Pick a folder. Check the numbers. Press level.
LevelAudio measures how loud every track feels, shows you the numbers, then moves each track up or down to one target. It all happens in your browser tab, on your own files.
Your library, as it is
Any folder: subfolders, mixed formats and thousand-track collections welcome. Or pick single files.
Feel, not just peaks
Every track gets a loudness and true-peak reading, and a bar showing how far it is from your target. Click any track to hear the before and after.
Gain, nothing else
Quiet tracks come up, loud ones come down, and the mix stays as mixed. Nothing is written until you press normalize.
Gain, nothing else
LevelAudio applies pure gain: the whole track moves up or down together, like turning the volume knob once and leaving it. No compression, no limiting, no pumping. The quiet intro and the loud chorus keep exactly the distance the mix gave them.
If a track can't reach the target without its peaks clipping, it gets less gain and the app tells you, rather than squashing it. How loudness is measured.
The gentlest method for each file
- MP3: only the gain field in each frame is rewritten (the mp3gain technique). No re-encode, tags and album art kept byte for byte, and the change is exactly reversible. It works in 1.5 dB steps; switch MP3 handling to “re-encode for exact volume” if you want the exact target.
- WAV, and all measuring: LevelAudio’s own BS.1770-4 code, sample-exact at the file’s own bit depth, off the main thread.
- FLAC and everything else: a bundled FFmpeg (WebAssembly) re-encodes at the file’s own bit depth and sample rate. It is downloaded only when a file needs it, and runs on your device like the rest.
The app names the method used for every file.
Where the results go
- A new
normalizedfolder next to your files (the default). Your originals stay as they were. - In place, replacing the originals, if you ask for it. Keep backups: there is no undo button.
- A folder you choose, a ZIP download, or, on phones, the share sheet (Save to Files, Drive…).
Chrome and Edge on a computer can write straight into folders. Firefox and Safari read folders fine and hand the results back as a ZIP.