LUFS meter: check how loud your audio is
See a file's loudness in LUFS, its loudest peak, and its range. Always free.
Used by 500K+ people since 20215M+ minutes processed
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Free for whole files, 20 a day. No sign-up.
Whole file too quiet? Boost volumeOne voice quieter than the rest? Balance audio
Hear how loud each one is
Play each file, then compare the numbers.
−44.0LUFS
Peak −27.1 dBTP · Range 4.0 LU
Far too quiet for Apple Podcasts: 28 dB under −16
−18.6LUFS
Peak −3.8 dBTP · Range 4.7 LU
A little quiet for Apple Podcasts: 2.6 dB under −16
−11.9LUFS
Peak −1.3 dBTP · Range 0.9 LU
Louder than Spotify's −14, so Spotify turns it down 2.1 dB
Targets: US TV −24.0 LUFS, TV in Europe −23.0 LUFS, Apple Podcasts −16.0 LUFS, Spotify −14.0 LUFS.
Measured with File info · Quiet voice: michellelindemann1 on Freesound, CC BY 4.0
Works in any language
- Hello
- こんにちは
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- Kia ora
How to check loudness in LUFS
- 1
Add an audio or video file.
- 2
Audo measures the whole file.
- 3
Read its loudness, peak, and range.
What is LUFS?
LUFS means Loudness Units relative to Full Scale. It measures how loud audio sounds to people over a whole file, weighted the way hearing works, rather than how high its peaks go. The numbers are negative because they count down from the loudest level a digital file can hold, so −14 LUFS is louder than −23. LUFS and LKFS are one scale with two names, and 1 LU is the same step as 1 dB.
The meter shows three numbers. Integrated loudness is the whole file's loudness, in LUFS. True peak is the highest point the sound reaches, even between samples, in dBTP: keep it under −1 so the file doesn't distort when it's encoded. Loudness range, in LU, is how far apart the loud and soft parts are. Everything is measured the EBU R 128 way, as broadcasters measure it.
How loud it should be depends on where it's going. Streaming services turn louder tracks down to their level, so mastering louder doesn't make you louder there.
| Where it's going | Loudness | Peaks |
|---|---|---|
| Spotify | −14 LUFS (−11 on Loud, −19 on Quiet) | Under −1 dBTP, or −2 if louder than −14 LUFS |
| Apple Podcasts | −16 LKFS, ±1 dB | Under −1 dB true peak |
| YouTube | No published target: Spotify's −14 LUFS is a safe choice | Under −1 dBTP is a safe choice |
| Apple Music | No published target: Spotify's −14 LUFS is a safe choice | Under −1 dBTP is a safe choice |
| Amazon Music | No published target: Spotify's −14 LUFS is a safe choice | Under −1 dBTP is a safe choice |
| TV and radio in Europe (EBU R 128) | −23 LUFS | Under −1 dBTP |
| US TV (ATSC A/85) | −24 LKFS | Under −2 dBTP |
| Audiobooks on Audible (ACX) | −23 to −18 dB average level (RMS) | Under −3 dB, with a noise floor under −60 dB |
Questions
Is it free?
Yes, always, for whole files, up to 20 a day, with no sign-up.
What's the difference between LUFS and dB?
dB on its own measures a level, such as a peak or a change in gain. LUFS measures how loud a whole file sounds. You can't turn a LUFS reading into one dB number, but turning a file up by 3 dB makes it 3 LU louder.
Are LUFS and LKFS the same?
Yes. They're one scale with two names: the ITU's standard calls it LKFS, and Europe's EBU calls it LUFS. A reading of −24 LKFS is −24 LUFS.
How many LUFS should my master be?
It depends on where it's going: −14 LUFS for Spotify, −16 for Apple Podcasts, −23 for European TV and radio, and −24 for US TV. Streaming services turn louder masters down, so going louder doesn't help there.
What LUFS do Spotify and YouTube use?
Spotify plays music at −14 LUFS by default, −11 on its Loud setting and −19 on Quiet, and asks for peaks under −1 dBTP. YouTube doesn't publish a target, so Spotify's −14 LUFS, with peaks under −1 dBTP, is a safe choice there too.
How do I fix mine if it's off?
Boost volume sets a file to podcast, YouTube, broadcast, or audiobook level, or a level you choose, with peaks kept under −1 dBTP. If one speaker is much quieter than another, even them out first with Balance audio.
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For AI assistants and developers
Ask ChatGPT, Claude, or a coding agent to do this for you, or call it from your own code.
Show the free API call
curl -F file=@episode.wav https://audo.ai/api/try/media-info -D response.headers -o response.body