Free loudness meter & streaming preview

Drop a master and instantly see its integrated LUFS, true peak, and dynamic range — plus exactly how much Spotify, Apple Music, YouTube, and Tidal will turn it up or down. Then hear it for yourself.

Drop your master here
WAV, FLAC, AIFF, MP3, AAC — up to 600 MB. Or click to choose.
Analyzed and deleted immediately — never stored, never used to train AI.
Why platforms turn your master down
Spotify, YouTube, and Tidal normalize playback to about −14 LUFS (Apple Music to −16). A master at −8 LUFS gets turned down ~6 dB — so the loudness war buys you nothing but lost dynamics.
True peak ≠ sample peak
Our true peak is measured with 4× oversampling (ITU-R BS.1770), so it catches inter-sample peaks that read as 0 dBFS but clip once encoded to a lossy codec. Keep it under −1 dBTP.
Nothing leaves your hands
Your file is analyzed and deleted on the spot. The preview plays from your own browser — the audio never streams back from us. We never store masters or train AI on them.

Loudness FAQ

What LUFS should I master to for Spotify?

Spotify normalizes playback to about −14 LUFS integrated. A master louder than that is turned down, so there is no loudness advantage above −14 LUFS — aim for around −14 LUFS with a true peak under −1 dBTP, and master for the song rather than for a number.

What is a safe true peak (dBTP) for streaming?

Keep integrated true peak under −1 dBTP. Platforms re-encode to lossy codecs (AAC, Ogg) which can push inter-sample peaks higher, so −1 dBTP of headroom prevents clipping on playback; Amazon asks for −2 dBTP.

What is the difference between LUFS, dBFS and true peak?

LUFS measures perceived loudness over time (what normalization acts on); sample peak (dBFS) is the highest single sample; true peak (dBTP) reconstructs the peaks between samples that a converter or codec will actually produce. A track can sit at 0 dBFS yet exceed 0 dBTP.

Does making my master louder help on streaming?

No. Spotify, YouTube, Tidal, and Amazon turn loud masters down to roughly −14 LUFS (Apple Music to −16), so pushing past that only sacrifices dynamics — the listener hears the same loudness either way.

What loudness targets do Apple Music and YouTube use?

Apple Music normalizes to about −16 LUFS and YouTube to about −14 LUFS. YouTube only turns loud masters down, while Apple's Sound Check adjusts in both directions — so master to the platform reference rather than pushing hot.

Is my uploaded file stored?

No. Your file is analyzed and deleted on the spot, the preview plays from your own browser, and we never store masters or use them to train AI.

Go deeper: streaming loudness targets for every platform · LUFS, true peak & dynamic range explained