What is integrated LUFS?
It is a gated, K-weighted estimate of average perceived loudness across the measured program, expressed relative to full scale.
Measure audio loudness in LUFS
Choose a mono or stereo audio file and StudioEditor will measure its K-weighted integrated loudness in LUFS plus its sample peak, entirely in your browser.
No server upload. No account. No AI-tool credits.
What this free tool does
- Integrated LUFS measurement
- BS.1770 K-weighting
- Two-pass loudness gating
- Sample peak measurement
- Local browser analysis
A useful loudness check with clear limits
The meter uses the same 48 kHz K-weighting coefficients and two-pass integrated-loudness gate used by StudioEditor’s render analysis, with continuous filter state across the file.
Integrated LUFS describes average program loudness more usefully than waveform height or a single peak. Compare it with a delivery reference, then listen before deciding whether gain or dynamics should change.
The peak result is sample peak rather than oversampled true peak. Use a calibrated compliance meter when a regulated broadcaster requires certified measurement.
Frequently asked questions
Does the meter upload my audio?
No. Decoding, resampling when needed, filtering, and measurement all run in the current browser.
Is the peak value true peak?
No. It is sample peak in dBFS. True-peak measurement oversamples between stored samples and can report a higher value.
Which files are supported?
Use mono or stereo audio in a format the current browser can decode, such as MP3, WAV, M4A, AAC, OGG, FLAC, or WebM.