Free online M4B to TTA converter

Source format

M4B is an AAC-based audio container commonly used for audiobooks. It is closely related to M4A and is often associated with Apple Books, iTunes, and other media players that support chaptered or bookmarkable audio. M4B files may contain metadata, chapters, and playback position information, which makes them especially useful for long-form spoken content.

Target format

TTA stands for True Audio, a lossless audio format designed to compress audio without quality loss. It is used by listeners and archivists who want bit-perfect preservation of the original sound while reducing file size. TTA is less common than FLAC or ALAC, but it can be useful in workflows where lossless compression and simple decoding are important.

How to perform the conversion

The most practical way to convert M4B to TTA is with a desktop audio converter such as FFmpeg or a dedicated audio tool that supports both formats. Because M4B is usually lossy AAC, converting it to TTA will not improve audio quality; it only stores the existing audio in a lossless container. If you want to convert online, you can use the free converter on 101convert.com without installing any software.

Using FFmpeg:

1. Install FFmpeg on your computer.
2. Open a terminal or command prompt in the folder containing the file.
3. Run ffmpeg -i input.m4b output.tta.
4. Check the output file in your player or audio library.

Using a graphical converter:

1. Open the converter and add the .m4b file.
2. Choose TTA as the output format.
3. Adjust options if available, such as sample rate or channels, though most converters will keep the source settings.
4. Start the conversion and save the resulting .tta file.

If your audiobook has chapters or metadata, check whether the converter preserves them. Many audio tools convert only the audio stream and may discard audiobook-specific tags.

Notes on quality, compatibility, or limitations

The main limitation is that M4B is usually already compressed with AAC, so converting it to TTA creates a larger file than the source in many cases, with no gain in fidelity. This conversion is only useful if you specifically need the TTA format for compatibility or archival workflow reasons. Also, chapter markers, bookmarks, and cover art may not survive the conversion unless the tool explicitly supports them. Playback support for TTA is more limited than for common formats like MP3, AAC, or FLAC, so verify that your target player can open .tta files.