Audio Volume Booster
Fix recordings that are too quiet or too loud. Boost or lower the volume by a set amount with automatic protection against distortion, or normalise loudness to the level streaming services and podcasts use.
- Files stay on your device
- No sign-up
- Free to use
Volume
Each +6 dB doubles the signal level; our ears perceive about +10 dB as twice as loud.
Output
Processing happens on your device; your audio is not uploaded.
How to use Audio Volume Booster
- Drop an audio file onto the upload area.
- Choose Boost or lower and set the number of decibels, or Normalise loudness and choose a target.
- Choose the output format.
- Select Change volume, listen to the result and download it.
Audio Volume Booster features
±20 dB adjustment
Raise quiet recordings or tame loud ones in one-decibel steps.
Built-in limiter
Peaks are held just below the maximum, so boosting does not cause harsh clipping.
Loudness normalisation
EBU R128 loudness measurement adjusts files to −14, −16, −19 or −23 LUFS.
Platform targets
Presets match the levels used by Spotify, YouTube, Apple Podcasts and broadcasters.
Keep or change format
Save in the original format or as MP3, M4A or WAV.
Private
Processing happens on your device.
When to use Audio Volume Booster
- Making a quiet phone recording or voice memo audible.
- Matching the loudness of podcast episodes or audiobook chapters.
- Lowering a track that is much louder than the rest of a playlist.
- Preparing music for streaming platforms that normalise loudness.
- Boosting a lecture recording for listening in noisy places.
Audio Volume Booster FAQ
How much louder will +6 dB make it?
+6 dB doubles the signal amplitude. People perceive roughly +10 dB as twice as loud, so +6 dB is a clear but moderate increase.
Why does a big boost sound squashed?
If the original already has loud peaks, the limiter has to hold them down a lot, which reduces dynamics. Normalisation, or a smaller boost, often sounds more natural.
What is LUFS?
Loudness Units relative to Full Scale measure how loud audio sounds to people, not just its peak level. Streaming services adjust tracks to a LUFS target, so mastering near that target avoids being turned down.
Which target should I use?
−14 LUFS for music on Spotify and YouTube, −16 LUFS for podcasts, and −23 LUFS for broadcast. −19 LUFS suits quieter, more dynamic material.
Can it remove background noise too?
Boosting also raises noise. Use the Audio Noise Reducer first, then adjust the volume.
Volume, peaks and perceived loudness
Digital audio has a hard ceiling: 0 dB full scale. Increasing volume multiplies every sample, and samples pushed beyond the ceiling are flattened, a harsh distortion called clipping. A limiter prevents this by briefly turning down only the loudest moments, so the overall level can rise while peaks stay just below the maximum.
Peak level, however, is a poor guide to how loud something sounds. A recording with one sharp clap may peak at full scale yet sound quiet overall. Loudness measurement, standardised as EBU R128 and ITU BS.1770, weights the audio by how sensitive the ear is to different frequencies and averages it over time, giving a value in LUFS that matches perception.
Streaming platforms use these measurements to make everything play at a consistent level. A track louder than the platform target is simply turned down, so pushing music ever louder gains nothing and costs dynamics. Normalising to the target in advance gives predictable results.
Speech benefits most from loudness normalisation. Interviews recorded on different devices vary widely, and evening them out makes podcasts and lectures far more comfortable to listen to.