Free AI Music Mastering
Master your songs, full albums, and audio tracks to professional broadcast quality. Works for vocals, instrumentals, full mixes — any genre. Unlimited and free, no signup, no watermarks.
Master a Full Album
Drop multiple tracks or pick a folder. We’ll master them all with the same settings so the album hangs together.
Drop your album’s tracks here, or click to choose files
WAV, MP3, FLAC, AIFF, OGG, M4A — any number of tracks
Master Anything With Audio
One tool for every kind of audio you make. Drop a file, pick a reference sound, get a finished master.
Songs & Singles
Master your latest single to compete with commercial releases on Spotify and Apple Music.
Full Albums
Drop a whole folder of tracks (or multi-select) and master the entire album in parallel with one click.
Vocals & Acapellas
Clean up isolated vocal stems, lead vocals, harmonies, or full vocal performances.
Instrumentals
Beats, instrumentals, demos, score cues — anything without vocals masters perfectly.
Any Genre
Pop, rock, hip-hop, R&B, electronic, EDM, jazz, classical, folk, ambient, cinematic.
Demos & Roughs
Get a polished, releasable-sounding mix from a rough bedroom-studio demo in minutes.
Live Recordings
Clean up and loudness-match live performances, concerts, or rehearsal recordings.
Remixes & Edits
Bring remixes and DJ edits up to commercial loudness before release.
How Music Mastering Works
Three steps to a release-ready master
01
Upload Your Track
Drop your song, instrumental, or full album mix. We support WAV, MP3, FLAC, AIFF, M4A.
02
Pick a Reference Sound
Choose from built-in music presets, or upload any commercial track you want yours to sound like.
03
Download Your Master
Get a broadcast-loud, true-peak-limited file ready for Spotify, Apple Music, YouTube, or distribution.
Tuned For Music, Not Voice
Our podcast pipeline is voice-tuned — high-pass at 40 Hz, mid-cut for mud, gentle de-essing. Those moves help spoken word but hurt music. The music chain is different:
Subsonic HPF only
Cuts below 25 Hz — preserves the full bass impact of kick drums, sub bass, and low synths.
No de-essing
Cymbals, hi-hats, and bright synths stay open and airy. No mid-cuts that scoop guitars or vocals.
Slow, gentle glue
A wide-band compressor with a slow attack — adds cohesion without squashing transients or dynamics.
Reference-matched EQ
Matchering analyzes your reference track's spectrum and matches your mix to it. Whatever you reference, your master moves toward.
True-peak limiting at -1 dBTP
Brick-wall ceiling that prevents inter-sample clipping on streaming platforms.
Loudness targets
Hit -14 LUFS for Spotify, -16 for Apple, or -12 for broadcast. Iterative gain converges within 0.3 dB of the target.
Free Music Mastering — Frequently Asked Questions
Is the music mastering really free?
Yes — unlimited free use for everyone, no signup, no credit card. 24-bit HQ exports are also free during the v3 launch promo. We pay for compute so musicians don't have to.
What audio formats can I upload?
WAV, MP3, FLAC, AIFF, OGG, and M4A. We recommend uploading the highest-quality version of your mix you have — bit depth and sample rate are preserved through to the output.
Can I master a whole album at once?
Yes — scroll down to the 'Master a Full Album' section on this page. Drop multiple files at once or pick an entire folder of tracks. We'll process them in parallel using the same reference, loudness target, and settings, so the album hangs together as a cohesive release. When everything finishes, hit 'Download all as ZIP' for a one-click bundle.
Can I use a commercial song as my reference?
Yes, locally — upload any well-mastered track as your reference. The output never contains any of the reference audio; only its spectral and loudness profile gets mapped onto your mix. Standard reference-mastering workflow.
What loudness should I target for Spotify?
Spotify normalizes to -14 LUFS integrated. Apple Music is -16 LUFS. YouTube Music is around -14. Pick 'Standard (-14 LUFS)' in advanced settings for a safe Spotify-ready master, or 'Loud (-12)' for a more aggressive sound that holds up on platforms without normalization.
How long does mastering a song take?
Most songs (3-5 min) finish in under a minute. Full-length tracks (up to an hour) take a few minutes. Cold-starts on the first request of the session can add 4-5 seconds.
Do you train AI on my music?
No. We don't train on uploads, we don't keep them past 24 hours (free tier), and the source code is open on GitHub so you can verify this yourself.
What's the difference between this and your podcast mastering tool?
Same upload/download flow, different polish chain. The podcast version is voice-tuned (de-essing, presence boost around 2.8 kHz, mid cuts). The music version drops those moves so cymbals, bass, and guitars stay clean and full.