Free audio tool
Audio Volume Booster
Make quiet audio louder or turn the volume down.
Choose another file to continue.
Common questions
Does Murmur upload my audio?
No. Your audio stays on your device.
Do I need an account?
No. Choose a file and get started.
How do I make an MP3 louder online?
Choose the MP3, raise the volume slider, preview the result, and download the boosted file. Processing happens in your browser, so the audio is never uploaded.
How much can I amplify the volume?
Quiet clips can be raised substantially, but heavy boosts also lift background noise. Preview before downloading, and use the audio normalizer when you want steadier levels instead of a straight boost.
Is this a sound booster for any audio file?
It works with MP3, WAV, M4A, and other common formats. The boosted file downloads in the same format family you uploaded.