Peak Normalizer
Bring any audio file's loudest sample to a chosen peak target. Different from LUFS normalization — this is the textbook peak-only kind.
Drop your audio file here
or click to browse a file
Two-pass: measures the file's peak first, then applies the exact gain needed to hit the target.
Peak target
Peak normalization scales the whole file so its loudest sample lands exactly at the target, without changing dynamics. For perceived-loudness matching, use the volume booster's LUFS mode instead.
About peak normalization
Peak normalization scales the entire file by a single linear factor so its loudest sample lands at exactly the target dB. The shape of the audio — its transients, its dynamics, its quiet/loud relationships — stays untouched. Only the absolute level changes. This is the right tool when a file came in too quiet but is otherwise mixed correctly, or when you need every track in a batch to top out at the same level for predictable downstream processing.
It's not the same as LUFS / loudness normalization. LUFS measures perceived loudness over time and adjusts to match human hearing — useful for matching tracks to streaming-platform targets. Peak normalization just looks at the single highest sample and aligns it to the target. For streaming-platform mastering, use the volume booster's LUFS mode or the Spotify/Apple/YouTube master pages instead.
How to peak-normalize
- 01
Drop your file
MP3, WAV, FLAC, OGG, AAC, M4A — any common audio format.
- 02
Pick a peak target
−0.1 dB is the standard ceiling. −3 dB or −6 dB if you want headroom for further mastering.
- 03
Render
The tool measures the source's peak, then applies the exact gain needed to land on your target. The result card shows the exact dB applied.
Why use this peak normalizer
- Two-pass — measures first, then renders with the exact required gain
- Four common targets (−0.1 / −1 / −3 / −6 dB)
- Same input format on the way out — MP3 in, MP3 out
- Result card shows before-peak, applied gain, after-peak
- Free, private, no install
- Distinct from LUFS / loudness normalization (use the volume booster for that)
Peak normalizer FAQ
What's the difference vs. LUFS normalization?
Peak normalization aligns the highest single sample to a target. LUFS normalization aligns perceived loudness over time. A heavily compressed pop track and a quiet acoustic ballad can have the same peak but very different loudness — LUFS hears that, peak doesn't. For streaming, use LUFS.
Why −0.1 dB instead of 0 dB?
Some lossy decoders (and some DACs) introduce small inter-sample peaks above the original digital max. Leaving 0.1 dB of headroom prevents post-encode clipping.
Can it raise quiet files?
Yes — that's the most common use. If your file's loudest sample is −12 dB and you target −0.1 dB, the tool applies +11.9 dB. Watch for noise becoming audible in formerly-quiet sections.
Is my file kept private?
Yes. We don't analyse or index your file.
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