M4Bindr

M4Bindr is an iOS app that converts multiple MP3 files into a single, professional .m4b audiobook directly on your iPhone.

Instead of using desktop tools or command-line scripts, M4Bindr lets you import your audio files, automatically organize them, add metadata and cover art, and export a fully chaptered audiobook ready for players like Apple Books.

All processing happens entirely on-device, so your files stay private and conversions are fast with no cloud uploads required.

Perfect for audiobook listeners who want a simple way to turn DRM-free MP3 collections into properly formatted audiobooks.