FREE · IN YOUR BROWSER · NOTHING UPLOADED

Online LUFS meter.
Free, and your audio stays put.

Drop a mix or a master and measure its integrated loudness (LUFS), true peak and loudness range (LRA) per ITU-R BS.1770‑5. Your file never leaves your computer.

Drop your audio file here
WAV, AIFF, FLAC, MP3 or M4A · mono or stereo

Measured in your browser. Your audio is not uploaded to any server.

What it measures

Integrated LUFS
The average loudness of the whole file, weighted the way the ear hears (K-weighting), with near-silent parts gated out. It is the figure streaming platforms normalise to.
True peak (dBTP)
The real peak of the signal between samples, measured with oversampling. Converters and codecs can exceed the sample peak, which is why −1 dBTP is the usual ceiling.
LRA
Loudness range: how much the loudness varies across the track, in LU. A heavily compressed master has a low LRA; a film score, a high one.

Questions

How many LUFS should a master have for Spotify?
Spotify normalises playback to −14 LUFS integrated and recommends keeping true peak under −1 dBTP. A louder master is played back quieter; it is not forbidden, but it loses the loudness advantage.
Is my audio uploaded anywhere?
No. The file is decoded and measured inside your browser; it never leaves your computer.
Which standard does the meter use?
ITU-R BS.1770‑5 for integrated loudness and true peak, and EBU R128 for LRA. Audio is decoded at 48 kHz before measuring.
Why does my DAW show a slightly different number?
A tenth or two is normal between meters (decoding rate, true-peak oversampling). Bigger gaps usually come from measuring only part of the track.

To compare versions, level-matched

StudiOS Compare puts up to five masters on one clock, matched in LUFS, with a Delta mode that lets you hear only what changed.

Meet CompareWhat StudiOS is