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Bring your mix through its final stages.

Online music mastering with a shared place for tracks, revisions, and feedback.
Master a track
No credit card required

A clear path from mix to master.

Upload a track, listen to the result, and keep revisions and feedback together.

Upload your track

Supports both WAV and MP3 formats.

Master your mix

Choose your settings and let Maastr process a new master.

Listen and compare

Hear the master alongside your mix before downloading.

Hear your mix and master side by side.

Constant Pressure · Relate

Music collaboration that actually makes sense.

Problem

Feedback, revisions and version histories get scattered across files and messages.

Solution

Maastr is the operating system for your studio. Share tracks, manage versions and get feedback in one place.

Loudness with room for character

Choose a mastering direction, then listen against your original mix before deciding.
Master a track

An online mastering workflow

Use Maastr’s mastering process without setting up plugins, then listen and decide.
Master a track

Keep every revision in one place

Compare versions, collect feedback, and preserve the context around each master.
Master a track
“Maastr.io is one of the best alternatives to human mastering that I’ve come across. The revisions and note collaboration are forward thinking.”
Beau BurchellSaosin, Chevelle, Underoath, Senses Fail, Hail the Sun, Boston Manor
“Intuitive. Dependable. Impressive. On demand. You can’t lose.”
Dan KorneffMy Chemical Romance, Pierce the Veil, Paramore, Motionless In White, A Day to Remember

Give your mix a final listen.

Master a track
No credit card required