Normalize Audio Loudness Online — Load an audio file (MP3, WAV, FLAC, OGG, M4A and more) and pick a target loudness level. A professional two-pass loudness measurement is used so the result matches the chosen LUFS target with a fixed -1.5 dBTP true peak limit. Pick -23 LUFS for broadcast standard, -16 LUFS for music, or -14 LUFS for a louder podcast style. Everything runs locally in your browser.
Supported input: MP3, WAV, FLAC, OGG, Opus, M4A, AAC, WMA, AIFF and other common audio formats. Files are never uploaded to a server.
First use loads an ~30MB audio processing engine into the current browser. It is cached and reused afterwards, so please be patient.
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Click to select or drag and drop an audio file
Any common audio format; under 500MB recommended
-1.5 dBTP (fixed)
How it works: the file is measured first, then a linear gain is applied so its integrated loudness (LUFS) matches your target. Quieter files are boosted, louder files are reduced. The true peak never exceeds -1.5 dBTP, so the result stays free of clipping.
Units & meaning: LUFS is the perceived loudness unit used by broadcasters and streaming platforms. Common targets: -14 LUFS (Spotify-style loud), -16 LUFS (balanced music), -18 LUFS (podcast speech), -23 LUFS (EBU R128 broadcast standard). Higher numbers are quieter than lower numbers.
Loudness normalization vs old-style peak normalization: a peak normalizer scales the file until its single highest sample hits full scale (0 dBFS) — one loud drum hit pins the peak and the rest of the track stays just as quiet as before. This page uses LUFS loudness normalization instead: it measures perceived loudness across the whole file, then applies one clean gain so the overall level matches the target. That is also why a normalized file can come out quieter than the source — loudness is matched to the target, not maximized.
