Audio Normalizer
AudioMeasure loudness in LUFS and normalize a recording or a video's sound to -16 or -14 LUFS, peaks under -1 dBTP. On your device.
Audio Normalizer measures how loud a recording or a video's sound is — in LUFS, the way Apple Podcasts, Spotify and broadcasters measure it — and writes it again at the level you ask for: -16 LUFS for a podcast, -14 for music streaming, -23 for broadcast, or a level of your own. Where turning it up would push a peak past the ceiling, a limiter holds just those moments under it, and the page says how often and by how much before anything is written; or choose to change only the volume and stop short. A video keeps its picture exactly as it was, and only its sound is written again; a recording is saved as MP3 or WAV, or M4A where your browser can write it. The new file is measured again, so the numbers you are shown are the file's own. It is all done on your device and nothing is uploaded.
Why use Audio Normalizer
100% private
Your audio files are processed locally and never uploaded.
Instant
No upload or download wait — it runs at the speed of your device.
Free to start
Use it free every day; go Pro for unlimited runs.
No install
Works in any modern browser. No sign-up to begin.
How to use Audio Normalizer
- 1Add the recording or video
MP3, M4A, WAV or FLAC sound, or an MP4, MOV or WebM video. Its loudness, loudest peak and range are measured on your device.
- 2Choose the level
-16 LUFS for a podcast, -14 for music streaming, -23 for broadcast, or your own, and how high the peaks may go. The page says how far it turns the sound up or down, and how much limiting that takes.
- 3Normalize and download
It is written at the new level and measured again, so you see the file's own numbers. A video's picture is copied as it is.
Frequently asked questions
What LUFS should a podcast be?
Apple Podcasts asks for about -16 LUFS (it writes LKFS, the same measure), within 1 dB either way, with no true peak above -1 dB. That is the Podcast choice here. Spotify publishes -14 LUFS for music; its page says nothing about podcasts.
Will it make my recording sound squashed?
Only if you ask a lot of it. Most of the time it turns the whole file up or down, which changes nothing but the volume. When a few peaks would pass the ceiling, a limiter holds just those moments under it, and the page says how often and by how much before you write anything. If that is more than you want, choose 'Stop short of the target': only the volume changes, and the file comes out as loud as its loudest peak allows.
Does it even out a loud speaker and a quiet one?
No. It sets the level of the whole recording, and the difference between a loud voice and a quiet one stays as it was; the Range figure says how much the loudness moves. Evening that out is compression, which this does not do. It does not remove background noise either.
Is my video's picture re-encoded?
No. The picture is copied exactly as it is, and only the sound is decoded and written again: as AAC in an MP4 or MOV where your browser can write it, as Opus in a WebM. The video keeps its own format.
How exact is the measurement?
It follows ITU-R BS.1770, the standard behind LUFS, and meets the EBU's own test signals for loudness, loudness range and true peak. Checked against ffmpeg's meter on speech and noise, loudness and peaks agree to within 0.05. A mono recording is measured as it is heard, on both speakers, so a meter that counts its one channel reads it 3 LU quieter.
Is my file uploaded, and does it count as a run?
No upload: it is measured and written in your browser, a piece at a time. Measuring is free; each file written is one run of the daily allowance.