Audio normalizer
Measure LUFS and true peak, then bring a whole batch to the same loudness.
How it works
- 01Drop in one file or a whole batch: songs, podcast episodes or videos. Each one is measured in LUFS as it arrives.
- 02Pick a target such as Spotify / YouTube (−14 LUFS) or Podcast, and check the planned gain for each file.
- 03Press Normalize, compare before and after, then download the files one by one or as a zip.
Questions
›What is LUFS?
LUFS (loudness units relative to full scale) measures how loud audio sounds to people, not just how high its peaks reach. This tool measures integrated loudness as described in ITU-R BS.1770 and EBU R128, including the gating that ignores silence and quiet passages, and also reports true peak and loudness range.
›Which target should I pick?
Spotify and YouTube play music at around −14 LUFS, so louder files get turned down anyway. Apple Music aims for about −16 LUFS. Podcasts commonly use −16 LUFS for stereo and −19 for mono. European broadcast follows EBU R128 at −23 LUFS.
›What does the limiter do?
Raising a file to the target can push its peaks above the ceiling (−1 dBTP by default). The limiter turns just those peaks down, watching true peaks with 4× oversampling, so the file gets to (or very close to) the target without clipping. Heavy limiting can leave a file slightly under the target; the after figure shows where each one landed. With the limiter off, those files are raised only as far as their peaks allow.
›How is this different from peak normalizing?
Peak normalizing sets the loudest sample to a level such as −1 dBFS. It is quick, but two files peaked to the same level can still sound very different. LUFS normalizing matches how loud they sound. Both are available here.
›Are my files uploaded anywhere?
No. Your files are processed on your own device by your browser. They never touch our servers, so there are no upload waits, no size caps from us, and nothing to delete afterwards.