To normalize a batch of files, we built NORMLZ
Here’s what it does:
3 normalization modes:
- True Peak (dBTP) — 4× oversampled intersample peak detection per ITU-R BS.1770-4. Prevents clipping on phone speakers, streaming decoders, and D/A converters that reconstruct between samples.
- RMS — classic average loudness normalization. Great for keeping a folder of samples at consistent perceived volume.
- LUFS (Integrated) — broadcast/streaming standard. Hit Spotify’s −14 LUFS, YouTube’s −14 LUFS, or any target you need.
Other stuff:
- Brickwall limiter with adjustable ceiling
- Lanczos-3 resampler for high-quality sample rate conversion (44.1 → 48 kHz etc.)
- Export to 16-bit, 24-bit, 32-bit int, or 32-bit float WAV
- Set a destination folder once — all files write directly there with zero save dialogs
- Import an entire folder of audio in one click
- Processes everything locally in your browser. Your audio never leaves your machine.
Who is this actually useful for:
- Podcast editors batch-normalizing episode recordings
- Sample pack creators hitting consistent RMS across a library
- Music producers prepping stems for streaming delivery at −14 LUFS
- Sound designers who just want everything at the same level without opening a DAW