The short answer
Add the chapters, check their order, choose your output and click Merge audio. Audio Convert Merge Free creates a combined file; your original chapter files remain available.
Example: three chapter files, one audiobook
- Chapter 01.mp3
- Chapter 02.mp3
- Chapter 03.mp3
Add the chapters for one audiobook
Open Audio Convert Merge Free and choose Add files or Add folder. Start with the chapters for one book so that a second title or duplicate download does not get mixed into the queue.
Use ordinary audio files that you can open and play. A protected audiobook download is not made accessible by renaming its extension; this app does not remove DRM.
Put Chapter 01 before Chapter 02
Review the numbered queue from top to bottom. Select a chapter and use Move up or Move down to put it in playback order. Filenames such as Chapter 1, Chapter 10 and Chapter 2 can sort unexpectedly, so check the actual list rather than trusting the folder view.
Use Preview when a filename does not make the sequence clear. Remove removes an unwanted entry from the queue. If you need to return to the arrangement later, use Save project; a project is separate from the final playable audio file.
Choose a direct join or a pause
In the Merge settings, open Between clips. For an audiobook, start with one of these options:
| Option | What it does | Use it when |
|---|---|---|
| Direct join | Adds no deliberate silence or crossfade. | The chapter files already contain appropriate pauses. |
| Silent gap | Adds the chosen Gap (seconds) between files. | You want a consistent extra pause at each chapter boundary. |
| Crossfade | Overlaps the end and beginning of adjacent clips. | You deliberately want an overlap, usually for music rather than narration. |
A direct join does not remove silence already inside the source chapters. Preview the boundary before trimming a pause: removing too much can cut off the narrator’s first or last word.
Choose an output format and processing mode
Select Output format. MP3 is a practical choice when your listening app accepts MP3; WAV uses much more space, and FLAC is useful when your workflow needs lossless output. Check your player’s supported formats before merging a long book.
Smart (recommended) uses a compatible copy path when possible and conversion when needed. Lossless copy requires matching technical properties and no edits or processing that force re-encoding. Use Studio merge when you want to rebuild the audio for trims, transitions or enhancements.
For chapters with different sample rates or channels, choose a common output in Sample rate and Channels and let Smart or Studio processing handle the conversion. A higher bitrate or sample rate cannot restore detail missing from a low-quality source.
Merge, then check the chapter boundaries
Use Browse in the output area to choose a new destination and filename. Keep it separate from the input chapters, then click Merge audio. Use Cancel if you need to stop and change the queue.
Play the beginning, the end and several chapter joins in your intended player. With Direct join, the duration should be close to the sum of the included clips; deliberately added gaps increase it and crossfades reduce it. Check the narration order before moving or deleting any originals.
Will the merged audiobook have chapter markers?
The main result is one continuous audio file. The Create a CUE chapter sheet option can save a separate chapter-position file for compatible players; it does not mean every player will show embedded audiobook chapters. Keep the CUE beside the audio if your player uses it.
If your main goal is joining music instead, see how to join MP3 music. For recordings with mixed formats or unwanted sections, use the audio merging and trimming guide.
Questions before you start
Can I join chapters with different sample rates?
Use Smart or Studio processing and choose common output settings. Matching the sample rate and channels can require resampling and re-encoding; it is not always a lossless copy.
Why is there still a pause with Direct join?
Direct join adds no deliberate silence, but silence already at a source file’s beginning or ending remains. Preview and trim the relevant source if you need to change it.
Can I return to individual chapters?
Keep the original chapter files. A project saves your arrangement, while the main merged output is a continuous audio file. A separate CUE sheet requires player support.
Download the free app
Audio Convert Merge Free is free for its supported features. No subscription or paid activation is required.
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