How to Use WhatsApp on Your PC and Two Phones

Your WhatsApp account does not have to live only on your phone. WhatsApp’s multi-device feature lets you use the same account on your computer (through a web browser or the desktop app) and on up to four companion devices — including a second phone — all at the same time. Every chat, photo, and voice note stays end-to-end encrypted, and messages sync across everything you have linked. Your main phone does not even need to stay online for the others to keep working.

This guide covers the whole setup: what multi-device actually is and its limits, linking your PC via WhatsApp Web, installing and linking the desktop app for Windows and Mac, linking a second phone in companion mode, how syncing and notifications work across devices, managing and logging out of linked devices remotely, and the security habits that keep your account safe on shared computers.

Part 1: Understand Multi-Device — What It Can and Can’t Do

Before you scan anything, it helps to know the rules WhatsApp sets for linked devices.

The basics

• One account = one phone number. Your WhatsApp account is tied to a single phone number, and you can only have one primary phone — the phone where your number is registered. You cannot register the same number as the primary device on two phones at once.
• Up to 4 companion devices. On top of your primary phone, you can link up to four companion devices — any mix of computers (WhatsApp Web sessions, desktop apps) and additional phones or tablets. So “your phone + PC + second phone” fits comfortably inside the limit.
• Your main phone can be offline. Once devices are linked, each one connects to WhatsApp’s servers independently. If your primary phone runs out of battery or loses its connection, your PC and second phone keep sending and receiving.
• The 14-day rule. If your primary phone stays inactive (no WhatsApp use) for more than 14 days, all linked devices are automatically logged out for security. Using WhatsApp on the phone even briefly resets the clock.

What syncs — and what doesn’t

• Chats and media sync across devices, and everything stays end-to-end encrypted. Each linked device has its own encryption keys, and WhatsApp cannot read your messages.
• Chat history transfers to a newly linked companion device when you link it — recent messages come over first, older ones follow. On a brand-new second phone, the full history can take a while to arrive on a slow connection.
• Some features are phone-only. You cannot broadcast lists from linked devices in some versions, delete your account from a companion device, or change your phone number there — account management happens on the primary phone.
• Call quality is best on the desktop app or phone; WhatsApp Web supports voice and video calls, but the desktop app is more reliable for long calls.

Worth knowing: companion devices use the same WhatsApp number and profile as your primary phone. People you message see no difference — your name, photo, and number are identical everywhere.

Part 2: Link Your PC With WhatsApp Web

WhatsApp Web is the fastest way to get WhatsApp on a computer — no install, just a browser. It works in Chrome, Edge, Firefox, Safari, and most modern browsers.

Step 1: Open WhatsApp Web on your computer

1. Open your browser and go to web.whatsapp.com.
2. The page shows a large QR code on the left and instructions on the right. Leave this tab open.

Tip: bookmark the page now so you can get back to it in one click later.

Step 2: Open Linked Devices on your primary phone

• On iPhone: open WhatsApp, tap Settings (bottom-right), then tap Linked Devices.
• On Android: open WhatsApp, tap the three-dot menu (top-right), then tap Linked Devices.

Step 3: Scan the QR code

1. On the Linked Devices screen, tap Link a Device.
2. Unlock your phone if asked (fingerprint, face, or PIN — this is a security check).
3. Your camera opens. Point it at the QR code on your computer screen so the code sits inside the frame.
4. Within a second or two, WhatsApp Web logs in and your chats appear.

If the QR code won’t scan:

• Make sure the whole QR code is inside the camera frame and the computer screen is not reflecting a lamp or window.
• Click the QR code on the computer to refresh it — codes expire after a while.
• Increase your screen brightness a notch; dim screens scan poorly.

Using WhatsApp Web day to day

• Click any chat to open it, type in the message box at the bottom, and press Enter to send. Shift + Enter starts a new line without sending.
• Attach files with the + (plus) button next to the message box — photos, videos, documents, and contacts.
• Start a voice or video call from any chat with the phone and camera icons at the top of the chat window.
• Open the three-dot menu (or your profile picture) for Settings, where you can change Notifications, chat wallpaper, and turn on dark mode.

Log out of WhatsApp Web

Never leave your account logged in on a computer you don’t own. Two ways to log out:

1. From the computer: click the three-dot menu above your chat list, then click Log out and confirm.
2. Remotely from your phone: go to WhatsApp > Settings > Linked Devices (iPhone) or three-dot menu > Linked Devices (Android), tap the device session (it shows the browser and computer name, e.g. “Chrome (Windows)”), then tap Log Out.

The remote method is your safety net — if you ever forget to log out on a shared or work computer, you can kill the session from your phone in seconds.

Part 3: Install the WhatsApp Desktop App (Windows and Mac)

WhatsApp Web is convenient, but the desktop app is better for daily use: it starts with your computer, handles calls more reliably, and gives you proper desktop notifications.

Download and install

1. On your PC or Mac, go to whatsapp.com/download in your browser.
2. Download the installer for Windows or Mac.
3. Run the installer and follow the prompts. On Windows you can also install it from the Microsoft Store; on Mac, from the App Store — the store versions update themselves automatically.

Link it to your account

Linking works exactly like WhatsApp Web:

1. Open the newly installed WhatsApp app. It shows a QR code.
2. On your primary phone, open WhatsApp > Settings > Linked Devices (iPhone) or the three-dot menu > Linked Devices (Android).
3. Tap Link a Device, unlock your phone, and scan the computer’s QR code.
4. Your chats sync into the desktop app — give it a minute on first launch if you have years of history.

Desktop app tips

• Keyboard shortcuts speed things up: Ctrl + N (new chat), Ctrl + Shift + ] / [ to jump between chats, Ctrl + E to archive a chat, Ctrl + Shift + M to mute a chat (on Mac, replace Ctrl with Cmd).
• In Settings > Notifications, choose whether message previews show on the lock screen — turn previews off if coworkers can see your screen.
• The app can start automatically when your computer boots (toggle in Settings) so you never miss messages.
• Voice and video calls go through the phone and camera icons in a chat, just like the phone app. A headset makes a big difference for call quality.

Part 4: Link a Second Phone (Companion Mode)

This is the feature most people don’t know exists: you can link an additional phone to your WhatsApp account, so both phones send and receive as the same number. Useful if you carry a work phone and a personal phone, or want WhatsApp on a phone without moving your SIM.

Before you start

• The second phone needs the latest version of WhatsApp installed — update it from the Play Store (Android) or App Store (iPhone) first.
• Keep your primary phone nearby — you’ll scan a QR code with it, same as linking a computer.
• Both phones need an internet connection (Wi-Fi is fine; the second phone does not need your SIM card or your phone number).

Link the second phone step by step

1. On the second phone, open WhatsApp.
2. Instead of entering a phone number, tap Link as companion device (on some versions this appears as a three-dot menu > Link as companion device on the welcome screen).
3. A QR code appears on the second phone’s screen.
4. On your primary phone, open WhatsApp > Settings > Linked Devices (iPhone) or three-dot menu > Linked Devices (Android).
5. Tap Link a Device, unlock your phone, and scan the QR code shown on the second phone.
6. The second phone logs in and your chats begin syncing. Recent chats appear first; older history and media keep arriving in the background.

What to expect on the companion phone

• It works like a full WhatsApp: send and receive messages, photos, voice notes, and calls, all as your number.
• Notifications arrive on both phones. If double notifications annoy you, mute WhatsApp notifications on one of them in the phone’s system settings.
• The companion phone counts as one of your 4 companion devices — remember the limit if you also link a PC and a tablet.
• To unlink it later, go to Settings > Linked Devices on your primary phone, tap the second phone’s session, and tap Log Out — or open WhatsApp > Settings on the companion phone itself and choose Log out.

Tablets work the same way: install WhatsApp on an Android tablet or iPad, choose the link-as-companion option, and scan with your primary phone.

Part 5: Keep Everything in Sync and Under Control

With two or three devices on one account, a little housekeeping keeps things smooth.

Managing linked devices

Your primary phone is the control center:

1. Open WhatsApp > Settings > Linked Devices (iPhone) or three-dot menu > Linked Devices (Android).
2. You see every linked session with its device type, browser or app name, and last-active time — for example “Chrome (Windows)” or “WhatsApp for Mac” or your second phone’s model name.
3. Tap any session to see details, and tap Log Out to end it remotely.

Make this a monthly habit. If you see a device you don’t recognize — a browser you never used, a phone model you don’t own — log it out immediately and then check Part 6’s security steps.

Notifications across devices

• Each device has its own notification settings. On your PC, open Settings > Notifications in WhatsApp Web or the desktop app to control sounds, banners, and message previews.
• Mute noisy group chats on every device where they bother you — muting on one device does not mute on the others in all versions, so check each.
• On a shared computer, turn off lock-screen previews so message text doesn’t pop up where others can read it.

Storage and performance

• Media you receive downloads on each device separately. If storage is tight on the PC, use WhatsApp Web instead of the desktop app (the browser version stores less locally).
• On the companion phone, go to Settings > Storage and Data > Manage Storage to review what’s eating space, same as on your primary phone.
• If one device feels sluggish or messages seem delayed, log out and re-link that device — it forces a fresh sync and fixes most glitches.

Calls on multiple devices

• An incoming WhatsApp call rings on all linked devices at once — answer on whichever is closest.
• You can only be in one call at a time; answering on your PC silences the ring on your phones.

Part 6: Security Habits for Multi-Device WhatsApp

More devices means more doors into your account. These habits keep them all locked.

Guard the QR code step

• The QR code on web.whatsapp.com or the desktop app is the key to your account. Only ever scan it with your own primary phone, and never scan a QR code someone sends you or shows you on their screen — scanning an attacker’s code links your account to their device.
• Only open WhatsApp Web from web.whatsapp.com typed by you or from your bookmark. Fake lookalike sites exist to steal sessions — check the address bar.

Lock every device

• Set a screen lock (PIN, fingerprint, or face) on your PC, second phone, and tablet. An unlocked computer with WhatsApp Web open is an open inbox.
• On a shared or work computer, log out of WhatsApp Web when you finish — or at least lock the computer (Windows + L / Ctrl + Cmd + Q on Mac) whenever you step away.
• Enable two-step verification on your primary phone: WhatsApp > Settings > Account > Two-step verification > Turn on. This PIN protects your number if someone tries to re-register it.

Watch for intruders

• Check Linked Devices regularly (Part 5). Unknown session? Log it out right away.
• If messages you didn’t send appear, or chats are marked read that you never opened, assume a linked device is compromised: log out all sessions from Linked Devices, then re-link only the ones you use.
• WhatsApp will notify you on your primary phone when a new device is linked — if you get that notice and it wasn’t you, act immediately.

Backups stay phone-side

• Chat backups (to Google Drive on Android or iCloud on iPhone) are managed on the primary phone only: Settings > Chats > Chat backup. Companion devices don’t need separate backups — but keep the primary phone’s backup running so a lost phone doesn’t mean lost history.

Troubleshooting

• “The QR code won’t scan.” Clean the camera lens, fit the whole code inside the frame, kill screen glare, click the code to refresh it if it’s been sitting a while, and bump up the computer’s brightness. If it still fails, restart both the browser/app and the phone.
• “WhatsApp Web says ‘Phone not connected’ but my phone is online.” This message is a leftover from the old days — modern multi-device works with the phone offline. Refresh the browser tab (Ctrl + R / Cmd + R); if it persists, log out and re-link the session.
• “My chats aren’t syncing to the second phone.” Give it time on first link — history arrives newest-first and can take a while on slow Wi-Fi. Check both phones are on the same updated WhatsApp version, then try logging the companion phone out and re-linking.
• “I can’t find ‘Link as companion device’ on the second phone.” Update WhatsApp on that phone to the latest version first — older versions don’t show the option. It’s on the welcome/registration screen, sometimes under the three-dot menu. If the phone previously had WhatsApp registered with another number, you may need to reinstall the app to see the linking option.
• “I hit the 4-device limit.” Open Linked Devices on your primary phone and log out old sessions you no longer use — forgotten browser logins on old computers are the usual culprits. Each logout frees a slot immediately.
• “Messages send from my PC but arrive late on my phone.” Check the phone isn’t in battery-saver or data-saver mode restricting background data, and that WhatsApp is excluded from battery optimization (Settings > Apps > WhatsApp > Battery > Unrestricted on Android).
• “I forgot to log out on a public computer.” Don’t panic — open Linked Devices on your primary phone, find the session (check the browser name and last-active time), and tap Log Out. The remote session dies instantly.
• “Someone linked a device without my permission.” Log out all linked devices from your primary phone immediately, enable two-step verification (Settings > Account > Two-step verification), and consider re-registering your number if you suspect your SMS codes were intercepted.
• “Calls work on my phone but not on WhatsApp Web.” The browser needs microphone and camera permission — click the lock/padlock icon in the address bar and allow both, then reload. For the desktop app, check your system’s privacy settings allow WhatsApp to use the mic and camera. A wired headset usually fixes echo and mic issues.
• “WhatsApp Web logs me out every time I close the browser.” Your browser is probably clearing cookies/site data on exit. In browser settings, add web.whatsapp.com as an allowed site that keeps its data, or disable “clear cookies on exit.”

Quick Checklist

• Confirm your setup fits the limits: 1 primary phone + up to 4 companion devices (PC, second phone, tablet — any mix).
• Link your PC via web.whatsapp.com (quick) or the desktop app from whatsapp.com/download (better for daily use and calls).
• Link a second phone with Link as companion device on its welcome screen, scanned from Linked Devices on your primary phone.
• Bookmark web.whatsapp.com and turn off lock-screen message previews on any shared computer.
• Review Linked Devices monthly; log out anything you don’t recognize immediately.
• Enable two-step verification under Settings > Account on your primary phone.
• Remember the 14-day rule: use WhatsApp on your primary phone at least once every two weeks or linked devices get logged out.
• If you ever leave a session behind on someone else’s computer, kill it remotely from Linked Devices.

Once your PC and second phone are linked, WhatsApp stops being a phone-only app and becomes wherever you are — scan once, and you’re set.