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Free Online LUFS Meter

Measure integrated, short-term and momentary loudness plus true peak - instantly, in your browser.

  • Free - no account
  • Nothing is uploaded
  • Runs in your browser

Drop a track to measure its loudness

WAV, MP3, FLAC, AIFF, OGG, AAC or M4A - up to 150 MB

Choose a file

Your file is processed on your own device - it is never uploaded.

What the LUFS Meter does

LUFS - Loudness Units relative to Full Scale - is the standard unit for perceived loudness, and it is what every streaming platform, broadcaster and mastering engineer measures against. A peak meter tells you whether you clipped; a LUFS meter tells you how loud your track actually sounds.

This meter decodes your file offline and analyses it to the ITU-R BS.1770 specification used by EBU R 128, producing the full set of readings: integrated loudness across the whole programme, short-term loudness over a 3-second window, momentary loudness over 400 ms, and true peak measured with oversampling so inter-sample peaks are caught.

Because the analysis is offline rather than realtime, the graph is populated the moment loading finishes - you do not have to play the track through to get an integrated figure. Playback is available on top, with the loudness curve scrubbing alongside it.

  • Integrated (programme) loudness in LUFS
  • Short-term (3 s) and momentary (400 ms) loudness
  • Loudness range and true peak in dBTP
  • Full loudness curve over the length of the track
  • Synchronised playback with a moving position indicator
  • Offline analysis - no upload, no waiting

How to use the LUFS Meter

  1. 1

    Drop your audio

    Any WAV, MP3, FLAC, AIFF, OGG, AAC or M4A file up to 150 MB.

  2. 2

    Read the meters

    Integrated, short-term, momentary, loudness range and true peak appear as soon as analysis completes.

  3. 3

    Scrub the curve

    Play the track back and watch the loudness curve to find the sections that push your integrated reading up or down.

Who the LUFS Meter is for

For artists

Check that your master lands in the right loudness window before you send it to a distributor or a label.

For producers

A quick, accurate second opinion on your DAW's meter - useful when you're mixing on a laptop without a metering plugin.

For labels

Measure delivered files against your own approved audio specifications before distribution.

Measurements and standards

Integrated loudness
LUFS, gated, whole programme
Short-term loudness
LUFS, 3-second window
Momentary loudness
LUFS, 400 ms window
Loudness range
LU
True peak
dBTP, oversampled
Standard
ITU-R BS.1770 / EBU R 128
Maximum file size
150 MB
Where it runs
Entirely in your browser

LUFS Meter - frequently asked questions

What does LUFS mean?

Loudness Units relative to Full Scale - a measure of perceived loudness that weights frequencies the way human hearing does, unlike a peak or RMS meter.

What is a good LUFS level for streaming?

Most streaming services normalise to about -14 LUFS integrated. Masters between -14 and -9 LUFS are typical for modern releases; club and dance masters often sit louder by choice.

What is the difference between integrated, short-term and momentary LUFS?

Integrated is the gated average over the whole track and is what platforms normalise against. Short-term is a rolling 3-second window; momentary is a 400 ms window that shows instantaneous loudness.

What is true peak and why does it matter?

True peak measures the actual analogue waveform level between samples. A file that never hits 0 dBFS on a sample peak meter can still overshoot after lossy encoding or D/A conversion, which causes distortion. Aim for -1 dBTP.

Is this LUFS meter accurate?

It implements the ITU-R BS.1770 K-weighting and gating used by EBU R 128, the same specification that broadcast and streaming meters follow, so readings line up with professional tools.

Do I need to play the whole track to get a reading?

No. Analysis runs offline over the entire file, so the integrated value is ready as soon as loading finishes.

What is loudness range (LRA)?

It describes how much the loudness varies over the track, in loudness units. A heavily limited master has a low LRA; a dynamic acoustic recording has a high one.

Is my audio uploaded anywhere?

No. The file is decoded and measured by your own browser and never leaves your device.

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