Three simple steps
How to check audio loudness online
- 01
Choose a music, podcast or other audio file from your device.
- 02
Keep this page open while your browser analyzes the file locally.
- 03
Review integrated loudness, short-term and momentary maximums, loudness range and estimated true peak.
What is LUFS?
LUFS means Loudness Units relative to Full Scale. It describes perceived audio loudness rather than just the highest sample level. A less negative value is louder: −10 LUFS is louder than −20 LUFS. Integrated LUFS summarizes loudness across the analyzed recording.
Understanding your loudness results
Short-term loudness uses roughly three-second windows; momentary loudness uses roughly 400-millisecond windows. This tool shows the maximum of each. Loudness Range (LRA), in LU, describes variation over the track. Estimated true peak, in dBTP, approximates peaks between digital samples.
A quick check, with clear limits
This implementation applies K-weighting and loudness gating, and estimates inter-sample peaks using cubic interpolation. It is not a certified standards-compliance meter. Very short or silent clips offer little useful information, and the current analyzer is intended for mono or stereo files. Verify critical delivery requirements with a validated professional meter.
Should every track hit the same LUFS target?
No single loudness target suits every recording or delivery requirement. Normalization behavior varies between services and playback settings. Use these readings to compare your own versions, preserve the dynamics you want and check the current requirements of your intended destination.
A little more clarity
Frequently asked questions
Is this an audio normalizer?
No. The LUFS Meter measures your file and displays estimates. It does not change its volume, compress it or export a normalized version.
Is my audio uploaded?
No. Decoding and loudness analysis happen in your browser. The analyzer does not send your audio file to a server.
What is the difference between LUFS and peak level?
LUFS describes perceived loudness over time. Peak level describes the highest signal level. Two tracks can have similar peaks while sounding different in overall loudness.
Can I use it for broadcast compliance?
Use it for quick checks and comparisons. The current implementation has not been validated as a compliance meter; verify final broadcast or other strict delivery requirements using a validated professional tool.
Why do very short or silent clips give unusual results?
Loudness analysis needs enough audio for its measurement windows. Short-term readings need roughly three seconds, and silence does not provide meaningful loudness or dynamic-range information. Analyze a representative recording rather than a tiny clip.
Built with open-source foundations
The analysis approach is adapted from Tonalux Analyzer. See our open-source acknowledgements. Results are estimates; limitations are described above.