Free LUFS checker

Upload a track above and you get three numbers in about thirty seconds: integrated loudness (LUFS), true peak (dBFS), and dynamic range (LU) — plus a full read on your tonal balance and specific recommendations if something's off. No plugin to install, no account, and the file is deleted after analysis.

What is LUFS?

LUFS (Loudness Units relative to Full Scale) measures how loud your track actually sounds, averaged over its whole length and weighted to match human hearing. That's different from peak level: two tracks can hit the same peak and one can sound twice as loud, because loudness lives in density — how much of the time the track sits near its ceiling — not in the highest sample.

What LUFS should my master be?

Not -14. That's the number everyone quotes, and it's a playback level, not a mastering target. Spotify normalizes everything to around -14 LUFS at playback — but normalization adjusts volume, not character. A dense -9 master turned down to -14 still sounds dense; a timid -14 master has nowhere to hide. Most commercial releases master between -11 and -8 LUFS depending on genre, and let the platforms handle the level.

So the real question isn't "am I at -14?" — it's "does my track have the density its genre needs, without the limiter eating the punch?" That's what the dynamic range number tells you, next to the LUFS.

Why not just use a meter plugin?

If you have one and know how to read it, use it — Youlean's is good. This checker is for when you want the numbers without a DAW session, or you want them interpreted: the analysis tells you whether the LUFS, peak, and dynamics make sense together for a finished master, and what to change if they don't. You can then master the track right here and A/B it against your original at matched loudness.

Related: How loud is my song? · Is my master clipping? · Free mix analysis & AI mastering