Fix audio that is too quiet or too loud. Boost or lower the volume by up to 20 decibels, or normalise the loudness so quiet and loud parts sound even. The result can be saved as MP3, WAV, M4A and more. It is processed in your browser.
Files never leave your device
Free, no sign-up
No watermark
How to use the Volume Booster: Choose an audio file. Set the change in decibels, or switch on Normalise. Press Change volume and download the result. It is free, needs no sign-up and runs in your browser, so your files are never uploaded.
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How it works
How to use the Volume Booster
1
Choose an audio file.
2
Set the change in decibels, or switch on Normalise.
3
Press Change volume and download the result.
Tips
Tips for the best result
Add 6 dB to roughly double the apparent loudness.
Very large boosts can cause distortion, so listen to the result.
Normalise suits voice recordings with uneven levels.
Questions
Frequently asked questions
What is a decibel?
A unit of loudness. About 6 dB is a clear step up, and 10 dB sounds roughly twice as loud.
Can it distort the sound?
Yes, if you boost too much. Normalise is gentler for uneven recordings.
Are my files uploaded to a server?
No. The work happens inside your browser on your own device. Your files are never sent to us or to anyone else, and they are gone when you close the page.
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