Audio volume booster
Choose an audio file, then set a gain in decibels or normalize the loudest peak to a target. The tool shows the current peak, the gain applied and how many samples would clip, and saves the result as WAV.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Choose an audio file.
- Pick Gain (dB) and drag the slider, or Normalize peak and enter the target.
- Read the current peak, the gain and how many samples would clip. Leave Prevent clipping ticked to avoid distortion.
- Press Apply volume, listen and download the WAV.
How it works
Every sample is multiplied by the gain, 10 to the power of dB/20. For normalizing, the gain is the target peak divided by the current peak. With Prevent clipping, the gain never exceeds the value that would put the peak above -0.1 dBFS. Results are written as 16-bit WAV, and values beyond full scale are cut.
Worked example
A recording peaking at 0.25 (-12 dBFS) normalized to -1 dBFS needs a gain of 10^(-1/20) ÷ 0.25, about 3.57, which is +11.1 dB.
Tips
- A quiet recording with one loud click can only be boosted a little by peak normalization; trim the click first.
- Boosting also raises the background noise by the same amount.
Frequently asked questions
What is clipping?
Digital audio cannot go beyond full scale. If a boost pushes a sample past it, the waveform is cut flat and sounds harsh. The tool counts these samples and, with Prevent clipping ticked, reduces the gain so the peak stays at -0.1 dBFS.
What do the decibel numbers mean?
+6 dB roughly doubles the amplitude and -6 dB halves it. Peak level is measured against full scale (dBFS), so 0 dBFS is the loudest possible sample and -6 dBFS is half of that.
What does Normalize peak do?
It finds the loudest sample and sets the gain so that it reaches the target, for example -1 dBFS. All parts are scaled equally, so the balance inside the recording does not change. It does not match perceived loudness.
Which formats can I use?
Any audio your browser can decode, such as MP3, WAV, M4A or OGG. The result is always a 16-bit WAV file.