WA Number Checker is a free Chrome extension developed by mister.aaar that allows users to easily check if a phone number has WhatsApp enabled. This handy tool helps users identify which numbers can receive WhatsApp messages and which ones cannot. Additionally, it provides information on whether the number is associated with a business account.

To use WA Number Checker, simply log in to "web.whatsapp.com" and activate the extension. Then, enter a list of phone numbers in the input area provided on the left and click the "Check" button. The results will be displayed on the right, and you can choose to view them in CSV or JSON format. With just one click, you can copy or download the results.

It's important to note that you must be logged in to your WhatsApp Web for the extension to work. Please be aware that WA Number Checker is not endorsed or certified by WhatsApp Inc. It is an unofficial enhancement tool for WhatsApp Web and should not be used against WhatsApp Inc's policies.