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LUFS Loudness Analyzer
Analyze the loudness of your audio files client-side. Get integrated LUFS, peak level in dBFS, and dynamic range measurements to match YouTube or Spotify specs.
Drag & drop your audio file here
Supports WAV, MP3, M4A, OGG, WebM up to 100MB
Decoding audio data... 0%
All processing is performed locally in your browser. Your files are never uploaded.
filename.mp3
Stereo · 44.1 kHz · 03:00
Integrated Loudness
-14.0 LUFS
Overall perceived volume level
True Peak Level
-1.2 dBFS
Maximum signal amplitude
Dynamic Range
8.5 LU
Variance in loudness levels
Streaming Normalization Penalty check
YouTube
Normalizes music/videos to -14 LUFS (Target: -14 LUFS)
-- Status
Spotify
Standard playback normalization (Target: -14 LUFS)
-- Status
Apple Music
Sound Check target level (Target: -16 LUFS)
-- Status
Podcast / Broadcast
EBU R128 international standard (Target: -23 LUFS)
-- Status
Loudness Waveform Profile
Visualization of perceived loudness variations over the length of the track.
What is the LUFS Loudness Analyzer?
The LUFS Loudness Analyzer is a professional browser-based audio utility designed for content creators, YouTube video editors, and audio mastering engineers. It measures the integrated loudness (in LUFS), maximum true peak (in dBFS), and loudness range (in LU) of your audio files entirely client-side.
Unlike traditional peak level meters, LUFS (Loudness Units relative to Full Scale) accounts for human frequency sensitivity by applying a K-weighting curve. This ensures the output reflects perceived volume rather than absolute wave voltage.
Knowing your integrated LUFS is essential before publishing to platforms like YouTube, Spotify, or Apple Music, which automatically apply gain normalization. This tool allows you to measure and match their targets precisely, without uploading your audio files to external servers.
How to Analyze Your Audio
- Drag and drop your audio file (MP3, WAV, M4A, OGG) into the upload container above.
- The browser decodes the file using the local Web Audio context (no server uploads).
- Wait as the progress bar displays the gating and K-weighting calculation progress.
- Review the integrated LUFS value, dynamic range, and streaming platform normalization results.
- Use the loudness waveform graph to identify sections that might be excessively compressed or dynamic.
Streaming Loudness Targets Compared
Every major audio and video distribution network operates a loudness management protocol. If your audio exceeds their target loudness, they turn down the overall volume (often referred to as a "normalization penalty"). Here are standard targets:
| Platform | Loudness Target | True Peak Limit |
|---|---|---|
| YouTube | -14 LUFS | -1.0 dBFS |
| Spotify (Normal) | -14 LUFS | -1.0 dBFS |
| Apple Music | -16 LUFS | -1.0 dBFS |
| Tidal | -14 LUFS | -1.0 dBFS |
| Broadcast / Podcast (EBU R128) | -23 LUFS | -2.0 dBFS |
If your audio file registers at -10 LUFS and you upload it to YouTube, it will be turned down by 4 dB. To preserve punch and dynamic range, it is recommended to master your audio close to the target of the platform.
Frequently Asked Questions
What is LUFS?
LUFS stands for Loudness Units relative to Full Scale. It is an industry-standard unit used to measure the perceived loudness of audio. Unlike peak level meters, which only measure the absolute highest point of a sound wave, LUFS measures loudness over time, matching how the human ear actually perceives volume.
Why is integrated LUFS important for streaming platforms?
Major streaming platforms like YouTube, Spotify, Apple Music, and Tidal use loudness normalization to ensure that all songs and videos play at a consistent volume. If your audio is louder than their target (usually -14 LUFS), the platform will turn it down. Knowing your LUFS prevents unexpected gain reduction or squash.
What are the LUFS targets for YouTube, Spotify, and Apple Music?
The standard targets are: YouTube at -14 LUFS, Spotify at -14 LUFS, Apple Music at -16 LUFS, Tidal at -14 LUFS, and TV broadcast (EBU R128) at -23 LUFS. Targeting these specifications ensures your audio matches standard commercial listening expectations.
Is my audio uploaded to a server for LUFS analysis?
No. Our LUFS Loudness Analyzer runs entirely in your browser using the Web Audio API. Your audio files are processed locally on your computer and are never sent to any server. This guarantees 100% privacy and instantaneous results.
What is the difference between peak level (dBFS) and LUFS?
Peak level (measured in dBFS, or Decibels relative to Full Scale) represents the maximum instantaneous voltage or sample value of an audio signal. LUFS represents the integrated average energy over the entire length of the file, weighted to match human frequency sensitivity. Audio can peak close to 0 dBFS but still sound quiet if its LUFS is low (e.g. -20 LUFS).
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