ChapterForge
MP3 to M4B audiobook converter
Only for Mac
Free · In‑App Purchases
Mac
Convert up to 3 chapters or merge up to 3 M4B files free, then scale up with queueing, Smart Auto-Import, and watch-folder automation.
Turn audiobook files into polished, chapter-based M4B releases with a Mac workflow built for control, cleanup, and less manual work.
ChapterForge helps audiobook collectors, authors, narrators, producers, and Mac power users convert, merge, organize, and automate audiobook workflows without command-line tools.
CONVERT MP3 FOLDERS TO M4B
Import MP3 chapters and ChapterForge creates a project from your source files. It reads metadata, detects track order, finds folder or embedded artwork, and prepares chapters for review. Reorder chapters, edit titles, update book metadata, then export a finished M4B with chapter markers and cover art.
MERGE EXISTING M4B FILES
Combine multipart or split M4B audiobooks into one continuous file without re-encoding the audio. ChapterForge extracts embedded chapters, rebuilds the timeline, lets you rename chapters or use Find & Replace, and carries cover art into the final release.
SMART AUTO-IMPORT
Scan larger audiobook collections, group files by metadata and folder structure, detect multipart albums, find artwork, and review results before creating projects in bulk. Live percentage progress shows file discovery and metadata-reading activity throughout longer scans.
WATCH FOLDERS
Monitor folders for new audiobook drops, review detected items, track duplicates and history, and choose whether ChapterForge should create projects, add jobs to the queue, or begin conversion automatically.
CUSTOM OUTPUT TEMPLATES
Control how finished audiobooks are organized and named under your Master Output folder.
Build reusable folder and filename templates with:
{title} {album} {author} {authorSort} {narrator} {genre} {year}
Example folder:
{authorSort}/{year}/{title}
Example filename:
{title} - {narrator}
A live preview shows the resolved output path before conversion. The same templates work across MP3 conversion, M4B merging, batch jobs, and watch-folder automation.
Publication Year can be read from source metadata or entered manually. Conflicting source years are flagged for review. Empty Album falls back to Title, empty Author Sort falls back to Author, and missing Year uses “Unknown Year.”
Playback Speed Conversion
You can now bake a faster (or slower) listening speed right into your audiobook. Turn on "Adjust playback speed" in Output Settings and pick anything from 0.5x to 3.0x — ChapterForge re-encodes the audio at that tempo with the pitch preserved, and shifts every chapter marker to match the new timeline. Great for permanently speeding up a slow narrator.
HIGHLIGHTS
• Convert MP3 folders into chapter-based M4B audiobooks
• Merge multiple M4B files without re-encoding
• Review, reorder, rename, and bulk-edit chapters
• Clean chapter names with Find & Replace
• Read metadata and artwork automatically
• Prefer folder cover images with embedded artwork fallback
• Create custom output folders and filenames from metadata
• Preview the final output path before conversion
• Scan larger libraries and create projects in bulk
• Monitor watch folders and automate incoming work
• Add jobs to a batch queue, track progress, and retry failures
• Open completed audiobooks in Books
• Save projects and return to them later
TRY CHAPTERFORGE FREE
Free mode lets you test real output using your own files:
• Convert up to 3 chapters in a single project
• Merge up to 3 M4B files
ChapterForge Pro unlocks full-length conversion, batch queueing, Smart Auto-Import, expanded metadata, larger merge jobs, and automated watch-folder actions.
BUILT FOR MACOS
ChapterForge combines a native macOS interface with an FFmpeg-powered conversion and merge pipeline, delivering a practical Mac app for serious audiobook workflows.
Perfect for collectors cleaning up local libraries, authors and narrators packaging releases, and producers combining multipart audiobooks.
Terms of Use:
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
- This app hasn’t received enough ratings or reviews to display an overview.
• New: Playback Speed conversion — permanently set 0.5x–3.0x with pitch
preserved and chapter markers auto-adjusted. Works for single, batch,
and watch-folder conversions.
• Missing or moved source files are now detected up front with a clear
message instead of failing mid-conversion.
• Fixed the queue speed badge showing a stale value during a running job.
• Books added to a running batch now start immediately when a slot is free.
• Updated in-app Help and various reliability fixes.
The developer, OKGONZ, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Anoop Menon
- Size
- 67.9 MB
- Category
- Productivity
- Compatibility
Requires macOS 12.0 or later.
- Mac
Requires macOS 12.0 or later.
- Mac
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Monthly Subscription $3.99
- FULL PRO Lifetime $44.99
- Yearly Subscription $24.99
- Copyright
- © Indie4Tune Software

