You can download the WhatsApp app for Mac or Windows. WhatsApp has a clean interface and also comes with calling features, just like the smartphone app.

Whether you download WhatsApp from the Microsoft Store or the Mac App Store, the setup process mostly remains the same.

Set up WhatsApp desktop using your Android phone

1.  Open WhatsApp on your desktop or Mac running macOS.

2.  On your Android phone, open WhatsApp, and then go to the three-dot menu (⋮) in the upper-right corner and select Linked devices.

3.  Tap the Link a device button, authenticate your identity, and point your phone at the QR code on your desktop or laptop screen.

4.  After you've done that, and after some loading, your WhatsApp messages appear on your computer.

5.  You can repeat the process on four other devices, letting you text from all of them simultaneously.

Set up WhatsApp desktop using your iPhone

Since WhatsApp for iOS uses a different interface, the steps to change a QR code vary on it.

1.  Open the WhatsApp mobile app on your iPhone and go to Settings.

2.  Select Linked Devices.

3.  Tap Link a Device.

4.  Authenticate with Face ID or Touch ID and scan the QR code using the default camera.

Use WhatsApp Web

WhatsApp works through your web browser, such as Google Chrome, and doesn't need to be installed. It's convenient if you use a work computer and your administrator doesn't allow you to install apps. It's also perfect if you use a Chromebook or a Linux-based system.

Here's how to set up WhatsApp on the web.

1.  Visit web.whatsapp.com on your preferred desktop browser.

2.  Open the Linked Devices menu on your Android or iPhone (check the steps above).

3.  Capture the displayed QR code on the screen.

4.  Turn on notification permission for WhatsApp. Click the lock icon in the address bar and open Site settings.

5.  Expand Notifications and select Allow.

WhatsApp for desktop features

WhatsApp for desktops isn't an afterthought from the company. It's packed with useful features.

• Make voice calls with up to 32 people and video calls with up to 8 people simultaneously.
• Excellent support for keyboard shortcuts to navigate the app like a pro.
• Pin up to three important chats at the top.
• Check communities and view status updates.
• Stickers, GIFs, and voice messages support.
• Access all privacy options (unavailable on new WhatsApp apps).
• Rich theme support.
• View your entire WhatsApp call history.
• Join the group call after it has started.
• Receive notifications even if your phone is offline.
• Share media and documents by simply dragging and dropping into a chat.

Source: Android Police - https://www.androidpolice.com/use-whatsapp-windows-macos-computer/