How to volume normalize an mp3 — free, no upload
- Step 1Upload your audio file(s) — Drop your MP3.
- Step 2Set peak normalisation target (e.g. −1 dBFS) — Set peak target.
- Step 3Download the normalised file(s) — Download the peak-normalized MP3.
Frequently asked questions
What is the difference between peak normalisation and RMS normalisation?+
Peak normalisation sets the loudest sample in the file to a target dBFS value. RMS normalisation sets the average power (Root Mean Square) to a target. For speech and podcast audio, LUFS/EBU R128 normalisation is more accurate than RMS. Peak normalisation is best for maximising headroom without clipping.
Will normalising multiple tracks to −1 dBFS make them all the same volume?+
Not necessarily — peak level and perceived loudness are different. A track with mostly quiet content that peaks at −1 dBFS will sound quieter than a dense, compressed track at the same peak level. For consistent perceived volume across multiple files, use loudness normalisation (LUFS) instead.
What target dBFS should I use for normalisation?+
−1 dBFS is the standard safety ceiling to prevent clipping in playback and encoding stages. −0.1 dBFS is common in mastering to provide maximum level while staying away from the absolute digital ceiling. Avoid 0 dBFS as inter-sample peaks during playback can cause true-peak clipping above digital full scale.
Privacy first
All audio processing runs locally in your browser using FFmpeg compiled to WebAssembly. No file is ever uploaded — only metadata counters are saved for signed-in dashboard stats.