Free tool
Normalize audio to −14 LUFS, free.
Quiet voice up, loud music down, every file at the loudness YouTube, Spotify and podcast apps expect.
Normalize audio at a glance
content.win measures loudness the way the platforms do, in LUFS, and fixes it, free.
- Works with
- MP3, WAV, M4A, OGG and FLAC.
- Comes back as
- The same audio at a target loudness in LUFS, with a true-peak ceiling.
- Runs
- In your browser.
- Limits
- No daily limit and no cap on how many files.
- Price
- Free. No account, no watermark.
How to normalize audio loudness
- Drop the files in. Podcast episodes, voice-overs, music, or videos you only need the audio from.
- Pick the target. −14 LUFS for YouTube and social, −16 for podcasts. Keep the −1 dB ceiling.
- Download. Each result shows what it measured before and the gain applied.
Loudness targets by platform
- YouTube, Spotify, TikTok, Instagram
- −14 LUFS. Louder uploads are turned down, so mastering hotter buys nothing.
- Apple Podcasts, Spotify podcasts
- −16 LUFS, peaks under −1 dB. Speech sits comfortably here on phone speakers.
- Amazon Music, Tidal
- −14 LUFS. Deezer −15.
- Broadcast TV in Europe, EBU R128
- −23 LUFS, peaks under −1 dBTP. US broadcast, ATSC A/85, −24.
- Between your own clips
- Same target for every file and the edit stops jumping in volume between segments.
Good to know
- Loudness is measured with the same K-weighted method the standards use.
Questions people ask
What is LUFS?
Loudness Units relative to Full Scale, the measure streaming platforms use for how loud a track feels, not just its peaks. YouTube and Spotify play everything at about −14 LUFS; Apple Podcasts asks for −16; TV broadcast uses −23. If your file is quieter than the target, the platform leaves it quiet; if it's louder, the platform turns it down.
Which target should I pick?
−14 LUFS for YouTube, Spotify, TikTok and Instagram. −16 for podcasts on Apple and Spotify. −23 only if a broadcaster asks. When in doubt, −14.
What does the peak ceiling do?
It stops the loudest samples from clipping. −1 dB is the standard safety margin; MP3 encoding can push peaks up slightly, and −1 leaves room.
Why did it say it couldn't reach the target?
A very dynamic recording, quiet on average with big peaks, would clip if pushed all the way up. The tool raises it as far as the ceiling allows and tells you. A compressor in an editor would close the rest of the gap.
Is it the same as making everything the same volume?
It matches the overall loudness of each file to the target. It doesn't level the quiet and loud parts inside a file; that's compression, which changes the sound more than most people want from a one-click tool.