into your WhatsApp account on the web, you will automatically be taken to the conversation screen with the number you entered in this tool. Next, all you need to do is chat.