Louder by exact decibels
Add anything from 0.5 to 20 dB. +3 dB is the safe default; +6 dB is about twice as loud.
Increase MP3 Volume
Make MP3 songs and recordings louder, right in your browser. Choose how many decibels to add or remove, or let the tool find the maximum volume that does not distort. Up to 10 files at a time, and nothing is ever uploaded.
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Drop MP3 files here or click to choose
MP3, WAV, M4A, AAC, OGG, FLAC… · up to 10 files · max 200 MB each · the result is always MP3
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Everything happens in your browser: your audio files are never uploaded.
Main features
A volume booster for MP3 files that runs entirely on your device.
Automatic maximum
The tool measures the loudest peak of the song and raises the whole file to the maximum level that still does not clip.
Quieter too
Move the slider below zero to lower the volume of a file that plays too loud, down to −20 dB.
One channel only
Change only the left or only the right channel of a stereo file, for example to balance a recording.
Nothing is uploaded
FFmpeg runs inside your browser, so your files never leave your computer or phone.
Up to 10 files at once
Apply the same change to a whole batch and download the results one by one or as a .zip.
MP3 in, MP3 out
WAV, FLAC, M4A, AAC, OGG and other audio files are accepted too and come out as MP3, at the bitrate you choose.
Free, no account, no watermark
Process as many files as you like. We only ask you to share the website if you find it useful.
Questions and answers
Is it really free?
Yes. There is no account, no limit on the number of files and no watermark or audio tag. The website is supported by ads.
Are my MP3 files uploaded to a server?
No. Everything is processed by your browser with FFmpeg compiled to WebAssembly. You can even disconnect from the internet once the page has loaded.
How many decibels should I add?
Start with +3 dB, which is clearly audible but safe for most files. +6 dB sounds about twice as loud, +10 dB about three times. If you do not know how much headroom the file has, choose "Automatic": it raises the volume exactly to the point where the loudest peak reaches the maximum.
Does the MP3 lose quality?
The audio has to be decoded, changed and encoded again, so a new MP3 is produced. By default it uses the same bitrate as the original, which keeps the loss negligible for normal listening. If you need the best result, pick 320 kbps.
The result sounds distorted. What happened?
Digital audio has a hard ceiling: if the file was already loud, adding several decibels pushes the peaks over it and they get flattened (clipping). Use fewer decibels, or the "Automatic" mode, which never goes past the ceiling.
Which formats are supported?
MP3, WAV, M4A, AAC, OGG, OPUS, FLAC, WMA, AIFF and more. Whatever you put in, the result is an MP3 file.