Change Audio Volume
Raise or lower the volume of an audio file by a percentage — 200% for twice the amplitude, 50% for half — and get a new MP3 or WAV back at the level you asked for. This changes the actual amplitude stored in the file, so the result plays at the new level everywhere rather than depending on a player’s volume slider. It is free, needs no account, and adds no watermark to your result.
Change Audio Volume
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What people use it for.
What happens to your file.
FFmpeg applies a gain adjustment to the audio samples and writes a new file, keeping the sample rate, the tags and the cover art. When you make a file louder, a limiter holds the loudest peaks just under full scale, so they are not cut flat into distortion; everything quieter than that lands at exactly the new level. Decibels are logarithmic, which is why +6 dB is roughly twice as loud and −6 dB roughly half.
Where it stops: Raising volume raises the noise floor with it, so hiss and hum get louder alongside the voice. A very large increase on an already loud track leaves the limiter holding down much of the music, which sounds squashed, so increase in moderate steps. If your goal is consistent loudness across several files, use Normalize Audio instead, which measures perceived loudness rather than applying a fixed gain.
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Common questions.
Should I use this or Normalize Audio?
Use this when you know exactly how much louder or quieter you want a file. Use Normalize Audio when you want several files to end up sounding equally loud, because it measures perceived loudness and works out the gain for you.
How much louder is 200%?
Doubling the amplitude is about +6 dB, and 50% is about −6 dB. Decibels are logarithmic, so modest settings matter: 140% (about +3 dB) is clearly noticeable, and 400% (about +12 dB) is a very large jump.
Will making it louder cause distortion?
Not the harsh kind. Peaks that would go past what the format can store are held just under full scale by a limiter instead of being cut flat, which is what clipping is. A very large increase on music that is already loud can still sound squashed; use a smaller step or Normalize Audio.
How do I lower the volume of an MP3?
Set the volume below 100%, for example 70% for about −3 dB or 50% for about −6 dB, and download the new MP3. The tags and album art are kept.
You might also need.
Normalize perceived loudness using FFmpeg loudnorm processing for more consistent playback volume.
Reduce audio size by re-encoding to MP3 or AAC at a selected bitrate while preserving normal playback compatibility.
Convert audio files between MP3, WAV, M4A, FLAC and OGG using FFmpeg with bitrate and quality controls.
Cut audio to a selected start time and duration using FFmpeg and export the result in a common audio format.