How to Check and Adjust Microphone Levels on iPhone

iPhone has no system-wide slider for microphone level. iOS manages the input level of the built-in microphones automatically. To get cleaner audio, you check the level with a test recording, then change the things you control: microphone access, position, Mic Mode during calls, settings inside the app, or an external microphone with its own gain control.

Before you start

• Know which app you are testing: Voice Memos, Camera, a calling app or a website in Safari. Each one handles audio in its own way.
• Remove any case, film or cover that might block the microphone openings. These are on the bottom edge, near the earpiece and near the rear cameras.
• Disconnect Bluetooth headphones if you want to test the built-in microphone. When a headset is connected, iOS often uses it as the input device.
• Find out where your audio goes. Voice Memos records on the device. If iCloud sync for Voice Memos is turned on, recordings may also sync to iCloud. A browser-based microphone test may process audio locally or send it to a server. Read the site's privacy statement before you assume either.

Step-by-step instructions

• 1. Confirm microphone access. Open Settings, go to Privacy & Security, then Microphone. Make sure the app you are testing is switched on. A website in Safari asks for permission separately, in a prompt shown when the page requests the microphone.
• 2. Make a short test recording. Open Voice Memos, tap Record and speak at your usual volume and distance for about ten seconds. Watch the waveform. Steady, clearly visible peaks mean the microphone is picking you up. A nearly flat line means the input level is too low or the microphone is blocked.
• 3. Adjust your distance and position. Without a gain control, distance is the main way to change the level. Move closer if the waveform is small. Move back or turn the phone slightly away if loud parts sound harsh. Keep your hand off the bottom edge.
• 4. Use Mic Mode during calls. On supported models and iOS versions, open Control Center while a call or video call is active and tap Mic Mode. Standard is the default. Voice Isolation reduces background noise around your voice. Wide Spectrum picks up more of the room. Mic Mode only appears in apps that support it. To undo the change, switch back to Standard.
• 5. Check the app's own audio settings. Some calling, streaming and recording apps include an input level slider, gain control or noise suppression option. Where one exists, it applies only inside that app.
• 6. Use an external microphone for real gain control. A wired USB-C or Lightning microphone, or an audio interface, may have a hardware gain knob. Set it so normal speech gives clear peaks without hitting the top of the meter. Some recording apps also let you choose the input device and sample rate.

Settings layouts vary between iOS versions. On iOS 18 and later, individual app settings are grouped under Apps in Settings. If a menu is not where you expect, use the search field at the top of Settings.

Check the output

Play back your test recording, ideally on headphones so the phone's speaker does not color the sound. Make sure the output device is the one you expect, since audio may play through a connected Bluetooth device instead of the iPhone. Listen for three things. First, check that your voice is loud enough without turning playback up to maximum. Second, listen for crackling or flattened loud parts, which mean the level is too high. Third, notice whether background noise competes with your voice.

Format limits also affect quality. Voice Memos lets you choose between compressed and lossless audio quality in its settings. Bluetooth headset microphones usually record at lower quality than the built-in microphones or a wired microphone. For calls, the other person hears audio after the calling service has processed it, so ask them how you sound rather than relying only on a local recording.

Common problems and next steps

• Microphone too quiet: check for a blocked opening, move closer and test again. Then confirm the app is not using a Bluetooth headset or another input device you did not intend.
• No sound at all: confirm the app's permission under Privacy & Security, close and reopen the app, and restart the iPhone. An orange dot in the status bar shows that an app is using the microphone. That helps you see whether another app may be holding it.
• Too much background noise: try Voice Isolation during calls. For recordings already made, Voice Memos has an Enhance Recording option in its editing controls that reduces background noise and room echo.
• Distorted or clipping audio: increase your distance from the phone. If you use an external microphone, lower its hardware gain.
• Online microphone test shows no level: allow microphone access when Safari prompts you, check Safari's microphone permission in Settings, then reload the page.
• Still no improvement: record a test in Voice Memos with the case removed. If that recording is silent or heavily muffled while permissions are correct, contact Apple Support or an authorized service provider to check the hardware.