Are your M4B audiobooks locked to one app? Audiobook Converter Pro breaks that lock \u2014 convert any M4B to MP3, AAC, or FLAC and listen anywhere, the way you want.\n\nWhy it works for serious listeners\n\nMost M4B converters either destroy your chapter structure, strip your cover art, or crawl through a 20-hour book one chapter at a time. Audiobook Converter Pro was built to avoid all three \u2014 with high-speed parallel conversion, metadata preservation, and intelligent chapter handling for both modern and older audiobooks.\n\nKey Features\n\n\u26a1 Parallel Processing \u2014 Convert 8 Files and 4 Chapters at Once\nSet your own parallel limits. Convert a whole shelf of audiobooks while you sleep. Up to 8 M4B files running simultaneously, each splitting up to 4 chapters in parallel.\n\n\U0001f9e0 NEW: Intelligent Chapter Detection for Markerless Audiobooks\nSome audiobooks do not contain embedded chapter markers. Audiobook Converter Pro can now analyze long pauses and intelligently infer chapter breaks automatically.\n\nChoose between:\n\n* Silence-Based Chapter Detection for chapter splitting\n* Fast Single-File Conversion for quicker processing\n\nThe app includes:\n\n* Live scan progress\n* Confidence guidance\n* Adjustable pause detection sensitivity\n* Fast Adaptive Scan mode\n* Maximum Accuracy Scan mode\n\n\U0001f4d6 Chapter-by-Chapter, File-by-File\nEvery chapter becomes a properly named, individually navigable file. Or choose Single File mode to merge the entire book into one continuous track. Your preference, saved.\n\n\U0001f48e Smart Quality \u2014 Including Lossless Passthrough\nChoose from 128kbps through 320kbps MP3, AAC, or lossless FLAC. If your source M4B is already high-quality AAC, the app detects it automatically and copies the audio stream without re-encoding \u2014 zero quality loss and dramatically faster conversion.\n\n\U0001f50d Bitrate Transparency\nSee exactly what the app is doing during conversion with labels such as:\n\n* \u201cTranscoding (128 \u2192 192 kbps)\u201d\n* \u201cAAC Passthrough \u2014 no re-encode needed\u201d\n\n\U0001f3a8 Cover Art Preserved Automatically\nYour audiobook artwork is extracted from the M4B and re-embedded into every output file. Your media library keeps its covers.\n\n\U0001f5bc\ufe0f Redesigned Queue & Sidebar Experience\nThe refreshed interface now displays:\n\n* Full album artwork for single-file conversions\n* Multi-cover grid previews for batch conversions\n* Improved conversion stats in a clean colour-coded layout\n\n\u2702\ufe0f File Naming Templates\nOrganise your library exactly how you want. Use token-based templates like:\n{Album}/{TrackPadded} - {ChapterTitle}\n\nAvailable tokens:\n{Album}, {Artist}, {ChapterTitle}, {TrackNumber}, {TrackPadded}, {TotalTracks}\n\n\U0001f4c1 Recursive Folder Scanning\nDrop a folder \u2014 not individual files. The app scans recursively and queues every M4B it finds.\n\n\U0001f440 NEW: Watch Folder Automation\nAutomatically monitor folders for incoming audiobooks.\n\nModes include:\n\n* Queue Only\n* Auto Convert\n\nPerformance profiles:\n\n* Safe\n* Balanced\n* Fast\n\nPerfect for automatically processing newly downloaded audiobooks.\n\n\U0001f514 Completion Notifications\nGet a Windows notification the moment your batch finishes. Click it to open the output folder directly.\n\n\U0001f4cb Conversion History & Recovery\nA full history panel shows every past batch \u2014 status, files, outcome, and recovery state. Reveal outputs in File Explorer with one click.\n\nIf a session is interrupted, the recovery system helps resume unfinished work.\n\n\U0001f4c8 Improved Progress Tracking\nParallel conversions now display chapter progress more reliably, including better handling for single-file workflows and converted chapter visibility.\n\n\u2728 Drag-and-Drop, Then Done\nDrop your files, pick your format, convert. Every setting has a sensible default. Advanced options are there when you need them, out of the way when you don't.\n\n\U0001f3a8 Dark & Light Themes\nA focused, retro-accented interface with full dark and light mode support.\n\n\u2b50 Built for Microsoft Store Users\nThis release also improves Microsoft Store reliability and behavior:\n\n* Improved Store build startup reliability\n\n\nReliability Improvements\n\n* Fixed crashes during long conversions when the window was minimized or the screen locked\n* Fixed FLAC conversion failures on certain audiobook files\n* Improved recovery reliability during large batch conversions\n* More stable parallel conversion behavior\n\nWhat you get\n\n* Convert M4B \u2192 MP3, AAC, or FLAC\n* Bitrates: 128 / 192 / 256 / 320kbps or lossless FLAC\n* Split by chapters or merge into a single file\n* Silence-based chapter detection for markerless audiobooks\n* Configurable pause-detection sensitivity\n* Fast Adaptive and Maximum Accuracy scan modes\n* Live scan progress and confidence guidance\n* Configurable parallel file conversions (up to 8)\n* Configurable parallel chapter conversions (up to 4 per file)\n* Watch Folder automation\n* Queue Only and Auto Convert modes\n* Recursive folder scan\n* File naming templates with metadata tokens\n* Cover art extraction and re-embedding\n* Metadata preservation: title, author, album, chapters\n* Custom output folder\n* Conversion history with File Explorer reveal\n* Batch recovery support\n* Windows completion notifications\n