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Ubify Media & Design Operations
UI/UX & DIGITAL MEDIA SPECIALISTS
About This Tool
Streaming platforms and television networks normalize audio loudness to prevent listeners from having to constantly adjust their volume knobs. This tool executes ITU-R BS.1770 K-weighted algorithms in browser memory to compute Integrated LUFS and True-Peak dBTP with exact gain correction offsets for Spotify (-14 LUFS) and Broadcast TV (-24 LUFS).
How to Use
- 1
Drop your unmastered or mastered audio file (.wav, .mp3, .flac, .aac).
- 2
View calculated K-weighted Integrated Loudness in LUFS and True Peak in dBTP.
- 3
Check compliance indicators for Spotify (-14 LUFS), Apple Music (-16 LUFS), and ATSC A/85 TV (-24 LUFS).
- 4
Apply the recommended gain adjustment in dB to your mastering limiter before distribution.
Frequently Asked Questions
What is the difference between RMS and LUFS?
Root Mean Square (RMS) measures mathematical electrical energy evenly across all frequencies. LUFS (Loudness Units relative to Full Scale) applies K-weighting curves that simulate human ear sensitivity (Fletcher-Munson curves), prioritizing midrange frequencies that sound naturally louder.
Why does Spotify penalize masters louder than -14 LUFS?
Spotify's loudness normalizer automatically turns down songs that exceed -14 LUFS. If a track is mastered to -8 LUFS with an unconstrained true peak near 0 dBTP, Spotify's limiter will attenuate it by -6 dB, squashing dynamic transients.