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Audio Analyzer / LUFS Meter

Drop any audio file and get the numbers that matter: integrated LUFS (ITU-R BS.1770 with gating), true peak via 4× oversampling, sample peak, RMS, and a waveform. Everything is measured in your browser - nothing uploads.

Drop an audio file here, or click to choose

WAV, MP3, AAC/M4A, OGG - decoded locally, never uploaded

Reading the numbers

Integrated LUFS is the one streaming platforms act on: Spotify and YouTube normalize to about −14, Apple Music −16. A louder master is simply turned down - so judge your number against the platform table and strategy in the streaming loudness guide rather than chasing a target. True peak is the delivery spec that actually matters: keep it at or below −1 dBTP so lossy encoders don't push it into clipping.

The gap between short-term max and integrated loudness is a rough dynamics read: 2-3 LU means a consistently dense master, 6+ LU means real light and shade. Neither is wrong - genre decides. For the electrical side of the dB zoo (dBu, dBV, ratios), see the dB converter.

Audio Analyzer FAQ

How do I check the LUFS of a song?

Drop the audio file on this page. It decodes in your browser, applies the ITU-R BS.1770 measurement (K-weighting filter, 400 ms gated blocks), and reports integrated LUFS - the number streaming platforms normalize on - plus short-term max, true peak, sample peak, and RMS. Nothing is uploaded; large files just take a few seconds of local processing.

What LUFS should my track be?

For streaming, the honest answer is: whatever sounds best, because platforms turn everything to about -14 LUFS (Spotify/YouTube) or -16 (Apple Music) anyway. What matters is the true peak staying at or below -1 dBTP and the dynamics surviving. Podcasts commonly target -16 to -19 LUFS, broadcast -23 (EBU R128). Full platform table in our streaming loudness guide.

What is the difference between sample peak and true peak?

Sample peak is the largest recorded sample value. True peak estimates the analog waveform reconstructed between samples, which can exceed the samples themselves - this tool measures it by 4x oversampling per BS.1770. A file whose samples touch 0 dBFS can have true peaks of +1 dB or more, which is what clips after lossy encoding.

Is my audio file uploaded anywhere?

No. The file is decoded and measured entirely in your browser with the Web Audio API - the page works offline once loaded. That is also why it is fast: no upload, no queue, no server.

Why does my result differ slightly from my DAW meter?

Small differences (a few tenths of an LU) are normal: decoders reconstruct lossy formats slightly differently, some meters use BS.1770 revisions with different gating details, and true-peak oversampling filters vary. Differences beyond ~0.5 LU usually mean one meter is measuring a different thing (momentary vs integrated) or a different file region.

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