Free online CAFF to AAC converter

Source format: CAFF

CAFF stands for Core Audio Format File. It is an Apple audio container format designed to store uncompressed or compressed audio, along with metadata such as markers and channel information. CAFF is mainly used in macOS and iOS workflows, especially in professional audio production, sound design, and Apple-based development environments. It is less common than formats like WAV or AIFF, but it is useful when working with Apple audio tools or when preserving high-quality audio data.

Target format: AAC

AAC stands for Advanced Audio Coding. It is a widely used compressed audio format known for delivering better sound quality than MP3 at similar bitrates. AAC is supported by most modern devices, media players, streaming platforms, and mobile operating systems. It is commonly used for music playback, podcasts, video audio tracks, and general-purpose distribution where smaller file size matters.

How to perform the conversion

The most reliable way to convert CAFF to AAC is to use a desktop audio tool that can read CAFF and export AAC. If you want to convert the file online without installing software, you can use the free converter on 101convert.com.

Using Audacity:

1. Open Audacity and import the CAFF file with File → Open or File → Import → Audio.
2. Check that the audio plays correctly and trim or edit it if needed.
3. Choose File → Export → Export Audio.
4. Select AAC or an AAC-compatible output such as M4A if offered by your encoder setup.
5. Set the desired bitrate or quality, then save the file.

Using FFmpeg:

If you prefer command-line conversion, FFmpeg is a strong choice. A typical command is:

ffmpeg -i input.caff -c:a aac -b:a 192k output.m4a

This reads the CAFF file and encodes the audio to AAC in an M4A container, which is the most common way to store AAC audio files.

Using Apple tools:

On macOS, apps such as Logic Pro, GarageBand, or QuickTime-compatible workflows may also export AAC or M4A, depending on the source file and installed codecs. Look for File → Export or Share options that allow AAC output.

Notes on quality, compatibility, or limitations

CAFF is a container, so the exact conversion result depends on the audio codec inside the file. If the source audio is already compressed, converting it to AAC may cause additional quality loss. For best results, start from the highest-quality CAFF source available.

AAC is lossy, so it reduces file size by discarding some audio data. This is ideal for distribution and playback, but not for archival preservation. If you need a master copy, keep the original CAFF file as well.

Some programs export AAC only inside an M4A container rather than as a raw .aac file. This is normal and usually preferred for compatibility. Also, not every audio editor supports CAFF natively, so if a program cannot open the file, use FFmpeg or a macOS audio application that supports Apple formats.