LUFS Checker Online

What is a LUFS checker?

A LUFS checker measures the integrated loudness of your audio file in LUFS (Loudness Units Full Scale), the standard unit used by all major streaming platforms for loudness normalization. Unlike peak meters that only measure the loudest instantaneous sample, LUFS measures perceived loudness across the entire track — closer to how human ears actually hear. Our free LUFS checker online reads your file and reports integrated LUFS, true peak (dBTP), and loudness range (LRA) so you know exactly how your track will be treated by each platform.

Streaming platform loudness targets

Each streaming platform normalizes your track to its own target loudness. If your track is louder than the target, the platform turns it down. If quieter, it may be turned up (with potential gain staging artifacts). Here are the current targets:

Why loudness for Spotify matters

Spotify normalizes all tracks to −14 LUFS. If your master is louder (e.g., −8 LUFS, common in loudness-war mastering), Spotify will turn it down by 6 dB — and because it applies ReplayGain attenuation, your track loses punch and dynamics relative to a properly mastered track at −14 LUFS. Tracks at −14 LUFS with good dynamics sound louder and more open on Spotify because they're not being attenuated. A Spotify loudness check before release ensures your master hits the target and sounds its best.

How to check your LUFS for free

Upload your audio file above — WAV, MP3, FLAC, M4A, or AIFF. Our tool analyzes integrated LUFS, true peak, and loudness range (LRA) in seconds, then shows you whether your track meets each platform's target. No signup, no download, no plugin installation. If your LUFS is too high (too loud), reduce your limiter ceiling or use less compression. If too low, increase makeup gain or limiting. Aim for −14 LUFS with a true peak no higher than −1 dBTP for universal platform compatibility.

LUFS vs dBFS — what's the difference?

dBFS (decibels Full Scale) measures peak amplitude — the loudest single sample in your file. LUFS measures perceived loudness over time, accounting for frequency sensitivity and duration. Two tracks can have the same peak (−0.1 dBFS) but very different LUFS values depending on how compressed and dense the mix is. Streaming platforms use LUFS for normalization because it better represents how loud the track sounds to listeners, not just its technical ceiling.