WACopyMate

WACopyMate is a dead simple Chrome extension to copy contact numbers from chats on WhatsApp Web in 1 click. With this, you will not have to manually copy numbers, remove spaces, and remove parenthesis. Just tap on the extension's icon in the toolbar to copy number of the contact in currently opened chat.

For unsaved contacts, there is no need to do anything extra. Just open the chat and click on the extension's icon to copy the phone number to clipboard.

To copy number of a saved contact, you need to click on contact's profile once and when the contact info sidebar appears, click extension's icon to copy the phone number to clipboard.

By default, it will skip the country code. But if you want country code to be included in the number then, go to options page of the extension and then check "Include Country Code" checkbox.