Online LUFS meterfor your mix
Free online loudness analyzer. Measure LUFS, True Peak, LRA and stereo phase to the EBU R128 / ITU-R BS.1770 standard — right in your browser, nothing uploaded.
Drop an audio file
WAV · MP3 · AIFF · FLAC · M4A — stays in your browser
LUFS, True Peak & LRA explained
Integrated LUFS
Average loudness across the whole track — the number streaming platforms normalise to.
Short-term & Momentary LUFS
Loudness over 3-second and 400-millisecond windows, for catching loud sections.
True Peak (dBTP)
Inter-sample peak level. Keep it under −1 dBTP to avoid clipping after lossy encoding.
LRA (Loudness Range)
The dynamic spread between quiet and loud passages, measured in LU.
PSR (Peak-to-Short-term Ratio)
How much transient punch is left after limiting — a quick read on how squashed a master is.
Correlation (stereo phase)
+1 is mono-compatible, 0 is wide, negative risks phase cancellation in mono playback.
Nothing leaves your device.
Your file is decoded and measured locally with the Web Audio API. Nothing is uploaded — ever.
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