Normalize audio loudness

What loudness normalization does

Normalization measures how loud a recording sounds to people, in LUFS, and turns it up or down to hit a target. It is different from a plain volume boost, which multiplies every sample by the same amount and can push peaks into distortion. Normalizing to a target makes a set of episodes, songs or clips play at the same level, so listeners don't reach for the volume between them.

How to normalize audio

Drop an audio file above and set the target loudness. The default is -16 LUFS. Press Normalize loudness. FFmpeg's loudnorm filter, the EBU R128 method, runs in your browser and adjusts the level while keeping peaks under -1.5 dBTP so the file doesn't clip on playback. The result is saved as an MP3 at about 190 kbps.

Which LUFS target to choose

Pick the target for where the audio will be played:

• -16 LUFS for podcasts and spoken audio, the level Apple recommends for podcasts.
• -14 LUFS for music on Spotify, YouTube and most streaming services, which turn louder tracks down to about this level.
• -23 LUFS for broadcast work under the EBU R128 standard.
• -19 LUFS for mono speech when you want it to sound as loud as -16 LUFS stereo.

Before you start

Input: MP3, WAV, FLAC, M4A, AAC, OGG, OPUS, WEBM, and AMR. Output: normalized MP3. The settings appear before anything runs, so you can check them first. Your original file is never changed.

Converting audio can change the codec, bitrate, channels, tags and length. Listen to the start and end of the result. Keep a lossless original if you may edit it again.

Keep the original until you have opened and checked the result. The work happens in this browser tab, so the size you can handle depends on your device's memory, your browser and the file itself.

How to normalize audio loudness

1. Drop audio to normalize.
2. Pick the settings you want.
3. Press the action button, then download the normalized MP3.