Bulk MIDI to M4B Converter Online — Free HD Quality
Drag and drop your multiple MIDI files into this 100% free online MIDI to M4B converter (.midi to .m4b), and click the Convert button to bulk convert them to M4B format in HD quality. Use the quality slider to fine-tune your M4B output, then download your converted files one by one or as a single ZIP — no signup and no downloads needed, and your original MIDI files are removed from our servers right after. Also see:Turn AIF into M4A.
Drop your MIDI files here to convert to M4B, or click to browse
Converts .midi to M4B (.m4b) in HD quality — bulk, free, no signup
Choose FilesMIDI vs M4B — File Format Comparison
See how MIDI and M4B compare across file extension, MIME type, compression, and feature support. Related:Bulk convert MIDI to AIFC.
| Feature | MIDI | M4B |
|---|---|---|
| File Extension | .midi | .m4b |
| MIME Type | audio/midi | audio/mp4 |
| Compression Type | Varies | Lossy |
| Metadata Support | Yes | Yes |
What Is MIDI Format?
MIDI File (long extension) — the .midi variant of the MIDI format carrying the same musical note-event data as .mid; synthesised to audio via fluidsynth with a General MIDI soundfont at 44100 Hz.
- Compression: Varies
- Tags & Metadata: Supported
What Is M4B Format?
MPEG-4 Audiobook — AAC audio in an MP4 container with bookmarking support, the standard format for audiobooks on Apple Books, Audible exports, and iPhone podcasts.
- Compression: Lossy
- Tags & Metadata: Supported