How to Record Audio With the Screen Off or Locked

One of the most common frustrations with phone recorders: you start a recording, the screen turns off to save power, and capture quietly stops. The good news is that recording with the screen off is entirely possible — the screen and the microphone are independent, and the right app keeps the mic running while the display sleeps.

Why recordings stop when the screen sleeps

It's not the screen turning off that stops recording — it's how the *app* is built and how the OS treats it. Two things cause silent stops:

• No background-audio support. Basic recorders only run while on screen. When the display sleeps and the app is backgrounded, they stop.
• Battery optimization (Android) or Low Power throttling (iOS). The system suspends background apps to save power, cutting capture short.

A recorder designed for all-day use avoids both: it declares an audio background mode and runs persistently so the locked screen doesn't matter.

How to keep recording with the screen off

1. Use a background voice recorder like BlackBox, not a basic memo app.
2. Grant microphone permission (and notifications on Android).
3. On Android, set battery usage to Unrestricted; on iPhone, avoid Low Power Mode during long sessions.
4. Press Start, then lock your phone normally. Recording continues.

Bonus: a locked screen is the *most* battery-efficient way to record. The display is the biggest power draw on a phone, so screen-off recording actually extends how long you can capture.

Platform-specific steps live in our guides for iPhone and Android.

Confirm it actually works on your phone

Background behaviour varies by manufacturer, so verify before you rely on it:

1. Start a recording.
2. Lock the phone and leave it for five minutes.
3. Unlock, open the recorder, and check that the file covers the full five minutes.

If it does, you're set for hours of screen-off capture.

The bottom line

The screen turning off should never end your recording. With a recorder built for background capture and battery optimization handled, your phone keeps listening with the display dark — saving power while it does. BlackBox is designed to record reliably with the screen off, all day if you want.