Free Tool

LUFS & True Peak Meter

Drop in a track and see its integrated loudness (LUFS) and true peak, measured to the ITU-R BS.1770 standard - then compare it to streaming targets. Everything runs in your browser; nothing is uploaded.

Drop an audio file or click to upload

WAV, MP3, FLAC, M4A - analyzed in your browser, nothing uploaded

What this meter measures

Integrated LUFS is the loudness of your whole track, measured the way streaming platforms measure it. It is the number that decides whether your song plays at a competitive level next to everything else in a playlist. True peak is the real peak level after accounting for the inter-sample peaks that appear when audio is encoded to a lossy format - the thing that makes a master clip once it is streaming even though it looked safe in your DAW.

The targets that matter

  • Spotify, YouTube, Tidal, Amazon: around -14 LUFS integrated.
  • Apple Music: about -16 LUFS integrated.
  • True peak: keep the ceiling around -1 dBTP so lossy encoding does not clip.

If your track is far under the target it plays quiet and lifeless; if it is crushed far over, the platform turns it down and you lose dynamics for nothing. For the full explanation, read what LUFS to master to for streaming and true peak explained.

FAQ

What is a good LUFS level for streaming?

Aim for around -14 LUFS integrated for Spotify, YouTube, Tidal and Amazon Music, and about -16 LUFS for Apple Music. These platforms normalise playback to those targets, so mastering far above them just gets turned back down.

What is true peak and why keep it under -1 dBTP?

True peak accounts for the inter-sample peaks that appear when audio is encoded to a lossy format like AAC or Ogg. Leaving about 1 dB of headroom (a -1 dBTP ceiling) stops that conversion from clipping and distorting your track.

Is my audio uploaded anywhere?

No. The meter analyses your file entirely in your browser using the Web Audio API - the audio never leaves your device and nothing is uploaded to a server.

How accurate is this loudness meter?

Integrated loudness follows the ITU-R BS.1770-4 measurement with absolute and relative gating. True peak is a 4x-oversampled estimate, which is the standard way to approximate inter-sample peaks in software.