Automatic mastering Personal mastering How it works Loudness targets

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Learn home Mixing vs mastering Prepare your mix Export your mix Automated or personal LUFS explained Glossary Help center

Every reading, measured in this browser

Free, and it never uploads

Check your mix before mastering.

Q: Which audio tool should I use?

LUFS meter Measure loudness, peaks and dynamics. Streaming preview Hear level changes at platform references. Mix Check Find file issues to review before mastering. Compare masters Judge versions at matched loudness.

Analyze clipping, mono phase, the low end, DC offset and silence before mastering. Review what needs attention, then listen at reference levels. Your audio stays in this browser.

Audio stays in your browserNo account needed

Which audio tool should I use?

LUFS meterMeasure loudness, peaks and dynamics.
Streaming previewHear level changes at platform references.
Mix CheckFind file issues to review before mastering.
Compare mastersJudge versions at matched loudness.

Drag a mix here Choose an audio file It is decoded and measured on this page; nothing is uploaded. wav · flac · mp3 · aiff

Select up to 20 mono or stereo files, 512 MiB each. Long files can reach a separate decoded-memory limit. Your audio stays in this browser.

Nothing is uploaded or saved by Bounce Sessions (staging). Measurements stay on this page. Copy findings if you want to keep or share them.

Start with the moments worth checking.

A measured finding tells you where to look. Your ears decide whether the mix needs a change.

What it measures, and what it does not.

Every check is a measurement with a fixed limit, the same for every file. It does not judge tone, balance, arrangement or performance, and it never compares your mix with other songs. A reading is a reason to listen again, not a verdict: a clean, unclipped file matters more than hitting any one headroom figure.

Mastering takes WAV, AIFF, FLAC or MP3 at 44.1 to 96 kHz: up to 12 minutes, or 6 minutes above 48 kHz. The engine measures your mix again while it masters, and those readings are the ones on the master's page.

See also the pre-master checklist and the LUFS meter. Once the mix is ready, hear a full mastering preview for free. A download uses a credit or active Unlimited; see the plan inclusions.