Updated October 2026 · Loudness and levels
Loudness normalization adjusts the playback level of each file so that different files sound at a similar loudness. Players and platforms measure each file, then turn it up or down. You can prepare for it by setting your file to a sensible target, and by leaving headroom for the adjustment.
When you play a playlist and the songs sound roughly the same level, you are hearing loudness normalization at work. A player or a platform measures each file, then adjusts the playback level so it lands near a common target. The idea is simple, but it changes how your audio sounds, and it rewards a well-prepared mix.
The player measures the loudness of each file, usually in LUFS. It compares that figure with its target, then applies a gain change during playback. A file that is much louder than the target is turned down. Whether a quiet file is turned up depends on the player and its settings. The original file is not changed.
Normalization means that a very loud, heavily compressed file may not sound louder than a quieter, more dynamic one. The loud file is turned down, and its extra level is removed. A file that is quiet and dynamic may sound natural after normalization. Mixing for the loudest possible level no longer makes the file sound louder to listeners.
Platforms differ in their targets and their settings, and they change over time. Check the current guidance from each platform before you publish. The loudness guide explains the common approach for online video and audio.
Normalization is not a substitute for a good mix. It can reduce loudness, but it cannot fix a muddy voice or a noisy recording. Use it as a guide to what listeners will hear, and check your work on the devices they use.
Integrated LUFS, true peak and streaming targets. Runs in your browser, nothing is uploaded.
Not usually. The player adjusts the playback level, and the original file stays the same.
No. A file mixed for maximum loudness can sound worse after normalization.
No. Targets and settings differ and change over time, so check each platform.
It can. Platforms may adjust the level of each episode, so set a steady target before you publish.
