Loudness meter and normalizer
Drop a track. Get LUFS, true peak and loudness range, then normalize to a platform target.
Nothing is uploaded. Everything runs in this tab with @audio/loudness and @audio/dynamics.
An EBU R128 loudness meter that runs on your device
Online LUFS meters upload your master. This one measures in the browser with @audio/loudness, an open-source ITU-R BS.1770-4 implementation verified against the EBU test set: integrated loudness with gating, loudness range and 4× oversampled true peak. Drop a WAV, FLAC, MP3 or even a video and read the numbers in seconds.
Normalize for Spotify, YouTube, Apple Music and podcasts
Choose a target and the page applies the exact gain, then a true-peak limiter at the ceiling you set, re-measures, and lets you save the result as WAV, FLAC, MP3, OGG, Opus or AAC. The report shows what each platform will do to your file on playback, so you can stop chasing loudness that gets undone anyway.
Targets in one place
- Spotify, YouTube, Tidal, Deezer: -14 LUFS, -1 dBTP
- Apple Music, Apple Podcasts, most podcast hosts: -16 LUFS, -1 dBTP
- Amazon Music, SoundCloud: about -18 LUFS
- EBU R128 broadcast: -23 LUFS, -1 dBTP; ATSC A/85 (US): -24 LKFS, -2 dBTP
What the numbers mean
Integrated LUFS is the loudness of the whole program. Loudness range (LRA) in LU describes how much the loudness varies; speech sits around 3 to 8 LU, dynamic music above 10. True peak catches inter-sample overs that a sample-peak meter misses.
Questions
What is LUFS? Loudness Units relative to Full Scale, the perceptual loudness measure defined by ITU-R BS.1770. Integrated LUFS describes the whole file with gating, so silence does not pull it down. Streaming services normalize to a LUFS target.
What loudness should I master to? Spotify, YouTube and Tidal play back at -14 LUFS, Apple Music and most podcast platforms at -16, EBU broadcast at -23 with a -1 dBTP ceiling. A louder master is simply turned down on playback.
What is true peak? The peak level after 4× oversampling, which reveals inter-sample peaks that clip in DACs and lossy codecs. Keep it at or below -1 dBTP for streaming.
Is the measurement standard-compliant? Yes. @audio/loudness implements ITU-R BS.1770-4 K-weighting with absolute and relative gating, EBU R128 loudness range (EBU Tech 3342) and 4× oversampled true peak, and is verified against the EBU test vectors.