Third-party wrappers remember your login (via token storage) so you don't have to scan the QR code daily. They also support dark mode and desktop notifications without hogging your browser tabs.
Tap (iOS) or the three-dot menu (Android) and select Linked Devices . Point your phone camera at the QR code on your Mac screen. Why this works best for Catalina:
The most reliable way to use WhatsApp on macOS 10.15.7 is through your web browser. Official Link: web.whatsapp.com Browser Support: Google Chrome (version 85+), Microsoft Edge
Your chats will sync in real-time. You can now send messages, images, videos, and documents directly from your Mac running 10.15.7.
WhatsApp automatically logs out inactive web sessions after 14 days for security. Additionally, if you clear browser cookies, you’ll be logged out.