MixMasterAIAudio Normalizer (LUFS)
Loudness normalization is what every streaming service does to your track on playback — Spotify, Apple Music, YouTube, Tidal all measure integrated LUFS and adjust playback gain so listeners don't have to ride the volume between tracks. Pre-mastering to the target gives you control over what they play; otherwise the platform decides.
Single-pass loudnorm. For mastering-grade accuracy, run a measurement first with the LUFS Meter, then apply a precise gain.
How it works
Drop the file
Music, podcast, voice — any audio file the browser can decode.
Up to 200 MB
Pick a loudness target
-14 LUFS for Spotify / YouTube / Tidal. -16 LUFS for Apple Music / podcasts. -23 LUFS for EBU broadcast. -10 LUFS if the file is going somewhere with no normalization (SoundCloud, club PA).
ffmpeg filter: loudnorm=I=target:LRA=11:tp=-1.5
Normalize
ffmpeg measures the integrated loudness, applies the gain offset, and limits true peaks to -1.5 dBTP so peaks don't clip after the boost. Output is 16-bit WAV.
Single-pass · transparent for most material
Frequently asked questions
What's the right LUFS target for me?
Match the platform you're delivering to. Spotify, YouTube, Tidal, Amazon Music: -14 LUFS. Apple Music: -16 LUFS. Podcasts: -16 LUFS (Apple) or -19 LUFS (Audible/ACX). Broadcast TV: -23 LUFS (EBU R128). SoundCloud and club playback don't normalize, so masters there sit at -8 to -10 LUFS.
What does single-pass loudnorm trade away?
Single-pass measures and adjusts in one go — fast, transparent, but accuracy is ±0.5 LU around the target. Two-pass measures the file once, then re-encodes with a more precise gain — usually within ±0.1 LU. For most material the difference is inaudible. For mastering deliverables where the LUFS spec is contractual, run a measurement pass with the LUFS Meter and apply gain manually.
Will it clip the peaks after boosting?
No. The loudnorm filter runs a true peak limiter at -1.5 dBTP after the gain stage, so peaks stay safely below clipping even when the file is being boosted to a much higher loudness.
Does Spotify normalization actually do anything to my file?
Spotify doesn't change your file on the server. They measure your integrated LUFS at upload, store the offset, and apply it on playback so users hear consistent loudness across tracks. Pre-mastering to -14 LUFS means listeners hear the loudness you intended; submitting a +6 LU louder file means they hear it 6 LU quieter than you intended (Spotify's algorithm pulls it down).