Watch Folder works on Mac and Windows
If you convert one audiobook every few months, dragging a file into an app is no trouble. If new M4B files regularly arrive in the same folder, doing that over and over starts to feel like unnecessary admin.
That's where Watch Folder helps. Audiobook Converter Pro offers the same core Watch Folder choice on Mac and Windows: queue new M4B files for your review, or automatically start their conversion while the app is running. The Windows edition is not missing this feature.
You can get Audiobook Converter Pro for Mac on the Mac App Store or Audiobook Converter Pro for Windows on the Microsoft Store. The product page shows both editions together.
Choose how much you want to automate
Create a Watch Folder profile, point it at the folder where your M4B files arrive, and choose what should happen next:
- Queue Only discovers new files and adds them to the app's queue. You check the list and decide when to convert. This is useful when each book needs a quick look first.
- Auto Convert picks up eligible new files and starts conversion using the profile's settings while the app is running. This is useful when your incoming files follow a predictable pattern.
Both modes are available on Mac and Windows. You can choose an output format and destination for the workflow, and use different profiles when different intake folders need different treatment. Nothing is uploaded to a service: conversion happens on your computer.
For example, I might use Queue Only for a mixed folder of old audiobook rips. I want to glance at their chapter information before converting. For a folder that receives consistently prepared M4B files, Auto Convert saves me from repeating the same import and start steps each time.
What happens when a file arrives?
The app checks a newly detected M4B before processing it, so it doesn't treat a file that's still being copied as a finished audiobook. It also tracks work it has already handled to avoid blindly reprocessing the same arrival. Watch Folder only processes files it can access; if a watched location is moved or disconnected, check the profile's status and restore access before expecting new work to run.
Watch Folder is an app-running workflow, not a promise that a closed app will keep converting in the background. If a file arrives while the app is closed, open the app and review what it discovers before relying on Auto Convert. This is especially important for network drives and removable storage, which may not be available when you return.
The Mac and Windows difference is folder access, not the feature
On macOS, the sandboxed app uses saved folder permission state so a Watch Folder profile can regain access across launches. On Windows, the app watches a saved folder path and checks file-system access directly. Those are operating-system details; both editions provide Watch Folder profiles, Queue Only, and Auto Convert.
If a profile reports a problem, first check that the folder still exists and the drive is connected. On Mac, you may also need to grant access to the folder again. On Windows, check that the saved path and its permissions are still valid.
Know when to review a book yourself
Watch Folder is for incoming M4B files. It does not infer chapter boundaries from silence unattended. If an audiobook has no embedded chapter markers and you want to split it into chapters, open it interactively on either Mac or Windows and review the silence-based chapter inference before converting. In Watch Folder, markerless split work takes a more conservative review or single-file path rather than quietly inventing chapters.
This distinction matters more than the platform. Queue Only gives you the most control; Auto Convert saves the most time when the incoming books are already in good shape.
Availability on both stores
Watch Folder conversion and automation are part of the paid/Pro workflow on both platforms. On Mac, Full Pro unlocks Watch Folder conversion; the Mac edition also has a free tier for trying the basic conversion flow. The Microsoft Store edition is a paid Windows app with Watch Folder automation included. Check the current store listings for prices and licence terms.
If you'd like the whole conversion walkthrough, the Mac and Windows audiobook guide covers Watch Folder alongside chapter-preserving output and markerless books.
I built Watch Folder because the tenth import of the week felt just as repetitive as the first. The implementation differs where macOS and Windows handle folder access differently, but the useful part—less manual intake—is there on both.
