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utility
LUFS Meter Online
Check the loudness of any audio file in seconds. Free, private, runs in your browser.
How it works
01
Drop your audio file or click to upload. MP3, WAV, and most formats work.
02
The meter measures integrated loudness in LUFS and peak level in dBFS, all in your browser.
03
Compare the result against Spotify, YouTube, Apple Podcasts, and broadcast targets. Normalize with one click if you need to hit a target.
No file uploadNo signupNo ads100% browser-based
Frequently asked questions
How do I check the LUFS of a song?
Upload the file to this meter. It measures integrated loudness in LUFS and shows the result in a few seconds, along with the peak level and a comparison against common platform targets. No account and no upload to a server.
What is a good LUFS level?
It depends on where the audio will play. Spotify and YouTube normalize to -14 LUFS. Apple Podcasts recommends -16 LUFS. Broadcast uses -23 LUFS under EBU R128. The meter shows how far your file sits from each of these.
What is the difference between LUFS and dB?
dBFS measures the level of individual samples against the digital maximum. LUFS measures perceived loudness over time, weighted the way human hearing works. Two files can have the same peak in dB and sound very different in loudness, which is why platforms use LUFS.
What does integrated loudness mean?
Integrated loudness is the average loudness across the whole file, measured with K-weighting per ITU-R BS.1770. It is the number streaming platforms look at when they decide to turn your track up or down.
Why does Spotify turn my track down?
Spotify normalizes playback to -14 LUFS. If your master is louder than that, Spotify reduces it. Check your file with this meter: if it reads above -14 LUFS, the difference is roughly how much Spotify will turn it down.
Does this LUFS meter upload my audio?
No. The ITU-R BS.1770 loudness measurement runs locally in your browser using the Web Audio API. Unlike desktop tools that require a license server check-in, this meter works entirely offline once the page loads.
Can I fix my loudness after measuring it?
Yes. The LUFS Normalizer tool takes the same file and adjusts it to any target you pick, with presets for Spotify, YouTube, Apple Podcasts, and broadcast. A button below the reading takes you straight there.
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