Audio / Volume
Volume Booster
Make a quiet recording louder or a loud one quieter, by up to 30 dB, with a look-ahead limiter that stops peaks from distorting, and preview before you download MP3 or WAV.
Volume Booster: The volume change multiplies every sample by the same amount, set in decibels: +6 dB about doubles the signal level and sounds clearly louder. Boosting past 0 dBFS would clip the peaks, so a look-ahead limiter lowers the level smoothly, just before each peak, to hold them at −1 dB. The page shows the peak level and the integrated loudness in LUFS before and after. Runs 100% locally in your browser with zero server file uploads.
- Category
- Video tools
- Runs
- In your browser
- Cost
- Free · no sign-up
- Availability
- Ready to use
Runs entirely in your browser
MP3, WAV, M4A, OGG, or FLAC · nothing uploaded
To make several tracks equally loud, use loudness normalisation instead, which sets each to the same LUFS level.
Your file is processed in your browser and never uploaded. MP3 files are encoded with LAME, free software under the LGPL, loaded as a separate file; its source is at lame.sourceforge.io.
Decibels in practice
+3 dB is a just-noticeable increase, +6 dB is clearly louder, and +10 dB sounds about twice as loud. A quiet phone recording often needs +10 to +20 dB; boosting that much also raises background noise and hiss.
To measure loudness the way streaming services do, use the LUFS meter; to match several tracks, normalise audio.
Peaks and loudness
The peak is the highest single sample, and 0 dBFS is the most a digital file can hold; loudness, in LUFS, measures how loud the whole track sounds. A recording with a few sharp peaks can sound quiet while already peaking near 0 dB, which is when the limiter lets you go louder.
How to use it
- Choose an audio file; its current peak level and loudness are shown.
- Set the change, or pick as loud as possible without limiting.
- Preview it, then download MP3 or WAV.
Privacy & limitations
Your audio is processed in your browser and never uploaded.
Related tools
Frequently asked questions
How much louder is +6 dB?
It doubles the signal's amplitude; to the ear, about +10 dB sounds twice as loud.
What is the limiter doing?
When a boost would push peaks past the maximum level, it turns the volume down for a few milliseconds around each peak instead of cutting it off, which would sound like crackling.
Should I use this or loudness normalisation?
Use this to make one file louder by a set amount; use normalisation to bring several files to the same loudness, such as −14 LUFS for streaming.
Free tool · runs in your browser · no account required