How to remove microphone hiss and hum from a recording

Short answer: steady microphone hiss and electrical hum can often be reduced when speech remains audible. Test the no-cost 30-second preview on the section with the most noise before deciding whether to process the full recording.

Hiss, hum and what the tool can handle

Microphone hiss is a broadband “shhh” sound. Electrical hum is a lower buzzing tone, often related to a cable, interface, charger or nearby power supply. A steady layer under one speaker is the main target here.

The tool is not a music separator, de-reverb system or clipping repair tool. It may not recover a voice that is fully buried, and several people speaking at once can be mistaken for speech that should be preserved.

A safer way to test the recording

1. Keep the original file. Do not overwrite the only copy.
2. Choose an MP3, WAV, M4A or AAC recording up to 100 MB and 30 minutes.
3. Move the preview window to the noisiest 30-second section if the hiss or hum is not at the beginning.
4. Use the A/B player to check whether the voice stays natural, not just quieter.
5. Process the full recording only if the preview is useful.

The first preview is free within the daily limit. Full-file processing uses a one-minute minimum and a one-time minute pack; there is no subscription or auto-renewal.

Prevent microphone noise in future recordings

• Use a balanced cable and keep power adapters away from audio cables.
• Move the microphone closer and lower the input gain if the room is quiet.
• Monitor with headphones before recording the full interview or lesson.
• Record a few seconds of room tone so you can identify whether the noise is steady.

Start with the audio noise remover, or read the supported formats. Uploaded audio is deleted within the periods described in the privacy policy.