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Measure Loudness the Way Streaming Platforms Do

Drop a file to get integrated loudness in LUFS, true peak in dBTP, short-term and momentary max, and loudness range, measured per ITU-R BS.1770-4 and EBU R128. See how far you sit from Spotify, YouTube, Apple Music and broadcast targets, and by how many dB.

Loudness, true peak and range are all measured on your device. The file is never uploaded, and nothing is stored after you close the tab.

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What each number on the meter means

LUFS measures integrated loudness: the signal is K-weighted, a filter that approximates how the ear weighs different frequencies, then averaged over the whole track with quiet passages gated out so a long silent intro doesn't drag the number down. True peak is a different measurement entirely, it's the single highest point the waveform reaches after 4x oversampling reconstructs the signal between samples, reported in dBTP. Sample peak is the highest raw sample value, with no oversampling applied.

Short-term max looks at loudness over a rolling 3-second window and momentary max over 400 milliseconds, both showing how loud the track gets in its busiest moments rather than on average. Loudness range, LRA, measures how much the loudness varies across the whole track in loudness units: a small LRA means a fairly consistent, compressed level throughout, a large one means quiet and loud sections differ substantially.

Reading the platform table, with an example

Say a file measures -9 LUFS integrated with a -0.3 dBTP true peak. Against the -14 LUFS target used by Spotify, YouTube, Amazon Music and Tidal, the table shows turn down 5 dB. Against Apple Music and Apple Podcasts at -16 LUFS, it's turn down 7 dB, and against the -23 LUFS broadcast target it's turn down 14 dB. The true peak at -0.3 dBTP is also flagged, since it sits above the -1 dBTP ceiling that leaves safe margin for most lossy encoders.

These figures matter because streaming platforms apply their own normalization on playback, turning a file mastered louder than their target back down to match it. Mastering hotter than -14 LUFS for Spotify doesn't make a track play louder there, it only spends dynamic range for no audible gain once the platform's normalization kicks in. Matching the target yourself gets a predictable, intentional result instead of leaving that decision to the platform.

Limits and what this measurement assumes

Measurement follows ITU-R BS.1770-4 and EBU R128, the same standards streaming and broadcast platforms use, on files up to 200 MB and 30 minutes. Because the standard gates out silence and very quiet passages, a very short clip or one that's mostly silence can produce an integrated number that doesn't feel representative, since the gating discards most of what's there before it averages the rest.

This tool measures a file, it doesn't change it. If the numbers say a track needs to come down 5 dB to hit a target, or the true peak needs more headroom, the audio normalizer applies that adjustment automatically to a chosen LUFS target, and the volume booster handles a plain gain change when you don't need to hit a specific number.

LUFS meter blueprint

What each loudness reading and the platform table mean in practice.

InputAn audio file, up to 200 MB and 30 minutes.
OutputIntegrated loudness (LUFS), short-term and momentary max, loudness range (LRA), true peak (dBTP) and sample peak.
MethodITU-R BS.1770-4 / EBU R128 K-weighted, gated loudness measurement; true peak with 4x oversampling.
Range/LimitsPlatform table compares against -14 LUFS (Spotify, YouTube, Amazon, Tidal), -16 LUFS (Apple Music, Apple Podcasts) and -23 LUFS (broadcast).
Best forChecking a master before uploading, matching a podcast or broadcast spec, confirming a true-peak ceiling.
RelatedAudio normalizer to hit a target automatically, volume booster for a plain gain increase.

How to Measure LUFS and True Peak Online

Three steps, all inside your browser

1

Drop in your file

Load an audio file up to 200 MB and 30 minutes long. Loudness is measured on your device, start to finish.

Tips: Measure the final mix or master, not an unfinished one; loudness shifts with every gain or limiting move after this point.

2

Read the numbers

See integrated loudness (LUFS), short-term and momentary max, loudness range (LRA), and true peak (dBTP) alongside sample peak.

Tips: Integrated loudness is the one platforms actually check; the others explain how you got there.

3

Check the platform table

See how far your file sits from Spotify, YouTube, Amazon Music and Tidal (-14 LUFS), Apple Music and Apple Podcasts (-16 LUFS), and broadcast (-23 LUFS), each with a turn down or up by X dB figure.

Tips: Mastering hotter than a platform's target doesn't play louder there; the platform turns it back down on playback.

LUFS Meter Questions

How loudness, true peak and the platform targets work

Streaming platforms like Spotify and YouTube already turn a file down to about -14 LUFS on playback, so mastering hotter than that gains you nothing there, it only spends dynamic range you won't get back. Turning it down yourself with the audio normalizer gets you a predictable result instead of leaving it to the platform.
True peak is measured with 4x oversampling, which catches inter-sample peaks a basic sample peak reading misses, the kind that only appear once a real digital-to-analog converter reconstructs the waveform between samples. A -1 dBTP ceiling leaves enough margin for most lossy encoders used by streaming and podcast platforms to not introduce new clipping of their own.
No. The entire measurement, integrated loudness, true peak, short-term and momentary max and loudness range, runs on your device inside this browser tab. The file is never sent anywhere.
LRA measures how much the loudness varies across the track, in loudness units. A small LRA means a fairly consistent, compressed level throughout; a large one means quiet and loud sections differ a lot, which is normal for something like a classical recording and less common in a heavily compressed pop master.
The BS.1770-4 measurement gates out silence and very quiet passages so a long quiet intro or outro doesn't drag the integrated loudness number down and misrepresent how loud the track feels overall. It's measuring perceived loudness across the parts that actually carry the track, not a simple average of everything.
Use the audio normalizer to match a specific LUFS target automatically, or the volume booster for a plain dB increase when you don't need to hit a specific loudness number.

Fix the loudness you just measured

Match a target automatically or just turn the track up, both running in your browser.

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