D = 20 × log10(g) ; g = 10^(D/20) ; g > 0
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How does this tool work?
Increase or reduce the gain of an audio file from 0% to 400% directly in your browser. Processing stays local and creates a new WAV without changing the source file.
The volume percentage is converted into a gain factor: 100% keeps the level unchanged, 50% halves the amplitude, 200% doubles it, and 0% makes the signal silent. Large boosts can cause clipping when the source already has peaks close to full scale. This operation changes instantaneous gain; it is different from LUFS normalization, which targets overall perceived loudness. The initial setting is 100%, with five-percentage-point steps in the editor. The percentage controls amplitude rather than a linear scale of perceived loudness. The same multiplier affects every channel and background noise. At 400%, amplitudes are multiplied by four; perceived volume is not necessarily quadrupled. The engine reserves no automatic headroom and cannot repair already clipped peaks. During 16-bit PCM writing, values outside −1 to +1 are clipped. Lowering the level after clipping cannot reconstruct the lost peak shapes.
How to use this tool
Import the audio
Choose the file whose level you want to change.
Set the percentage
Choose a value from 0% to 400%, with 100% representing unchanged gain.
Process and listen
Generate the WAV and check that any boost has not introduced audible clipping.
Audio volume adjuster — Calculation reference
- D
- Level change in dB
- g
- Amplitude ratio, dimensionless
Use cases
Boost a quiet voice
Raise the level of a recording whose signal is too low for comfortable listening.
Attenuate a track
Lower music or ambience before using it in an edit.
Standardize a workflow
Apply the same gain factor to several files in Workspace before another processing step.
Examples
Halve the amplitude
0.6 × 0.5 = 0.3 and 20 × log10(0.5) ≈ −6.0206. PCM quantization may round the stored value.
Input
50% setting, sample amplitude 0.6Result
Amplitude 0.3; about −6.02 dBGain that clips
The multiplication exceeds the digital range. This changes the peaks; choose a lower gain to preserve them.
Input
200% setting, sample amplitude 0.8Result
Calculated amplitude 1.6, clipped to 1 in PCMTips and best practices
- 100% leaves gain unchanged; 0% produces a silent signal.
- A large gain increase can clip peaks and create distortion.
- To bring several files toward the same perceived level, use LUFS normalization instead.
Sources and references
- W3C, Web Audio API (opens in a new tab)Page in English
- FFmpeg project, FFmpeg Filters Documentation (opens in a new tab)Page in English
Frequently asked questions
What is the difference between volume adjustment and normalization?
Volume applies a manually selected gain factor. Normalization measures loudness and adjusts the file toward a LUFS target.
Why can audio distort above 100%?
If source peaks are already close to digital full scale, amplifying them can exceed the available range and cause clipping.
Is the original file changed?
No. Bethemesh creates a new WAV and leaves the source file untouched.
Does 50% mean a reduction of 50 dB?
No. An amplitude factor of 0.5 represents roughly −6.02 dB. Decibels are logarithmic and are not percentage-slider points.
Does setting volume to zero delete the audio file?
No. It writes silence for the same duration. The WAV still stores its timed samples and occupies space rather than becoming an empty file.
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