A measure of loudness across a whole song. Many streaming services play music at about -14 LUFS and turn louder songs down to match.

Is this the same as mastering?

No. Normalising sets the overall loudness in one step. Mastering also shapes the sound with EQ, compression, stereo width and a true-peak limiter, and the Mastering tool here does that for free.

Yes. There is no watermark, no account to make and no quota.

No. FFmpeg, the converter, runs in your browser on this device, so the music never leaves it.

Normalize Audio to -14 LUFS: Free, Online

Normalize a song

Press Choose files and pick your song, or a video whose sound you want: WAV, MP3, FLAC, MP4 and more.
Keep Normalise to -14 LUFS (WAV): it measures the whole file and sets its loudness in one pass, as EBU R128 describes.
Press the Convert button and download the WAV, at 44.1 kHz.
For a real master, with EQ, compression and a true-peak limiter, open Mastering.

Questions

What is -14 LUFS?: A measure of loudness across a whole song. Many streaming services play music at about -14 LUFS and turn louder songs down to match.
Is this the same as mastering?: No. Normalising sets the overall loudness in one step. Mastering also shapes the sound with EQ, compression, stereo width and a true-peak limiter, and the Mastering tool here does that for free.
Is it free?: Yes. There is no watermark, no account to make and no quota.
Is my song uploaded?: No. FFmpeg, the converter, runs in your browser on this device, so the music never leaves it.