Audio Loudness Normalizer
Normalize audio loudness in batches. Set LUFS and true peak targets with sliders, compare real waveforms and measurements, preview A/B and download MP3 or WAV.
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About this tool
Add audio and set target loudness, true peak limit and output format. Two-pass normalization is followed by measurement of the actual exported file. Review tolerance results or failure reasons, switch source and result playback at the same position, and download individual files or all results.
How to use
- Add MP3, WAV, M4A, OGG, FLAC or AAC files.
- Drag the loudness and true peak sliders, choose an output format and start processing.
- Review measurements and waveforms, preview and download. Retry failed files separately.
Frequently asked questions
Is the target loudness guaranteed?
The true peak limit takes priority. Encoding and audio content can constrain loudness. Actual measurements, deviation and tolerance are shown; results outside tolerance are never labeled as within tolerance.
What happens to silent or very short files?
Files with unmeasurable integrated loudness show a clear failure reason. Other files continue processing and failed files can be retried separately.
Are A/B playback and waveforms real?
Waveforms come from the source and exported audio. A/B switching keeps the playback position; source playback uses a compatible MP3 preview copy. Measurements use the source signal and actual output, and waveform comparisons share a timeline and amplitude scale.
How long are files stored?
Sources, preview copies, measurement reports and output are temporary and deleted within 24 hours. You can also delete them immediately.
Discussion & comments
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