Professional Audio Mastering with Real-Time Control

Industry-standard LUFS targeting, advanced parameter control, and instant preview. Master your music with precision that other platforms can't offer.

This page needs JavaScript for the tool itself. Open it in a browser to upload a file.

How it works

Upload a mixed track (WAV, MP3, FLAC or AIFF), choose a genre preset, set your loudness target and preview the result before you download. The master is delivered as a WAV file ready for Spotify, Apple Music and YouTube.

Mastering guides in the Learn section

What the tool does

Spectral balancing, gentle glue compression, true-peak limiting and loudness targeting in LUFS, with the parameters exposed so you can adjust them and hear the difference in real time.

Free for independent artists

There is no charge for mastering a track and no subscription. Create an account to keep your masters in your dashboard.

Learn about loudness and mastering

Not sure what LUFS means or how a mastering chain is ordered? The Learn section has plain-language guides on mastering for Spotify, peak limiting, the mastering chain and mastering vocal-led acoustic tracks.

Mastering guides

Featured releases

All releases

Latest guides

All guides

Questions people ask

Is the online mastering tool free?

Yes. Mastering a track is free, with no subscription and no hidden fees. An account keeps your masters in your dashboard.

What loudness does the tool target?

Loudness is measured in LUFS and you set the target. Around minus 14 LUFS suits streaming platforms; the tool also controls true peaks so the master does not clip after encoding.

Which file formats can I upload?

WAV, MP3, FLAC and AIFF. Upload the final mix with a few decibels of headroom rather than a limited or already mastered file.