Same song. Flip the switch, peaks compress, the body lifts to streaming loudness, nothing clips.
Engineered for AI creators
60 sec
Upload to finished master. A studio takes days and $50 to 150 a song, this analyzes your frequency balance the moment it loads.
0
No account. No email. No credit card. No watermark. Not now, not ever.
Mastering runs in your browser, nothing is uploaded, so there's nothing for anyone to store, leak, or train on.
True ITU-R BS.1770 metering with a look-ahead true-peak limiter at −1 dBTP, the exact spec streaming platforms normalize to.
24-bit
Studio-grade WAV + 320 kbps MP3. Never a locked preview.
AI fizz is measured, then cut, only where it actually is. Flip Mix + Master and it separates your song into stems and rebalances the vocal before mastering.
Master too loud and the platform just turns it down. Pick where you're releasing, the engine hits that spec exactly.
−14
LUFS
Spotify
−16
LUFS
Apple Music
−14
LUFS
YouTube
−10
LUFS
TikTok
−14
LUFS
Tidal
−11
LUFS
SoundCloud
| Feature | MixMasterAI Free | Typical automated mastering |
|---|---|---|
| Account required | No sign-up | Email & password |
| Processing speed | Under 60 seconds | Several minutes + queue |
| File quality | 24-bit WAV / 320 kbps MP3 | Low-quality or locked preview |
| Watermarks | 100% watermark-free | Watermarked on free tiers |
| Where audio is processed | In your browser, never uploaded | Uploaded and stored on servers |
| Usage limits | Unlimited | Capped per month or per week |
This is free online mastering with no sign up: upload a track, and the engine measures K-weighted loudness (ITU-R BS.1770-4), applies genre-aware EQ, gentle glue compression, tape-style saturation and a look-ahead true-peak limiter, then hands back a 24-bit WAV and 320 kbps MP3. For AI mixing and mastering in one pass, the Mix + Master switch separates your song into stems and rebalances the vocal, drums and bass before mastering, or go deeper with the Suno stem mixer and Suno to MIDI. Every master passes the same QC a studio runs: true peak, phase, mono fold-down, final LUFS, loudness range and PLR.
Spotify normalizes to -14 LUFS integrated and recommends true peaks at or below -1 dBTP so the lossy encode doesn't clip. Louder masters get turned down, you gain nothing by smashing the limiter. This tool masters straight to that spec when you pick Spotify.
Match the platform: -14 LUFS for Spotify/YouTube/Tidal, -16 for Apple Music, louder (-9 to -11) for TikTok and Instagram where normalization is looser and punch wins. Pick the platform and the right target loads automatically.
Completely free, no account, no watermark, no daily limit. Compatible audio is processed locally in your browser and never uploaded to MixMasterAI.
Yes. AI songs are the most common upload here. The chain includes a de-harsh stage tuned for the high-frequency sheen AI generators leave on vocals and cymbals, plus the loudness and true-peak work every release needs.
No. There's no software to download and nothing to install, mastering happens online in your browser. The only download is your finished master (WAV + MP3). Searching for a 'free download' tool? This removes that step: upload, master, download the result.
Free. Private. Yours.