Volume Booster — Make Audio Louder Online
A free online volume booster that makes quiet audio louder. Raise an MP3, WAV or M4A by a set number of decibels and download the louder MP3. Runs in your browser with ffmpeg — your file is never uploaded.
How do I make a quiet audio file louder?
If a recording is too quiet, load it here, choose how much louder you want it in decibels, and press Boost — the tool amplifies the whole track and hands you a louder MP3 to download. Around +6 dB doubles the amplitude and sounds clearly louder; push too far and the loudest peaks clip and distort, so start moderate and only go high for genuinely quiet files. It reads almost any input (MP3, WAV, M4A, FLAC, Opus and more) and runs entirely on your device with ffmpeg compiled to WebAssembly, so nothing is uploaded. Need to cut the clip first? Use the MP3 Trimmer; to change format, the Audio Converter; to flip it backwards, Reverse Audio.
Frequently Asked Questions
How do I make an audio file louder?
Load your audio file, drag the slider to the amount of boost you want in decibels — for example +6 dB roughly doubles the signal amplitude and sounds clearly louder — then press Boost. The tool amplifies the whole track, lets you preview the result, and gives you a louder MP3 to download. Everything runs on your device, so nothing is uploaded.
Will boosting the volume distort my audio?
Boosting the volume can distort your audio if you push the gain too far. If a track is already near full scale, adding a lot of gain pushes the peaks past the maximum and they clip, which sounds harsh and crackly. Start with a moderate boost such as +3 to +6 dB and only go higher for genuinely quiet recordings. If the result sounds distorted, reload the original and use a smaller amount.
What does the decibel amount mean?
Decibels (dB) measure gain on a logarithmic scale. About +6 dB doubles the signal amplitude and sounds clearly louder, +10 dB is roughly twice as loud again to the ear, and negative values make the audio quieter. Because it is logarithmic, small numbers make a big difference, so most files only need a few decibels of boost.
Is my audio uploaded, and what format do I get back?
Nothing is uploaded — the boost runs entirely in your browser with ffmpeg compiled to WebAssembly, and the engine downloads once (about 10 MB) and later runs start instantly. The louder result is saved as an MP3 at the bitrate you choose, which plays everywhere; if you need another format, run the MP3 through the Audio Converter. The bitrate menu runs from 128 kbps to 320 kbps.
How long a recording can I boost?
A recording has no server-side length cap, because the file never leaves your device — the ceiling is the memory available to the browser tab. Voice memos, interviews and lectures are fine on any modern machine; multi-hour recordings are slower on a phone. You need a current Chrome, Edge, Safari or Firefox — the engine uses WebAssembly and DecompressionStream.