ChapterForge
Create, merge, and clean up chapter-based M4B audiobooks on Mac and Windows.
ChapterForge is a native audiobook workshop for turning loose audio files into clean, chapter-based M4B audiobooks.
Import a folder of MP3 files, review your chapters, edit metadata, and export a polished M4B with embedded artwork and audiobook-friendly metadata. ChapterForge keeps everything local on your machine — no uploads, no accounts, no cloud processing.
ChapterForge also includes a lossless M4B merge workflow on both Mac and Windows. Combine two or more existing M4B audiobooks into one continuous file without re-encoding the source audio, preserve chapters from every source, and export a single finished book.
For larger libraries, ChapterForge includes batch queueing, saved projects, Smart Auto Import on Windows, and watch folder workflows on Mac so you can scan, monitor, prepare, and process more than one audiobook without starting from scratch every time.
Screenshots
See it in action
Features
Smart Auto Import
Available on Windows and Mac. Scan audiobook folders in bulk instead of importing one project at a time, automatically load detected books as projects, and feed repeat work into your queue faster.
Watch Folders & Automatic Intake
Available on Mac. Watch folders can monitor intake locations, detect audiobook candidates, surface review and history activity, and route accepted work into your conversion workflow.
Lossless M4B Merge
New in version 1.1 (Mac) and 1.0.13 (Windows). Access from File → Merge M4B Audiobooks… or ⌘⇧M on Mac, and from the sidebar on Windows. Combine any number of existing M4B files without re-encoding a single byte, preserve chapters from every source, and export one seamless merged audiobook.
MP3 Folder to M4B Audiobook
Convert folders of MP3 files into chapter-based M4B audiobooks with embedded metadata, cover art, and configurable output quality.
Metadata Cleanup & Bulk Editing
Automatically extract chapter titles, artwork, and track metadata from source files, then edit title, author, narrator, publisher, language, ISBN, genre, and more. Apply changes across selected or all chapters in one pass.
Chapter Cleanup Tools
Reorder chapters, auto-number titles, add prefixes or suffixes across multiple selections, and run find-and-replace to clean up chapter names faster.
Find & Replace for Merge Chapters
Mac onlyWhen merging M4B files on Mac, rename chapter titles across the merged project with fast find-and-replace tools, including case-sensitive matching and pre-apply review.
Batch Queue & Priority Control
Queue multiple audiobook jobs, assign priority levels, and let ChapterForge process them automatically while you keep working on other projects.
Cover Art That Carries Through
Use embedded or folder-based artwork from your source files and carry it into the finished M4B so your audiobooks look right in Apple Books and other players.
Project Management
Save your work as projects and return to them later. ChapterForge remembers your metadata edits, chapter order, output settings, and folder locations exactly as you left them.
100% Local Processing
Your files stay on your machine. ChapterForge does not upload audio, require an account, or depend on a cloud conversion service.
System Requirements
macOS
macOS 12.0 or later
Windows
Windows 10 or later
User Reviews
See what users love about ChapterForge
2 reviews
4-Star Review
“”
Anonymous
Oct 11, 2025
5-Star Review
Elegant
“Intuitive interface, easy to use and very responsive developer.”
COSSnowbiker
Mar 9, 2026
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