Bulk MP1 to M4B Converter Online — Free HD Quality
Drag and drop your multiple MP1 files into this free online MP1 to M4B converter (.mp1 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 MP1 files are removed from our servers right after.
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PNG, JPG, WebP, GIF, HEIC, RAW, PSD, SVG and more
Max 100MB per file
MP1 vs M4B — File Format Comparison
| Feature | MP1 | M4B |
|---|---|---|
| File Extension | .mp1 | .m4b |
| MIME Type | audio/mpeg | audio/mp4 |
| Compression Type | Lossy | Lossy |
| Metadata Support | No | Yes |
What Is MP1 Format?
MPEG-1 Audio Layer 1 — the earliest MPEG audio codec, used in Video CD and some legacy broadcast equipment; superseded by MP2 and MP3 and encountered only in archival digital video content.
- Compression: Lossy
- Tags & Metadata: Not 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
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