Master
Punch & Body
Optional character processing. Uses a clean chain; other suite effects are bypassed while enabled. Applies to the batch.
Compare A/B with level matching enabled. Start with Fuller. Body adds midrange density and filtered bass harmonics. Deep is stronger; compare before exporting.
SUNO POLISH is ready by default. No added air or widening. Peak protection may keep dynamic tracks below target. True peak uses a 4× estimate with safety headroom. A/B matches measured loudness; downloads retain the mastered level. Click tracks in the list to select them — SAVE SUITE → SELECTED gives just those songs their own settings.
Open a track’s report to see measured changes. Preview at matched loudness to judge tone and punch; download volume is unchanged.
Loudness without losing the music.
Master audio on your device and export 24-bit WAVs. Add one track or a whole album; your audio stays in your browser.
Streaming services adjust playback loudness. A louder file may simply be turned down; clipping remains. Aim for clean peaks and a balance that suits the music.
WHAT IT MASTERS TO
| PLATFORM | INTEGRATED LOUDNESS | TRUE PEAK CEILING |
|---|---|---|
| Spotify / YouTube | −14 LUFS | −1.0 dBTP |
| Apple Music | −16 LUFS | −1.0 dBTP |
| Custom | your call | your call |
Integrated LUFS is measured across the whole song, the same way the platforms measure it. The true-peak ceiling matters because lossy encoding (your WAV becoming a stream) can push peaks over 0 even when the file itself never touched it.
AI TRACKS NEED FIXING, NOT JUST LOUDENING
Use the repair suite to reduce harshness, fizz, mud and rumble, or adjust dynamics and stereo width. Start gently and compare at matched loudness.
L1 adjusts loudness. L2 analyses the track and suggests repairs. L3 uses a reference track to guide tonal balance. Review and change any setting.
ALBUM MODE
Process an EP or album to a shared loudness target. Download a ZIP with numbered tracks, cover art and lyric sheets. Paste lyrics or try local detection, then check the words.
HOW TO USE IT
- Drop your tracks anywhere on the page (on your phone, tap the green bar).
- Pick a platform — Spotify / YouTube is the safe default.
- Press L2 on a track and let it set itself up — or twist the knobs yourself.
- A/B it. The comparison is level-matched, so you're judging the sound, not the loudness.
- Master and download — one track, or the whole album as a ZIP.
FAQ
IS MY AUDIO UPLOADED ANYWHERE?
Audio processing runs on your device. Fonts, advertising and optional model downloads can still make network requests.
WHY DOES SPOTIFY TURN MY SONG DOWN?
Streaming loudness depends on the service and playback settings. Increasing the file’s loudness does not guarantee louder playback.
WILL THIS MAKE MY QUIET TRACK LOUDER?
It'll bring the track up to the platform target while protecting the peaks and the dynamics. If a song is very dynamic, the limiter will stop short rather than squash it — and the track panel tells you exactly what happened either way.
WHAT COMES OUT AT THE END?
24-bit WAVs at your original sample rate — exactly what DistroKid, TuneCore and the rest of them want. If you fed it an MP3, the output still started life as an MP3; mastering can't un-bake that. It can still fix the level and the fizz, though.
WHAT ARE L1, L2 AND L3?
Three levels of automation per track. L1 is loudness only. L2 scans the audio and sets the repair suite itself, telling you what it found. L3 matches your track to the tonal balance of a reference song you pick. Switch any of it off whenever you like — every setting stays yours to override.
WHAT DOES IT COST?
Nothing. It's free. The ads and the odd affiliate link on this page keep it that way, plus paid Song Spotlight spots for artists.