LUFS stands for Loudness Units relative to Full Scale. It is the standard measurement for perceived loudness. -14 LUFS is the loudness target used by Spotify and YouTube.

Does normalization affect audio quality?

Loudnorm re-encodes the audio, so there is a small quality reduction. For most practical uses, this is not audible. If you need completely lossless output, use WAV as the output format.

Can I batch normalize multiple files?

Yes. Add multiple files at once and they will all be normalized to the same target level.

Are my files uploaded to a server?

No. All normalization runs in your browser using WebAssembly. Your files never leave your device.

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Audio Volume Normalizer Online Free

Balance the loudness of audio files to a consistent target level using EBU R128 normalization. Set a target between -30 and -6 LUFS. Spotify and YouTube use -14 LUFS; broadcast TV uses -23 LUFS. Batch process multiple files at once. Everything runs in your browser using FFmpeg.wasm.