File Requirements
Supported Audio Formats
Section titled “Supported Audio Formats”| Format | Extensions |
|---|---|
| WAV | .wav |
| FLAC | .flac |
| MP3 | .mp3 |
| AAC | .aac, .m4a |
| OGG | .ogg |
| AIFF | .aif, .aiff |
File Size Limits
Section titled “File Size Limits”| Upload type | Maximum size |
|---|---|
| Track | 500MB |
| Stem | 200MB per stem, 12 stems max per track |
| Sample | 200MB per sample |
Cover Art
Section titled “Cover Art”- Formats: JPG, PNG, WebP
- Maximum size: 10MB
- Maximum dimensions: 3000x3000px
If you don’t upload cover art, FreeMix generates a unique placeholder image for your track.
Audio Processing
Section titled “Audio Processing”FreeMix processes every audio file through an analysis pipeline after upload:
- BPM detection — automatically determines the tempo
- Key detection — identifies the musical key
- Waveform generation — creates the visual waveform shown in the player
- Preview rendition — generates a version optimized for streaming playback
- Format validation — verifies the file is actually the format it claims to be
You can override the auto-detected BPM and key if they’re wrong.
FLAC Compression
Section titled “FLAC Compression”Large WAV and AIFF files (over 5MB) are automatically compressed to FLAC before uploading. FLAC is a lossless format — your audio quality is identical to the original, but the file is significantly smaller (often 60–70% smaller). This dramatically reduces upload time.
For example, a 920MB WAV file might compress to 262MB as FLAC — same audio quality, much faster upload.
The compression happens in your browser before the file is sent. You don’t need to do anything — it’s automatic and transparent.
Storage
Section titled “Storage”During alpha, each account has a 10GB storage allowance. Higher tiers will be available in the future.