Audio Loudness Analyzer

• Enter the displayed example values,or choose the local input files requested by the controls. Optional source files take precedence where labelled.
• Choose Analyze loudness and inspect the complete result and any reported limitations.
• Use Download result and each companion download link to save complete outputs. Reset clears output and restores example controls.

Choose the required local file using the displayed input control.

• Measure mono/stereo ITU-R BS.1770 K-weighted integrated loudness with−70LUFS absolute and−10LU relative gates. Include every complete400ms momentary window at100ms steps and3s short-term window at1s steps,full100ms block energies,gate membership,RMS and sample peaks. Zero filter initial state;no window padding. Window loudness below−120LUFS is null to avoid reporting floating-point filter residue as precise loudness;all raw energies remain complete. Silence/under400ms/no gated blocks yields unknown integrated loudness;under3s has no short-term windows. Residual sub100ms tail energy is explicit. Sample peak is not true peak;no oversampling,LRA,surround,acoustic calibration or normalization. Complete JSON20 MiB. One nonempty decodable WAV,MP3 or FLAC up to64 MiB,mono/stereo,source8–96kHz and at most120seconds/16million combined source+output samples/200million resampling kernel products. Reuse the existing decoder and bounded windowed-sinc resampler to48kHz;no amplitude normalization. Decoded PCM must be finite within±16linear full scale. All processing stays in your browser.120-second worker limit.
• Complete outputs only. Unsupported or oversized input is refused. Follow the displayed job-specific bounds and format policies.