Check your track's LUFS before you upload
Measure integrated loudness and true peak against streaming, podcast, and YouTube targets — free, private, right in your browser.
Drop an audio file here or click to add
MP3, WAV, FLAC, M4A
Why check LUFS before you upload
Every major platform normalizes loudness on playback — upload something too loud and it just gets turned down, wasting the headroom you fought for; upload something too quiet and it sounds weak next to everything else in the feed. Checking LUFS before you upload tells you exactly where you stand against the target the platform is going to normalize toward, so you can fix it in advance instead of guessing.
What LUFS actually measures
LUFS (Loudness Units Full Scale) measures perceived loudness the way human hearing actually works, not just peak level — two tracks can have the same peak level and sound very differently loud. Streaming platforms target around -14 LUFS, podcasts around -16 LUFS. This tool measures your track's integrated loudness (ITU-R BS.1770, the same standard broadcasters use) so you know exactly where it lands.
True peak and why it matters after loudness normalization
True peak estimates the actual analog peak after digital-to-analog conversion, which can exceed the sample peak you see in a waveform view. A track with true peak above -1 dBTP can clip on some playback systems even if it looks fine in your player. Checking true peak alongside LUFS catches this before it becomes an audible problem on someone else's speakers.
How to check LUFS and true peak
One step: drop the file. Everything happens locally in your browser — your track is never uploaded to a server.
1. Drop your track
MP3, WAV, FLAC, or M4A. The file is decoded and measured with the Web Audio API — nothing leaves your device.
2. Get LUFS and true peak instantly
The tool measures integrated loudness and true peak, then checks both against streaming, podcast, and YouTube targets.
3. Fix and re-check
If you're off target, adjust with a mastering tool and re-check — or head straight to mastering and a lyric video for the same track.
Where LUFS targets matter
Different platforms normalize to different targets — checking against all three before you upload saves a re-render later.
Streaming (Spotify, Apple Music)
Streaming platforms normalize to around -14 LUFS. Uploading louder just gets turned down and wastes headroom; uploading quieter leaves you sounding weak next to other tracks.
Podcast loudness spec
Most podcast platforms and directories expect around -16 LUFS. Checking before you publish avoids episodes that sound noticeably quieter or louder than the rest of your catalog.
YouTube loudness normalization
YouTube normalizes playback loudness too. A clean, properly measured upload avoids the platform's normalization making your track sound flat or over-compressed.
Frequently asked questions
LUFS and true peak, answered.