How to use the MP3 Volume Booster
- Choose an audio or video file.
- Choose how much louder. +6 dB is roughly twice as loud.
- Keep "Prevent distortion" ticked.
- Click Change volume and download.
How the booster works
Volume is raised by the number of decibels you choose. A limiter then catches peaks that would go over the maximum level, which would otherwise cause crackling. For files that are uneven rather than just quiet, the Audio Normalizer usually gives a better result.
Videos too
Drop a video and only its sound is changed; the picture is copied as it is, so the conversion is quick.
Good to know
Gain is applied in decibels, followed by a limiter at 95% of full scale that stops peaks from clipping. For video files only the audio is processed; the picture is copied unchanged.
Supported files
Any common audio or video file: MP4, MOV, MKV, WEBM, AVI and other video formats, and MP3, WAV, M4A, FLAC, OGG, OPUS, WMA and other audio formats. Files up to 1 GB each.
Frequently asked questions
How loud is +10 dB?
About twice as loud as +6 dB to your ears, and roughly three times as loud as the original.
Can I make it quieter?
Yes, choose −6 dB.
Is the MP3 Volume Booster free?
Yes, completely free, with no sign-up and no watermark. Files up to 1 GB each can be converted, and there is no daily limit.
Are my files safe?
Yes. Files are converted locally in your browser and are never uploaded. When you close the page, nothing is left behind.
Does it work on iPhone and Android?
Yes, in Safari, Chrome and other modern mobile browsers. Short files work best on phones; for long or high-resolution videos a computer is faster.