Audio Volume Booster
Choose a file, slide the boost up and check the levels before you download.
Drag a sound file here or choose one
About Audio Volume Booster
Voice memos, interviews and old recordings are often too quiet. This tool raises the volume by an amount you set in decibels and shows how loud the loudest point and the average are before and after, so you can see how much room there is. You can also lower the volume of a file that is too loud.
When a boost would push the sound past the maximum, it has to be limited. A soft limit rounds the tops of the waves gently, which sounds natural, while a hard limit simply cuts them off and can crackle. The normalise button works out the biggest boost that keeps the loudest point just under the maximum, so nothing is limited at all.
How to use Audio Volume Booster
- Choose a sound file.
- Slide the volume change up, or press the normalise button.
- Check the table for any samples at the limit and pick a soft or hard limit.
- Press Play to listen, then Download WAV.
Common uses
- Raising a quiet voice memo
- Lifting an interview recorded too far from the microphone
- Matching the level of two clips
- Turning down a file that peaks too high
Frequently asked questions
What does 6 decibels mean?
It is about double the height of the sound wave, which most people hear as a clear step up in volume. 20 decibels makes the wave ten times larger.
Why does a boosted recording crackle?
The sound has been pushed past the maximum and the tops of the waves are cut off. Lower the boost or use the soft limit.
What does normalise do?
It finds the loudest point and boosts the whole file so that point sits just below the maximum. Nothing is cut off.
Will background hiss get louder too?
Yes. A boost raises everything, including noise. A very quiet recording may need a cleaner source.
Is the original file changed?
No. A new WAV file is saved and your original stays as it was.