Free Tool
LUFS Loudness Analyzer
Drop an audio file to measure loudness. Integrated LUFS, true peak, LRA, and a loudness timeline — 100% in your browser.
Drop an audio file here or click to browse
MP3, WAV, FLAC, AIFF, OGG, M4A
Decoding…
Loudness Timeline
Platform Targets
What is LUFS?
Loudness Units Full Scale
LUFS is the standard for measuring perceived loudness. Unlike peak meters, it weights frequencies the way the human ear does. Streaming platforms normalize all tracks to a target LUFS — making your master louder just means the platform turns it down.
Privacy
Your audio file is decoded and processed entirely in your browser. Nothing is uploaded to any server. Closing the tab releases all memory.
The Three Readings
Integrated
Average loudness across the whole track, doubly-gated per ITU-R BS.1770. This is the number streaming platforms use for normalization.
Short-term
Maximum loudness in a 3-second window. Shows the loudest section of your track — useful for catching hot spots that might cause limiting artifacts.
Momentary
Maximum loudness in a 400ms window. Catches transient peaks and sudden jumps that short-term measurement may average out.
True Peak vs Sample Peak
dBTP accounts for what happens between samples during D/A conversion. Target –1 dBTP to avoid clipping after lossy encoding on streaming platforms.
Frequently Asked Questions
What LUFS target should I aim for?
Spotify and Apple Music normalize to around –14 LUFS integrated. YouTube normalizes to –14 as well. Masters above –14 LUFS will be turned down; masters well below it may sound quiet relative to other tracks on the platform.
What is true peak?
True peak measures the peak level of a signal after digital-to-analog conversion. Most streaming platforms recommend a –1 dBTP ceiling to prevent clipping on consumer devices and after lossy encoding (MP3, AAC).
What is LRA?
Loudness Range measures the dynamic spread of your track in LU. A high LRA (10+ LU) means lots of dynamics; a low LRA (3–5 LU) means heavily compressed. There's no "correct" value — it depends on genre and intent.
Is my file uploaded anywhere?
No. All analysis runs locally in your browser using the Web Audio API. Your audio never leaves your device.
Need loudness normalization in your playlists?
Track Lyst has built-in LUFS normalization — set a target and every track plays at the right level.
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