Increase or decrease volume by a precise dB amount. Useful for making a quiet MP3 louder or bringing a too-loud clip down.
The Volume Changer makes audio louder or quieter by an exact amount. Because the control is in decibels you get predictable results: +6 dB doubles the amplitude, −6 dB halves it, and the percentage next to the value tells you what that means in plain terms.
You hear every adjustment live as the file plays, and boosts are protected by a look-ahead true-peak limiter set to −1 dB, so raising the volume of a quiet recording never turns into hard clipping. If you want a file to reach a specific loudness rather than a fixed gain, use the Audio Normalizer.
Gain is a straight multiplication of every sample by 10dB/20. In the live preview this is a Web Audio GainNode; when you press Apply the identical gain is rendered offline, so what you heard is what you export. If clipping prevention is on, the output passes through a limiter that looks 5 ms ahead, reduces gain smoothly before any peak above −1 dBTP (detected on a 4× oversampled signal so inter-sample peaks are caught) and releases over 150 ms.
Lift a voice memo or lecture so it is audible on speakers.
Bring two clips to a similar loudness before merging.
Turn a hot file down so later processing has headroom.
Make a notification sound clearly louder.
| Range | −40 dB to +40 dB, 0.5 dB steps |
|---|---|
| Live preview | Yes — Web Audio gain node |
| Clipping protection | Look-ahead true-peak limiter, −1 dBTP |
| Precision | 32-bit float processing |
About 1.41× the amplitude and double the power. Our ears hear roughly +10 dB as “twice as loud”.
Digital audio cannot exceed 0 dBFS; a limiter squeezes peaks to fit, which is why very loud masters sound dense.
Gain itself is lossless. Only the final MP3 encoding is lossy.
Large boosts can push samples past 0dB; the tool automatically clips safely at full scale, but very large increases may still sound harsh — try Normalize instead for a cleaner loudness boost.
+3dB to +6dB is usually enough to make a quiet recording noticeably louder without distortion.
This tool runs entirely in your browser using the Web Audio API. Nothing is uploaded, stored or shared — there is no server to send your file to, so it works offline once the page has loaded.
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