Audio Volume Booster

Guide & FAQ
Drop an audio file here, or click to choose MP3, WAV, M4A, OGG, FLAC or video sound. Free, no signup, no watermark.

Guide: Audio Volume Booster

How to make audio louder

Drop an audio file on the page. The tool shows its current peak and average level. Pick a quick boost such as +6 dB, or drag the gain slider, and press Preview boosted to hear the first 30 seconds. When it sounds right, choose a format and press Boost and save.

Gain, normalise and the limiter

  • Each +6 dB doubles the amplitude; +10 dB sounds roughly twice as loud.
  • Normalise raises the loudest peak to minus 1 dBFS and is the safest way to maximise a quiet file.
  • The limiter keeps peaks under the maximum so a strong boost does not crackle.

Tips

If the boosted file sounds harsh, lower the gain a little: the warning line tells you when peaks are being limited. Recordings with a lot of background noise get louder noise too, so clean them first if you can. Lower your speaker volume before previewing a large boost.

Private and free

Everything runs in your browser. There is no upload, no account, no watermark and no length limit apart from your device memory.

FAQ

How much can I boost the volume?

Up to 30 dB of gain, which is about 30 times the amplitude. With the limiter on, the loudest peaks are rounded off so they never clip, so very large boosts on already loud audio will sound compressed.

What does the limiter do?

A limiter softly squeezes only the peaks that would go past the maximum level. Without it, those peaks are chopped flat, which causes crackling distortion. Keep it on unless you want the raw result.

What is normalise?

Normalise finds the loudest peak in the file and raises the whole file so that peak sits at minus 1 dBFS, just under the maximum. It makes a quiet recording as loud as it can be without any distortion.

What do dBFS values mean?

dBFS measures digital level against the maximum. 0 dBFS is the loudest a file can be; quieter sounds are negative. The tool shows the peak and the average (RMS) level before and after your change.

Will it reduce the quality?

Boosting is exact, but saving to MP3 or M4A is lossy. Use 192 kbps or higher for music, or save as WAV for no extra loss.

Is my audio uploaded?

No. All processing happens in your browser and the tool makes no upload requests.

Open-source licences

  • lamejs (LAME MP3 encoder, JavaScript port): LGPL-3.0