What this task is for
This is a session review, not an identity check. You are looking at which clients are currently signed in to your LINE account and deciding, for each one, whether it should stay. The output is a short ledger: device name, how long it has been logged in, and keep or log out.
A separate question people often mix in is what strangers can see on your public profile, or which outside services you have authorized with LINE. Those are different lists, and the Devices screen does not answer them. Keep this review scoped to sessions so the result is something you can actually act on.
Step 1: Open the Devices screen
On your main device, go to Home > Settings > Account > Devices.
LINE’s Devices screen lists logged-in devices and how long they have been logged in, with controls to log out a selected device or all services. Source
The screen is a record of sessions, not a statement about who is using them. A device name and a login duration are facts about a connection; neither tells you the person, the location or the intent behind it. Treat each row as a lead to check against your own memory of where and when you signed in.
Step 2: Build the ledger
Copy the rows into a small table before changing anything. Writing it down first keeps you from logging out a session you actually need, such as a tablet you use for messages at home.
| Device name shown | Logged in for | Do you recognize it? | Decision |
|---|---|---|---|
| Example: a phone model you own | A duration that matches when you set it up | Yes | Keep |
| Example: a browser entry you do not recall | A duration you cannot place | Unsure | Check before acting |
| Example: a client you have never used | Any duration | No | Log out, then change password |
The rows above are hypothetical illustrations of the format, not records from a real account. Your own screen will show different names and durations.
Step 3: Understand what “LINE IAB” means
If one of the entries reads LINE IAB, that is LINE Internal App Browser — the browser built into the LINE app for opening links. It is not automatically an intruder. It can appear because you, or someone using your account, opened a web page from inside LINE.
LINE IAB means LINE Internal App Browser; LINE recommends logging out an unrecognized device and changing the account password. Source
So the label alone does not clear or condemn the session. Use the duration and your own recollection: if the timing lines up with a link you opened, it is probably your own activity. If it does not line up at all, treat it as unfamiliar and act on it.
Step 4: End the session you do not want
Once you have decided, use the controls on the same screen. You can log out a selected device, or log out all services if you are unsure about more than one entry.
- Logging out one device ends that session and leaves your other signed-in clients alone. Choose this when exactly one row is unfamiliar and the rest match your own use.
- Logging out all services ends every session, including the one on the device in your hand. Choose this when several rows are unfamiliar or you cannot place the timing. Expect to sign in again on your main device afterwards.
If a logout control does not respond or the row reappears after you refresh, do not assume the session is gone. Note the time, try again, and treat the password change in the next step as the more important action.
Step 5: Change your password after an unfamiliar session
Ending a session removes that login. It does not by itself explain how the login happened, so follow the documented advice and change the account password after logging out an unrecognized device.
A practical order that keeps you in control of your own account:
- Log out the unfamiliar session or all services.
- Change the password from your main device.
- Sign back in on the devices you are keeping.
- Reopen the Devices screen and confirm the ledger now matches what you expect.
- Keep your recovery details current, so a future password change does not lock you out.
Do not remove your own recovery method before you have finished signing back in. An account you cannot recover is a worse outcome than a session you have not yet closed.
What this review does not tell you
| Question | Does the Devices screen answer it? |
|---|---|
| Which clients are signed in, and for how long | Yes, that is what it lists |
| Who the person behind a session is | No — a device name or duration cannot identify a person |
| What your public profile shows to strangers | No — that is a profile visibility question |
| Which outside apps you have authorized with LINE | No — that is a separate authorization list |
| Whether an unfamiliar login was malicious | No — the screen shows sessions, not causes |
The last row matters most. An unfamiliar entry is a reason to act, not proof of anything. Equally, an entry you recognize is not proof that nothing else happened; the password change is what closes the gap.
Where a username lookup fits, and where it does not
TraceSeek is a separate app that searches publicly accessible profile candidates using a supplied username, across 3,000+ platforms. It cannot change LINE settings, log out sessions, recover a private account or verify anyone’s identity. A public username match is a lead, not proof of ownership.
That makes it useful for a different question: what public footprint exists under a name you already own or are authorized to review. It is not a tool for this screen. If your concern is a session on your LINE account, the steps above are the whole answer.
A checklist you can reuse
This is a proposed reader checklist, not a test we ran. Adapt it to your own devices.
- Open Home > Settings > Account > Devices on the main device.
- Write down each device name and login duration.
- Mark each row keep, log out, or unsure.
- Check whether a LINE IAB entry matches a link you opened.
- Log out the selected device, or all services if several rows are unclear.
- Change the password after ending an unfamiliar session.
- Sign back in on kept devices and re-check the list.
- Confirm recovery details still work before closing the task.
If you are reviewing sessions on more than one messaging app, the same keep-or-log-out logic applies elsewhere. For a parallel walkthrough on another platform, see review the related account task.