Free online audio mastering in your browser

music master is an online audio mastering tool that runs entirely in your browser. Drop in a WAV, AIFF or FLAC mix, pick a genre preset and the platform you're releasing on, compare the master with the original at matched loudness, and export a file that's ready for distribution. Your audio is processed on your computer and never uploaded.

What music master does

Genre presets: twelve starting points, from Epic Soundtrack and Orchestral to Pop, Rock, EDM, Hip-Hop, Jazz and Metal, each with its own EQ, bus compression, stereo width and saturation. An intensity control scales the whole preset up or down.
Loudness targets for every platform: −14 LUFS for Spotify, YouTube and Tidal, −16 LUFS for Apple Music, −15 LUFS for Deezer, or any custom target. Loudness is measured to ITU-R BS.1770: integrated LUFS, loudness range and true peak.
True-peak limiter: a lookahead limiter with 4× oversampled peak detection keeps the master under the ceiling between samples too. The ceiling follows the platform: −1 dBTP, or −2 dBTP for masters louder than −14 LUFS, so lossy streaming encodes don't clip.
Graphic EQ: eight bands you drag with the mouse, with the live spectrum of what you're hearing behind the curve.
Honest A/B comparison: original and master play in sync and switch with a short crossfade. With Match loudness on, you judge the tone, not the volume.
Release-ready export: WAV (16-bit, 24-bit or 32-bit float) or MP3 (320 or 192 kbps), sample-rate conversion to 44.1, 48 or 96 kHz, noise-shaped dither, metadata (title, artist, album, ISRC, BWF loudness) and a measurement report.
Album mode: master a set of tracks to a common target, set an offset for each song (a quieter ballad, for example), check the overall album loudness and download everything as a single ZIP.

How to master a track for streaming

Export your mix from your DAW as a WAV file. Leave some headroom: a peak around −3 dBFS is ideal, and the gain is recalculated anyway.
Drop the file into music master and choose the preset closest to your genre.
Choose the platform you're releasing on: the loudness target and the ceiling are set for you.
Listen in A/B with Match loudness on, and fine-tune the EQ, the compressor or the intensity if needed.
Export the master, add the metadata and keep the measurement report with your release files.

Private by design

Analysis, processing and export all run in your browser. Your tracks are never sent to a server, there's no account to create, and nothing is stored online.

FAQ

What loudness should I master to for Spotify?

Spotify plays music at about −14 LUFS integrated and turns louder masters down. A master at −14 LUFS with a true peak at or below −1 dBTP plays back as you made it. If you prefer a louder master, keep the true peak at −2 dBTP or lower so the platform's encoding doesn't clip.

And for Apple Music and YouTube?

Apple Music normalizes to about −16 LUFS, YouTube to about −14 LUFS. Pick the platform in music master and the target is set for you. For dynamic genres such as orchestral music or jazz, the app suggests a gentler target to preserve the dynamics.

What is LUFS?

LUFS (Loudness Units relative to Full Scale) measures how loud a track sounds over its whole length, as defined by ITU-R BS.1770. Streaming services use it to play every song at a similar level, which is why mastering to the right LUFS target matters more than mastering as loud as possible.

Is my music uploaded anywhere?

No. Your files stay on your computer: everything happens locally in the browser.

Which files can I use?

WAV, AIFF and FLAC at 16, 24 or 32 bits, mono or stereo. Mono sources can be exported as stereo (L = R), as many distributors require.

Which browser do I need?

A recent version of Chrome, Edge, Firefox or Safari. A computer is the most comfortable way to use it, but it also works on phones and tablets.