Change Audio Volume
Turn an audio file up or down by an exact amount and see whether it will clip.
MP3, WAV, M4A, FLAC, OGG, Opus, AIFF, WMA, AMR and the sound of most videos. Files stay on your device.
How it works
- Choose an audio file.
- Set the change in dB or percent, using the slider or by typing.
- Check the new peak level and the clipping warning, and preview.
- Export and download.
What it does
Changing the volume multiplies every sample by the same factor. A change of +6 dB roughly doubles the amplitude, -6 dB halves it, and 0 dB leaves the file as it is. Set the change with the slider or by typing decibels or a percentage: 200% is about +6 dB and 50% about -6 dB.
The tool measures the file when you open it, so it can tell you the peak level after the change and, before you export, how many samples would clip if the change pushes peaks past full scale.
Louder without clipping
A sample cannot go above 0 dBFS. If a boost would push peaks over it, those peaks are flattened and the sound distorts. You have three choices: use a smaller boost, turn on Limit peaks so a true-peak limiter turns only the loudest peaks down, or use the Normalize tool to reach a target level exactly.
Raising the volume also raises the background noise by the same amount. A boost larger than about 24 dB mostly makes hiss louder.
Lossy files and re-encoding
Volume is changed on the decoded audio, so the result has to be encoded again. With "Same as input" the output keeps the format and about the same bitrate. For the cleanest result from an MP3 or M4A, export to WAV or FLAC, or accept one extra generation of lossy encoding.
Questions
How many decibels is twice as loud?
About +10 dB sounds twice as loud to most listeners, but +6 dB doubles the amplitude of the waveform. This tool changes the amplitude, so +6 dB is a doubling of the signal.
Can I make only part of the file quieter?
Yes. Select the part on the waveform and turn on "Process only the selected part". The output then contains only the selection, changed by the amount you set. To change one section inside a longer file, trim, change and merge, or use the fade tool for gradual changes.
Will it damage the quality?
The gain itself is exact. Quality is affected only by clipping, which the tool warns about, and by lossy encoding. Choose WAV or FLAC as the output if you want no further loss.
What does the clipping warning count?
It counts the samples whose level, after your change, would be at or above full scale. The count comes from reading the file, not from a guess.
Is the file uploaded anywhere?
No. Measuring, previewing and exporting all happen in your browser.