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Free online MOBI to M4A converter

Convert MOBI ebook text into synthesized AAC narration in an M4A file.

Convert MOBI to M4A online - free

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How it works

  1. 1/3

    Upload your .mobi file

    Click to browse to select your file you want to convert or simply drag & drop your file into selected area.

  2. 2/3

    Perform .mobi to .m4a conversion

    After successful file upload, click to convert when you are ready.

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    Download converted .m4a file

    Conversion result is ready to download.

How to convert mobi to m4a file

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MOBI files contain ebook text, while some audio players and editing workflows require M4A files. Converting one to the other means generating spoken narration from the text and saving that audio as M4A.

What the MOBI format is

MOBI is an ebook format used for digital books, especially older Kindle titles and books from the Mobipocket era. You may encounter it in ebook libraries or files exported with tools such as Calibre; publishing tools such as KindleGen have also created MOBI books. MOBI stores text and book structure, not a recorded reading.

What the M4A format is

M4A is an audio file extension commonly used for audio encoded with AAC, and sometimes Apple Lossless (ALAC). AAC M4A files are supported by many phones, media players, and editing programs and are typically smaller than uncompressed audio. For a MOBI file, the result is synthesized narration rather than recovered audio.

How to convert MOBI to M4A

Online on 101convert.com

  1. Upload the MOBI file on the converter page. Multiple files can be added for batch conversion; the page shows the per-file size limit.
  2. Choose the voice language and reading speed before converting.
  3. Start the conversion, then download the resulting M4A file.

Offline with desktop software

For a local workflow, use the free Calibre, eSpeak NG, and FFmpeg tools. Calibre extracts the ebook text; eSpeak NG synthesizes speech; FFmpeg encodes it as M4A. Calibre and FFmpeg run on Windows, macOS, and Linux, and eSpeak NG is available for those desktop systems.

  1. Install the three tools, then convert the ebook to plain text with Calibre’s command-line utility: ebook-convert book.mobi book.txt.
  2. Generate a WAV narration. Replace en-us with an installed eSpeak NG voice; -s 165 sets the speaking rate in words per minute: espeak-ng -v en-us -s 165 -f book.txt -w narration.wav.
  3. Encode the WAV as AAC in an M4A container: ffmpeg -i narration.wav -c:a aac -b:a 128k narration.m4a.

Quality and limitations

The voice, pronunciation, and pacing depend on the TTS engine and its language voice; the conversion does not preserve ebook formatting as audio cues. DRM-protected MOBI files may not convert. The WAV intermediate can require substantial disk space for a long book, so check available storage before synthesizing.

Note: This mobi to m4a conversion record is incomplete, must be verified, and may contain inaccuracies. Please vote below whether you found this information helpful or not.

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MOBI vs M4A: format comparison

How the MOBI and M4A formats compare on the properties that matter most for this conversion.

Comparison of the MOBI and M4A file formats
Property .MOBI Mobipocket eBook .M4A MPEG-4 Audio
Open standard No Yes
Compression Both Both
Typical file size Small Small
Opens in a web browser No Yes, natively
Further editing Limited Limited
Metadata support Basic Extensive
Plain-text readable No No
Best used for Publishing Music
Introduced 2000 2001
Developer Mobipocket SA (later Amazon for Kindle variants) MPEG (Moving Picture Experts Group) / ISO/IEC
MIME type application/x-mobipocket-ebook audio/mp4
Open MOBI file Open M4A file

Information about file extensions and file types is provided by File-Extensions.org

Frequently asked questions

Is the MOBI to M4A converter free?

Yes, converting MOBI to M4A on 101convert.com is completely free. No registration, email address or installation is required. If you need a higher file size limit or want to convert more files at once, see our plans.

How large can my MOBI file be?

You can upload MOBI files up to 10 MB and convert up to 3 files at once in a single batch. With a paid plan the limit is up to 1000 MB per file and 20 files at once, see our plans.

What happens to my uploaded files?

Files are processed automatically and deleted from our servers within a few minutes after conversion. We never view or share your files.

Do I need to install any software to convert MOBI to M4A?

No. The MOBI to M4A conversion runs entirely online in your browser and works on Windows, Mac, Linux, Android and iPhone.

Did the conversion fail?

In most cases, the cause is an incorrect file format. Please upload a valid MOBI file for this MOBI to M4A conversion. Occasionally, the issue may be on our side. We analyze recurring conversion failures and disable or fix the converter if we detect a defect.

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