Free online DFF to ALAC converter

Source format: DFF

DFF is a DSD audio container format, most commonly associated with DSDIFF files used for high-resolution music. It is used by audiophiles, music archivists, and some mastering workflows to store one-bit audio data with very high sample rates. DFF files are often found in SACD-related rips, studio archives, and collections where preserving the original DSD signal is important.

Target format: ALAC

ALAC stands for Apple Lossless Audio Codec. It is a lossless compressed audio format designed to preserve the full quality of the source while reducing file size. ALAC is widely supported by Apple devices and software, and it is also playable in many modern media players and libraries. It is a good choice when you want lossless playback with broad compatibility in the Apple ecosystem.

How to convert DFF to ALAC

The most reliable way to convert DFF to ALAC is with a desktop audio converter that can read DSD/DFF files and export to lossless PCM-based formats. A practical option is foobar2000 with the appropriate components, or FFmpeg for command-line conversion when the source file is supported.

Method 1: using foobar2000

1. Install foobar2000 and make sure it can open DFF files.
2. Add the .dff file to the playlist or library.
3. Select the file, then choose File → Convert → ....
4. Pick an output format that supports ALAC or use a converter preset that writes M4A/ALAC.
5. Choose the destination folder and start the conversion.

Method 2: using FFmpeg

1. Install FFmpeg.
2. Run a command similar to ffmpeg -i input.dff -c:a alac output.m4a.
3. Wait for the conversion to finish, then test the resulting file in a compatible player.

If you prefer a simple browser-based workflow, you can convert the file on 101convert.com for free, without installing any software.

Quality, compatibility, and limitations

DFF to ALAC is not a bit-perfect DSD transfer. ALAC stores PCM audio, so the DSD source must be decoded and usually converted to PCM during export. That means the result is still lossless relative to the PCM output, but it is not the same native DSD data as the original DFF file.

For best results, use a converter that lets you control sample rate, bit depth, and any noise shaping or filtering options. Very high DSD sample rates can produce large PCM outputs, so the converted ALAC file may still be sizable. Also note that some players handle ALAC in .m4a containers more reliably than in other wrappers, so output.m4a is usually the safest choice.