How to Adjust and Test Microphone Gain on Android

Android handles microphone level differently from desktop systems. Most phones have no system-wide input level slider. The volume buttons change output volume for media, ringtones and calls, not how loudly the microphone records. Input gain is usually set automatically by the recording app or the phone's audio processing. Manual control exists only where a specific app or device manufacturer provides it.

Before you start

The app you record or call in decides how the microphone level is handled, so start with that app. Check these prerequisites first:

• The app has microphone permission. You can review this in the app's permission settings in Android Settings. On Android 12 and later, also make sure the system-wide microphone access toggle has not turned the microphone off.
• You know which input device is in use: the built-in microphone, a wired headset, a USB-C microphone or a Bluetooth headset. Android usually switches automatically when you connect an accessory.
• The phone's microphone openings are clear. Cases, screen protectors and dust can partly cover them.
• You know where the audio is processed. Recording apps generally process audio on the device. Calling and conferencing apps send audio to a service. Check each app's own documentation to learn how it stores or handles recordings and call audio.

Step-by-step instructions

The available options depend on your phone model, Android version and app. Work through these steps in order and stop once the level is usable.

• Open the app you actually use for recording or calls. Look in its audio or recording settings for an input gain, microphone sensitivity or input level control. Dedicated recorder apps are the most likely to offer one. Many camera and calling apps do not.
• If the app lets you choose a microphone or audio source, pick the one that matches how you hold or place the phone. Phones often have several microphones, and an app may use a different one for video than for voice.
• Look for noise reduction or other audio processing options in the app or in the phone's call settings. These features can change the perceived level and reduce background noise, but they can also make quiet speech sound uneven. Change one setting at a time so you can switch it back.
• If the app lets you choose a sample rate or format, keep the default unless another tool needs a specific value. A higher sample rate does not make a recording louder.
• If no gain control exists, change your position instead. Moving closer to the microphone raises the level. Moving farther away or speaking off to the side lowers it.
• If the level stays low, consider an external microphone. Some external microphones and USB audio interfaces have their own hardware gain control, which works independently of Android.

Manufacturers add their own audio features, so setting names and locations vary between brands and Android releases. If a setting described for another phone is missing on yours, assume your phone may simply not have it. Some guides suggest hidden service menus or root-level tools for changing gain. These are device-specific, may not be reversible and are outside the normal settings.

Check the output

Make a short test recording in the same app and conditions you plan to use. Play it back on a different output device, such as headphones, if you can. The phone speaker can hide distortion and background noise.

• Speech is clearly audible without turning playback volume to maximum.
• Loud words do not crackle or sound flattened. If they do, the recording is clipping: the input level is too high or you are too close.
• If the app shows a level meter, peaks stay below the top of the scale during your loudest speech.
• Background noise stays well below your voice. If raising the gain makes the noise rise just as much, the cause is distance or environment, not gain.

For video calls, use the calling app's own microphone test or preview if it has one, or ask another participant how you sound. The call service may apply its own automatic gain control and compression, so a local recording and a call can sound different. A browser-based microphone test shows only what the browser receives with the permission you grant it. It does not reflect the settings of other apps.

Common problems and next steps

There is no microphone gain setting on my phone

This is normal on many Android devices. Use an app that includes manual input level control, change your distance from the microphone, or use an external microphone with hardware gain.

The level changes on its own

Automatic gain control in the app or call service raises quiet sounds and lowers loud ones. If the app lets you turn it off or choose an unprocessed audio source, try that. Otherwise, keep a steady distance from the microphone.

The microphone is quiet only with a headset

Make sure the headset microphone is in use rather than the phone's microphone, and that the headset itself is not muted. During calls, Bluetooth headsets usually switch to a voice-oriented mode that can sound narrower than media playback through the same headset.

No sound is recorded at all

Check the app's microphone permission and, on newer Android versions, the system-wide microphone access toggle. Close other apps that may be using the microphone, then restart the phone. If the built-in microphone records nothing in any app, the problem may be hardware, and your next step is the device manufacturer's support.