How to reduce microphone background noise on Windows

Start with the microphone

Move the microphone close enough to your mouth for a clear voice, but out of the direct path of breath. Point it away from a fan or keyboard where practical. A headset can help prevent speaker sound from reaching the microphone. Noise removal can reduce unwanted sound, but it cannot guarantee that every sound disappears or repair a disconnected microphone.

In Windows Settings → System → Sound, check that your physical microphone appears under Input and that its test responds when you speak. If it does not, check the cable, Bluetooth connection and any physical mute switch first. A filter needs a working signal to process.

Allow microphone access

On Windows 11, open Settings → Privacy & security → Microphone. Enable microphone access and app access, including desktop app access for installed desktop software. On Windows 10 the path is Settings → Privacy → Microphone. Store apps can have individual permissions; desktop apps use the desktop-app access control. A browser may also ask for permission for the meeting site.

Microsoft ended free Windows 10 security updates on 14 October 2025; check your organisation’s update arrangements or consider Windows 11.

Choose where to remove noise

Zoom offers background noise suppression in its desktop audio settings; Teams has a noise suppression control in its device or meeting audio settings. Discord includes Krisp suppression under Voice & Video. Names and availability can vary with version or organisation settings. Start with the built-in option if it meets your needs.

Route a filtered microphone across apps

KleenMic is our microphone noise-removal app for 64-bit Windows 10 and 11. Windows 11 on Arm runs the x64 app using emulation. The Windows installer is self-signed and may trigger an unknown-publisher or SmartScreen warning; read the Windows installation guide before deciding whether to continue. Download from the official download page.

1. Install KleenMic and complete the driver setup. Choose your physical microphone in KleenMic and turn noise cancellation on.
2. With headphones connected, use Test Mode to listen, then turn Test Mode off before your call.
3. In the calling app, choose KleenMic, or the exact virtual microphone name shown by Windows, as the input. Windows may append an adapter suffix. Keep your normal headphones or speakers as output.
4. Make a short test call. Closing the window hides KleenMic in the tray and keeps processing running; use the tray’s Quit action when finished.

KleenMic has a 72-hour trial. A $20 one-time license covers one active computer, Mac or Windows. It does not provide meeting notes or transcription, and its Windows release does not provide speaker acoustic echo cancellation.

Compare without stacking filters

Record or make a test call using the same microphone position and typical background noise. First listen with the calling app’s filter alone. Then select the virtual microphone and compare with the calling app’s suppression reduced or disabled where its settings allow. Multiple filters can alter speech or cut off quiet syllables; keeping the configuration that sounds best matters more than enabling every option.

Speak normally, pause, and include soft words and consonants. Ask a listener to check both intelligibility and distractions. For music or other non-speech audio, use the calling app’s appropriate music mode rather than assuming a speech filter will preserve it.

Troubleshoot the signal path

Common questions

Does Windows automatically cancel noise in every app?

Features depend on the device and application. Check the calling app’s audio settings or choose a compatible virtual microphone.

Why can callers still hear a colleague?

Noise filters have different capabilities and cannot guarantee removal of nearby speech. Test in your real room and consider a headset or a quieter location.

Should I select KleenMic as my speaker?

No. Select KleenMic for input and keep your normal headphones or speakers as output.