AudioBo

AudioBo turns audio files into real M4B audiobooks — with proper chapters, clean metadata, and reliable long-form playback.

MP3 files work well for music, but fall apart for audiobooks: no true chapter support, unreliable bookmarks, and inconsistent resume behavior. AudioBo builds real M4B audiobooks instead — the format designed specifically for long-form listening.

M4B supports chapters, bookmarks, and clean navigation in Apple Books, Music, CarPlay, and even classic iPods. AudioBo produces correctly structured M4B files — not repackaged audio that only looks like an audiobook.

WHO AUDIOBO IS FOR

For anyone who wants a proper M4B audiobook — without a PhD in terminal tools, codecs, or settings. AudioBo handles the technical choices for you, aiming for the best possible quality without unnecessary file size bloat.

WHAT MAKES AUDIOBO DIFFERENT

• No arbitrary limits Create audiobooks of any length — from short recordings to multi-hour projects — without forced splitting or awkward workarounds.

• No unnecessary re-encoding If you only change metadata or artwork, AudioBo preserves the original audio stream — no quality loss, no wasted processing.

• Correct M4B container & chapter standards AudioBo writes proper M4B files with full support for QuickTime and Nero chapter formats — a clean, standards-compliant container that behaves correctly everywhere, not fragile hacks that only look right.

• Batch chapter cleanup Clean up messy chapters in one go: normalize titles, fix ordering, remove junk entries, and make the chapter list consistent — without babysitting every book manually.

• Export beyond M4B (M4A & MP3 too) Need compatibility over “perfect audiobook”? Export to M4A or MP3 for locked-down DAP players, vintage car stereos, and other non-Apple setups.

• External chapters: CUE + simple chapter.txt Bring your own chapters via external files (CUE and more), or define them yourself using a plain chapter.txt with a simple YouTube-style timestamp format — fast, readable, and easy to edit.

TECHNICAL DETAILS (FOR THE CURIOUS)

AudioBo works with the formats people actually have. You can bring in MP3, AAC (M4A), OGG, WAV, WMA, WV, APE, FLAC, Opus, or AIFF.

Audio encoding options:

• M4B/M4A in AAC-LC/HE-AAC, MP3
• Mono or stereo, based on your source
• Bitrates from 16 to 320 kbps
• Sample rates from 22.05 up to 96 kHz

Compatibility:

• Plays natively on Apple Books, Music, iOS, macOS, and classic iPods
• Works smoothly with Plex, BookPlayer, VLC, Audiobookshelf, and most audiobook apps
• Fully supported on Android and Windows through any modern audio player
• Export directly to Apple Books with proper chapters, artwork, and metadata