LUFS Meter — Check the LUFS of a Song, Online Free
Integrated LUFS of the file you drop — not the loudness of the room.
Drop an audio file, or click to browse
MP3, WAV, M4A, OGG, FLAC, and more
Processed locally — your file never leaves this tab
Integrated
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LUFS
Sample peak
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dBFS
Drop a file and read its integrated loudness in LUFS, plus the sample peak. Then match one delivery target: podcast −16, streaming −14, or broadcast −23. The gain is one number for the whole file. If that gain would push the loudest sample past −1 dBFS, it stops there and the page tells you the LUFS you actually reached. This is not a room sound-level meter, and it is not peak normalize. −16, −14, and −23 are common delivery targets, not a legal limit. Processing stays in your browser.
What the number is for
- See whether a voice memo or a mix is near a podcast target before you send it.
- Lift a quiet file toward −16 or −14 without letting the sample peak pass −1 dBFS.
- Check a stereo file as stereo. The two channels are not mixed down before the reading.
How to use the Loudness Meter
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Drop your audio
Any MP3, WAV, M4A, OGG or FLAC file. It is decoded and measured on your device.
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Read the meter
Integrated is the K-weighted loudness of the file, in LUFS. Sample peak is the largest sample, in dBFS. A silent file has no loudness to match.
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Pick a target and export
Podcast is −16, streaming is −14, broadcast is −23. Export MP3 or WAV. If the peak would pass −1 dBFS, the gain stops and the note shows the LUFS you get instead.
A file reading, not a room meter
The number is integrated LUFS: how loud the file is over its length, after the K-weighting in ITU-R BS.1770. It is a property of the file. It is not a reading of the room, and it is not an A-weighted sound-pressure level.
The page also shows sample peak. That peak is not true peak. Inter-sample peaks can still poke past the ceiling on some playback paths.
Targets people actually use
The usual reference points are conventions, not legal limits:
- About −16 LUFS for a spoken podcast.
- About −14 LUFS for a lot of music streaming.
- About −23 LUFS for broadcast-style program loudness.
The gain stops at the peak
If you apply the suggested gain, it stops when the sample peak would pass −1 dBFS. A file can already be peak-normalized and still sit far from −16 LUFS, because one cough sets the peak while the rest stays quiet.
Normalize only chases that peak, to about −0.2 dB. The level compressor is what narrows the gap between loud and quiet. This page measures. It does not pretend a single number makes a master.
Loudness Meter FAQ
Is my audio uploaded?
No. The file is decoded and measured in your browser. After the page loads you can go offline and it still exports.
What does the number mean?
Integrated LUFS is how loud the file is over its length, after K-weighting from ITU-R BS.1770. It is a property of the file. It is not a reading of the room, and it is not an A-weighted sound-pressure level.
How is this different from normalize?
Normalize raises the file until the loudest sample hits a peak. This page matches integrated loudness. A file can be peak-normalized and still sit far from −16 LUFS. Quiet and loud parts stay the same distance apart. The level compressor is the page that narrows that distance.
Are −16, −14, and −23 legal limits?
No. They are common delivery targets: podcasts often ask for about −16 LUFS, music streaming about −14, and broadcast about −23. The page does not claim your file will pass a platform or a broadcaster.
Is the peak a true peak?
No. Sample peak is the largest sample in the file. A true peak needs oversampling and can sit a little higher between samples. This page holds the sample peak at −1 dBFS and does not report dBTP.
Does it work on a phone?
Yes. The three targets and the export button work with touch in current Chrome, Edge, Firefox and Safari.
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