Free online AAC to TTA converter

1. Source format: AAC

AAC (Advanced Audio Coding) is a widely used compressed audio format designed to deliver good sound quality at relatively low bitrates. It is commonly used by Apple devices and software, streaming services, mobile phones, and media players. AAC files are often found as .aac or inside containers such as .m4a. Typical uses include music playback, podcasts, and online audio distribution.

2. Target format: TTA

TTA (True Audio) is a lossless audio format. Unlike AAC, which is lossy, TTA preserves the original audio data while compressing it efficiently. It is used by audio enthusiasts and in archival or high-quality playback workflows where preserving exact audio fidelity matters. Its main advantages are lossless compression, small file sizes compared with uncompressed audio, and support in some media players and audio tools.

3. How to perform the conversion

The most practical way to convert AAC to TTA is with a desktop audio converter that supports both formats. A good option is FFmpeg, which is free, widely available, and works on Windows, macOS, and Linux. You can also convert the file on 101convert.com for free, without installing any software.

Important: because AAC is lossy and TTA is lossless, the conversion cannot restore audio detail that was already discarded in the AAC file. The result will be a TTA file, but its quality will still be limited by the original AAC source.

Using FFmpeg from the command line:

1. Install FFmpeg if it is not already on your system.
2. Open a terminal or command prompt in the folder containing your AAC file.
3. Run a command such as ffmpeg -i input.aac output.tta.
4. Wait for the conversion to finish, then open output.tta in a compatible player to verify it.

If your AAC file is inside an .m4a container, the same approach usually works: ffmpeg -i input.m4a output.tta.

Using a graphical converter:

1. Open your audio converter and import the AAC file.
2. Choose TTA as the output format.
3. Adjust settings if needed, such as sample rate or channels, though keeping the source settings is usually best.
4. Start the conversion and save the resulting file.

4. Notes on quality, compatibility, or limitations

Quality limitation: converting from AAC to TTA does not improve audio quality. Since AAC is already compressed with loss, the TTA file will simply store that lossy audio in a lossless container.

Compatibility: TTA is less universally supported than AAC. Many phones, browsers, and mainstream media apps play AAC easily, while TTA may require specialized software or plugins.

File size: the resulting TTA file may be larger than the AAC source, because lossless formats typically need more space than lossy ones.

Best use case: convert AAC to TTA only if you specifically need the TTA format for compatibility with a particular player, archive workflow, or audio library. If your goal is smaller size and broad playback support, keeping AAC is usually better.