Free LUFS checker
Upload a track and see how loud it really is: integrated LUFS, true peak, loudness range, and how much each streaming service would turn it down. Free, no account.
What the checker measures
| Reading | What it tells you |
|---|---|
| Integrated loudness, LUFS | How loud the whole track sounds — the number streaming services normalize to |
| True peak, dBTP | The highest level between samples; above −1 dBTP, MP3 and AAC versions can distort |
| Sample peak, dBFS | The highest sample value; can read lower than true peak |
| Loudness range, LU | How much the loudness moves between quiet and loud parts |
| Crest factor, dB | Gap between peaks and average level; small numbers mean a heavily limited track |
| Stereo correlation | +1 is mono-like, near 0 is very wide, below 0 can cancel on a mono speaker |
| Streaming preview | How much Spotify, YouTube, Apple Music, TIDAL and Amazon Music would turn the track down |
How to read your result
Around −14 LUFS, true peak below −1 dBTP — ready for streaming as it is. Spotify, YouTube, TIDAL and Amazon Music play it at, or close to, its own level.
Louder than −10 LUFS — streaming services will turn it down by 4 dB or more. It will not sound louder than other tracks there, only more compressed. If true peak is above −2 dBTP as well, the lossy versions may distort.
Quieter than −18 LUFS — normal for classical, jazz and ambient. On services that do not turn quiet tracks up, it will simply play quieter than the playlist around it.
True peak above 0 dBTP — the file already clips when it is converted to analogue or encoded. This is worth fixing before release, whatever the loudness.
How the measurement works
Loudness is measured as defined in ITU-R BS.1770 and EBU R 128: the signal is weighted the way the ear hears, and quiet passages below a gate do not pull the average down. True peak is measured on an oversampled signal, so peaks that fall between samples are caught.
Upload limit is 200 MB per file. The analysis takes a few seconds; the true peak and loudness range arrive a moment after the first numbers.
Numbers look off? Master it
If the track is too loud, too quiet or peaks too high, Echoteka can master it to a Spotify, Apple Music or YouTube target with a −1 dBTP ceiling, and shows the same readings before and after. See loudness targets for every platform and true peak explained.
Is the LUFS checker really free?
Yes. Analysis is free for everyone and needs no account. Only mastering needs a free account: 3 masters when you sign up, then 1 every month.
Which file formats can I check?
WAV, FLAC, MP3, M4A, OGG and AMR. Check the file you are about to release: a WAV export and an MP3 made from it can differ in true peak.
Is the result the same as in my DAW meter?
Integrated loudness is measured to the same ITU-R BS.1770 method most loudness meters use, so the numbers should agree within a few tenths of a dB. Short-term and momentary readings in a DAW will move around more.
What should my track measure?
For streaming, about −14 LUFS integrated with true peak below −1 dBTP is a safe single master. Louder is fine if you like the sound, but keep true peak below −2 dBTP.