What the other person actually sees when you share your screen
People share a screen intending to show one thing and show considerably more. The leaks are predictable, and almost all of them are preventable in about thirty seconds of preparation.
Everything that arrives uninvited
- Notifications, with their content. The banner that slides in during the session is captured exactly as it appears — including the first line of a message, a verification code, or the name of the person contacting you. This is the single most common leak.
- Keyboard suggestions. The predictive strip above the keyboard offers words drawn from what you have typed before. It is visible to the viewer and it is not always innocuous.
- Autofill prompts. Your saved addresses and card details appear as a suggestion popup, which the capture includes.
- The app switcher. Opening recents shows a snapshot of every app you have open. People do this without thinking mid-session.
- Anything behind the app you meant to share, if you shared the entire screen rather than a single app.
- Your lock screen, if the session outlives your attention. Lock screen notifications are visible on the lock screen for a reason, and they are equally visible in a capture.
What appears black, and why
Some screens arrive as a black rectangle in a capture. This is not a fault — it is FLAG_SECURE, a flag an app sets on a window to declare that it must not be screenshotted or recorded. Android enforces it at the system level, so no capturing app can work around it.
Typically flagged: banking and payment apps, password managers, some messaging apps' authentication screens, and DRM-protected video. If you are trying to show someone your banking app and they see black, that is the app protecting you, and the fix is not a different screen sharing tool.
Thirty seconds of preparation
- Turn on Do Not Disturb. One switch that removes the largest category of leak entirely.
- Share one app rather than the whole screen, if you are on Android 14 or later. The system dialog offers it and almost nobody notices.
- Close what you do not want seen before you start, not after. The recents screen remembers.
- Check the notification preview setting if you share often: Settings → Notifications → set sensitive content to be hidden on the lock screen, and consider hiding content in banners too.
- Say out loud when you are about to switch apps. Not a technical control, but it stops the "wait, do not open that" moment.
The part that is not technical
A screen share is a live view, so the person watching sees your speed, your typos, and what you look at before you decide. That is fine among people who know each other and less fine in a support context with a stranger. Two habits help: decide in advance what you are going to show, and end the session when that is done rather than leaving it running while you talk.
And be clear about who is watching. A one-to-one session is different from one being recorded or shown to a room, and it is entirely reasonable to ask which one you are in before you start.
More guides
Where your screen actually goes during a session
Signalling, direct connections and relays each see something different. What is encrypted, what leaks as metadata regardless, and the question that separates products.
Screen recording and screen sharing are not the same decision
One produces a file that outlives the moment; the other does not. What changes when a session is recorded, who is allowed to record whom, and the consent that matters.
Casting to a TV, mirroring to a PC, or remote sharing: three different things
Chromecast, Miracast, a USB cable and a remote session solve different problems. Which one needs the same room, which needs the same network, and which needs neither.
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