With the WhatsApp Web Plus extension you can send messages from the web platform without anyone seeing you online. In addition, you will be able to add that other users do not see when you are typing, know when a contact connects and much more.
In order to have the Invisible Mode in WhatsApp Web, it is necessary to follow the following steps:
From that moment no contact will see when you are online on WhatsApp Web.
Using this same extension you can also choose other interesting options such as: “Hide typing status” which is to hide when typing. Another possibility is “Notify about online contacts” which will notify you when the most recent contacts with whom you have exchanged messages are online. You can also put a password on the chats with "Enable Lock Screen - Set Passwords" and many more interesting options (customize the wallpaper, create stickers).