Audio Normalizer (LUFS)
Normalize audio to streaming (-14 LUFS), podcast (-16 LUFS) or broadcast (-23 LUFS / EBU R128) loudness using the ffmpeg loudnorm filter. Runs entirely in your browser.
Quick answer: Normalize audio to streaming (-14 LUFS), podcast (-16 LUFS) or broadcast (-23 LUFS / EBU R128) loudness using the ffmpeg loudnorm filter. Runs entirely in your browser.
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Frequently asked questions
- What is LUFS and why does it matter?
- LUFS (Loudness Units relative to Full Scale) is the modern way to measure perceived loudness — it weights frequencies the way human ears do, so it tracks 'how loud something sounds' instead of 'peak digital level'. Streaming platforms normalize every track to a target LUFS so you don't have to keep adjusting volume between tracks.
- Which target should I pick?
- -14 LUFS for music going to Spotify, YouTube or Apple Music (their playback target). -16 LUFS for podcasts (Apple Podcasts target). -23 LUFS for TV broadcast (EBU R128, the European standard). When in doubt for music: -14 LUFS.
- Is this the same as 'normalize to peak'?
- No — peak normalization just maxes out the loudest sample. LUFS normalization adjusts perceived loudness across the whole track, which is what your ears actually care about. A jazz piano piece and a death metal track at the same peak can be 20 dB apart in LUFS.
- Is my audio uploaded?
- No. ffmpeg.wasm runs entirely in your browser. The file never leaves your device.
- Will it clip or distort?
- No — the loudnorm filter respects a true-peak ceiling (-1 dBTP for streaming, -2 dBTP for broadcast) so even after the loudness boost there's headroom against inter-sample peaks that would clip on consumer DACs.
- Can I lower a too-loud track?
- Yes — loudnorm cuts gain just as easily as it adds it. A track that was mastered too hot at -8 LUFS will be turned down to your chosen target.
- What output formats are supported?
- MP3 (libmp3lame), WAV (PCM 16-bit), M4A (AAC) and FLAC (lossless). Pick FLAC if you'll re-process the audio further; MP3 192 kbps is the safe default for distribution.
- What's the maximum file size?
- 200 MB. That covers ~3 hours of MP3 or ~30 minutes of WAV — enough for most podcast episodes and album-length music.
- Will it normalize multiple tracks to the same loudness?
- Yes — that's the whole point. Run each track through the tool with the same target and they'll all play back at the same perceived level.
- Is loudness normalization the same as a limiter or compressor?
- No. A limiter or compressor changes dynamics frame-by-frame. Loudness normalization measures the whole file then applies a single gain that brings it to the target — it doesn't change the dynamic range, just the overall level.