WhatsApp web is not also available for the iPhone users. For a while, Facebook-owned WhatsApp had been ignoring the iPhone users. The WhatsApp app was available to them, but WhatsApp web never supported the iPhone. The web works with various mobile platforms like BlackBerry and Android, except iPhone.
So, if you owned an Apple smartphone, then you might have to stick to the mobile app for chatting with friends on WhatsApp. But now, millions of iPhone users would use WhatsApp in their web browser.
Last January, WhatsApp web was made available to Android, Windows Phone and Blackberry users. However, it is now also available to the iOS users. The WhatsApp web mirrors your messages and conversations to your web browser from the mobile device. This way, you can use WhatsApp from your desktop.
How to Connect?
First of all, it is important to download Google Chrome browser on your PC. With this only you will be able to connect to WhatsApp web client from your web browser.
After launching the Google Chrome, just go to https://web.whatsapp.com. Here, on the site, you will see a QR code is appearing. Right at that moment, open WhatsApp on your mobile phone and go to Settings. Find WhatsApp Web there. The app should launch a scanner for the QR code scanner or will give you the way to start scanning.
After scanning the QR code shown on WhatsApp web, you will get paired with the WhatsApp web client.
If any problem occurs at any point, then make sure that your phone has the latest version of WhatsApp installed on it.