What Is LUFS? Streaming Loudness, Explained Simply

Updated 2026-07-05

You spent hours making your master loud, uploaded it to Spotify, and it came out quieter than everyone else’s track. Nothing is broken. That’s loudness normalization doing its job, and LUFS is the unit it speaks.

LUFS in one paragraph

LUFS stands for Loudness Units relative to Full Scale. Unlike a peak meter, which only cares about the single loudest sample, LUFS measures how loud a track feels over time, weighted the way human ears actually hear. A whisper with one loud click has a high peak but a very low LUFS. A wall of distorted synths has a high LUFS even if it never technically clips.

Why streaming services turn tracks down

Every major platform plays all songs at roughly the same perceived loudness, so listeners don’t reach for the volume knob between tracks. If your master is louder than the platform’s reference level, it simply gets turned down. The crushed, brick-walled master that won the loudness war now just sounds flat and small at the same volume as everyone else, with none of its dynamics left.

The reference levels that matter

Spotify, YouTube, and TIDAL sit around -14 LUFS integrated.
Apple Music uses roughly -16 LUFS with Sound Check.
Deezer targets about -15 LUFS.

That does not mean you must master at exactly -14 LUFS. Plenty of great releases land louder and take a small turn-down. The point is to know how much will be taken away, and to make that choice on purpose instead of by accident.

Check your track in 10 seconds

Drop your master into the free loudness checker. It measures the integrated LUFS and the true peak in your browser (the file never gets uploaded), then shows exactly how many dB each platform will turn your track down, per platform. If the penalty is bigger than you expected, ease off the limiter and let the mix breathe.

A sane target to start from

For most modern genres, a master around -9 to -11 LUFS with about 1 dB of true-peak headroom keeps competitive punch and survives normalization gracefully. Quieter genres can sit closer to -14 and keep all their dynamics. There is no single right number; there is only knowing your number.

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