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M4Bindr

Skip the desktop tools. The only app you need to import, merge, and build professional M4B audiobooks directly on your iPhone.·m4bindr.com

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M4Bindr is an iOS app that converts and merges MP3, M4A, and M4B audio files into a single chapterized M4B audiobook. It processes everything on-device with no uploads, letting users add chapters, metadata (title, author, narrator, genre, year, description, copyright), and cover art. The finished file can be exported to Files, iCloud, or synced to Apple Books.

What it's for

Combine MP3 chapters (e.g. from Librivox) into a single audiobookConvert voice memos into audiobooks with chapters and cover artCreate professional audiobooks for Apple Books

Features 12

100% on-device/offline audio processing
Add custom cover art
Add metadata: title, author, narrator, genre, year, description, copyright
Chapter creation (each imported file becomes a chapter)
Convert MP3, M4A, and M4B files into M4B audiobooks
Export to Files, iCloud, or other apps
Family Sharing support
Merge multiple audio files into a single file
No account required
Pause and resume build process
Preserves original chapters when combining existing M4B files
Universal Purchase across iPhone and iPad

At a glance

free tier

TypeMobile app

DeploymentInstalled (local)

PlatformsiOS

Forcreators

Integrations

Apple BooksiCloudFiles

Pricing

Pro is a one-time purchase, not a monthly subscription. The listed price is $5.99.

FreeFree

Usable indefinitely with no account required, limited by audio length/chapter count

Up to 30 minutes of audio and 3 chapters; no time limit or trial period

ProQuote

One-time purchase, no subscription. Structured markup states $6.99; FAQ page text states $5.99 in two places — markup value used per source-priority rules.

Unlocks unlimited audiobook duration and exports