Audio Volume Changer
Upload an audio file and boost or reduce its volume. Runs entirely in your browser and downloads as a WAV file.
Click to upload or drag and drop
MP3, WAV, OGG, or other common audio formats
How it works
Every audio sample is multiplied by your chosen percentage (100% leaves it unchanged, 50% halves the volume, 200% doubles it) and capped at the loudest and quietest values the format allows, to prevent digital distortion from a value trying to go louder than "maximum."
Why higher isn't always better
Pushing volume too high causes clipping — the peaks get flattened rather than continuing to grow — which sounds harsh or distorted rather than genuinely louder. If you see the clipping warning, try a lower percentage.
The arithmetic
The slider runs from 10% to 300% in steps of 1%. Every sample is multiplied by the percentage divided by 100 and then limited to the range −1 to +1. At 50% a sample of 0.8 becomes 0.4. At 200% a sample of 0.4 becomes 0.8 with no loss, but a sample of 0.8 would become 1.6 and is capped at 1.0, which triggers the clipping warning. At 300%, anything above about 0.33 clips, because 0.34 × 3 is 1.02.
Decibels and file output
Doubling the sample values (200%) adds about 6 dB, and halving them (50%) removes about 6 dB. The result is always a 16-bit WAV with the original length and channel count, named after your file, so interview.mp3 downloads as interview.wav. One minute of stereo audio at 44,100 Hz is about 10 MB as a WAV (10,584,044 bytes), which is much larger than the compressed source.
Limits
One multiplier is applied to the whole file. There is no fade, limiter, normalizing or selection of a section. Nothing changes until you press Apply Volume Change, and the clipping notice only appears after you have applied a setting. Reducing below 100% can never clip, and files up to 50 MB are accepted.
Frequently asked questions
What does the clipping warning mean?
It means the volume increase pushed some parts of the audio louder than the format can represent, and those peaks were capped rather than allowed to distort. Try a lower percentage for a cleaner result.
Can this fix audio that's already too quiet to hear well?
It can raise the overall level, but it can't recover detail that was never recorded — very quiet or noisy source audio will still sound that way, just louder.
How many decibels is 200%?
Doubling every sample value adds about 6 dB, and 50% subtracts about 6 dB. The relationship is logarithmic, so 300% is about +9.5 dB rather than three times the decibels.
Why do I have to press Apply after moving the slider?
The slider only sets the multiplier. The whole file is processed and encoded when you press Apply Volume Change, which also tells you whether any peaks were capped.
Can lowering the volume cause clipping?
No. Values below 100% only shrink the samples, so nothing can exceed the limit. Clipping can only happen when you raise the volume.