Frequently Asked Questions
How do I master a song online for free?
Upload an audio file, pick how loud you want it, and Solmi normalizes the overall loudness and applies a limiter so the track is louder and consistent without clipping. Preview it, then download — everything runs in your browser, nothing is uploaded.
Is this real mastering / AI mastering?
It's an automatic master — it normalizes loudness toward streaming levels and limits peaks. That covers the most common need (a louder, cleaner, more consistent track), but it isn't a human mastering engineer and it doesn't do detailed per-track EQ or stereo work. For a critical commercial release, a dedicated engineer still does it better.
Will my audio be uploaded anywhere?
No. The mastering runs entirely in your browser using the Web Audio API. Your file never leaves your device, so it stays private.
How loud should I master my song?
Streaming platforms normalize playback to around -14 LUFS, so mastering much hotter than that mostly just adds limiting without extra perceived loudness on streaming. Solmi targets a sensible streaming-style loudness by default; you can push it louder for non-streaming uses.
What audio formats are supported?
MP3, WAV, M4A, AAC, OGG, and FLAC — any format your browser can decode. The mastered track downloads as a WAV file.