Free LUFS Meter & True Peak Checker
Drop an audio file to measure integrated loudness (LUFS), true peak (dBTP) and dynamics — then see how it stacks up against Spotify, Apple Music, YouTube and sync delivery targets.
Drop an audio file here
or click to choose — WAV, MP3, FLAC, M4A, OGG
🔒 Your file never leaves your browser. Analysis runs locally with the Web Audio API — nothing is uploaded.
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How it compares to platform targets
| Platform | Target | Your track |
|---|
The numbers tell you where you stand. TuneLens tells you what to do about it — a full AI breakdown of your mix, mastering, and sync readiness with prioritized fixes.
Get the full AI breakdown free →What this meter measures
Integrated LUFS
Perceived loudness across the whole track, measured to the ITU-R BS.1770-4 standard with K-weighting and dual gating — the same method streaming platforms use to decide how loud your song plays back.
True Peak (dBTP)
The real maximum level between samples, measured with 4× oversampling. A master can read 0 dBFS yet clip once it's encoded to MP3 or AAC — true peak catches that before listeners hear distortion.
Crest Factor
The gap between peak and average level, a quick read on how dynamic or squashed your master is. Low crest factor means heavy limiting; a healthy crest factor leaves the music room to breathe.
Loudness targets that matter
Every streaming service normalizes playback to a target loudness, so chasing a louder master no longer wins the loudness war — it just gets turned down. Master to the platform that matters most to you, and keep true peak at or below −1 dBTP to avoid inter-sample clipping on lossy formats.
| Platform | Loudness target | True peak ceiling |
|---|---|---|
| Spotify | −14 LUFS | −1 dBTP |
| Apple Music | −16 LUFS | −1 dBTP |
| YouTube | −14 LUFS | −1 dBTP |
| Amazon Music | −14 LUFS | −2 dBTP |
| Tidal | −14 LUFS | −1 dBTP |
| Sync / Broadcast (EBU R128) | −23 LUFS | −1 dBTP |
Frequently asked questions
What is a LUFS meter?
A LUFS meter measures perceived loudness using the ITU-R BS.1770 standard. LUFS (Loudness Units relative to Full Scale) reflects how loud a track actually sounds, unlike peak meters which only show the highest sample. Streaming platforms normalize to a target LUFS, so your integrated LUFS tells you how loud your song will play back.
What LUFS should I master to for Spotify?
Spotify normalizes to around −14 LUFS integrated. Masters louder than that are turned down on playback. Apple Music targets about −16 LUFS, while sync and broadcast delivery (EBU R128) usually requires −23 LUFS. Master for the platform you care about most and keep true peak at or below −1 dBTP.
What is true peak (dBTP) and why does it matter?
True peak measures the real maximum level of the waveform between samples, after reconstruction or lossy encoding. A track can read 0 dBFS on a normal peak meter but exceed it once converted to MP3 or AAC, causing inter-sample clipping. Most platforms recommend −1 dBTP or lower. This meter uses 4× oversampling.
Is this LUFS meter free and private?
Yes. It's completely free and runs entirely in your browser using the Web Audio API. Your audio file is decoded and analyzed locally and never leaves your device or gets uploaded to a server.