把手机里的对话
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WhatsApp Web opens inside a tab, so you do not install anything and you sign in by pairing with your phone. The desktop application is installed on the machine and can keep its own session, which is more convenient if you open it every day. Both rely on the same account, so messages you send from either place appear on the others. Feature availability can differ between the two, so check the current interface or official help centre before relying on a specific option.

Historically the browser session depended on the phone being connected, and that expectation still guides how many people use it. Current versions support linked devices that can keep working for a period without the phone nearby, but the exact behaviour depends on your version and settings. The safe habit is to keep the phone reachable when you start a session, and to confirm what your own account allows rather than assuming either extreme.

Open the web page on your computer, then on your phone go to the linked devices section of the app and choose the option to link a new device. Point the phone camera at the code shown on the screen and confirm the pairing. Keep the phone on the same account you want to use, and complete the step in one sitting because the code expires after a short while. If pairing fails, reload the page and generate a fresh code.

Yes, but not at the same time in one session. Each person links their own account, and you should sign out of the previous session before handing the machine over. On shared or public computers, signing out is not optional: it removes the linked session from that browser. Also clear the browser profile if you used a private window, otherwise a later user may find a saved session waiting for them.

Sessions expire for several reasons: you cleared browser data, the browser updated, you signed out on the phone, or the account was removed from the linked devices list. Re-linking is the normal fix. If it happens repeatedly, check whether your browser is set to delete cookies on exit, and whether the machine has multiple profiles. Re-linking takes under a minute and does not delete any messages.

Files travel through the same service as messages on your phone, so the practical question is who else can reach the computer. On a personal machine that you lock when away, sending documents is ordinary use. On a shared machine, avoid opening sensitive files in a session others can see, and sign out when finished. Do not treat any chat tool as a substitute for a controlled channel when the material is confidential.

Start with the simplest checks: reload the page, confirm the computer has a working connection, and verify the phone still shows the device as linked. If the phone was offline for a long time, give it a moment to reconnect. When none of that helps, sign out of the browser session and link again. Persistent problems usually sit with the account or the network, not with the page itself.

It depends on the policy of the organisation that manages the device. Some workplaces block personal messaging services at the network level, and some prohibit linking personal accounts on company hardware. Before you sign in, read the acceptable-use rules or ask the person responsible for IT. If the answer is no, the honest option is to keep that conversation on your own phone rather than find a workaround.

The browser holds session data so you do not have to pair again every time, and that data lives on that computer. It is not a separate archive you can browse independently of the account. If you want the session gone, sign out and clear the site data. On a machine you do not control, assume that anything left behind could be seen by the next person.

Yes. The wide screen puts the conversation list beside the active chat, which makes scanning and replying faster during desk work. Some features arrive on one platform before another, and menu names can differ slightly. If you cannot find something, compare the current interface on both devices before concluding that the feature is missing, because labels and positions change between releases.