Bulk MIDI to M4B Converter Online — Free HD Quality
Drag and drop your multiple MIDI files into this 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 — your original MIDI files are removed from our servers right after.
Drop images here or click to browse
PNG, JPG, WebP, GIF, HEIC, RAW, PSD, SVG and more
Max 100MB per file
MIDI vs M4B — File Format Comparison
| 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
Related Converters
- Convert AIFF files to WebP in queue
- CAF to OGG converter - no registration
- Batch process DCR to PAM
- Convert DDS to ICO
- Bulk convert MEF to PBM
- MID to ANDROID converter
- Export MIDI as WMA
- Quick MP2 to AIFC online converter
- Free MP2 to WAV - no account needed
- Simple OGA to 3GA tool
- Convert ORF to PAM
- PPM to WBMP conversion tool online
- Bulk convert PSB to JPG
- Process multiple WAVE to RAS files
- Explore all MIDI conversions
- Convert other formats to M4B
- Explore Audio converters
- ConvertFlash converter tools